Merge branch 'real-hardware' into fb-driver

Since it's often needed when debugging between the bootloader and
kernel, log the address of the table pages the bootloader allocated.

assets/debugging/jsix.elf-gdb.py

@@ -16,10 +16,14 @@ class PrintStackCommand(gdb.Command):
             depth = int(args[1])
 
         for i in range(depth-1, -1, -1):
+            try:
                 offset = i * 8
                 base_addr = gdb.parse_and_eval(base)
                 value = gdb.parse_and_eval(f"*(uint64_t*)({base} + {offset})")
                 print("{:016x} (+{:04x}): {:016x}".format(int(base_addr) + offset, offset, int(value)))
+            except Exception as e:
+                print(e)
+                continue
 
 
 class PrintBacktraceCommand(gdb.Command):
@@ -29,13 +33,13 @@ class PrintBacktraceCommand(gdb.Command):
     def invoke(self, arg, from_tty):
         args = gdb.string_to_argv(arg)
 
-        frame = "$rbp"
-        if len(args) > 0:
-            frame = args[0]
-
         depth = 30
+        if len(args) > 0:
+            depth = int(args[0])
+
+        frame = "$rbp"
         if len(args) > 1:
-            depth = int(args[1])
+            frame = args[1]
 
         for i in range(depth-1, -1, -1):
             ret = gdb.parse_and_eval(f"*(uint64_t*)({frame} + 8)")

modules.yaml

@@ -6,6 +6,7 @@ modules:
         output: jsix.elf
         target: host
         deps:
+            - cpu
             - kutil
         includes:
             - src/kernel
@@ -20,7 +21,6 @@ modules:
             - src/kernel/debug.cpp
             - src/kernel/debug.s
             - src/kernel/device_manager.cpp
-            - src/kernel/font.cpp
             - src/kernel/frame_allocator.cpp
             - src/kernel/fs/gpt.cpp
             - src/kernel/gdt.cpp
@@ -44,7 +44,6 @@ modules:
             - src/kernel/page_table.cpp
             - src/kernel/pci.cpp
             - src/kernel/scheduler.cpp
-            - src/kernel/screen.cpp
             - src/kernel/serial.cpp
             - src/kernel/symbol_table.cpp
             - src/kernel/syscall.cpp
@@ -64,6 +63,8 @@ modules:
         kind: exe
         target: boot
         output: boot.efi
+        deps:
+            - cpu
         source:
             - src/boot/main.cpp
             - src/boot/console.cpp
@@ -73,6 +74,7 @@ modules:
             - src/boot/loader.cpp
             - src/boot/memory.cpp
             - src/boot/paging.cpp
+            - src/boot/status.cpp
             - src/boot/support.cpp
 
     nulldrv:
@@ -84,9 +86,20 @@ modules:
         source:
             - src/drivers/nulldrv/io.cpp
             - src/drivers/nulldrv/main.cpp
-            - src/drivers/nulldrv/main.s
             - src/drivers/nulldrv/serial.cpp
 
+    fb:
+        kind: exe
+        target: user
+        output: fb.elf
+        deps:
+          - libc
+        source:
+            - src/drivers/fb/font.cpp
+            - src/drivers/fb/main.cpp
+            - src/drivers/fb/screen.cpp
+            - src/drivers/fb/scrollback.cpp
+
     kutil:
         kind: lib
         output: libkutil.a
@@ -100,6 +113,14 @@ modules:
             - src/libraries/kutil/memory.cpp
             - src/libraries/kutil/printf.c
 
+    cpu:
+        kind: lib
+        output: libcpu.a
+        includes:
+            - src/libraries/cpu/include
+        source:
+            - src/libraries/cpu/cpu.cpp
+
 
     libc:
         kind: lib
@@ -122,6 +143,8 @@ modules:
               #- LACKS_TIME_H
         source:
             - src/libraries/libc/arch/x86_64/_Exit.s
+            - src/libraries/libc/arch/x86_64/crt0.s
+            - src/libraries/libc/arch/x86_64/init_libc.c
             - src/libraries/libc/arch/x86_64/syscalls.s
             - src/libraries/libc/ctype/isalnum.c
             - src/libraries/libc/ctype/isalpha.c

qemu.sh

@@ -6,6 +6,7 @@ debug=""
 debugtarget="${build}/jsix.elf"
 flash_name="ovmf_vars"
 gfx="-nographic"
+vga="-vga none"
 kvm=""
 cpu="Broadwell,+pdpe1gb"
 
@@ -22,6 +23,10 @@ for arg in $@; do
 			;;
 		--gfx)
 			gfx=""
+			vga=""
+			;;
+		--vga)
+			vga=""
 			;;
 		--kvm)
 			kvm="-enable-kvm"
@@ -72,4 +77,4 @@ exec qemu-system-x86_64 \
 	-cpu "${cpu}" \
 	-M q35 \
 	-no-reboot \
-	$gfx $kvm $debug
+	$gfx $vga $kvm $debug

scripts/build_symbol_table.py

@@ -19,15 +19,19 @@ def parse_syms(infile):
     representing the symbols in the text segment of the binary. Returns
     a list of (address, symbol_name)."""
 
-    from cxxfilt import demangle
+    from cxxfilt import demangle, InvalidName
 
     syms = []
     for line in sys.stdin:
         addr, t, mangled = line.split()
         if t not in "tTvVwW": continue
 
-        addr = int(addr, base=16)
+        try:
             name = demangle(mangled)
+        except InvalidName:
+            continue
+
+        addr = int(addr, base=16)
         syms.append((addr, name))
 
     return sorted(syms)

scripts/fontpsf.py

@@ -0,0 +1,75 @@
+_MAGIC = (0x72, 0xb5, 0x4a, 0x86)
+_VERSION = 0
+
+class PSF2:
+    from collections import namedtuple
+    Header = namedtuple("PSF2Header",
+        ["version", "offset", "flags", "count", "charsize", "height", "width"])
+
+    def __init__(self, filename, header, data):
+        self.__filename = filename
+        self.__header = header
+        self.__data = data
+
+    data = property(lambda self: self.__data)
+    header = property(lambda self: self.__header)
+    count = property(lambda self: self.__header.count)
+    charsize = property(lambda self: self.__header.charsize)
+    dimension = property(lambda self: (self.__header.width, self.__header.height))
+    filename = property(lambda self: self.__filename)
+
+    @classmethod
+    def load(cls, filename):
+        from os.path import basename
+        from struct import unpack_from
+
+        data = open(filename, 'rb').read()
+
+        fmt = "BBBBIIIIIII"
+        values = unpack_from(fmt, data)
+
+        if values[:len(_MAGIC)] != _MAGIC:
+            raise Exception("Bad magic number in header")
+
+        header = PSF2.Header(*values[len(_MAGIC):])
+        if header.version != _VERSION:
+            raise Exception(f"Bad version {header.version} in header")
+
+        return cls(basename(filename), header, data)
+
+    class Glyph:
+        __slots__ = ['index', 'data']
+        def __init__(self, i, data):
+            self.index = i
+            self.data = data
+        def __index__(self):
+            return self.index
+        def empty(self):
+            return not bool([b for b in self.data if b != 0])
+        def description(self):
+            c = chr(self.index)
+            if c.isprintable():
+                return "Glyph {:02x}: '{}'".format(self.index, c)
+            else:
+                return "Glyph {:02x}".format(self.index)
+
+    def __getitem__(self, i):
+        c = self.__header.charsize
+        n = i * c + self.__header.offset
+        return PSF2.Glyph(i, self.__data[n:n+c])
+
+    class __iter:
+        __slots__ = ['font', 'n']
+        def __init__(self, font):
+            self.font = font
+            self.n = 0
+        def __next__(self):
+            if self.n < self.font.count:
+                glyph = self.font[self.n]
+                self.n += 1
+                return glyph
+            else:
+                raise StopIteration
+
+    def __iter__(self):
+        return PSF2.__iter(self)

scripts/parse_font.py

@@ -1,21 +1,6 @@
 #!/usr/bin/env python3
 
-MAGIC = (0x72, 0xb5, 0x4a, 0x86)
-
-from collections import namedtuple
-PSF2 = namedtuple("PSF2", ["version", "offset", "flags", "count", "charsize", "height", "width"])
-
-def read_header(data):
-    from struct import unpack_from, calcsize
-
-    fmt = "BBBBIIIIIII"
-
-    values = unpack_from(fmt, data)
-    if values[:len(MAGIC)] != MAGIC:
-        raise Exception("Bad magic number in header")
-
-    return PSF2(*values[len(MAGIC):])
-
+from fontpsf import PSF2
 
 def print_glyph(header, data):
     bw = (header.width + 7) // 8
@@ -28,16 +13,15 @@ def print_glyph(header, data):
 
 
 def display_font(filename):
-    data = open(filename, 'rb').read()
+    font = PSF2.load(filename)
+    print(font.header)
 
-    header = read_header(data)
-    print(header)
-
-    c = header.charsize
-    for i in range(0, header.count):
-        n = i * c + header.offset
-        print("Glyph {}:".format(i))
-        print_glyph(header, data[n:n+c])
+    for glyph in font:
+        if glyph.empty():
+            print("{}: BLANK".format(glyph.description()))
+        else:
+            print("{}:".format(glyph.description()))
+            print_glyph(font.header, glyph.data)
 
 
 if __name__ == "__main__":

scripts/psf_to_cpp.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+
+from fontpsf import PSF2
+
+def print_header(filename):
+    font = PSF2.load(filename)
+
+    print("#pragma once")
+    print(f"// This file was autogenerated by psf_to_cpp.py from {font.filename}\n")
+
+    print(f"const uint8_t font_glyph_size = {font.charsize};")
+    print(f"const uint8_t font_glyph_width = {font.dimension[0]};")
+    print(f"const uint8_t font_glyph_height = {font.dimension[1]};")
+    print(f"const uint16_t font_glyph_count = {font.count};\n")
+
+    print('const uint8_t font_glyph_data[] = {')
+
+    for glyph in font:
+        print("    ", "".join([f"0x{b:02x}," for b in glyph.data]), end="")
+        print(" // {}".format(glyph.description()))
+
+    print("};")
+
+if __name__ == "__main__":
+    import sys
+    for filename in sys.argv[1:]:
+        print_header(filename)

scripts/templates/build.ninja.j2

@@ -190,15 +190,15 @@ build $builddir/fatroot/efi/boot/bootx64.efi : cp $builddir/boot/boot.efi
 build $builddir/fatroot/nulldrv.elf : cp $builddir/user/nulldrv.elf
     name = null driver to FAT image
 
-build $builddir/fatroot/terminal.elf : cp $builddir/user/nulldrv.elf
-    name = terminal driver to FAT image
+build $builddir/fatroot/fb.elf : cp $builddir/user/fb.elf
+    name = fb driver to FAT image
 
 build ${builddir}/fatroot/symbol_table.dat : makest ${builddir}/jsix.elf
 
 build $builddir/jsix.img : makefat | $
     $builddir/fatroot/symbol_table.dat $
     $builddir/fatroot/nulldrv.elf $
-    $builddir/fatroot/terminal.elf $
+    $builddir/fatroot/fb.elf $
     $builddir/fatroot/jsix.elf $
     $builddir/fatroot/efi/boot/bootx64.efi
     name = jsix.img

src/arch/x86_64/kernel.ld

@@ -1,4 +1,4 @@
-ENTRY(_start)
+ENTRY(_kernel_start)
 SECTIONS
 {
 	. = 0xFFFF800000000000;

src/boot/console.cpp

@@ -17,23 +17,7 @@ namespace boot {
 size_t ROWS = 0;
 size_t COLS = 0;
 
-static constexpr int level_ok = 0;
-static constexpr int level_warn = 1;
-static constexpr int level_fail = 2;
-
-static const wchar_t *level_tags[] = {
-	L"  ok  ",
-	L" warn ",
-	L"failed"
-};
-static const uefi::attribute level_colors[] = {
-	uefi::attribute::green,
-	uefi::attribute::brown,
-	uefi::attribute::light_red
-};
-
 console *console::s_console = nullptr;
-status_line *status_line::s_current = nullptr;
 
 static const wchar_t digits[] = {u'0', u'1', u'2', u'3', u'4', u'5',
 	u'6', u'7', u'8', u'9', u'a', u'b', u'c', u'd', u'e', u'f'};
@@ -49,9 +33,10 @@ wstrlen(const wchar_t *s)
 
 
 console::console(uefi::boot_services *bs, uefi::protos::simple_text_output *out) :
-	m_rows(0),
-	m_cols(0),
-	m_out(out)
+	m_rows {0},
+	m_cols {0},
+	m_out {out},
+	m_fb {0, 0}
 {
 	pick_mode(bs);
 
@@ -72,6 +57,25 @@ console::console(uefi::boot_services *bs, uefi::protos::simple_text_output *out)
 	m_out->set_attribute(uefi::attribute::light_gray);
 	m_out->output_string(L" booting...\r\n\n");
 
+	if (m_fb.type != kernel::args::fb_type::none) {
+		wchar_t const * type = nullptr;
+		switch (m_fb.type) {
+		case kernel::args::fb_type::rgb8:
+			type = L"rgb8";
+			break;
+		case kernel::args::fb_type::bgr8:
+			type = L"bgr8";
+			break;
+		default:
+			type = L"unknown";
+		}
+
+		printf(L"Found framebuffer: %dx%d[%d] type %s @0x%x\r\n",
+			m_fb.horizontal, m_fb.vertical, m_fb.scanline, type, m_fb.phys_addr);
+	} else {
+		printf(L"No framebuffer found.\r\n");
+	}
+
 	s_console = this;
 }
 
@@ -82,9 +86,14 @@ console::pick_mode(uefi::boot_services *bs)
 	uefi::protos::graphics_output *gfx_out_proto;
 	uefi::guid guid = uefi::protos::graphics_output::guid;
 
-	try_or_raise(
-		bs->locate_protocol(&guid, nullptr, (void **)&gfx_out_proto),
-		L"Failed to find a Graphics Output Protocol handle");
+	m_fb.type = kernel::args::fb_type::none;
+
+	uefi::status has_gop = bs->locate_protocol(&guid, nullptr,
+		(void **)&gfx_out_proto);
+
+	if (has_gop != uefi::status::success)
+		// No video output found, skip it
+		return;
 
 	const uint32_t modes = gfx_out_proto->mode->max_mode;
 	uint32_t best = gfx_out_proto->mode->mode;
@@ -93,7 +102,7 @@ console::pick_mode(uefi::boot_services *bs)
 		(uefi::graphics_output_mode_info *)gfx_out_proto->mode;
 
 	uint32_t res = info->horizontal_resolution * info->vertical_resolution;
-	int is_fb = info->pixel_format != uefi::pixel_format::blt_only;
+	int pixmode = static_cast<int>(info->pixel_format);
 
 	for (uint32_t i = 0; i < modes; ++i) {
 		size_t size = 0;
@@ -107,17 +116,37 @@ console::pick_mode(uefi::boot_services *bs)
 #endif
 
 		const uint32_t new_res = info->horizontal_resolution * info->vertical_resolution;
-		const int new_is_fb = info->pixel_format != uefi::pixel_format::blt_only;
+		int new_pixmode = static_cast<int>(info->pixel_format);
 
-		if (new_is_fb > is_fb && new_res >= res) {
+		if (new_pixmode <= pixmode && new_res >= res) {
 			best = i;
 			res = new_res;
+			pixmode = new_pixmode;
 		}
 	}
 
 	try_or_raise(
 		gfx_out_proto->set_mode(best),
 		L"Failed to set graphics mode");
+
+	if (pixmode <= static_cast<int>(uefi::pixel_format::bgr8)) {
+		m_fb.phys_addr = gfx_out_proto->mode->frame_buffer_base;
+		m_fb.size = gfx_out_proto->mode->frame_buffer_size;
+		m_fb.vertical = gfx_out_proto->mode->info->vertical_resolution;
+		m_fb.horizontal = gfx_out_proto->mode->info->horizontal_resolution;
+		m_fb.scanline = gfx_out_proto->mode->info->pixels_per_scanline;
+
+		switch (gfx_out_proto->mode->info->pixel_format) {
+		case uefi::pixel_format::rgb8:
+			m_fb.type = kernel::args::fb_type::rgb8;
+			break;
+		case uefi::pixel_format::bgr8:
+			m_fb.type = kernel::args::fb_type::bgr8;
+			break;
+		default:
+			m_fb.type = kernel::args::fb_type::none;
+		}
+	}
 }
 
 size_t
@@ -272,176 +301,4 @@ console::print(const wchar_t *fmt, ...)
 	return result;
 }
 
