_Actually_ move the kernel to the last TiB.

More work on process page tables, including only mapping the last 2 pml4
entries (the highest 1TiB of the address space, ie, kernel space) into a
new table.

Includes the work of actually moving the kernel there, which I had
apparently done in name only previously. Oops.

src/kernel/gdt.cpp

@@ -113,6 +113,7 @@ tss_set_entry(uint8_t i, uint64_t base, uint64_t limit)
 	tssd.base_16 = (base >> 16) & 0xff;
 	tssd.base_24 = (base >> 24) & 0xff;
 	tssd.base_32 = (base >> 32) & 0xffffffff;
+	tssd.reserved = 0;
 
 	tssd.type =
 		gdt_type::accessed |

src/kernel/main.cpp

@@ -84,7 +84,6 @@ kernel_main(popcorn_data *header)
 			header->frame_buffer_length);
 
 	init_console(header);
-	// pager->dump_blocks();
 
 	device_manager *devices =
 		new (&device_manager::get()) device_manager(header->acpi_table);

src/kernel/memory_bootstrap.cpp

@@ -4,7 +4,7 @@
 #include "page_manager.h"
 
 const unsigned efi_page_size = 0x1000;
-const unsigned ident_page_flags = 0xf; // TODO: set to 0xb when user/kernel page tables are better sorted
+const unsigned ident_page_flags = 0xb;
 
 enum class efi_memory_type : uint32_t
 {
@@ -436,7 +436,7 @@ memory_initialize(const void *memory_map, size_t map_length, size_t desc_length)
 
 	// Offset-map this region into the higher half.
 	uint64_t free_region_start_virt =
-		free_region_start_phys + page_manager::high_offset;
+		free_region_start_phys + page_manager::page_offset;
 
 	uint64_t free_next = free_region_start_virt;
 

src/kernel/page_manager.cpp

@@ -227,7 +227,10 @@ page_table *
 page_manager::create_process_map()
 {
 	page_table *table = get_table_page();
-	kutil::memcpy(table, m_kernel_pml4, page_size);
+
+	kutil::memset(table, 0, page_size);
+	table->entries[510] = m_kernel_pml4->entries[510];
+	table->entries[511] = m_kernel_pml4->entries[511];
 
 	// Create the initial user stack
 	map_pages(

src/kernel/page_manager.h

@@ -21,7 +21,7 @@ public:
 	static const size_t page_size = 0x1000;
 
 	/// Start of the higher half.
-	static const addr_t high_offset = 0xffff800000000000;
+	static const addr_t high_offset = 0xffffff0000000000;
 
 	/// Offset from physical where page tables are mapped.
 	static const addr_t page_offset = 0xffffff8000000000;

src/kernel/scheduler.cpp

@@ -8,7 +8,8 @@
 #include "scheduler.h"
 
 scheduler scheduler::s_instance(nullptr);
-static const uint32_t quantum = 2000000;
+//static const uint32_t quantum = 2000000;
+static const uint32_t quantum =  20000000;
 
 const int stack_size = 0x1000;
 
@@ -42,7 +43,7 @@ create_process(uint16_t pid, void (*rip)())
 
 	state->ds = state->ss = ss;
 	state->cs = cs;
-	state->rflags = 0x202; // testing. TODO: 0x202
+	state->rflags = 0x202;
 	state->rip = reinterpret_cast<uint64_t>(rip);
 
 	page_table *pml4 = page_manager::get()->create_process_map();