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Test for incoming data pointer in kernel_main

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This commit is contained in:
Justin C. Miller
2018-03-29 09:49:38 -07:00
parent cc01f9d260
commit 7ce2898b6e
4 changed files with 4 additions and 122 deletions
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5
src/modules/main/debug.s
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@@ -3,9 +3,8 @@ section .text
global do_the_set_registers
do_the_set_registers:
mov rax, 0xdeadbeef0badc0de
mov rbx, 0xdeadbeef0badc0de
mov rcx, 0xdeadbeef0badc0de
mov rdx, 0xdeadbeef0badc0de
mov r8, rcx
mov r9, rdi
global _halt
_halt:

12
src/modules/main/main.c
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@@ -1,15 +1,7 @@
#include "vga.h"
void do_the_set_registers();
void
kernel_main()
kernel_main(void *header)
{
volatile register int foo = 0x1a1b1c10;
volatile register int bar = 0;
terminal_initialize(5);
terminal_writestring("YES HELLO THIS IS KERNEL");
do_the_set_registers();
do_the_set_registers(header);
}

67
src/modules/main/vga.c
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@@ -1,67 +0,0 @@
#include "vga.h"
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
static size_t terminal_row;
static size_t terminal_column;
static uint8_t terminal_color;
/* Note the use of the volatile keyword to prevent the compiler from eliminating dead stores. */
static volatile uint16_t *terminal_buffer;
uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg);
uint16_t vga_entry(unsigned char uc, uint8_t color);
static size_t
strlen(const char *str)
{
size_t len = 0;
while (str[len++])
;
return len;
}
void
terminal_initialize(size_t startrow)
{
terminal_row = startrow;
terminal_column = 0;
terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
terminal_buffer = (uint16_t *)0xB8000;
}
void
terminal_setcolor(uint8_t color)
{
terminal_color = color;
}
void
terminal_putentryat(char c, uint8_t color, size_t x, size_t y)
{
const size_t index = y * VGA_WIDTH + x;
terminal_buffer[index] = vga_entry(c, color);
}
void
terminal_putchar(char c)
{
terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
if (++terminal_column == VGA_WIDTH) {
terminal_column = 0;
if (++terminal_row == VGA_HEIGHT) terminal_row = 0;
}
}
void
terminal_write(const char *data, size_t size)
{
for (size_t i = 0; i < size; i++) terminal_putchar(data[i]);
}
void
terminal_writestring(const char *data)
{
terminal_write(data, strlen(data));
}

42
src/modules/main/vga.h
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@@ -1,42 +0,0 @@
#pragma once
#include <stddef.h>
#include <stdint.h>
/* Hardware text mode color constants. */
enum vga_color {
VGA_COLOR_BLACK = 0,
VGA_COLOR_BLUE = 1,
VGA_COLOR_GREEN = 2,
VGA_COLOR_CYAN = 3,
VGA_COLOR_RED = 4,
VGA_COLOR_MAGENTA = 5,
VGA_COLOR_BROWN = 6,
VGA_COLOR_LIGHT_GREY = 7,
VGA_COLOR_DARK_GREY = 8,
VGA_COLOR_LIGHT_BLUE = 9,
VGA_COLOR_LIGHT_GREEN = 10,
VGA_COLOR_LIGHT_CYAN = 11,
VGA_COLOR_LIGHT_RED = 12,
VGA_COLOR_LIGHT_MAGENTA = 13,
VGA_COLOR_LIGHT_BROWN = 14,
VGA_COLOR_WHITE = 15,
};
inline uint8_t
vga_entry_color(enum vga_color fg, enum vga_color bg)
{
return fg | bg << 4;
}
inline uint16_t
vga_entry(unsigned char uc, uint8_t color)
{
return (uint16_t)uc | (uint16_t)color << 8;
}
void terminal_initialize(size_t rowstart);
void terminal_setcolor(uint8_t color);
void terminal_putentryat(char c, uint8_t color, size_t x, size_t y);
void terminal_putchar(char c);
void terminal_write(const char *data, size_t size);
void terminal_writestring(const char *data);