-status_line::status_line(const wchar_t *message, const wchar_t *context) :
-	m_level(level_ok)
-{
-	auto out = console::get().m_out;
-	m_line = out->mode->cursor_row;
-	m_depth = (s_current ? 1 + s_current->m_depth : 0);
-
-	int indent = 2 * m_depth;
-	out->set_cursor_position(indent, m_line);
-	out->set_attribute(uefi::attribute::light_gray);
-	out->output_string(message);
-
-	if (context) {
-		out->output_string(L": ");
-		out->output_string(context);
-	}
-
-	out->output_string(L"\r\n");
-
-	m_next = s_current;
-	s_current = this;
-}
-
-status_line::~status_line()
-{
-	if (s_current != this)
-		error::raise(uefi::status::unsupported, L"Destroying non-current status_line");
-
-	finish();
-	if (m_next && m_level > m_next->m_level) {
-		m_next->m_level = m_level;
-		m_next->print_status_tag();
-	}
-	s_current = m_next;
-}
-
-void
-status_line::print_status_tag()
-{
-	auto out = console::get().m_out;
-	int row = out->mode->cursor_row;
-	int col = out->mode->cursor_column;
-
-	uefi::attribute color = level_colors[m_level];
-	const wchar_t *tag = level_tags[m_level];
-
-	out->set_cursor_position(50, m_line);
-
-	out->set_attribute(uefi::attribute::light_gray);
-	out->output_string(L"[");
-	out->set_attribute(color);
-	out->output_string(tag);
-	out->set_attribute(uefi::attribute::light_gray);
-	out->output_string(L"]\r\n");
-
-	out->set_cursor_position(col, row);
-}
-
-void
-status_line::do_warn(const wchar_t *message, const wchar_t *error)
-{
-	auto out = console::get().m_out;
-	int row = out->mode->cursor_row;
-
-	if (m_level < level_warn) {
-		m_level = level_warn;
-		print_status_tag();
-	}
-
-	int indent = 2 + 2 * m_depth;
-	out->set_cursor_position(indent, row);
-	out->set_attribute(uefi::attribute::yellow);
-	out->output_string(message);
-
-	if (error) {
-		out->output_string(L": ");
-		out->output_string(error);
-	}
-
-	out->set_attribute(uefi::attribute::light_gray);
-	out->output_string(L"\r\n");
-}
-
-void
-status_line::do_fail(const wchar_t *message, const wchar_t *error)
-{
-	auto out = console::get().m_out;
-	int row = out->mode->cursor_row;
-
-	if (s_current->m_level < level_fail) {
-		m_level = level_fail;
-		print_status_tag();
-	}
-
-	int indent = 2 + 2 * m_depth;
-	out->set_cursor_position(indent, row);
-	out->set_attribute(uefi::attribute::red);
-	out->output_string(message);
-
-	if (error) {
-		out->output_string(L": ");
-		out->output_string(error);
-	}
-
-	out->set_attribute(uefi::attribute::light_gray);
-	out->output_string(L"\r\n");
-}
-
-void
-status_line::finish()
-{
-	if (m_level <= level_ok)
-		print_status_tag();
-}
-
-/*
-uefi::status
-con_get_framebuffer(
-	EFI_BOOT_SERVICES *bootsvc,
-	void **buffer,
-	size_t *buffer_size,
-	uint32_t *hres,
-	uint32_t *vres,
-	uint32_t *rmask,
-	uint32_t *gmask,
-	uint32_t *bmask)
-{
-	uefi::status status;
-
-	uefi::protos::graphics_output *gop;
-	status = bootsvc->LocateProtocol(&guid_gfx_out, NULL, (void **)&gop);
-	if (status != EFI_NOT_FOUND) {
-		CHECK_EFI_STATUS_OR_RETURN(status, "LocateProtocol gfx");
-
-		*buffer = (void *)gop->Mode->FrameBufferBase;
-		*buffer_size = gop->Mode->FrameBufferSize;
-		*hres = gop->Mode->Info->horizontal_resolution;
-		*vres = gop->Mode->Info->vertical_resolution;
-
-		switch (gop->Mode->Info->PixelFormat) {
-			case PixelRedGreenBlueReserved8BitPerColor:
-				*rmask = 0x0000ff;
-				*gmask = 0x00ff00;
-				*bmask = 0xff0000;
-				return EFI_SUCCESS;
-
-			case PixelBlueGreenRedReserved8BitPerColor:
-				*bmask = 0x0000ff;
-				*gmask = 0x00ff00;
-				*rmask = 0xff0000;
-				return EFI_SUCCESS;
-
-			case PixelBitMask:
-				*rmask = gop->Mode->Info->PixelInformation.RedMask;
-				*gmask = gop->Mode->Info->PixelInformation.GreenMask;
-				*bmask = gop->Mode->Info->PixelInformation.BlueMask;
-				return EFI_SUCCESS;
-
-			default:
-				// Not a framebuffer, fall through to zeroing out
-				// values below.
-				break;
-		}
-	}
-
-	*buffer = NULL;
-	*buffer_size = *hres = *vres = 0;
-	*rmask = *gmask = *bmask = 0;
-	return EFI_SUCCESS;
-}
-*/
-
 } // namespace boot

src/boot/console.h

@@ -1,10 +1,12 @@
 /// \file console.h
-/// Text output and status message handling
+/// Text output handler
 #pragma once
 #include <stdarg.h>
 #include <stddef.h>
 #include <uefi/boot_services.h>
 #include <uefi/protos/simple_text_output.h>
+#include "kernel_args.h"
+#include "types.h"
 
 namespace boot {
 
@@ -12,6 +14,8 @@ namespace boot {
 class console
 {
 public:
+	using framebuffer = kernel::args::framebuffer;
+
 	console(uefi::boot_services *bs, uefi::protos::simple_text_output *out);
 
 	size_t print_hex(uint32_t n) const;
@@ -20,6 +24,8 @@ public:
 	size_t print_long_dec(uint64_t n) const;
 	size_t printf(const wchar_t *fmt, ...) const;
 
+	const framebuffer & fb() const { return m_fb; };
+
 	static console & get() { return *s_console; }
 	static size_t print(const wchar_t *fmt, ...);
 
@@ -31,50 +37,9 @@ private:
 
 	size_t m_rows, m_cols;
 	uefi::protos::simple_text_output *m_out;
+	framebuffer m_fb;
 
 	static console *s_console;
 };
 
-/// Scoped status line reporter. Prints a message and an "OK" if no errors
-/// or warnings were reported before destruction, otherwise reports the
-/// error or warning.
-class status_line
-{
-public:
-	/// Constructor.
-	/// \arg message  Description of the operation in progress
-	/// \arg context  If non-null, printed after `message` and a colon
-	status_line(const wchar_t *message, const wchar_t *context = nullptr);
-	~status_line();
-
-	/// Set the state to warning, and print a message. If the state is already at
-	/// warning or error, the state is unchanged but the message is still printed.
-	/// \arg message  The warning message to print
-	/// \arg error    If non-null, printed after `message`
-	inline static void warn(const wchar_t *message, const wchar_t *error = nullptr) {
-		if (s_current) s_current->do_warn(message, error);
-	}
-
-	/// Set the state to error, and print a message. If the state is already at
-	/// error, the state is unchanged but the message is still printed.
-	/// \arg message  The error message to print
-	/// \arg error    If non-null, printed after `message`
-	inline static void fail(const wchar_t *message, const wchar_t *error = nullptr) {
-		if (s_current) s_current->do_fail(message, error);
-	}
-
-private:
-	void print_status_tag();
-	void do_warn(const wchar_t *message, const wchar_t *error);
-	void do_fail(const wchar_t *message, const wchar_t *error);
-	void finish();
-
-	size_t m_line;
-	int m_level;
-	int m_depth;
-
-	status_line *m_next;
-	static status_line *s_current;
-};
-
 } // namespace boot

src/boot/error.cpp

@@ -1,11 +1,11 @@
 #include "error.h"
 #include "console.h"
+#include "kernel_args.h"
+#include "status.h"
 
 namespace boot {
 namespace error {
 
-handler *handler::s_current = nullptr;
-
 struct error_code_desc {
 	uefi::status code;
 	const wchar_t *name;
@@ -20,8 +20,8 @@ struct error_code_desc error_table[] = {
 	{ uefi::status::success, nullptr }
 };
 
-static const wchar_t *
-error_message(uefi::status status)
+const wchar_t *
+message(uefi::status status)
 {
 	int32_t i = -1;
 	while (error_table[++i].name != nullptr) {
@@ -34,56 +34,31 @@ error_message(uefi::status status)
 		return L"Unknown Warning";
 }
 
-[[ noreturn ]] void
-raise(uefi::status status, const wchar_t *message)
-{
-	if (handler::s_current) {
-		handler::s_current->handle(status, message);
-	}
-	while (1) asm("hlt");
-}
-
-handler::handler() :
-	m_next(s_current)
-{
-	s_current = this;
-}
-
-handler::~handler()
-{
-	if (s_current != this)
-		raise(uefi::status::warn_stale_data,
-				L"Non-current error handler destructing");
-	s_current = m_next;
-}
-
-uefi_handler::uefi_handler(console &con) :
-	handler(),
-	m_con(con)
-{
-}
-
-void
-uefi_handler::handle(uefi::status s, const wchar_t *message)
-{
-	status_line::fail(message, error_message(s));
-}
-
-cpu_assert_handler::cpu_assert_handler() : handler() {}
-
-void
-cpu_assert_handler::handle(uefi::status s, const wchar_t *message)
+[[ noreturn ]] static void
+cpu_assert(uefi::status s, const wchar_t *message)
 {
 	asm volatile (
 		"movq $0xeeeeeeebadbadbad, %%r8;"
 		"movq %0, %%r9;"
+		"movq %1, %%r10;"
 		"movq $0, %%rdx;"
 		"divq %%rdx;"
 		:
-		: "r"((uint64_t)s)
-		: "rax", "rdx", "r8", "r9");
+		: "r"((uint64_t)s), "r"(message)
+		: "rax", "rdx", "r8", "r9", "r10");
+	while (1) asm("hlt");
 }
 
+[[ noreturn ]] void
+raise(uefi::status status, const wchar_t *message)
+{
+	if(status_line::fail(message, status))
+		while (1) asm("hlt");
+	else
+		cpu_assert(status, message);
+}
+
+
 } // namespace error
 } // namespace boot
 

src/boot/error.h

@@ -14,48 +14,7 @@ namespace error {
 /// Halt or exit the program with the given error status/message
 [[ noreturn ]] void raise(uefi::status status, const wchar_t *message);
 
-/// Interface for error-handling functors
-class handler
-{
-public:
-	/// Constructor must be called by implementing classes.
-	handler();
-	virtual ~handler();
-
-	/// Interface for implementations of error handling.
-	virtual void handle(uefi::status, const wchar_t*) = 0;
-
-private:
-	friend void raise(uefi::status, const wchar_t *);
-
-	handler *m_next;
-	static handler *s_current;
-};
-
-/// Error handler using UEFI boot services. Integrates with `status_line`
-/// to print formatted error messages to the screen.
-class uefi_handler :
-	public handler
-{
-public:
-	uefi_handler(console &con);
-	virtual ~uefi_handler() {}
-	void handle(uefi::status, const wchar_t*) override;
-
-private:
-	console &m_con;
-};
-
-/// Error handler that doesn't rely on UEFI. Sets status into CPU
-/// registers and then causes a CPU #DE exception.
-class cpu_assert_handler :
-	public handler
-{
-public:
-	cpu_assert_handler();
-	virtual ~cpu_assert_handler() {}
-	void handle(uefi::status, const wchar_t*) override;
-};
+const wchar_t * message(uefi::status status);
 
 } // namespace error
 } // namespace boot

src/boot/fs.cpp

@@ -8,6 +8,7 @@
 #include "console.h"
 #include "error.h"
 #include "memory.h"
+#include "status.h"
 
 namespace boot {
 namespace fs {

src/boot/hardware.cpp

@@ -1,6 +1,7 @@
 #include "hardware.h"
 #include "console.h"
 #include "error.h"
+#include "status.h"
 
 namespace boot {
 namespace hw {

src/boot/loader.cpp

@@ -8,6 +8,7 @@
 #include "fs.h"
 #include "memory.h"
 #include "paging.h"
+#include "status.h"
 
 namespace args = kernel::args;
 
@@ -81,7 +82,7 @@ load_program(
 
 	try_or_raise(
 		bs->allocate_pages(uefi::allocate_type::any_pages,
-			memory::program_type, num_pages, &pages),
+			uefi::memory_type::loader_data, num_pages, &pages),
 		L"Failed allocating space for program");
 
 	bs->set_mem(pages, total_size, 0);
@@ -97,13 +98,8 @@ load_program(
 		void *src_start = offset_ptr<void>(data.data, pheader->offset);
 		void *dest_start = offset_ptr<void>(pages, pheader->vaddr - prog_base);
 		bs->copy_mem(dest_start, src_start, pheader->file_size);
-
-		console::print(L"    section %d phys: 0x%lx\r\n", i, pages);
-		console::print(L"    section %d virt: 0x%lx\r\n", i, pheader->vaddr);
 	}
 
-	console::print(L"    entrypoint:     0x%lx\r\n", header->entrypoint);
-
 	program.phys_addr = reinterpret_cast<uintptr_t>(pages);
 	program.size = total_size;
 	program.virt_addr = prog_base;

src/boot/main.cpp

@@ -8,12 +8,14 @@
 #include <stdint.h>
 
 #include "console.h"
+#include "cpu/cpu.h"
 #include "error.h"
 #include "fs.h"
 #include "hardware.h"
 #include "loader.h"
 #include "memory.h"
 #include "paging.h"
+#include "status.h"
 
 #include "kernel_args.h"
 
@@ -37,7 +39,7 @@ struct program_desc
 const program_desc program_list[] = {
 	{L"kernel", L"jsix.elf"},
 	{L"null driver", L"nulldrv.elf"},
-	//{L"terminal driver", L"terminal.elf"},
+	{L"fb driver", L"fb.elf"},
 };
 
 /// Change a pointer to point to the higher-half linear-offset version
@@ -56,7 +58,7 @@ allocate_args_structure(
 	size_t max_modules,
 	size_t max_programs)
 {
-	status_line status(L"Setting up kernel args memory");
+	status_line status {L"Setting up kernel args memory"};
 
 	args::header *args = nullptr;
 
@@ -66,7 +68,7 @@ allocate_args_structure(
 		max_programs * sizeof(args::program); // The program structures
 
 	try_or_raise(
-		bs->allocate_pool(memory::args_type, args_size,
+		bs->allocate_pool(uefi::memory_type::loader_data, args_size,
 			reinterpret_cast<void**>(&args)),
 		L"Could not allocate argument memory");
 
@@ -93,17 +95,35 @@ add_module(args::header *args, args::mod_type type, buffer &data)
 	m.size = data.size;
 }
 
+/// Check that all required cpu features are supported
+void
+check_cpu_supported()
+{
+	status_line status {L"Checking CPU features"};
+
+	cpu::cpu_id cpu;
+	uint64_t missing = cpu.missing();
+	if (missing) {
+#define CPU_FEATURE_OPT(...)
+#define CPU_FEATURE_REQ(name, ...) \
+		if (!cpu.has_feature(cpu::feature::name)) { \
+			status::fail(L"CPU required feature " L ## #name, uefi::status::unsupported); \
+		}
+#include "cpu/features.inc"
+#undef CPU_FEATURE_REQ
+#undef CPU_FEATURE_OPT
+
+		error::raise(uefi::status::unsupported, L"CPU not supported");
+	}
+}
+
 /// The main procedure for the portion of the loader that runs while
 /// UEFI is still in control of the machine. (ie, while the loader still
 /// has access to boot services.
 args::header *
-bootloader_main_uefi(
-	uefi::handle image,
-	uefi::system_table *st,
-	console &con)
+uefi_preboot(uefi::handle image, uefi::system_table *st)
 {
-	error::uefi_handler handler(con);
-	status_line status(L"Performing UEFI pre-boot");
+	status_line status {L"Performing UEFI pre-boot"};
 
 	uefi::boot_services *bs = st->boot_services;
 	uefi::runtime_services *rs = st->runtime_services;
@@ -122,9 +142,8 @@ bootloader_main_uefi(
 
 	fs::file disk = fs::get_boot_volume(image, bs);
 
-	const uefi::memory_type mod_type = memory::module_type;
 	buffer symbols = loader::load_file(disk, L"symbol table", L"symbol_table.dat",
-				memory::module_type);
+				uefi::memory_type::loader_data);
 	add_module(args, args::mod_type::symbol_table, symbols);
 
 	for (auto &desc : program_list) {
@@ -141,35 +160,49 @@ bootloader_main_uefi(
 	return args;
 }
 
+memory::efi_mem_map
+uefi_exit(args::header *args, uefi::handle image, uefi::boot_services *bs)
+{
+	status_line status {L"Exiting UEFI"};
+
+	memory::efi_mem_map map =
+		memory::build_kernel_mem_map(args, bs);
+
+	try_or_raise(
+		bs->exit_boot_services(image, map.key),
+		L"Failed to exit boot services");
+
+	return map;
+}
+
 } // namespace boot
 
 /// The UEFI entrypoint for the loader.
 extern "C" uefi::status
-efi_main(uefi::handle image_handle, uefi::system_table *st)
+efi_main(uefi::handle image, uefi::system_table *st)
 {
 	using namespace boot;
-
-	error::cpu_assert_handler handler;
 	console con(st->boot_services, st->con_out);
+	check_cpu_supported();
 
-	args::header *args =
-		bootloader_main_uefi(image_handle, st, con);
+	args::header *args = uefi_preboot(image, st);
+	memory::efi_mem_map map = uefi_exit(args, image, st->boot_services);
+
+	args->video = con.fb();
+	status_bar status {con.fb()}; // Switch to fb status display
 
 	args::program &kernel = args->programs[0];
 	paging::map_pages(args, kernel.phys_addr, kernel.virt_addr, kernel.size);
 	kernel::entrypoint kentry =
 		reinterpret_cast<kernel::entrypoint>(kernel.entrypoint);
-
-	memory::efi_mem_map map =
-		memory::build_kernel_mem_map(args, st->boot_services);
-
-	try_or_raise(
-		st->boot_services->exit_boot_services(image_handle, map.key),
-		L"Failed to exit boot services");
+	status.next();
 
 	memory::virtualize(args->pml4, map, st->runtime_services);
+	status.next();
+
 	change_pointer(args->pml4);
 	hw::setup_cr4();
+	status.next();
 
 	kentry(args);
 	debug_break();

src/boot/memory.cpp

@@ -7,6 +7,7 @@
 #include "error.h"
 #include "memory.h"
 #include "paging.h"
+#include "status.h"
 
 namespace boot {
 namespace memory {
@@ -35,20 +36,28 @@ static const wchar_t *memory_type_names[] = {
 	L"persistent memory"
 };
 
+static const wchar_t *kernel_memory_type_names[] = {
+	L"free",
+	L"pending",
+	L"acpi",
+	L"uefi_runtime",
+	L"mmio",
+	L"persistent"
+};
+
 static const wchar_t *
 memory_type_name(uefi::memory_type t)
 {
-	if (t < uefi::memory_type::max_memory_type) {
+	if (t < uefi::memory_type::max_memory_type)
 		return memory_type_names[static_cast<uint32_t>(t)];
+
+	return L"Bad Type Value";
 }
 
-	switch(t) {
-		case args_type:		return L"jsix kernel args";
-		case module_type:	return L"jsix bootloader module";
-		case program_type:	return L"jsix kernel or program code";
-		case table_type:	return L"jsix page tables";
-		default: return L"Bad Type Value";
-	}
+static const wchar_t *
+kernel_memory_type_name(kernel::args::mem_type t)
+{
+	return kernel_memory_type_names[static_cast<uint32_t>(t)];
 }
 
 void
@@ -100,14 +109,15 @@ can_merge(mem_entry &prev, mem_type type, uefi::memory_descriptor *next)
 void
 get_uefi_mappings(efi_mem_map *map, bool allocate, uefi::boot_services *bs)
 {
-	status_line(L"Getting UEFI memory map");
-
+	size_t length = 0;
 	uefi::status status = bs->get_memory_map(
-		&map->length, nullptr, &map->key, &map->size, &map->version);
+		&length, nullptr, &map->key, &map->size, &map->version);
 
 	if (status != uefi::status::buffer_too_small)
 		error::raise(status, L"Error getting memory map size");
 
