lib/vga.c


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#include <vga.h>
#include <stddef.h>

static uint16_t* vga_buffer BLSEC_DATA = VGA_MEMORY_ADDR;

void vga_setup(int xmax, int ymax)
{
	for (size_t i = 0; i < MAX_WIDTH; i++) {
		for (size_t j = 0; j < MAX_HEIGHT; j++) {
			vga_put(i, j, ' ', 0);
		}		
	}
}

uint8_t vga_color(uint8_t fg, uint8_t bg)
{
	return (uint8_t) fg | (uint8_t) bg << 4;
}

void vga_put(uint32_t x, uint32_t y, unsigned char uc, uint8_t color)
{
	vga_buffer[y*80+x] = (uint16_t) uc | (uint16_t) color << 8;
}