Add debug output and a few elementary stdlib functions.

1 files changed, 10 insertions, 122 deletions

diff --git a/kernel/l0/kmain.c b/kernel/l0/kmain.c
index 9139856..74945e4 100644
--- a/kernel/l0/kmain.c
+++ b/kernel/l0/kmain.c
@@ -1,126 +1,14 @@
-#if !defined(__cplusplus)
-#include <stdbool.h> /* C doesn't have booleans by default. */
-#endif
-#include <stddef.h>
-#include <stdint.h>
+#include <multiboot.h>
+#include <config.h>
+#include <dbglog.h>
+#include <sys.h>
  
-/* Check if the compiler thinks if we are targeting the wrong operating system. */
-#if defined(__linux__)
-#error "You are not using a cross-compiler, you will most certainly run into trouble"
-#endif
- 
-/* This tutorial will only work for the 32-bit ix86 targets. */
-#if !defined(__i386__)
-#error "This tutorial needs to be compiled with a ix86-elf compiler"
-#endif
+void kmain(struct multiboot_info_t *mbd, int32_t mb_magic) {
+	dbglog_setup();
 
-#include "multiboot.h"
- 
-extern void k_highhalf_addr;
+	dbg_printf("Hello, kernel World!\n");
+	dbg_printf("This is %s, version %s.\n", OS_NAME, OS_VERSION);
 
-/* Hardware text mode color constants. */
-enum vga_color
-{
-	COLOR_BLACK = 0,
-	COLOR_BLUE = 1,
-	COLOR_GREEN = 2,
-	COLOR_CYAN = 3,
-	COLOR_RED = 4,
-	COLOR_MAGENTA = 5,
-	COLOR_BROWN = 6,
-	COLOR_LIGHT_GREY = 7,
-	COLOR_DARK_GREY = 8,
-	COLOR_LIGHT_BLUE = 9,
-	COLOR_LIGHT_GREEN = 10,
-	COLOR_LIGHT_CYAN = 11,
-	COLOR_LIGHT_RED = 12,
-	COLOR_LIGHT_MAGENTA = 13,
-	COLOR_LIGHT_BROWN = 14,
-	COLOR_WHITE = 15,
-};
- 
-uint8_t make_color(enum vga_color fg, enum vga_color bg)
-{
-	return fg | bg << 4;
-}
- 
-uint16_t make_vgaentry(char c, uint8_t color)
-{
-	uint16_t c16 = c;
-	uint16_t color16 = color;
-	return c16 | color16 << 8;
-}
- 
-size_t strlen(const char* str)
-{
-	size_t ret = 0;
-	while ( str[ret] != 0 )
-		ret++;
-	return ret;
-}
- 
-static const size_t VGA_WIDTH = 80;
-static const size_t VGA_HEIGHT = 25;
- 
-size_t terminal_row;
-size_t terminal_column;
-uint8_t terminal_color;
-uint16_t* terminal_buffer;
- 
-void terminal_initialize()
-{
-	terminal_row = 0;
-	terminal_column = 0;
-	terminal_color = make_color(COLOR_LIGHT_GREY, COLOR_BLACK);
-	terminal_buffer = (uint16_t*) (&k_highhalf_addr + 0xB8000);
-	for ( size_t y = 0; y < VGA_HEIGHT; y++ )
-	{
-		for ( size_t x = 0; x < VGA_WIDTH; x++ )
-		{
-			const size_t index = y * VGA_WIDTH + x;
-			terminal_buffer[index] = make_vgaentry(' ', terminal_color);
-		}
-	}
-}
- 
-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] = make_vgaentry(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_writestring(const char* data)
-{
-	size_t datalen = strlen(data);
-	for ( size_t i = 0; i < datalen; i++ )
-		terminal_putchar(data[i]);
-}
- 
-#if defined(__cplusplus)
-extern "C" /* Use C linkage for kernel_main. */
-#endif
-void kmain(struct multiboot_info_t *mbd, int32_t mb_magic)
-{
-	terminal_initialize();
-	/* Since there is no support for newlines in terminal_putchar yet, \n will
-	   produce some VGA specific character instead. This is normal. */
-	terminal_writestring("Hello, kernel World!\n");
+	PANIC("Reached kmain end! Falling off the edge.");
 }
+