+	map->length = length;
+
 	if (allocate) {
 		map->length += 10*map->size;
 
@@ -126,29 +136,30 @@ get_uefi_mappings(efi_mem_map *map, bool allocate, uefi::boot_services *bs)
 efi_mem_map
 build_kernel_mem_map(kernel::args::header *args, uefi::boot_services *bs)
 {
-	status_line(L"Creating kernel memory map");
+	status_line status {L"Creating kernel memory map"};
 
-	efi_mem_map efi_map;
-	get_uefi_mappings(&efi_map, false, bs);
+	efi_mem_map map;
+	get_uefi_mappings(&map, false, bs);
 
-	size_t map_size = efi_map.num_entries() * sizeof(mem_entry);
+	size_t map_size = map.num_entries() * sizeof(mem_entry);
 
 	kernel::args::mem_entry *kernel_map = nullptr;
 	try_or_raise(
 		bs->allocate_pages(
 			uefi::allocate_type::any_pages,
-			module_type,
+			uefi::memory_type::loader_data,
 			bytes_to_pages(map_size),
 			reinterpret_cast<void**>(&kernel_map)),
 		L"Error allocating kernel memory map module space");
 
 	bs->set_mem(kernel_map, map_size, 0);
-	get_uefi_mappings(&efi_map, true, bs);
+	get_uefi_mappings(&map, true, bs);
 
 	size_t i = 0;
 	bool first = true;
-	for (auto desc : efi_map) {
+	for (auto desc : map) {
 		/*
+		// EFI map dump
 		console::print(L"   Range %lx (%lx) %x(%s) [%lu]\r\n",
 			desc->physical_start, desc->attribute, desc->type, memory_type_name(desc->type), desc->number_of_pages);
 		*/
@@ -162,13 +173,16 @@ build_kernel_mem_map(kernel::args::header *args, uefi::boot_services *bs)
 				continue;
 
 			case uefi::memory_type::loader_code:
-			case uefi::memory_type::loader_data:
 			case uefi::memory_type::boot_services_code:
 			case uefi::memory_type::boot_services_data:
 			case uefi::memory_type::conventional_memory:
 				type = mem_type::free;
 				break;
 
+			case uefi::memory_type::loader_data:
+				type = mem_type::pending;
+				break;
+
 			case uefi::memory_type::runtime_services_code:
 			case uefi::memory_type::runtime_services_data:
 				type = mem_type::uefi_runtime;
@@ -187,22 +201,6 @@ build_kernel_mem_map(kernel::args::header *args, uefi::boot_services *bs)
 				type = mem_type::persistent;
 				break;
 
-			case args_type:
-				type = mem_type::args;
-				break;
-
-			case module_type:
-				type = mem_type::module;
-				break;
-
-			case program_type:
-				type = mem_type::program;
-				break;
-
-			case table_type:
-				type = mem_type::table;
-				break;
-
 			default:
 				error::raise(
 					uefi::status::invalid_parameter,
@@ -235,7 +233,16 @@ build_kernel_mem_map(kernel::args::header *args, uefi::boot_services *bs)
 	args->mem_map = kernel_map;
 	args->map_count = i;
 
-	return efi_map;
+	/*
+	// kernel map dump
+	for (unsigned i = 0; i < args->map_count; ++i) {
+		const kernel::args::mem_entry &e = kernel_map[i];
+		console::print(L"   Range %lx (%lx) %x(%s) [%lu]\r\n",
+			e.start, e.attr, e.type, kernel_memory_type_name(e.type), e.pages);
+	}
+	*/
+
+	return map;
 }
 
 void

src/boot/memory.h

@@ -18,28 +18,6 @@ inline constexpr size_t bytes_to_pages(size_t bytes) {
 	return ((bytes - 1) / page_size) + 1;
 }
 
-/// \defgroup memory_types
-/// Custom UEFI memory type values used for data being passed to the kernel
-/// @{
-
-/// Memory containing the kernel args structure
-constexpr uefi::memory_type args_type =
-	static_cast<uefi::memory_type>(0x80000000);
-
-/// Memory containing any loaded modules to be passed to the kernel
-constexpr uefi::memory_type module_type =
-	static_cast<uefi::memory_type>(0x80000001);
-
-/// Memory containing loaded kernel or program code and data sections
-constexpr uefi::memory_type program_type =
-	static_cast<uefi::memory_type>(0x80000002);
-
-/// Memory containing page tables set up by the loader
-constexpr uefi::memory_type table_type =
-	static_cast<uefi::memory_type>(0x80000003);
-
-/// @}
-
 /// \defgroup pointer_fixup
 /// Memory virtualization pointer fixup functions. Handles changing affected pointers
 /// when calling UEFI's `set_virtual_address_map` function to change the location of

src/boot/paging.cpp

@@ -6,6 +6,7 @@
 #include "memory.h"
 #include "paging.h"
 #include "pointer_manipulation.h"
+#include "status.h"
 
 namespace boot {
 namespace paging {
@@ -27,7 +28,7 @@ using ::memory::table_entries;
 /// Page table entry flags for entries pointing at a page
 constexpr uint16_t page_flags = 0x103;
 
-// Flags: 0  0 0 0 1  1 0 0 0  0 0 1 1 = 0x0183
+// Flags: 0  0 0 0 1  1 0 0 0  1 0 1 1 = 0x018b
 //        |   IGN  |  | | | |  | | | +- Present
 //        |        |  | | | |  | | +--- Writeable
 //        |        |  | | | |  | +----- Supervisor only
@@ -201,18 +202,21 @@ allocate_tables(kernel::args::header *args, uefi::boot_services *bs)
 	try_or_raise(
 		bs->allocate_pages(
 			uefi::allocate_type::any_pages,
-			memory::table_type,
+			uefi::memory_type::loader_data,
 			tables_needed,
 			&addr),
 		L"Error allocating page table pages.");
 
 	bs->set_mem(addr, tables_needed*page_size, 0);
 
-	args->pml4 = addr;
+	page_table *pml4 = reinterpret_cast<page_table*>(addr);
+
+	args->pml4 = pml4;
 	args->table_count = tables_needed - 1;
 	args->page_tables = offset_ptr<void>(addr, page_size);
 
-	page_table *pml4 = reinterpret_cast<page_table*>(addr);
+	console::print(L"    First page (pml4) at: 0x%lx\r\n", pml4);
+
 	add_kernel_pds(pml4, args->page_tables, args->table_count);
 	add_offset_mappings(pml4, args->page_tables, args->table_count);
 

src/boot/status.cpp

@@ -0,0 +1,263 @@
+#include <uefi/types.h>
+#include <uefi/graphics.h>
+
+#include "console.h"
+#include "error.h"
+#include "kernel_args.h"
+#include "status.h"
+
+constexpr int num_boxes = 30;
+
+namespace boot {
+
+static constexpr int level_ok = 0;
+static constexpr int level_warn = 1;
+static constexpr int level_fail = 2;
+
+static const wchar_t *level_tags[] = {
+	L"  ok  ",
+	L" warn ",
+	L"failed"
+};
+
+static const uefi::attribute level_colors[] = {
+	uefi::attribute::green,
+	uefi::attribute::brown,
+	uefi::attribute::light_red
+};
+
+status *status::s_current = nullptr;
+unsigned status::s_current_type = 0;
+unsigned status_bar::s_count = 0;
+
+status_line::status_line(const wchar_t *message, const wchar_t *context) :
+	m_level(level_ok),
+	m_depth(0),
+	m_outer(nullptr)
+{
+	if (status::s_current_type == status_line::type) {
+		m_outer = static_cast<status_line*>(s_current);
+		m_depth = (m_outer ? 1 + m_outer->m_depth : 0);
+	}
+	s_current = this;
+	s_current_type = status_line::type;
+
+	auto out = console::get().m_out;
+	m_line = out->mode->cursor_row;
+
+	int indent = 2 * m_depth;
+	out->set_cursor_position(indent, m_line);
+	out->set_attribute(uefi::attribute::light_gray);
+	out->output_string(message);
+
+	if (context) {
+		out->output_string(L": ");
+		out->output_string(context);
+	}
+
+	out->output_string(L"\r\n");
+	print_status_tag();
+}
+
+status_line::~status_line()
+{
+	if (s_current != this)
+		error::raise(uefi::status::unsupported, L"Destroying non-current status_line");
+
+	if (m_outer && m_level > m_outer->m_level) {
+		m_outer->m_level = m_level;
+		m_outer->print_status_tag();
+	}
+	s_current = m_outer;
+}
+
+void
+status_line::print_status_tag()
+{
+	auto out = console::get().m_out;
+	int row = out->mode->cursor_row;
+	int col = out->mode->cursor_column;
+
+	uefi::attribute color = level_colors[m_level];
+	const wchar_t *tag = level_tags[m_level];
+
+	out->set_cursor_position(50, m_line);
+
+	out->set_attribute(uefi::attribute::light_gray);
+	out->output_string(L"[");
+	out->set_attribute(color);
+	out->output_string(tag);
+	out->set_attribute(uefi::attribute::light_gray);
+	out->output_string(L"]\r\n");
+
+	out->set_cursor_position(col, row);
+}
+
+void
+status_line::do_warn(const wchar_t *message, uefi::status status)
+{
+	auto out = console::get().m_out;
+	int row = out->mode->cursor_row;
+
+	if (m_level < level_warn) {
+		m_level = level_warn;
+		print_status_tag();
+	}
+
+	int indent = 2 + 2 * m_depth;
+	out->set_cursor_position(indent, row);
+	out->set_attribute(uefi::attribute::yellow);
+	out->output_string(message);
+
+	const wchar_t *error = error::message(status);
+	if (error) {
+		out->output_string(L": ");
+		out->output_string(error);
+	}
+
+	out->set_attribute(uefi::attribute::light_gray);
+	out->output_string(L"\r\n");
+}
+
+void
+status_line::do_fail(const wchar_t *message, uefi::status status)
+{
+	auto out = console::get().m_out;
+	int row = out->mode->cursor_row;
+
+	if (m_level < level_fail) {
+		m_level = level_fail;
+		print_status_tag();
+	}
+
+	int indent = 2 + 2 * m_depth;
+	out->set_cursor_position(indent, row);
+	out->set_attribute(uefi::attribute::red);
+	out->output_string(message);
+
+	const wchar_t *error = error::message(status);
+	if (error) {
+		out->output_string(L": ");
+		out->output_string(error);
+	}
+
+	out->set_attribute(uefi::attribute::light_gray);
+	out->output_string(L"\r\n");
+}
+
+
+
+status_bar::status_bar(kernel::args::framebuffer const &fb) :
+	m_outer(nullptr)
+{
+	m_size = (fb.vertical / num_boxes) - 1;
+	m_top = fb.vertical - m_size;
+	m_horiz = fb.horizontal;
+	m_fb = reinterpret_cast<uint32_t*>(fb.phys_addr);
+	m_type = static_cast<uint16_t>(fb.type);
+	next();
+
+	if (status::s_current_type == status_bar::type)
+		m_outer = static_cast<status_bar*>(s_current);
+	s_current = this;
+	s_current_type = status_bar::type;
+}
+
+status_bar::~status_bar()
+{
+	if (s_current != this)
+		error::raise(uefi::status::unsupported, L"Destroying non-current status_bar");
+	draw_box();
+	s_current = m_outer;
+}
+
+void
+status_bar::do_warn(const wchar_t *message, uefi::status status)
+{
+	m_status = status;
+	if (m_level < level_warn) {
+		m_level = level_warn;
+		draw_box();
+	}
+}
+
+void
+status_bar::do_fail(const wchar_t *message, uefi::status status)
+{
+	m_status = status;
+	if (m_level < level_fail) {
+		m_level = level_fail;
+		draw_box();
+	}
+}
+
+static uint32_t
+make_color(uint8_t r, uint8_t g, uint8_t b, uint16_t type)
+{
+	switch (static_cast<kernel::args::fb_type>(type)) {
+	case kernel::args::fb_type::bgr8:
+		return
+			(static_cast<uint32_t>(b) <<  0) |
+			(static_cast<uint32_t>(g) <<  8) |
+			(static_cast<uint32_t>(r) << 16);
+
+	case kernel::args::fb_type::rgb8:
+		return
+			(static_cast<uint32_t>(r) <<  0) |
+			(static_cast<uint32_t>(g) <<  8) |
+			(static_cast<uint32_t>(b) << 16);
+	
+	default:
+		return 0;
+	}
+}
+
+void
+status_bar::draw_box()
+{
+	static const uint32_t colors[] = {0x909090, 0xf0f0f0};
+	constexpr unsigned ncolors = sizeof(colors) / sizeof(uint32_t);
+
+	if (m_fb == nullptr)
+		return;
+
+	unsigned x0 = m_current * m_size;
+	unsigned x1 = x0 + m_size - 3;
+	unsigned y0 = m_top;
+	unsigned y1 = m_top + m_size - 3;
+
+	uint32_t color = 0;
+	switch (m_level) {
+	case level_ok:
+		color = colors[m_current % ncolors];
+		break;
+	case level_warn:
+		color = make_color(0xff, 0xb2, 0x34, m_type);
+		break;
+	case level_fail:
+		color = make_color(0xfb, 0x0a, 0x1e, m_type);
+		break;
+	default:
+		color = 0;
+	}
+
+	for (unsigned y = y0; y < y1; ++y)
+		for (unsigned x = x0; x < x1; ++x)
+			m_fb[y * m_horiz + x] = color;
+
+	if (m_level > level_ok) {
+		unsigned nbars = static_cast<uint64_t>(m_status) & 0xffff;
+		constexpr unsigned bar_height = 4;
+
+		for (unsigned i = 1; i <= nbars; ++i) {
+			y0 = m_top - 2 * i * bar_height;
+			y1 = y0 + bar_height;
+
+			for (unsigned y = y0; y < y1; ++y)
+				for (unsigned x = x0; x < x1; ++x)
+					m_fb[y * m_horiz + x] = color;
+		}
+	}
+}
+
+} // namespace boot

src/boot/status.h

@@ -0,0 +1,122 @@
+/// \file status.h
+/// Status message and indicator handling
+#pragma once
+
+#include <stdint.h>
+#include <uefi/types.h>
+
+namespace kernel {
+namespace args {
+	class framebuffer;
+}
+}
+
+namespace boot {
+
+// Abstract base class for status reporters.
+class status
+{
+public:
+	virtual void do_warn(const wchar_t *message, uefi::status status) = 0;
+	virtual void do_fail(const wchar_t *message, uefi::status status) = 0;
+
+	/// Set the state to warning, and print a message. If the state is already at
+	/// warning or error, the state is unchanged but the message is still printed.
+	/// \arg message  The warning message to print, if text is supported
+	/// \arg status   If set, the error or warning code that should be represented
+	/// \returns      True if there was a status handler to display the warning
+	inline static bool warn(const wchar_t *message, uefi::status status = uefi::status::success) {
+		if (!s_current) return false;
+		s_current->do_warn(message, status);
+		return true;
+	}
+
+	/// Set the state to error, and print a message. If the state is already at
+	/// error, the state is unchanged but the message is still printed.
+	/// \arg message  The error message to print, if text is supported
+	/// \arg status   The error or warning code that should be represented
+	/// \returns      True if there was a status handler to display the failure
+	inline static bool fail(const wchar_t *message, uefi::status status) {
+		if (!s_current) return false;
+		s_current->do_fail(message, status);
+		return true;
+	}
+
+protected:
+	static status *s_current;
+	static unsigned s_current_type;
+};
+
+/// Scoped status line reporter. Prints a message and an "OK" if no errors
+/// or warnings were reported before destruction, otherwise reports the
+/// error or warning.
+class status_line :
+	public status
+{
+public:
+	constexpr static unsigned type = 1;
+
+	/// Constructor.
+	/// \arg message  Description of the operation in progress
+	/// \arg context  If non-null, printed after `message` and a colon
+	status_line(const wchar_t *message, const wchar_t *context = nullptr);
+	~status_line();
+
+	virtual void do_warn(const wchar_t *message, uefi::status status) override;
+	virtual void do_fail(const wchar_t *message, uefi::status status) override;
+
+private:
+	void print_status_tag();
+
+	size_t m_line;
+	int m_level;
+	int m_depth;
+
+	status_line *m_outer;
+};
+
+/// Scoped status bar reporter. Draws a row of boxes along the bottom of
+/// the screen, turning one red if there's an error in that step.
+class status_bar :
+	public status
+{
+public:
+	constexpr static unsigned type = 2;
+
+	using framebuffer = kernel::args::framebuffer;
+
+	/// Constructor.
+	/// \arg fb  The framebuffer descriptor to draw to
+	status_bar(kernel::args::framebuffer const &fb);
+	~status_bar();
+
+	virtual void do_warn(const wchar_t *message, uefi::status status) override;
+	virtual void do_fail(const wchar_t *message, uefi::status status) override;
+
+	inline void next() {
+		m_current = s_count++;
+		m_level = 0;
+		m_status = uefi::status::success;
+		draw_box();
+	}
+
+private:
+	void draw_box();
+
+	uint32_t *m_fb;
+	uint32_t m_size;
+	uint32_t m_top;
+	uint32_t m_horiz;
+
+	int m_level;
+	uefi::status m_status;
+
+	uint16_t m_type;
+	uint16_t m_current;
+
+	status_bar *m_outer;
+
+	static unsigned s_count;
+};
+
+} // namespace boot

