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// MIT License, Copyright (c) 2021 Marvin Borner
#include <log.h>
#define VGA_WIDTH 80
#define VGA_HEIGHT 25
#define VGA_ADDRESS 0xb8000
void vga_clear(void)
{
u16 *out = (u16 *)VGA_ADDRESS;
for (u16 i = 0; i < 80 * 25; i++)
out[i] = 0;
}
void vga_put_at(char ch, u8 x, u8 y, u8 color)
{
u8 *out = (u8 *)(VGA_ADDRESS + 2 * (x + y * VGA_WIDTH));
*out++ = ch;
*out++ = color;
}
static void vga_put(char ch)
{
static u8 x = 0;
static u8 y = 0;
if (ch == '\n') {
x = 0;
y++;
return;
} else if (x + 1 == VGA_WIDTH) {
x = 0;
y++;
} else if (y + 1 == VGA_HEIGHT) {
x = 0;
y = 0;
vga_clear();
}
u8 *out = (u8 *)(VGA_ADDRESS + 2 * (x + y * VGA_WIDTH));
*out++ = ch;
*out++ = 0x07;
x++;
}
static void vga_print(const char *data)
{
for (const char *p = data; *p; p++)
vga_put(*p);
}
void vga_log(const char *format, ...)
{
char buf[1024] = { 0 };
va_list ap;
va_start(ap, format);
vsnprintf(buf, sizeof(buf), format, ap);
va_end(ap);
vga_print(buf);
}
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