src/drivers/fb/default_font.inc

@@ -0,0 +1,390 @@
+  0x72, 0xb5, 0x4a, 0x86, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00,
+  0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00,
+  0x10, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x7e, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x7e, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa,
+  0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x55, 0xaa, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x38, 0x44, 0x44, 0x44, 0x38, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0xf8,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0xf8, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x08, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x0f,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0xff, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x0f, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0xf8, 0x08, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0xff,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0xff, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1c,
+  0x22, 0x20, 0x20, 0xf8, 0x20, 0x20, 0x72, 0x8c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x10,
+  0x10, 0x10, 0x10, 0x10, 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x24, 0x24, 0x24, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x24, 0x7e, 0x24, 0x24,
+  0x24, 0x7e, 0x24, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x08,
+  0x1e, 0x20, 0x20, 0x1c, 0x02, 0x02, 0x3c, 0x08, 0x08, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x30, 0x49, 0x4a, 0x34, 0x08, 0x16, 0x29, 0x49, 0x06,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x48, 0x48, 0x48, 0x30, 0x31,
+  0x49, 0x46, 0x46, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x10,
+  0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x04, 0x08, 0x08, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x08,
+  0x08, 0x04, 0x00, 0x00, 0x00, 0x00, 0x20, 0x10, 0x10, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x10, 0x10, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x24, 0x18, 0x7e, 0x18, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x08, 0x7f, 0x08, 0x08, 0x08, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x18, 0x18, 0x08, 0x08, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x02, 0x04, 0x04, 0x08, 0x08,
+  0x10, 0x10, 0x20, 0x20, 0x40, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c,
+  0x42, 0x46, 0x4a, 0x52, 0x62, 0x42, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x08, 0x18, 0x28, 0x08, 0x08, 0x08, 0x08, 0x08, 0x3e,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x42, 0x02, 0x02, 0x04,
+  0x08, 0x10, 0x20, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e,
+  0x04, 0x08, 0x1c, 0x02, 0x02, 0x02, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x04, 0x0c, 0x14, 0x24, 0x44, 0x7e, 0x04, 0x04, 0x04,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x40, 0x40, 0x7c, 0x02,
+  0x02, 0x02, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1c,
+  0x20, 0x40, 0x40, 0x7c, 0x42, 0x42, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x7e, 0x02, 0x04, 0x04, 0x08, 0x08, 0x10, 0x10, 0x10,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x42, 0x42, 0x42, 0x3c,
+  0x42, 0x42, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c,
+  0x42, 0x42, 0x42, 0x3e, 0x02, 0x02, 0x04, 0x38, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x18, 0x18,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00,
+  0x00, 0x00, 0x18, 0x18, 0x08, 0x08, 0x10, 0x00, 0x00, 0x00, 0x00, 0x04,
+  0x08, 0x10, 0x20, 0x40, 0x20, 0x10, 0x08, 0x04, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x10, 0x08, 0x04, 0x02,
+  0x04, 0x08, 0x10, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x42,
+  0x02, 0x04, 0x08, 0x10, 0x00, 0x00, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x1c, 0x22, 0x41, 0x4f, 0x51, 0x51, 0x51, 0x53, 0x4d, 0x40,
+  0x20, 0x1f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x24, 0x42, 0x42, 0x42,
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+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x08, 0x08, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x48, 0x24, 0x12, 0x09, 0x12, 0x24, 0x48,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x08, 0x00,
+  0x00, 0x08, 0x10, 0x20, 0x40, 0x42, 0x3c, 0x00, 0x20, 0x10, 0x00, 0x18,
+  0x18, 0x24, 0x24, 0x24, 0x7e, 0x42, 0x42, 0x42, 0x00, 0x00, 0x00, 0x00,
+  0x04, 0x08, 0x00, 0x18, 0x18, 0x24, 0x24, 0x24, 0x7e, 0x42, 0x42, 0x42,
+  0x00, 0x00, 0x00, 0x00, 0x18, 0x24, 0x00, 0x18, 0x18, 0x24, 0x24, 0x24,
+  0x7e, 0x42, 0x42, 0x42, 0x00, 0x00, 0x00, 0x00, 0x32, 0x4c, 0x00, 0x18,
+  0x18, 0x24, 0x24, 0x24, 0x7e, 0x42, 0x42, 0x42, 0x00, 0x00, 0x00, 0x00,
+  0x24, 0x24, 0x00, 0x18, 0x18, 0x24, 0x24, 0x24, 0x7e, 0x42, 0x42, 0x42,
+  0x00, 0x00, 0x00, 0x00, 0x18, 0x24, 0x24, 0x18, 0x18, 0x24, 0x24, 0x24,
+  0x7e, 0x42, 0x42, 0x42, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f,
+  0x14, 0x14, 0x24, 0x27, 0x3c, 0x44, 0x44, 0x47, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x1e, 0x20, 0x40, 0x40, 0x40, 0x40, 0x40, 0x20, 0x1e,
+  0x08, 0x08, 0x30, 0x00, 0x20, 0x10, 0x00, 0x7e, 0x40, 0x40, 0x40, 0x7c,
+  0x40, 0x40, 0x40, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x04, 0x08, 0x00, 0x7e,
+  0x40, 0x40, 0x40, 0x7c, 0x40, 0x40, 0x40, 0x7e, 0x00, 0x00, 0x00, 0x00,
+  0x18, 0x24, 0x00, 0x7e, 0x40, 0x40, 0x40, 0x7c, 0x40, 0x40, 0x40, 0x7e,
+  0x00, 0x00, 0x00, 0x00, 0x24, 0x24, 0x00, 0x7e, 0x40, 0x40, 0x40, 0x7c,
+  0x40, 0x40, 0x40, 0x7e, 0x00, 0x00, 0x00, 0x00, 0x10, 0x08, 0x00, 0x3e,
+  0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x3e, 0x00, 0x00, 0x00, 0x00,
+  0x04, 0x08, 0x00, 0x3e, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x3e,
+  0x00, 0x00, 0x00, 0x00, 0x18, 0x24, 0x00, 0x3e, 0x08, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x00, 0x3e,
+  0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x3e, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x3c, 0x22, 0x21, 0x21, 0x79, 0x21, 0x21, 0x22, 0x3c,
+  0x00, 0x00, 0x00, 0x00, 0x32, 0x4c, 0x00, 0x42, 0x62, 0x52, 0x4a, 0x46,
+  0x42, 0x42, 0x42, 0x42, 0x00, 0x00, 0x00, 0x00, 0x10, 0x08, 0x00, 0x1c,
+  0x22, 0x41, 0x41, 0x41, 0x41, 0x41, 0x22, 0x1c, 0x00, 0x00, 0x00, 0x00,
+  0x04, 0x08, 0x00, 0x1c, 0x22, 0x41, 0x41, 0x41, 0x41, 0x41, 0x22, 0x1c,
+  0x00, 0x00, 0x00, 0x00, 0x18, 0x24, 0x00, 0x1c, 0x22, 0x41, 0x41, 0x41,
+  0x41, 0x41, 0x22, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x32, 0x4c, 0x00, 0x1c,
+  0x22, 0x41, 0x41, 0x41, 0x41, 0x41, 0x22, 0x1c, 0x00, 0x00, 0x00, 0x00,
+  0x24, 0x24, 0x00, 0x1c, 0x22, 0x41, 0x41, 0x41, 0x41, 0x41, 0x22, 0x1c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x22, 0x14,
+  0x08, 0x14, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x3c,
+  0x42, 0x46, 0x4a, 0x52, 0x62, 0x42, 0x42, 0x3c, 0x40, 0x00, 0x00, 0x00,
+  0x20, 0x10, 0x00, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3c,
+  0x00, 0x00, 0x00, 0x00, 0x04, 0x08, 0x00, 0x42, 0x42, 0x42, 0x42, 0x42,
+  0x42, 0x42, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x18, 0x24, 0x00, 0x42,
+  0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00,
+  0x24, 0x24, 0x00, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3c,
+  0x00, 0x00, 0x00, 0x00, 0x04, 0x08, 0x00, 0x41, 0x41, 0x22, 0x14, 0x08,
+  0x08, 0x08, 0x08, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40,
+  0x40, 0x7c, 0x42, 0x42, 0x42, 0x7c, 0x40, 0x40, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x3c, 0x42, 0x44, 0x4c, 0x42, 0x42, 0x42, 0x44, 0x58,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x10, 0x00, 0x3c, 0x02, 0x02,
+  0x3e, 0x42, 0x42, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x08,
+  0x00, 0x3c, 0x02, 0x02, 0x3e, 0x42, 0x42, 0x3e, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x18, 0x24, 0x00, 0x00, 0x3c, 0x02, 0x02, 0x3e, 0x42, 0x42, 0x3e,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x32, 0x4c, 0x00, 0x00, 0x3c, 0x02, 0x02,
+  0x3e, 0x42, 0x42, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x24,
+  0x00, 0x3c, 0x02, 0x02, 0x3e, 0x42, 0x42, 0x3e, 0x00, 0x00, 0x00, 0x00,
+  0x18, 0x24, 0x24, 0x18, 0x00, 0x3c, 0x02, 0x02, 0x3e, 0x42, 0x42, 0x3e,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x36, 0x09, 0x39,
+  0x4f, 0x48, 0x48, 0x37, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x3c, 0x42, 0x40, 0x40, 0x40, 0x42, 0x3c, 0x08, 0x08, 0x30, 0x00,
+  0x00, 0x00, 0x20, 0x10, 0x00, 0x3c, 0x42, 0x42, 0x7e, 0x40, 0x40, 0x3e,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x08, 0x00, 0x3c, 0x42, 0x42,
+  0x7e, 0x40, 0x40, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x24, 0x00,
+  0x00, 0x3c, 0x42, 0x42, 0x7e, 0x40, 0x40, 0x3e, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x24, 0x24, 0x00, 0x3c, 0x42, 0x42, 0x7e, 0x40, 0x40, 0x3e,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x08, 0x00, 0x38, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x08,
+  0x00, 0x38, 0x08, 0x08, 0x08, 0x08, 0x08, 0x3e, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x18, 0x24, 0x00, 0x00, 0x38, 0x08, 0x08, 0x08, 0x08, 0x08, 0x3e,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x24, 0x00, 0x38, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09, 0x06, 0x1a,
+  0x01, 0x1d, 0x23, 0x41, 0x41, 0x41, 0x22, 0x1c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x32, 0x4c, 0x00, 0x00, 0x7c, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x08, 0x00, 0x3c, 0x42, 0x42,
+  0x42, 0x42, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x08,
+  0x00, 0x3c, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x18, 0x24, 0x00, 0x00, 0x3c, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3c,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x32, 0x4c, 0x00, 0x00, 0x3c, 0x42, 0x42,
+  0x42, 0x42, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x24,
+  0x00, 0x3c, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3c, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x18, 0x18,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x3c, 0x46, 0x4a,
+  0x52, 0x62, 0x42, 0x3c, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x10,
+  0x00, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3e, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x04, 0x08, 0x00, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3e,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x24, 0x00, 0x00, 0x42, 0x42, 0x42,
+  0x42, 0x42, 0x42, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x24, 0x24,
+  0x00, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3e, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x04, 0x08, 0x00, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3e,
+  0x02, 0x02, 0x3c, 0x00, 0x00, 0x00, 0x40, 0x40, 0x40, 0x5c, 0x62, 0x41,
+  0x41, 0x41, 0x62, 0x5c, 0x40, 0x40, 0x40, 0x00, 0x00, 0x00, 0x24, 0x24,
+  0x00, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3e, 0x02, 0x02, 0x3c, 0x00,
+  0xff, 0xff, 0xe2, 0x96, 0x92, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc2, 0xb0,
+  0xff, 0xff, 0xff, 0xff, 0xe2, 0x94, 0x98, 0xff, 0xe2, 0x94, 0x90, 0xff,
+  0xe2, 0x94, 0x8c, 0xff, 0xe2, 0x94, 0x94, 0xff, 0xe2, 0x94, 0xbc, 0xff,
+  0xff, 0xff, 0xe2, 0x94, 0x80, 0xff, 0xff, 0xff, 0xe2, 0x94, 0x9c, 0xff,
+  0xe2, 0x94, 0xa4, 0xff, 0xe2, 0x94, 0xb4, 0xff, 0xe2, 0x94, 0xac, 0xff,
+  0xe2, 0x94, 0x82, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc2, 0xa3, 0xff, 0xff,
+  0x20, 0xff, 0x21, 0xff, 0x22, 0xff, 0x23, 0xff, 0x24, 0xff, 0x25, 0xff,
+  0x26, 0xff, 0x27, 0xff, 0x28, 0xff, 0x29, 0xff, 0x2a, 0xff, 0x2b, 0xff,
+  0x2c, 0xff, 0x2d, 0xff, 0x2e, 0xff, 0x2f, 0xff, 0x30, 0xff, 0x31, 0xff,
+  0x32, 0xff, 0x33, 0xff, 0x34, 0xff, 0x35, 0xff, 0x36, 0xff, 0x37, 0xff,
+  0x38, 0xff, 0x39, 0xff, 0x3a, 0xff, 0x3b, 0xff, 0x3c, 0xff, 0x3d, 0xff,
+  0x3e, 0xff, 0x3f, 0xff, 0x40, 0xff, 0x41, 0xff, 0x42, 0xff, 0x43, 0xff,
+  0x44, 0xff, 0x45, 0xff, 0x46, 0xff, 0x47, 0xff, 0x48, 0xff, 0x49, 0xff,
+  0x4a, 0xff, 0x4b, 0xff, 0x4c, 0xff, 0x4d, 0xff, 0x4e, 0xff, 0x4f, 0xff,
+  0x50, 0xff, 0x51, 0xff, 0x52, 0xff, 0x53, 0xff, 0x54, 0xff, 0x55, 0xff,
+  0x56, 0xff, 0x57, 0xff, 0x58, 0xff, 0x59, 0xff, 0x5a, 0xff, 0x5b, 0xff,
+  0x5c, 0xff, 0x5d, 0xff, 0x5e, 0xff, 0x5f, 0xff, 0x60, 0xff, 0x61, 0xff,
+  0x62, 0xff, 0x63, 0xff, 0x64, 0xff, 0x65, 0xff, 0x66, 0xff, 0x67, 0xff,
+  0x68, 0xff, 0x69, 0xff, 0x6a, 0xff, 0x6b, 0xff, 0x6c, 0xff, 0x6d, 0xff,
+  0x6e, 0xff, 0x6f, 0xff, 0x70, 0xff, 0x71, 0xff, 0x72, 0xff, 0x73, 0xff,
+  0x74, 0xff, 0x75, 0xff, 0x76, 0xff, 0x77, 0xff, 0x78, 0xff, 0x79, 0xff,
+  0x7a, 0xff, 0x7b, 0xff, 0x7c, 0xff, 0x7d, 0xff, 0x7e, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc2, 0xa0, 0xff, 0xc2, 0xa1,
+  0xff, 0xc2, 0xa2, 0xff, 0xc2, 0xa3, 0xff, 0xc2, 0xa4, 0xff, 0xc2, 0xa5,
+  0xff, 0xc2, 0xa6, 0xff, 0xff, 0xc2, 0xa8, 0xff, 0xc2, 0xa9, 0xff, 0xff,
+  0xc2, 0xab, 0xff, 0xff, 0xc2, 0xad, 0xff, 0xff, 0xff, 0xc2, 0xb0, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc2, 0xb8, 0xff, 0xff, 0xff,
+  0xc2, 0xbb, 0xff, 0xff, 0xff, 0xff, 0xc2, 0xbf, 0xff, 0xc3, 0x80, 0xff,
+  0xc3, 0x81, 0xff, 0xc3, 0x82, 0xff, 0xc3, 0x83, 0xff, 0xc3, 0x84, 0xff,
+  0xc3, 0x85, 0xff, 0xc3, 0x86, 0xff, 0xc3, 0x87, 0xff, 0xc3, 0x88, 0xff,
+  0xc3, 0x89, 0xff, 0xc3, 0x8a, 0xff, 0xc3, 0x8b, 0xff, 0xc3, 0x8c, 0xff,
+  0xc3, 0x8d, 0xff, 0xc3, 0x8e, 0xff, 0xc3, 0x8f, 0xff, 0xc3, 0x90, 0xff,
+  0xc3, 0x91, 0xff, 0xc3, 0x92, 0xff, 0xc3, 0x93, 0xff, 0xc3, 0x94, 0xff,
+  0xc3, 0x95, 0xff, 0xc3, 0x96, 0xff, 0xc3, 0x97, 0xff, 0xc3, 0x98, 0xff,
+  0xc3, 0x99, 0xff, 0xc3, 0x9a, 0xff, 0xc3, 0x9b, 0xff, 0xc3, 0x9c, 0xff,
+  0xc3, 0x9d, 0xff, 0xc3, 0x9e, 0xff, 0xc3, 0x9f, 0xff, 0xc3, 0xa0, 0xff,
+  0xc3, 0xa1, 0xff, 0xc3, 0xa2, 0xff, 0xc3, 0xa3, 0xff, 0xc3, 0xa4, 0xff,
+  0xc3, 0xa5, 0xff, 0xc3, 0xa6, 0xff, 0xc3, 0xa7, 0xff, 0xc3, 0xa8, 0xff,
+  0xc3, 0xa9, 0xff, 0xc3, 0xaa, 0xff, 0xc3, 0xab, 0xff, 0xc3, 0xac, 0xff,
+  0xc3, 0xad, 0xff, 0xc3, 0xae, 0xff, 0xc3, 0xaf, 0xff, 0xc3, 0xb0, 0xff,
+  0xc3, 0xb1, 0xff, 0xc3, 0xb2, 0xff, 0xc3, 0xb3, 0xff, 0xc3, 0xb4, 0xff,
+  0xc3, 0xb5, 0xff, 0xc3, 0xb6, 0xff, 0xc3, 0xb7, 0xff, 0xc3, 0xb8, 0xff,
+  0xc3, 0xb9, 0xff, 0xc3, 0xba, 0xff, 0xc3, 0xbb, 0xff, 0xc3, 0xbc, 0xff,
+  0xc3, 0xbd, 0xff, 0xc3, 0xbe, 0xff, 0xc3, 0xbf, 0xff

src/drivers/fb/font.cpp

@@ -1,6 +1,7 @@
-#include "kutil/assert.h"
+#include <assert.h>
 #include "font.h"
 
+
 /* PSF2 header format
  * Taken from the Linux KBD documentation
  * http://www.win.tue.nl/~aeb/linux/kbd/font-formats-1.html
@@ -27,43 +28,51 @@ struct psf2_header {
 	uint32_t height, width; // max dimensions of glyphs
 };
 
+const uint8_t default_font[] = {
+// xxd -i < font_file.psf > default_font.inc
+#include "default_font.inc"
+};
 
 font::font(void const *data) :
-	m_size(0, 0),
-	m_count(0),
-	m_data(nullptr)
+	m_sizex {0},
+	m_sizey {0},
+	m_count {0},
+	m_data {nullptr}
 {
+	if (!data)
+		data = default_font;
+
 	psf2_header const *psf2 = static_cast<psf2_header const *>(data);
 	for (int i = 0; i < sizeof(magic); ++i) {
-		kassert(psf2->magic[i] == magic[i], "Bad font magic number.");
+		assert(psf2->magic[i] == magic[i] && "Bad font magic number.");
 	}
 
 	m_data = static_cast<uint8_t const *>(data) + psf2->header_size;
-	m_size.x = psf2->width;
-	m_size.y = psf2->height;
+	m_sizex = psf2->width;
+	m_sizey = psf2->height;
 	m_count = psf2->length;
 }
 
 void
 font::draw_glyph(
-		screen *s,
+		screen &s,
 		uint32_t glyph,
 		screen::pixel_t fg,
 		screen::pixel_t bg,
 		unsigned x,
 		unsigned y) const
 {
-	unsigned bwidth = (m_size.x+7)/8;
+	unsigned bwidth = (m_sizex+7)/8;
 	uint8_t const *data = m_data + (glyph * glyph_bytes());
 
-	for (int dy = 0; dy < m_size.y; ++dy) {
+	for (int dy = 0; dy < m_sizey; ++dy) {
 		for (int dx = 0; dx < bwidth; ++dx) {
 			uint8_t byte = data[dy * bwidth + dx];
 			for (int i = 0; i < 8; ++i) {
-				if (dx*8 + i >= m_size.x) continue;
+				if (dx*8 + i >= m_sizex) break;
 				const uint8_t mask = 1 << (7-i);
 				uint32_t c = (byte & mask) ? fg : bg;
-				s->draw_pixel(x + dx*8 + i, y + dy, c);
+				s.draw_pixel(x + dx*8 + i, y + dy, c);
 			}
 		}
 	}

src/drivers/fb/font.h

@@ -0,0 +1,33 @@
+#pragma once
+#include <stdint.h>
+
+#include "screen.h"
+
+class font
+{
+public:
+	/// Constructor.
+	/// \arg data  The font data to load. If null, will load the default
+	///            built-in font.
+	font(void const *data = nullptr);
+
+	unsigned glyph_bytes() const { return m_sizey * ((m_sizex + 7) / 8); }
+	unsigned count() const { return m_count; }
+	unsigned width() const { return m_sizex; }
+	unsigned height() const { return m_sizey; }
+	bool valid() const { return m_count > 0; }
+
+	void draw_glyph(
+			screen &s,
+			uint32_t glyph,
+			screen::pixel_t fg,
+			screen::pixel_t bg,
+			unsigned x,
+			unsigned y) const;
+
+private:
+	unsigned m_sizex, m_sizey;
+	unsigned m_count;
+	uint8_t const *m_data;
+};
+

src/drivers/fb/main.cpp

@@ -0,0 +1,105 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "j6/init.h"
+#include "j6/errors.h"
+#include "j6/signals.h"
+#include "j6/types.h"
+
+#include <j6libc/syscalls.h>
+
+#include "font.h"
+#include "screen.h"
+#include "scrollback.h"
+
+extern "C" {
+	int main(int, const char **);
+	void _get_init(size_t *initc, struct j6_init_value **initv);
+}
+
+extern j6_handle_t __handle_sys;
+
+struct entry
+{
+	uint8_t bytes;
+	uint8_t area;
+	uint8_t severity;
+	uint8_t sequence;
+	char message[0];
+};
+
+int
+main(int argc, const char **argv)
+{
+	_syscall_system_log("fb driver starting");
+
+	size_t initc = 0;
+	j6_init_value *initv = nullptr;
+	_get_init(&initc, &initv);
+
+	j6_init_framebuffer *fb = nullptr;
+	for (unsigned i = 0; i < initc; ++i) {
+		if (initv[i].type == j6_init_desc_framebuffer) {
+			fb = reinterpret_cast<j6_init_framebuffer*>(initv[i].value);
+			break;
+		}
+	}
+
+	if (!fb || fb->addr == nullptr) {
+		_syscall_system_log("fb driver didn't find a framebuffer, exiting");
+		return 1;
+	}
+
+	const screen::pixel_order order = (fb->flags & 1) ?
+		screen::pixel_order::bgr8 : screen::pixel_order::rgb8;
+
+	screen scr(fb->addr, fb->horizontal, fb->vertical, order);
+	font fnt;
+
+	screen::pixel_t fg = scr.color(0xb0, 0xb0, 0xb0);
+	screen::pixel_t bg = scr.color(49, 79, 128);
+	scr.fill(bg);
+	scr.update();
+
+	constexpr int margin = 2;
+	const unsigned xstride = (margin + fnt.width());
+	const unsigned ystride = (margin + fnt.height());
+	const unsigned rows = (scr.height() - margin) / ystride;
+	const unsigned cols = (scr.width() - margin) / xstride;
+
+	scrollback scroll(rows, cols);
+
+	int pending = 0;
+	constexpr int pending_threshold = 10;
+
+	char message_buffer[256];
+	while (true) {
+		size_t size = sizeof(message_buffer);
+		_syscall_system_get_log(__handle_sys, message_buffer, &size);
+		if (size != 0) {
+			entry *e = reinterpret_cast<entry*>(&message_buffer);
+
+			size_t eom = e->bytes - sizeof(entry);
+			e->message[eom] = 0;
+
+			scroll.add_line(e->message, eom);
+			if (++pending > pending_threshold) {
+				scroll.render(scr, fnt);
+				scr.update();
+				pending = 0;
+			}
+		} else {
+			if (pending) {
+				scroll.render(scr, fnt);
+				scr.update();
+				pending = 0;
+			}
+		}
+	}
+
+
+	_syscall_system_log("fb driver done, exiting");
+	return 0;
+}
+

src/drivers/fb/screen.cpp

@@ -0,0 +1,50 @@
+#include <stdlib.h>
+#include <string.h>
+#include "screen.h"
+
+screen::screen(void *addr, unsigned hres, unsigned vres, pixel_order order) :
+	m_fb(static_cast<pixel_t *>(addr)),
+	m_order(order),
+	m_resx(hres),
+	m_resy(vres)
+{
+	m_back = reinterpret_cast<pixel_t*>(malloc(hres*vres*sizeof(pixel_t)));
+}
+
+screen::pixel_t
+screen::color(uint8_t r, uint8_t g, uint8_t b) const
+{
+	switch (m_order) {
+	case pixel_order::bgr8:
+		return
+			(static_cast<uint32_t>(b) <<  0) |
+			(static_cast<uint32_t>(g) <<  8) |
+			(static_cast<uint32_t>(r) << 16);
+
+	case pixel_order::rgb8:
+		return
+			(static_cast<uint32_t>(r) <<  0) |
+			(static_cast<uint32_t>(g) <<  8) |
+			(static_cast<uint32_t>(b) << 16);
+	}
+}
+
+void
+screen::fill(pixel_t color)
+{
+	const size_t len = m_resx * m_resy;
+	for (size_t i = 0; i < len; ++i)
+		m_back[i] = color;
+}
+
+void
+screen::draw_pixel(unsigned x, unsigned y, pixel_t color)
+{
+	m_back[x + y * m_resx] = color;
+}
+
+void
+screen::update()
+{
+	memcpy(m_fb, m_back, m_resx*m_resy*sizeof(pixel_t));
+}

src/drivers/fb/screen.h

@@ -0,0 +1,30 @@
+#pragma once
+#include <stddef.h>
+#include <stdint.h>
+
+class screen
+{
+public:
+	using pixel_t = uint32_t;
+
+	enum class pixel_order : uint8_t { bgr8, rgb8, };
+
+	screen(void *addr, unsigned hres, unsigned vres, pixel_order order);
+
+	unsigned width() const { return m_resx; }
+	unsigned height() const { return m_resy; }
+
+	pixel_t color(uint8_t r, uint8_t g, uint8_t b) const;
+
+	void fill(pixel_t color);
+	void draw_pixel(unsigned x, unsigned y, pixel_t color);
+
+	void update();
+
+private:
+	pixel_t *m_fb, *m_back;
+	pixel_order m_order;
+	unsigned m_resx, m_resy;
+
+	screen() = delete;
+};

src/drivers/fb/scrollback.cpp

@@ -0,0 +1,56 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "font.h"
+#include "screen.h"
+#include "scrollback.h"
+
+scrollback::scrollback(unsigned lines, unsigned cols, unsigned margin) :
+	m_rows {lines},
+	m_cols {cols},
+	m_count {0},
+	m_margin {margin}
+{
+	m_data = reinterpret_cast<char*>(malloc(lines*cols));
+	m_lines = reinterpret_cast<char**>(malloc(lines*sizeof(char*)));
+	for (unsigned i = 0; i < lines; ++i)
+		m_lines[i] = &m_data[i*cols];
+
+	memset(m_data, ' ', lines*cols);
+}
+
+void
+scrollback::add_line(const char *line, size_t len)
+{
+	unsigned i = m_count++ % m_rows;
+
+	if (len > m_cols)
+		len = m_cols;
+
+	memcpy(m_lines[i], line, len);
+	if (len < m_cols)
+		memset(m_lines[i]+len, ' ', m_cols - len);
+}
+
+char *
+scrollback::get_line(unsigned i)
+{
+	return m_lines[(i+m_count)%m_rows];
+}
+
+void
+scrollback::render(screen &scr, font &fnt)
+{
+	screen::pixel_t fg = scr.color(0xb0, 0xb0, 0xb0);
+	screen::pixel_t bg = scr.color(49, 79, 128);
+
+	const unsigned xstride = (m_margin + fnt.width());
+	const unsigned ystride = (m_margin + fnt.height());
+
+	for (unsigned y = 0; y < m_rows; ++y) {
+		char *line = get_line(y);
+		for (unsigned x = 0; x < m_cols; ++x) {
+			fnt.draw_glyph(scr, line[x], fg, bg, m_margin+x*xstride, m_margin+y*ystride);
+		}
+	}
+}

src/drivers/fb/scrollback.h

@@ -0,0 +1,26 @@
+#pragma once
+/// \file scrollback.h
+
+class screen;
+class font;
+
+class scrollback
+{
+public:
+	scrollback(unsigned lines, unsigned cols, unsigned margin = 2);
+
+	void add_line(const char *line, size_t len);
+
+	char * get_line(unsigned i);
+
+	void render(screen &scr, font &fnt);
+
+private:
+	char *m_data;
+	char **m_lines;
+	unsigned m_rows, m_cols;
+	unsigned m_start;
+	unsigned m_count;
+	unsigned m_margin;
+};
+

src/drivers/nulldrv/main.cpp

@@ -11,7 +11,7 @@
 #include "serial.h"
 
 char inbuf[1024];
-j6_handle_t sys = j6_handle_invalid;
+extern j6_handle_t __handle_sys;
 j6_handle_t endp = j6_handle_invalid;
 
 extern "C" {
@@ -51,12 +51,6 @@ thread_proc()
 	_syscall_thread_exit(0);
 }
 
-void
-_init_libc(j6_process_init *init)
-{
-	sys = init->handles[0];
-}
-
 int
 main(int argc, const char **argv)
 {
@@ -65,6 +59,9 @@ main(int argc, const char **argv)
 
 	_syscall_system_log("main thread starting");
 
+	for (int i = 0; i < argc; ++i)
+		_syscall_system_log(argv[i]);
+
 	void *base = malloc(0x1000);
 	if (!base)
 		return 1;
@@ -97,7 +94,7 @@ main(int argc, const char **argv)
 	if (tag != 17)
 		_syscall_system_log("GOT WRONG TAG FROM SENDRECV");
 
-	result = _syscall_system_bind_irq(sys, endp, 3);
+	result = _syscall_system_bind_irq(__handle_sys, endp, 3);
 	if (result != j6_status_ok)
 		return result;
 

src/include/j6/init.h

@@ -0,0 +1,30 @@
+#pragma once
+/// \file init.h
+/// Types used in process and thread initialization
+
+#include <stdint.h>
+
+enum j6_init_type {					// `value` is a:
+	j6_init_handle_system,			// Handle to the system
+	j6_init_handle_process,			// Handle to this process
+	j6_init_handle_thread,			// Handle to this thread
+	j6_init_handle_space,			// Handle to this process' address space
+	j6_init_desc_framebuffer		// Pointer to a j6_init_framebuffer descriptor
+};
+
+struct j6_init_value {
+	enum j6_init_type type;
+	uint64_t value;
+};
+
+/// Structure defining a framebuffer.
+/// `flags` has the following bits:
+///   0-3:   Pixel layout. 0000: rgb8, 0001: bgr8
+struct j6_init_framebuffer {
+	void* addr;
+	size_t size;
+	uint32_t vertical;
+	uint32_t horizontal;
+	uint32_t scanline;
+	uint32_t flags;
+};

src/include/j6/types.h

@@ -18,6 +18,7 @@ typedef uint64_t j6_signal_t;
 typedef uint64_t j6_tag_t;
 
 #define j6_tag_system_flag    0x8000000000000000
+#define j6_tag_invalid        0x0000000000000000
 
 /// If all high bits except the last 16 are set, then the tag represents
 /// an IRQ.

src/include/kernel_args.h

@@ -11,8 +11,7 @@ constexpr uint32_t magic = 0x600dda7a;
 constexpr uint16_t version = 1;
 
 enum class mod_type : uint32_t {
-	symbol_table,
-	framebuffer
+	symbol_table
 };
 
 struct module {
@@ -21,6 +20,21 @@ struct module {
 	mod_type type;
 };
 
+enum class fb_type : uint16_t {
+	none,
+	rgb8,
+	bgr8
+};
+
+struct framebuffer {
+	uintptr_t phys_addr;
+	size_t size;
+	uint32_t vertical;
+	uint32_t horizontal;
+	uint16_t scanline;
+	fb_type type;
+};
+
 struct program {
 	uintptr_t phys_addr;
 	uintptr_t virt_addr;
@@ -30,10 +44,7 @@ struct program {
 
 enum class mem_type : uint32_t {
 	free,
-	args,
-	program,
-	module,
-	table,
+	pending,
 	acpi,
 	uefi_runtime,
 	mmio,
@@ -74,6 +85,8 @@ struct header {
 
 	void *runtime_services;
 	void *acpi_table;
+
+	framebuffer video;
 }
 __attribute__((aligned(alignof(max_align_t))));
 

src/include/syscalls.inc

@@ -1,6 +1,6 @@
 SYSCALL(0x00, system_log,        const char *)
 SYSCALL(0x01, system_noop,       void)
-SYSCALL(0x02, system_get_log,    j6_handle_t, j6_handle_t *)
+SYSCALL(0x02, system_get_log,    j6_handle_t, char *, size_t *)
 SYSCALL(0x03, system_bind_irq,   j6_handle_t, j6_handle_t, unsigned)
 
 SYSCALL(0x08, object_koid,       j6_handle_t, j6_koid_t *)

src/kernel/boot.s

@@ -14,8 +14,8 @@ _header:
 
 section .text
 align 16
-global _start:function (_start.end - _start)
-_start:
+global _kernel_start:function (_kernel_start.end - _kernel_start)
+_kernel_start:
 	cli
 
 	mov rsp, idle_stack_end

src/kernel/console.cpp

@@ -4,8 +4,6 @@
 #include "kutil/no_construct.h"
 #include "kutil/printf.h"
 #include "console.h"
-#include "font.h"
-#include "screen.h"
 #include "serial.h"
 
 
@@ -15,212 +13,12 @@ static kutil::no_construct<console> __g_console_storage;
 console &g_console = __g_console_storage.value;
 
 
-class console::screen_out
-{
-public:
-	screen_out(screen *s, font *f) :
-		m_font(f),
-		m_screen(s),
-		m_size(s->width() / f->width(), s->height() / f->height()),
-		m_fg(0xffffff),
-		m_bg(0),
-		m_first(0),
-		m_data(nullptr),
-		m_attrs(nullptr),
-		m_palette(nullptr)
-	{
-		const unsigned count = m_size.size();
-		const size_t attrs_size = 2 * count;
-
-		m_data = new char[count];
-		kutil::memset(m_data, 0, count);
-
-		m_palette = new screen::pixel_t[256];
-		fill_palette();
-
-		m_attrs = new uint16_t[count];
-		set_color(7, 0); // Grey on black default
-		for (unsigned i = 0; i < count; ++i) m_attrs[i] = m_attr;
-
-		repaint();
-	}
-
-	~screen_out()
-	{
-		delete [] m_data;
-		delete [] m_palette;
-		delete [] m_attrs;
-	}
-
-	void fill_palette()
-	{
-		unsigned index = 0;
-
-		// Manually add the 16 basic ANSI colors
-		m_palette[index++] = m_screen->color(0x00, 0x00, 0x00);
-		m_palette[index++] = m_screen->color(0xcd, 0x00, 0x00);
-		m_palette[index++] = m_screen->color(0x00, 0xcd, 0x00);
-		m_palette[index++] = m_screen->color(0xcd, 0xcd, 0x00);
-		m_palette[index++] = m_screen->color(0x00, 0x00, 0xee);
-		m_palette[index++] = m_screen->color(0xcd, 0x00, 0xcd);
-		m_palette[index++] = m_screen->color(0x00, 0xcd, 0xcd);
-		m_palette[index++] = m_screen->color(0xe5, 0xe5, 0xe5);
-		m_palette[index++] = m_screen->color(0x7f, 0x7f, 0x7f);
-		m_palette[index++] = m_screen->color(0xff, 0x00, 0x00);
-		m_palette[index++] = m_screen->color(0x00, 0xff, 0x00);
-		m_palette[index++] = m_screen->color(0xff, 0xff, 0x00);
-		m_palette[index++] = m_screen->color(0x00, 0x50, 0xff);
-		m_palette[index++] = m_screen->color(0xff, 0x00, 0xff);
-		m_palette[index++] = m_screen->color(0x00, 0xff, 0xff);
-		m_palette[index++] = m_screen->color(0xff, 0xff, 0xff);
-
-		// Build the high-color portion of the table
-		const uint32_t intensity[] = {0, 0x5f, 0x87, 0xaf, 0xd7, 0xff};
-		const uint32_t intensities = sizeof(intensity) / sizeof(uint32_t);
-
-		for (uint32_t r = 0; r < intensities; ++r) {
-			for (uint32_t g = 0; g < intensities; ++g) {
-				for (uint32_t b = 0; b < intensities; ++b) {
-					m_palette[index++] = m_screen->color(
-							intensity[r], intensity[g], intensity[b]);
-				}
-			}
-		}
-
-		// Build the greyscale portion of the table
-		for (uint8_t i = 0x08; i <= 0xee; i += 10)
-			m_palette[index++] = m_screen->color(i, i, i);
-	}
-
-	void repaint()
-	{
-		m_screen->fill(m_bg);
-		if (!m_data) return;
-
-		for (unsigned y = 0; y < m_size.y; ++y) {
-			const char *line = line_pointer(y);
-			const uint16_t *attrs = attr_pointer(y);
-			for (unsigned x = 0; x < m_size.x; ++x) {
-				const uint16_t attr = attrs[x];
-
-				set_color(static_cast<uint8_t>(attr),
-						static_cast<uint8_t>(attr >> 8));
-
-				m_font->draw_glyph(
-					m_screen,
-					line[x] ? line[x] : ' ',
-					m_fg,
-					m_bg,
-					x * m_font->width(),
-					y * m_font->height());
-			}
-		}
-	}
-
-	void scroll(unsigned lines)
-	{
-		if (!m_data) {
-			m_pos.x = 0;
-			m_pos.y = 0;
-		} else {
-			unsigned bytes = lines * m_size.x;
-			char *line = line_pointer(0);
-			for (unsigned i = 0; i < bytes; ++i)
-				*line++ = 0;
-
-			m_first = (m_first + lines) % m_size.y;
-			m_pos.y -= lines;
-		}
-		repaint();
-	}
-
-	void set_color(uint8_t fg, uint8_t bg)
-	{
-		m_bg = m_palette[bg];
-		m_fg = m_palette[fg];
-		m_attr = (bg << 8) | fg;
-	}
-
-	void putc(char c)
-	{
-		char *line = line_pointer(m_pos.y);
-		uint16_t *attrs = attr_pointer(m_pos.y);
-
-
-		switch (c) {
-		case '\t':
-			m_pos.x = (m_pos.x + 4) / 4 * 4;
-			break;
-
-		case '\r':
-			m_pos.x = 0;
-			break;
-
-		case '\n':
-			m_pos.x = 0;
-			m_pos.y++;
-			break;
-
-		default: {
-				if (line) line[m_pos.x] = c;
-				if (attrs) attrs[m_pos.x] = m_attr;
-
-				const unsigned x = m_pos.x * m_font->width();
-				const unsigned y = m_pos.y * m_font->height();
-				m_font->draw_glyph(m_screen, c, m_fg, m_bg, x, y);
-
-				m_pos.x++;
-			}
-		}
-
-		if (m_pos.x >= m_size.x) {
-			m_pos.x = m_pos.x % m_size.x;
-			m_pos.y++;
-		}
-
-		if (m_pos.y >= m_size.y) {
-			scroll(1);
-			line = line_pointer(m_pos.y);
-		}
-	}
-
-private:
-	char * line_pointer(unsigned line)
-	{
-		if (!m_data) return nullptr;
-		return m_data + ((m_first + line) % m_size.y) * m_size.x;
-	}
-
-	uint16_t * attr_pointer(unsigned line)
-	{
-		if (!m_attrs) return nullptr;
-		return m_attrs + ((m_first + line) % m_size.y) * m_size.x;
-	}
-
-	font *m_font;
-	screen *m_screen;
-
-	kutil::coord<unsigned> m_size;
-	kutil::coord<unsigned> m_pos;
-	screen::pixel_t m_fg, m_bg;
-	uint16_t m_attr;
-
-	size_t m_first;
-
-	char *m_data;
-	uint16_t *m_attrs;
-	screen::pixel_t *m_palette;
-};
-
-
 console::console() :
-	m_screen(nullptr),
 	m_serial(nullptr)
 {
 }
 
 console::console(serial_port *serial) :
-	m_screen(nullptr),
 	m_serial(serial)
 {
 	if (m_serial) {
@@ -239,9 +37,6 @@ console::echo()
 void
 console::set_color(uint8_t fg, uint8_t bg)
 {
-	if (m_screen)
-		m_screen->set_color(fg, bg);
-
 	if (m_serial) {
 		const char *fgseq = "\x1b[38;5;";
 		while (*fgseq)
@@ -276,8 +71,6 @@ console::puts(const char *message)
 void
 console::putc(char c)
 {
-	if (m_screen) m_screen->putc(c);
-
 	if (m_serial) {
 		if (c == '\n') m_serial->write('\r');
 		m_serial->write(c);
@@ -291,9 +84,3 @@ void console::vprintf(const char *fmt, va_list args)
 	vsnprintf_(buffer, buf_size, fmt, args);
 	puts(buffer);
 }
-
-void
-console::init_screen(screen *s, font *f)
-{
-	m_screen = new screen_out(s, f);
-}

src/kernel/console.h

@@ -2,9 +2,7 @@
 #include <stdarg.h>
 #include <stdint.h>
 
-class font;
 struct kernel_data;
-class screen;
 class serial_port;
 
 class console
@@ -35,13 +33,9 @@ public:
 
 	void echo();
 
-	void init_screen(screen *s, font *f);
-
 	static console * get();
 
 private:
-	class screen_out;
-	screen_out *m_screen;
 	serial_port *m_serial;
 };
 

src/kernel/cpu.cpp

@@ -1,116 +1,31 @@
 #include <stdint.h>
+#include "kutil/assert.h"
 #include "kutil/memory.h"
 #include "cpu.h"
+#include "cpu/cpu.h"
 #include "log.h"
 
 cpu_data bsp_cpu_data;
 
-static constexpr uint32_t cpuid_extended = 0x80000000;
-
-
-inline static void
-__cpuid(
-	uint32_t leaf,
-	uint32_t subleaf,
-	uint32_t *eax,
-	uint32_t *ebx = nullptr,
-	uint32_t *ecx = nullptr,
-	uint32_t *edx = nullptr)
-{
-	uint32_t a, b, c, d;
-	__asm__ __volatile__ ( "cpuid"
-			: "=a"(a), "=b"(b), "=c"(c), "=d"(d)
-			: "a"(leaf), "c"(subleaf)
-			);
-	if (eax) *eax = a;
-	if (ebx) *ebx = b;
-	if (ecx) *ecx = c;
-	if (edx) *edx = d;
-}
-
-cpu_id::cpu_id() :
-	m_features(0)
-{
-	__cpuid(0, 0,
-		&m_high_basic,
-		reinterpret_cast<uint32_t *>(&m_vendor_id[0]),
-		reinterpret_cast<uint32_t *>(&m_vendor_id[8]),
-		reinterpret_cast<uint32_t *>(&m_vendor_id[4]));
-
-	__cpuid(cpuid_extended, 0, &m_high_ext);
-
-	if (m_high_ext >= cpuid_extended + 4) {
-		__cpuid(cpuid_extended + 2, 0,
-			reinterpret_cast<uint32_t *>(&m_brand_name[0]),
-			reinterpret_cast<uint32_t *>(&m_brand_name[4]),
-			reinterpret_cast<uint32_t *>(&m_brand_name[8]),
-			reinterpret_cast<uint32_t *>(&m_brand_name[12]));
-		__cpuid(cpuid_extended + 3, 0,
-			reinterpret_cast<uint32_t *>(&m_brand_name[16]),
-			reinterpret_cast<uint32_t *>(&m_brand_name[20]),
-			reinterpret_cast<uint32_t *>(&m_brand_name[24]),
-			reinterpret_cast<uint32_t *>(&m_brand_name[28]));
-		__cpuid(cpuid_extended + 4, 0,
-			reinterpret_cast<uint32_t *>(&m_brand_name[32]),
-			reinterpret_cast<uint32_t *>(&m_brand_name[36]),
-			reinterpret_cast<uint32_t *>(&m_brand_name[40]),
-			reinterpret_cast<uint32_t *>(&m_brand_name[44]));
-	} else {
-		m_brand_name[0] = 0;
-	}
-}
-
-cpu_id::regs
-cpu_id::get(uint32_t leaf, uint32_t sub) const
-{
-	regs ret {0, 0, 0, 0};
-
-	if ((leaf & cpuid_extended) == 0 && leaf > m_high_basic) return ret;
-	if ((leaf & cpuid_extended) != 0 && leaf > m_high_ext) return ret;
-
-	__cpuid(leaf, sub, &ret.eax, &ret.ebx, &ret.ecx, &ret.edx);
-	return ret;
-}
-
 void
-cpu_id::validate()
+cpu_validate()
 {
-	bool fail = false;
-	uint32_t leaf = 0;
-	uint32_t sub = 0;
-	regs r;
+	cpu::cpu_id cpu;
 
-	log::info(logs::boot, "CPU: %s", brand_name());
-	log::debug(logs::boot, "    Vendor is %s", vendor_id());
+	log::info(logs::boot, "CPU: %s", cpu.brand_name());
+	log::debug(logs::boot, "    Vendor is %s", cpu.vendor_id());
 
-	log::debug(logs::boot, "    Higest basic CPUID: 0x%02x", highest_basic());
-	log::debug(logs::boot, "    Higest ext CPUID:   0x%02x", highest_ext() & ~cpuid_extended);
+	log::debug(logs::boot, "    Higest basic CPUID: 0x%02x", cpu.highest_basic());
+	log::debug(logs::boot, "    Higest ext CPUID:   0x%02x", cpu.highest_ext() & ~cpu::cpu_id::cpuid_extended);
 
-#define CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit) \
-	if (leaf != feat_leaf || sub != feat_sub) { \
-		leaf = feat_leaf; sub = feat_sub; r = get(leaf, sub); \
-	} \
-	if (r.regname & (1ull << bit)) \
-		m_features |= (1ull << static_cast<uint64_t>(cpu_feature::name)); \
-	log::debug(logs::boot, "    Supports %9s: %s", #name, (r.regname & (1ull << bit)) ? "yes" : "no");
+#define CPU_FEATURE_OPT(name, ...) \
+	log::debug(logs::boot, "    Supports %9s: %s", #name, cpu.has_feature(cpu::feature::name) ? "yes" : "no");
 
 #define CPU_FEATURE_REQ(name, feat_leaf, feat_sub, regname, bit) \
 	CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit); \
-	if ((r.regname & (1ull << bit)) == 0) { \
-		log::error(logs::boot, "CPU missing required feature " #name); \
-		fail = true; \
-	}
+	kassert(cpu.has_feature(cpu::feature::name), "Missing required CPU feature " #name );
 
-#include "cpu_features.inc"
+#include "cpu/features.inc"
 #undef CPU_FEATURE_OPT
 #undef CPU_FEATURE_REQ
-
-	if (fail)
-		log::fatal(logs::boot, "CPU not supported.");
-}
-
-bool
-cpu_id::has_feature(cpu_feature feat)
-{
-	return (m_features & (1 << static_cast<uint64_t>(feat))) != 0;
 }

src/kernel/cpu.h

@@ -27,69 +27,6 @@ struct cpu_data
 
 extern cpu_data bsp_cpu_data;
 
-/// Enum of the cpu features jsix cares about
-enum class cpu_feature {
-#define CPU_FEATURE_REQ(name, ...)  name,
-#define CPU_FEATURE_OPT(name, ...)  name,
-#include "cpu_features.inc"
-#undef CPU_FEATURE_OPT
-#undef CPU_FEATURE_REQ
-	max
-};
-
-class cpu_id
-{
-public:
-	/// CPUID result register values
-	struct regs {
-		union {
-			uint32_t reg[4];
-			uint32_t eax, ebx, ecx, edx;
-		};
-
-		/// Return true if bit |bit| of EAX is set
-		bool eax_bit(unsigned bit) { return (eax >> bit) & 0x1; }
-
-		/// Return true if bit |bit| of EBX is set
-		bool ebx_bit(unsigned bit) { return (ebx >> bit) & 0x1; }
-
-		/// Return true if bit |bit| of ECX is set
-		bool ecx_bit(unsigned bit) { return (ecx >> bit) & 0x1; }
-
-		/// Return true if bit |bit| of EDX is set
-		bool edx_bit(unsigned bit) { return (edx >> bit) & 0x1; }
-	};
-
-	cpu_id();
-
-	/// The the result of a given CPUID leaf/subleaf
-	/// \arg leaf     The leaf selector (initial EAX)
-	/// \arg subleaf  The subleaf selector (initial ECX)
-	/// \returns      A |regs| struct of the values retuned
-	regs get(uint32_t leaf, uint32_t sub = 0) const;
-
-	/// Get the name of the cpu vendor (eg, "GenuineIntel")
-	inline const char * vendor_id() const	{ return m_vendor_id; }
-
-	/// Get the brand name of this processor model
-	inline const char * brand_name() const	{ return m_brand_name; }
-
-	/// Get the highest basic CPUID leaf supported
-	inline uint32_t highest_basic() const	{ return m_high_basic; }
-
-	/// Get the highest extended CPUID leaf supported
-	inline uint32_t highest_ext() const		{ return m_high_ext; }
-
-	/// Validate the CPU supports the necessary options for jsix
-	void validate();
-
-	/// Return true if the CPU claims to support the given feature
-	bool has_feature(cpu_feature feat);
-
-private:
-	uint32_t m_high_basic;
-	uint32_t m_high_ext;
-	char m_vendor_id[13];
-	char m_brand_name[48];
-	uint64_t m_features;
-};
+// We already validated the required options in the bootloader,
+// but iterate the options and log about them.
+void cpu_validate();

src/kernel/font.h

@@ -1,33 +0,0 @@
-#pragma once
-#include <stdint.h>
-
-#include "kutil/coord.h"
-#include "screen.h"
-
-class font
-{
-public:
-	font(void const *data);
-
-	unsigned glyph_bytes() const { return m_size.y * ((m_size.x + 7) / 8); }
-	unsigned count() const { return m_count; }
-	unsigned width() const { return m_size.x; }
-	unsigned height() const { return m_size.y; }
-	bool valid() const { return m_count > 0; }
-
-	void draw_glyph(
-			screen *s,
-			uint32_t glyph,
-			screen::pixel_t fg,
-			screen::pixel_t bg,
-			unsigned x,
-			unsigned y) const;
-
-private:
-	kutil::coord<unsigned> m_size;
-	unsigned m_count;
-	uint8_t const *m_data;
-
-	font() = delete;
-};
-

src/kernel/log.cpp

@@ -10,7 +10,7 @@ static uint8_t log_buffer[0x10000];
 // so that we can start log output immediately. Keep its constructor
 // from being called here so as to not overwrite the previous initialization.
 static kutil::no_construct<log::logger> __g_logger_storage;
-static log::logger &g_logger = __g_logger_storage.value;
+log::logger &g_logger = __g_logger_storage.value;
 
 static const uint8_t level_colors[] = {0x07, 0x07, 0x0f, 0x0b, 0x09};
 
@@ -57,3 +57,8 @@ void logger_init()
 {
 	new (&g_logger) log::logger(log_buffer, sizeof(log_buffer), output_log);
 }
+
+void logger_clear_immediate()
+{
+	g_logger.set_immediate(nullptr);
+}

src/kernel/log.h

@@ -6,4 +6,5 @@ namespace log = kutil::log;
 namespace logs = kutil::logs;
 
 void logger_init();
+void logger_clear_immediate();
 void logger_task();

src/kernel/main.cpp

@@ -17,6 +17,7 @@
 #include "log.h"
 #include "objects/channel.h"
 #include "objects/event.h"
+#include "objects/thread.h"
 #include "scheduler.h"
 #include "serial.h"
 #include "symbol_table.h"
@@ -32,24 +33,18 @@ extern "C" {
 	void (*__ctors_end)(void);
 }
 
-void
-run_constructors()
-{
-	void (**p)(void) = &__ctors;
-	while (p < &__ctors_end) {
-		void (*ctor)(void) = *p++;
-		ctor();
-	}
-}
-
 extern void __kernel_assert(const char *, unsigned, const char *);
 
 /// Bootstrap the memory managers.
+void setup_pat();
 void memory_initialize_pre_ctors(kernel::args::header *kargs);
 void memory_initialize_post_ctors(kernel::args::header *kargs);
 
 using namespace kernel;
 
+/// TODO: not this. this is awful.
+args::framebuffer *fb = nullptr;
+
 void
 init_console()
 {
@@ -60,7 +55,16 @@ init_console()
 	cons->puts("jsix OS ");
 	cons->set_color(0x08, 0x00);
 	cons->puts(GIT_VERSION " booting...\n");
-	logger_init();
+}
+
+void
+run_constructors()
+{
+	void (**p)(void) = &__ctors;
+	while (p < &__ctors_end) {
+		void (*ctor)(void) = *p++;
+		ctor();
+	}
 }
 
 channel *std_out = nullptr;
@@ -107,7 +111,22 @@ void
 kernel_main(args::header *header)
 {
 	kutil::assert_set_callback(__kernel_assert);
+
 	init_console();
+	logger_init();
+
+	setup_pat();
+
+	bool has_video = false;
+	if (header->video.size > 0) {
+		has_video = true;
+		fb = memory::to_virtual<args::framebuffer>(reinterpret_cast<uintptr_t>(&header->video));
+
+		const args::framebuffer &video = header->video;
+		log::debug(logs::boot, "Framebuffer: %dx%d[%d] type %s @ %016llx",
+			video.horizontal, video.vertical, video.scanline, video.type, video.phys_addr);
+		logger_clear_immediate();
+	}
 
 	gdt_init();
 	interrupts_init();
@@ -116,8 +135,7 @@ kernel_main(args::header *header)
 	run_constructors();
 	memory_initialize_post_ctors(header);
 
-	cpu_id cpu;
-	cpu.validate();
+	cpu_validate();
 
 	for (size_t i = 0; i < header->num_modules; ++i) {
 		args::module &mod = header->modules[i];
@@ -141,7 +159,6 @@ kernel_main(args::header *header)
 
 	interrupts_enable();
 	devices.init_drivers();
-
 	devices.get_lapic()->calibrate_timer();
 
 	/*
@@ -176,9 +193,13 @@ kernel_main(args::header *header)
 	// Skip program 0, which is the kernel itself
 	for (size_t i = 1; i < header->num_programs; ++i) {
 		args::program &prog = header->programs[i];
-		sched->load_process(prog.phys_addr, prog.virt_addr, prog.size, prog.entrypoint); 
+		thread *th = sched->load_process(prog.phys_addr, prog.virt_addr, prog.size, prog.entrypoint); 
+		if (i == 2) {
+			//th->set_state(thread::state::constant);
+		}
 	}
 
+	if (!has_video)
 		sched->create_kernel_task(logger_task, scheduler::max_priority-1, true);
 	sched->create_kernel_task(stdout_task, scheduler::max_priority-1, true);
 

src/kernel/memory_bootstrap.cpp

@@ -9,6 +9,7 @@
 #include "frame_allocator.h"
 #include "io.h"
 #include "log.h"
+#include "msr.h"
 #include "objects/process.h"
 #include "objects/vm_area.h"
 #include "vm_space.h"
@@ -100,6 +101,71 @@ void walk_page_table(
 }
 */
 
+static void
+log_mtrrs()
+{
+	uint64_t mtrrcap = rdmsr(msr::ia32_mtrrcap);
+	uint64_t mtrrdeftype = rdmsr(msr::ia32_mtrrdeftype);
+	unsigned vcap = mtrrcap & 0xff;
+	log::debug(logs::boot, "MTRRs: vcap=%d %s %s def=%02x %s %s",
+		vcap,
+		(mtrrcap & (1<< 8)) ? "fix" : "",
+		(mtrrcap & (1<<10)) ? "wc" : "",
+		mtrrdeftype & 0xff,
+		(mtrrdeftype & (1<<10)) ? "fe" : "",
+		(mtrrdeftype & (1<<11)) ? "enabled" : ""
+		);
+
+	for (unsigned i = 0; i < vcap; ++i) {
+		uint64_t base = rdmsr(find_mtrr(msr::ia32_mtrrphysbase, i));
+		uint64_t mask = rdmsr(find_mtrr(msr::ia32_mtrrphysmask, i));
+		log::debug(logs::boot, "       vcap[%2d] base:%016llx mask:%016llx type:%02x %s", i,
+			(base & ~0xfffull),
+			(mask & ~0xfffull),
+			(base & 0xff),
+			(mask & (1<<11)) ? "valid" : "");
+ 	}
+
+	msr mtrr_fixed[] = {
+		msr::ia32_mtrrfix64k_00000,
+		msr::ia32_mtrrfix16k_80000,
+		msr::ia32_mtrrfix16k_a0000,
+		msr::ia32_mtrrfix4k_c0000,
+		msr::ia32_mtrrfix4k_c8000,
+		msr::ia32_mtrrfix4k_d0000,
+		msr::ia32_mtrrfix4k_d8000,
+		msr::ia32_mtrrfix4k_e0000,
+		msr::ia32_mtrrfix4k_e8000,
+		msr::ia32_mtrrfix4k_f0000,
+		msr::ia32_mtrrfix4k_f8000,
+	};
+
+	for (int i = 0; i < 11; ++i) {
+		uint64_t v = rdmsr(mtrr_fixed[i]);
+		log::debug(logs::boot, "      fixed[%2d] %02x %02x %02x %02x %02x %02x %02x %02x", i,
+			((v <<  0) & 0xff), ((v <<  8) & 0xff), ((v << 16) & 0xff), ((v << 24) & 0xff),
+			((v << 32) & 0xff), ((v << 40) & 0xff), ((v << 48) & 0xff), ((v << 56) & 0xff));
+	}
+
+	uint64_t pat = rdmsr(msr::ia32_pat);
+	static const char *pat_names[] = {"UC ","WC ","XX ","XX ","WT ","WP ","WB ","UC-"};
+	log::debug(logs::boot, "      PAT: 0:%s 1:%s 2:%s 3:%s 4:%s 5:%s 6:%s 7:%s",
+		pat_names[(pat >> (0*8)) & 7], pat_names[(pat >> (1*8)) & 7],
+		pat_names[(pat >> (2*8)) & 7], pat_names[(pat >> (3*8)) & 7],
+		pat_names[(pat >> (4*8)) & 7], pat_names[(pat >> (5*8)) & 7],
+		pat_names[(pat >> (6*8)) & 7], pat_names[(pat >> (7*8)) & 7]);
+}
+
+void
+setup_pat()
+{
+	uint64_t pat = rdmsr(msr::ia32_pat);
+	pat = (pat & 0x00ffffffffffffffull) | (0x01ull << 56); // set PAT 7 to WC
+	wrmsr(msr::ia32_pat, pat);
+	log_mtrrs();
+}
+
+
 void
 memory_initialize_pre_ctors(args::header *kargs)
 {
@@ -110,6 +176,7 @@ memory_initialize_pre_ctors(args::header *kargs)
 	const size_t count = kargs->map_count;
 	for (unsigned i = 0; i < count; ++i) {
 		// TODO: use entry attributes
+		// TODO: copy anything we need from "pending" memory and free it
 		args::mem_entry &e = entries[i];
 		if (e.type == args::mem_type::free)
 			g_frame_allocator.free(e.start, e.pages);

src/kernel/msr.cpp

@@ -1,5 +1,11 @@
 #include "msr.h"
 
+msr
+find_mtrr(msr type, unsigned index)
+{
+	return static_cast<msr>(static_cast<uint32_t>(type) + (2 * index));
+}
+
 uint64_t
 rdmsr(msr addr)
 {

src/kernel/msr.h

@@ -6,6 +6,27 @@
 
 enum class msr : uint32_t
 {
+	ia32_mtrrcap           = 0x000000fe,
+	ia32_mtrrdeftype       = 0x000002ff,
+
+	ia32_mtrrphysbase      = 0x00000200,
+	ia32_mtrrphysmask      = 0x00000201,
+
+	ia32_mtrrfix64k_00000  = 0x00000250,
+
+	ia32_mtrrfix16k_80000  = 0x00000258,
+	ia32_mtrrfix16k_a0000  = 0x00000259,
+
+	ia32_mtrrfix4k_c0000   = 0x00000268,
+	ia32_mtrrfix4k_c8000   = 0x00000269,
+	ia32_mtrrfix4k_d0000   = 0x0000026A,
+	ia32_mtrrfix4k_d8000   = 0x0000026B,
+	ia32_mtrrfix4k_e0000   = 0x0000026C,
+	ia32_mtrrfix4k_e8000   = 0x0000026D,
+	ia32_mtrrfix4k_f0000   = 0x0000026E,
+	ia32_mtrrfix4k_f8000   = 0x0000026F,
+
+	ia32_pat               = 0x00000277,
 	ia32_efer              = 0xc0000080,
 	ia32_star              = 0xc0000081,
 	ia32_lstar             = 0xc0000082,
@@ -15,6 +36,9 @@ enum class msr : uint32_t
 	ia32_kernel_gs_base    = 0xc0000102
 };
 
+/// Find the msr for MTRR physical base or mask
+msr find_mtrr(msr type, unsigned index);
+
 /// Read the value of a MSR
 /// \arg addr  The MSR address
 /// \returns   The current value of the MSR

src/kernel/objects/process.cpp

@@ -21,13 +21,16 @@ process::process() :
 	m_state {state::running}
 {
 	s_processes.append(this);
+
+	j6_handle_t self = add_handle(this);
+	kassert(self == self_handle(), "Process self-handle is not 0");
 }
 
 // The "kernel process"-only constructor
 process::process(page_table *kpml4) :
 	kobject {kobject::type::process},
 	m_space {kpml4},
-	m_next_handle {0},
+	m_next_handle {self_handle()+1},
 	m_state {state::running}
 {
 }
@@ -52,16 +55,13 @@ void
 process::exit(unsigned code)
 {
 	// TODO: make this thread-safe
-	if (m_state != state::running)
-		return;
-	else
 	m_state = state::exited;
+	m_return_code = code;
+	close();
 
 	for (auto *thread : m_threads) {
 		thread->exit(code);
 	}
-	m_return_code = code;
-	close();
 
 	if (this == bsp_cpu_data.p)
 		scheduler::get().schedule();
@@ -120,6 +120,7 @@ process::thread_exited(thread *th)
 	kassert(&th->m_parent == this, "Process got thread_exited for non-child!");
 	uint32_t status = th->m_return_code;
 	m_threads.remove_swap(th);
+	remove_handle(th->self_handle());
 	delete th;
 
 	if (m_threads.count() == 0) {

src/kernel/objects/process.h

@@ -68,6 +68,9 @@ public:
 	/// \returns  True if this thread ending has ended the process
 	bool thread_exited(thread *th);
 
+	/// Get the handle for this process to refer to itself
+	inline j6_handle_t self_handle() const { return 0; }
+
 	/// Get the process object that owns kernel threads and the
 	/// kernel address space
 	static process & kernel_process();

src/kernel/objects/thread.cpp

@@ -26,6 +26,8 @@ thread::thread(process &parent, uint8_t pri, uintptr_t rsp0) :
 		setup_kernel_stack();
 	else
 		m_tcb.rsp0 = rsp0;
+
+	m_self_handle = parent.add_handle(this);
 }
 
 thread::~thread()

src/kernel/objects/thread.h

@@ -141,6 +141,9 @@ public:
 	/// \arg rip  The address to return to, must be user space
 	void add_thunk_user(uintptr_t rip);
 
+	/// Get the handle representing this thread to its process
+	j6_handle_t self_handle() const { return m_self_handle; }
+
 	/// Create the kernel idle thread
 	/// \arg kernel The process object that owns kernel tasks
 	/// \arg pri    The idle thread priority value
@@ -175,4 +178,6 @@ private:
 	uint64_t m_wait_data;
 	j6_status_t m_wait_result;
 	j6_koid_t m_wait_obj;
+
+	j6_handle_t m_self_handle;
 };

src/kernel/objects/vm_area.h

@@ -28,6 +28,9 @@ enum class vm_flags : uint32_t
 	large_pages     = 0x00000100,
 	huge_pages      = 0x00000200,
 
+	mmio            = 0x00010000,
+	write_combine   = 0x00020000,
+
 	user_mask       = 0x0000ffff  ///< flags allowed via syscall
 };
 

src/kernel/page_table.cpp

@@ -181,6 +181,7 @@ page_table::get_table_page()
 	s_page_cache = s_page_cache->next;
 	--s_cache_count;
 
+	kutil::memset(page, 0, memory::frame_size);
 	return reinterpret_cast<page_table*>(page);
 }
 

src/kernel/page_table.h

@@ -21,14 +21,21 @@ struct page_table
 		present   = 0x0001, /// Entry is present in the table
 		write     = 0x0002, /// Section may be written
 		user      = 0x0004, /// User-accessible
-		mtrr0     = 0x0008, /// MTRR selector bit 0
-		mtrr1     = 0x0010, /// MTRR selector bit 1
+		pat0      = 0x0008, /// PAT selector bit 0
+		pat1      = 0x0010, /// PAT selector bit 1
 		accessed  = 0x0020, /// Entry has been accessed
 		dirty     = 0x0040, /// Page has been written to
 		page      = 0x0080, /// Entry is a large page
-		pte_mtrr2 = 0x0080, /// MTRR selector bit 2 on PT entries
+		pat2      = 0x0080, /// PAT selector bit 2 on PT entries
 		global    = 0x0100, /// Entry is not PCID-specific
-		mtrr2     = 0x1000  /// MTRR selector bit 2 on PD and PDP entries
+		pat2_lg   = 0x1000, /// PAT selector bit 2 on large/huge pages
+
+		wb    = none,
+		wt    = pat0,
+		uc_   = pat1,
+		uc    = pat0 | pat1,
+		wc    = pat0 | pat1 | pat2,
+		wc_lg = pat0 | pat1 | pat2_lg,
 	};
 
 	/// Helper for getting the next level value

src/kernel/scheduler.cpp

@@ -1,5 +1,7 @@
 #include <stddef.h>
 
+#include <j6/init.h>
+
 #include "apic.h"
 #include "clock.h"
 #include "console.h"
@@ -17,11 +19,16 @@
 #include "objects/vm_area.h"
 #include "scheduler.h"
 
+// here for the framebuffer hack
+#include "kernel_args.h"
+
 #include "kutil/assert.h"
 
 
 scheduler *scheduler::s_instance = nullptr;
 
+extern kernel::args::framebuffer *fb;
+
 const uint64_t rflags_noint = 0x002;
 const uint64_t rflags_int = 0x202;
 
@@ -60,6 +67,14 @@ scheduler::scheduler(lapic *apic) :
 	bsp_cpu_data.t = idle;
 }
 
+template <typename T>
+inline T * push(uintptr_t &rsp, size_t size = sizeof(T)) {
+	rsp -= size;
+	T *p = reinterpret_cast<T*>(rsp);
+	rsp &= ~(sizeof(uint64_t)-1); // Align the stack
+	return p;
+}
+
 uintptr_t
 load_process_image(uintptr_t phys, uintptr_t virt, size_t bytes, TCB *tcb)
 {
@@ -69,25 +84,69 @@ load_process_image(uintptr_t phys, uintptr_t virt, size_t bytes, TCB *tcb)
 	// We're now in the process space for this process, allocate memory for the
 	// process code and load it
 	process &proc = process::current();
+	thread &th = thread::current();
 	vm_space &space = proc.space();
 
 	vm_area *vma = new vm_area_open(bytes, space, vm_flags::zero|vm_flags::write);
 	space.add(virt, vma);
 	vma->commit(phys, 0, memory::page_count(bytes));
 
-	tcb->rsp3 -= 2 * sizeof(uint64_t);
-	uint64_t *sentinel = reinterpret_cast<uint64_t*>(tcb->rsp3);
-	sentinel[0] = sentinel[1] = 0;
+	// double zero stack sentinel
+	*push<uint64_t>(tcb->rsp3) = 0;
+	*push<uint64_t>(tcb->rsp3) = 0;
 
-	tcb->rsp3 -= sizeof(j6_process_init);
-	j6_process_init *init = reinterpret_cast<j6_process_init*>(tcb->rsp3);
+	const char message[] = "Hello from the kernel!";
+	char *message_arg = push<char>(tcb->rsp3, sizeof(message));
+	kutil::memcpy(message_arg, message, sizeof(message));
 
-	init->process = proc.add_handle(&proc);
-	init->handles[0] = proc.add_handle(system::get());
-	init->handles[1] = j6_handle_invalid;
-	init->handles[2] = j6_handle_invalid;
+	j6_init_framebuffer *fb_desc = push<j6_init_framebuffer>(tcb->rsp3);
+	fb_desc->addr = fb ? reinterpret_cast<void*>(0x100000000) : nullptr;
+	fb_desc->size = fb ? fb->size : 0;
+	fb_desc->vertical = fb ? fb->vertical : 0;
+	fb_desc->horizontal = fb ? fb->horizontal : 0;
+	fb_desc->scanline = fb ? fb->scanline : 0;
+	fb_desc->flags = 0;
 
-	thread::current().clear_state(thread::state::loading);
+	if (fb && fb->type == kernel::args::fb_type::bgr8)
+		fb_desc->flags |= 1;
+
+	j6_init_value *initv = push<j6_init_value>(tcb->rsp3);
+	initv->type = j6_init_handle_system;
+	initv->value = static_cast<uint64_t>(proc.add_handle(system::get()));
+
+	initv = push<j6_init_value>(tcb->rsp3);
+	initv->type = j6_init_handle_process;
+	initv->value = static_cast<uint64_t>(proc.self_handle());
+
+	initv = push<j6_init_value>(tcb->rsp3);
+	initv->type = j6_init_handle_thread;
+	initv->value = static_cast<uint64_t>(th.self_handle());
+
+	initv = push<j6_init_value>(tcb->rsp3);
+	initv->type = j6_init_handle_space;
+	//initv->value = static_cast<uint64_t>(proc.add_handle(&space));
+
+	initv = push<j6_init_value>(tcb->rsp3);
+	initv->type = j6_init_desc_framebuffer;
+	initv->value = reinterpret_cast<uint64_t>(fb_desc);
+
+	uint64_t *initc = push<uint64_t>(tcb->rsp3);
+	*initc = 5;
+
+	char **argv0 = push<char*>(tcb->rsp3);
+	*argv0 = message_arg;
+
+	uint64_t *argc = push<uint64_t>(tcb->rsp3);
+	*argc = 1;
+
+	// Crazypants framebuffer part
+	if (fb) {
+		vma = new vm_area_open(fb->size, space, vm_flags::write|vm_flags::mmio|vm_flags::write_combine);
+		space.add(0x100000000, vma);
+		vma->commit(fb->phys_addr, 0, memory::page_count(fb->size));
+	}
+
+	th.clear_state(thread::state::loading);
 	return tcb->rsp3;
 }
 
@@ -107,7 +166,7 @@ scheduler::create_process(bool user)
 	return th;
 }
 
-void
+thread *
 scheduler::load_process(uintptr_t phys, uintptr_t virt, size_t size, uintptr_t entry)
 {
 
@@ -145,6 +204,8 @@ scheduler::load_process(uintptr_t phys, uintptr_t virt, size_t size, uintptr_t e
 	log::debug(logs::task, "     RSP  %016lx", tcb->rsp);
 	log::debug(logs::task, "     RSP0 %016lx", tcb->rsp0);
 	log::debug(logs::task, "     PML4 %016lx", tcb->pml4);
+
+	return th;
 }
 
 void

src/kernel/scheduler.h

@@ -45,7 +45,8 @@ public:
 	/// \arg virt  Virtual address of the loaded program image
 	/// \arg size  Size of the program image, in bytes
 	/// \arg entry Virtual address of the program entrypoint
-	void load_process(uintptr_t phys, uintptr_t virt, size_t size, uintptr_t entry);
+	/// \returns   The main thread of the loaded process
+	thread * load_process(uintptr_t phys, uintptr_t virt, size_t size, uintptr_t entry);
 
 	/// Create a new kernel task
 	/// \arg proc     Function to run as a kernel task

src/kernel/screen.cpp

@@ -1,70 +0,0 @@
-#include "screen.h"
-
-template <typename T>
-static int popcount(T x)
-{
-	int c = 0;
-	while (x) {
-		c += (x & 1);
-		x = x >> 1;
-	}
-	return c;
-}
-
-template <typename T>
-static int ctz(T x)
-{
-	int c = 0;
-	while ((x & 1) == 0) {
-		x = x >> 1;
-		++c;
-	}
-	return c;
-}
-
-screen::color_masks::color_masks(pixel_t r, pixel_t g, pixel_t b) :
-	r(r), g(g), b(b)
-{
-	rshift = static_cast<uint8_t>(ctz(r) - (8 - popcount(r)));
-	gshift = static_cast<uint8_t>(ctz(g) - (8 - popcount(g)));
-	bshift = static_cast<uint8_t>(ctz(b) - (8 - popcount(b)));
-}
-
-screen::color_masks::color_masks(const color_masks &o) :
-	rshift(o.rshift), gshift(o.gshift), bshift(o.bshift),
-	r(o.r), g(o.g), b(o.b)
-{
-}
-
-screen::screen(
-		void *framebuffer,
-		unsigned hres, unsigned vres,
-		pixel_t rmask, pixel_t gmask, pixel_t bmask) :
-	m_framebuffer(static_cast<pixel_t *>(framebuffer)),
-	m_masks(rmask, gmask, bmask),
-	m_resolution(hres, vres)
-{
-}
-
-screen::pixel_t
-screen::color(uint8_t r, uint8_t g, uint8_t b) const
-{
-	return
-		((static_cast<uint32_t>(r) << m_masks.rshift) & m_masks.r) |
-		((static_cast<uint32_t>(g) << m_masks.gshift) & m_masks.g) |
-		((static_cast<uint32_t>(b) << m_masks.bshift) & m_masks.b);
-}
-
-void
-screen::fill(pixel_t color)
-{
-	const size_t len = m_resolution.size();
-	for (size_t i = 0; i < len; ++i)
-		m_framebuffer[i] = color;
-}
-
-void
-screen::draw_pixel(unsigned x, unsigned y, pixel_t color)
-{
-	m_framebuffer[x + y * m_resolution.x] = color;
-}

src/kernel/screen.h

@@ -1,38 +0,0 @@
-#pragma once
-#include <stddef.h>
-#include <stdint.h>
-
-#include "kutil/coord.h"
-
-class screen
-{
-public:
-	using pixel_t = uint32_t;
-
-	screen(
-		void *framebuffer,
-		unsigned hres, unsigned vres,
-		pixel_t rmask, pixel_t gmask, pixel_t bmask);
-
-	unsigned width() const { return m_resolution.x; }
-	unsigned height() const { return m_resolution.y; }
-
-	pixel_t color(uint8_t r, uint8_t g, uint8_t b) const;
-
-	void fill(pixel_t color);
-	void draw_pixel(unsigned x, unsigned y, pixel_t color);
-
-private:
-	struct color_masks {
-		uint8_t rshift, gshift, bshift;
-		pixel_t r, g, b;
-		color_masks(pixel_t r, pixel_t g, pixel_t b);
-		color_masks(const color_masks &other);
-	};
-
-	pixel_t *m_framebuffer;
-	color_masks m_masks;
-	kutil::coord<unsigned> m_resolution;
-
-	screen() = delete;
-};

src/kernel/syscalls/endpoint.cpp

@@ -35,7 +35,12 @@ endpoint_receive(j6_handle_t handle, j6_tag_t *tag, size_t *len, void *data)
 	endpoint *e = get_handle<endpoint>(handle);
 	if (!e) return j6_err_invalid_arg;
 
-	return e->receive(tag, len, data);
+	j6_tag_t out_tag = j6_tag_invalid;
+	size_t out_len = 0;
+	j6_status_t s = e->receive(&out_tag, &out_len, data);
+	*tag = out_tag;
+	*len = out_len;
+	return s;
 }
 
 j6_status_t
@@ -51,7 +56,12 @@ endpoint_sendrecv(j6_handle_t handle, j6_tag_t *tag, size_t *len, void *data)
 	if (status != j6_status_ok)
 		return status;
 
-	return e->receive(tag, len, data);
+	j6_tag_t out_tag = j6_tag_invalid;
+	size_t out_len = 0;
+	j6_status_t s = e->receive(&out_tag, &out_len, data);
+	*tag = out_tag;
+	*len = out_len;
+	return s;
 }
 
 } // namespace syscalls

src/kernel/syscalls/system.cpp

@@ -7,6 +7,8 @@
 #include "objects/thread.h"
 #include "syscalls/helpers.h"
 
+extern log::logger &g_logger;
+
 namespace syscalls {
 
 j6_status_t
@@ -29,9 +31,10 @@ system_noop()
 }
 
 j6_status_t
-system_get_log(j6_handle_t sys, j6_handle_t *log)
+system_get_log(j6_handle_t sys, char *buffer, size_t *size)
 {
-	return j6_err_nyi;
+	*size = g_logger.get_entry(buffer, *size);
+	return j6_status_ok;
 }
 
 j6_status_t

src/kernel/syscalls/thread.cpp

@@ -15,7 +15,7 @@ thread_create(void *rip, j6_handle_t *handle)
 
 	thread *child = p.create_thread();
 	child->add_thunk_user(reinterpret_cast<uintptr_t>(rip));
-	*handle = p.add_handle(child);
+	*handle = p.self_handle();
 	child->clear_state(thread::state::loading);
 	child->set_state(thread::state::ready);
 

src/kernel/vm_mapper.cpp

@@ -30,6 +30,14 @@ vm_mapper_single::unmap(uintptr_t offset, size_t count)
 	m_space.clear(m_area, offset, count, true);
 }
 
+void
+vm_mapper_single::remove(vm_space *space)
+{
+	size_t count = memory::page_count(m_area.size());
+	bool keep = m_area.flags() && vm_flags::mmio;
+	m_space.clear(m_area, 0, count, !keep);
+}
+
 
 
 vm_mapper_multi::vm_mapper_multi(vm_area &area) :
@@ -88,11 +96,13 @@ void
 vm_mapper_multi::remove(vm_space *space)
 {
 	size_t count = memory::page_count(m_area.size());
+	bool keep = m_area.flags() && vm_flags::mmio;
 
 	for (int i = 0; i < m_spaces.count(); ++i) {
 		if (m_spaces[i] == space) {
 			m_spaces.remove_swap_at(i);
-			space->clear(m_area, 0, count, m_spaces.count() == 0);
+			keep &= m_spaces.count() > 0;
+			space->clear(m_area, 0, count, !keep);
 		}
 	}
 }

src/kernel/vm_mapper.h

@@ -54,6 +54,8 @@ public:
 
 	vm_space & space() { return m_space; }
 
+	virtual void remove(vm_space *space) override;
+
 private:
 	vm_area &m_area;
 	vm_space &m_space;

src/kernel/vm_space.cpp

@@ -170,13 +170,16 @@ vm_space::page_in(const vm_area &vma, uintptr_t offset, uintptr_t phys, size_t c
 	page_table::flag flags =
 		page_table::flag::present |
 		(m_kernel ? page_table::flag::none : page_table::flag::user) |
-		((vma.flags() && vm_flags::write) ? page_table::flag::write : page_table::flag::none);
+		((vma.flags() && vm_flags::write) ? page_table::flag::write : page_table::flag::none) |
+		((vma.flags() && vm_flags::write_combine) ? page_table::flag::wc : page_table::flag::none);
 
 	page_table::iterator it {virt, m_pml4};
 
 	for (size_t i = 0; i < count; ++i) {
-		it.entry(page_table::level::pt) =
-			(phys + i * frame_size) | flags;
+		uint64_t &entry = it.entry(page_table::level::pt);
+		entry = (phys + i * frame_size) | flags;
+		log::debug(logs::paging, "Setting entry for %016llx: %016llx [%04llx]",
+				it.vaddress(), (phys + i * frame_size), flags);
 		++it;
 	}
 }
@@ -210,7 +213,6 @@ vm_space::clear(const vm_area &vma, uintptr_t offset, size_t count, bool free)
 				free_start = phys;
 				free_count = 1;
 			}
-			fa.free(e & ~0xfffull, 1);
 		}
 
 		e = 0;

src/libraries/cpu/cpu.cpp

@@ -0,0 +1,97 @@
+#include <stdint.h>
+#include "cpu/cpu.h"
+
+namespace cpu {
+
+inline static void
+__cpuid(
+	uint32_t leaf,
+	uint32_t subleaf,
+	uint32_t *eax,
+	uint32_t *ebx = nullptr,
+	uint32_t *ecx = nullptr,
+	uint32_t *edx = nullptr)
+{
+	uint32_t a, b, c, d;
+	__asm__ __volatile__ ( "cpuid"
+			: "=a"(a), "=b"(b), "=c"(c), "=d"(d)
+			: "a"(leaf), "c"(subleaf)
+			);
+	if (eax) *eax = a;
+	if (ebx) *ebx = b;
+	if (ecx) *ecx = c;
+	if (edx) *edx = d;
+}
+
+cpu_id::cpu_id() :
+	m_features {0},
+	m_missing {0}
+{
+	__cpuid(0, 0,
+		&m_high_basic,
+		reinterpret_cast<uint32_t *>(&m_vendor_id[0]),
+		reinterpret_cast<uint32_t *>(&m_vendor_id[8]),
+		reinterpret_cast<uint32_t *>(&m_vendor_id[4]));
+
+	__cpuid(cpuid_extended, 0, &m_high_ext);
+
+	if (m_high_ext >= cpuid_extended + 4) {
+		__cpuid(cpuid_extended + 2, 0,
+			reinterpret_cast<uint32_t *>(&m_brand_name[0]),
+			reinterpret_cast<uint32_t *>(&m_brand_name[4]),
+			reinterpret_cast<uint32_t *>(&m_brand_name[8]),
+			reinterpret_cast<uint32_t *>(&m_brand_name[12]));
+		__cpuid(cpuid_extended + 3, 0,
+			reinterpret_cast<uint32_t *>(&m_brand_name[16]),
+			reinterpret_cast<uint32_t *>(&m_brand_name[20]),
+			reinterpret_cast<uint32_t *>(&m_brand_name[24]),
+			reinterpret_cast<uint32_t *>(&m_brand_name[28]));
+		__cpuid(cpuid_extended + 4, 0,
+			reinterpret_cast<uint32_t *>(&m_brand_name[32]),
+			reinterpret_cast<uint32_t *>(&m_brand_name[36]),
+			reinterpret_cast<uint32_t *>(&m_brand_name[40]),
+			reinterpret_cast<uint32_t *>(&m_brand_name[44]));
+	} else {
+		m_brand_name[0] = 0;
+	}
+
+	uint32_t leaf = -1u;
+	uint32_t sub = -1u;
+	regs r;
+#define CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit) \
+	if (leaf != feat_leaf || sub != feat_sub) { \
+		leaf = feat_leaf; sub = feat_sub; r = get(leaf, sub); \
+	} \
+	if (r.regname & (1ull << bit)) \
+		m_features |= (1ull << static_cast<uint64_t>(feature::name)); \
+
+#define CPU_FEATURE_REQ(name, feat_leaf, feat_sub, regname, bit) \
+	CPU_FEATURE_OPT(name, feat_leaf, feat_sub, regname, bit); \
+	if ((r.regname & (1ull << bit)) == 0) { \
+		m_missing |= (1ull << static_cast<uint64_t>(feature::name)); \
+	}
+
+#include "cpu/features.inc"
+#undef CPU_FEATURE_OPT
+#undef CPU_FEATURE_REQ
+}
+
+cpu_id::regs
+cpu_id::get(uint32_t leaf, uint32_t sub) const
+{
+	regs ret {0, 0, 0, 0};
+
+	if ((leaf & cpuid_extended) == 0 && leaf > m_high_basic) return ret;
+	if ((leaf & cpuid_extended) != 0 && leaf > m_high_ext) return ret;
+
+	__cpuid(leaf, sub, &ret.eax, &ret.ebx, &ret.ecx, &ret.edx);
+	return ret;
+}
+
+bool
+cpu_id::has_feature(feature feat)
+{
+	return (m_features & (1 << static_cast<uint64_t>(feat))) != 0;
+}
+
+}

src/libraries/cpu/include/cpu/cpu.h

@@ -0,0 +1,81 @@
+#pragma once
+/// \file cpu.h Definition of required cpu features for jsix
+
+#include <stdint.h>
+
+namespace cpu {
+
+/// Enum of the cpu features jsix cares about
+enum class feature {
+#define CPU_FEATURE_REQ(name, ...)  name,
+#define CPU_FEATURE_OPT(name, ...)  name,
+#include "cpu/features.inc"
+#undef CPU_FEATURE_OPT
+#undef CPU_FEATURE_REQ
+	max
+};
+
+class cpu_id
+{
+public:
+	static constexpr uint32_t cpuid_extended = 0x80000000;
+
+	/// CPUID result register values
+	struct regs {
+		union {
+			uint32_t reg[4];
+			uint32_t eax, ebx, ecx, edx;
+		};
+
+		/// Return true if bit |bit| of EAX is set
+		bool eax_bit(unsigned bit) { return (eax >> bit) & 0x1; }
+
+		/// Return true if bit |bit| of EBX is set
+		bool ebx_bit(unsigned bit) { return (ebx >> bit) & 0x1; }
+
+		/// Return true if bit |bit| of ECX is set
+		bool ecx_bit(unsigned bit) { return (ecx >> bit) & 0x1; }
+
+		/// Return true if bit |bit| of EDX is set
+		bool edx_bit(unsigned bit) { return (edx >> bit) & 0x1; }
+	};
+
+	cpu_id();
+
+	/// The the result of a given CPUID leaf/subleaf
+	/// \arg leaf     The leaf selector (initial EAX)
+	/// \arg subleaf  The subleaf selector (initial ECX)
+	/// \returns      A |regs| struct of the values retuned
+	regs get(uint32_t leaf, uint32_t sub = 0) const;
+
+	/// Get the name of the cpu vendor (eg, "GenuineIntel")
+	inline const char * vendor_id() const	{ return m_vendor_id; }
+
+	/// Get the brand name of this processor model
+	inline const char * brand_name() const	{ return m_brand_name; }
+
+	/// Get the highest basic CPUID leaf supported
+	inline uint32_t highest_basic() const	{ return m_high_basic; }
+
+	/// Get the highest extended CPUID leaf supported
+	inline uint32_t highest_ext() const		{ return m_high_ext; }
+
+	/// Get which required options are missing as flags
+	inline uint64_t missing() const         { return m_missing; }
+
+	/// Validate the CPU supports the necessary options for jsix
+	inline bool supported() const           { return m_missing; }
+
+	/// Return true if the CPU claims to support the given feature
+	bool has_feature(feature feat);
+
+private:
+	uint32_t m_high_basic;
+	uint32_t m_high_ext;
+	uint64_t m_features;
+	uint64_t m_missing;
+	char m_vendor_id[13];
+	char m_brand_name[48];
+};
+
+}

src/libraries/cpu/include/cpu/features.inc

@@ -7,8 +7,9 @@ CPU_FEATURE_REQ(pse,        0x00000001, 0, edx,  3)
 CPU_FEATURE_OPT(tsc,        0x00000001, 0, edx,  4)
 CPU_FEATURE_REQ(msr,        0x00000001, 0, edx,  5)
 CPU_FEATURE_REQ(apic,       0x00000001, 0, edx,  9)
+CPU_FEATURE_REQ(mtrr,       0x00000001, 0, edx, 12)
 CPU_FEATURE_REQ(pge,        0x00000001, 0, edx, 13)
-CPU_FEATURE_OPT(pat,        0x00000001, 0, edx, 16)
+CPU_FEATURE_REQ(pat,        0x00000001, 0, edx, 16)
 CPU_FEATURE_REQ(fxsr,       0x00000001, 0, edx, 24)
 
 CPU_FEATURE_OPT(fsgsbase,   0x00000007, 0, ebx,  0)

src/libraries/kutil/include/kutil/map.h

@@ -45,20 +45,6 @@ struct hash_node
 	inline uint64_t hash() const { return h; }
 };
 
-template <typename V>
-struct hash_node <uint64_t, V>
-{
-	uint64_t key;
-	V val;
-
-	hash_node(hash_node &&o) : key(std::move(o.key)), val(std::move(o.val)) {}
-	hash_node(uint64_t h, uint64_t &&k, V &&v) : key(std::move(k)), val(std::move(v)) {}
-	~hash_node() {}
-
-	inline uint64_t & hash() { return key; }
-	inline uint64_t hash() const { return key; }
-};
-
 /// Base class for hash maps
 template <typename K, typename V>
 class base_map

src/libraries/libc/arch/x86_64/crt0.s

@@ -1,24 +1,19 @@
-section .bss
-mymessage:
-	resq 1024
-
 extern main
-extern _init_libc
 extern exit
+extern _init_libc
 
-section .text
-
-global _start
+global _start:function (_start.end - _start)
 _start:
 	mov rbp, rsp
-
 	mov rdi, rsp
+
 	call _init_libc
 
-	mov rdi, 0
-	mov rsi, 0
+	pop rdi
+	mov rsi, rsp
 
 	call main
 
 	mov rdi, rax
 	call exit
+.end:

src/libraries/libc/arch/x86_64/init_libc.c

@@ -0,0 +1,36 @@
+#include <stdint.h>
+#include <j6/init.h>
+#include <j6/types.h>
+
+static size_t __initc = 0;
+static struct j6_init_value *__initv = 0;
+
+j6_handle_t __handle_sys = j6_handle_invalid;
+
+void
+_get_init(size_t *initc, struct j6_init_value **initv)
+{
+	if (!initc)
+		return;
+
+	*initc = __initc;
+	if (initv)
+		*initv = __initv;
+}
+
+void
+_init_libc(uint64_t *rsp)
+{
+	uint64_t argc = *rsp++;
+	rsp += argc;
+
+	__initc = *rsp++;
+	__initv = (struct j6_init_value *)rsp;
+
+	for (unsigned i = 0; i < __initc; ++i) {
+		if (__initv[i].type == j6_init_handle_system) {
+			__handle_sys = __initv[i].value;
+			break;
+		}
+	}
+}

src/libraries/libc/string/memcpy.c

@@ -10,9 +10,24 @@ void * memcpy( void * restrict s1, const void * restrict s2, size_t n )
 {
     char * dest = (char *) s1;
     const char * src = (const char *) s2;
-    while ( n-- )
-    {
+
+	if (((uintptr_t)src & 7) == ((uintptr_t)dest & 7)) {
+		while (((uintptr_t)src & 7) && n--)
 			*dest++ = *src++;
+
+		const uint64_t *srcq = (const uint64_t*)src;
+		uint64_t *destq = (uint64_t*)dest;
+		while (n >= 8) {
+			*destq++ = *srcq++;
+			n -= 8;
 		}
+
+		src = (const char*)srcq;
+		dest = (char*)destq;
+	}
+
+    while (n--)
+        *dest++ = *src++;
+
     return s1;
 }