92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
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#include <grub/text_fb_info.h>
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#include "vga.h"
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#include "ports.h"
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#include <string.h>
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#include <stddef.h>
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#define xy_to_indx(x,y) ((x+(y*width))*2)
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static char* screen;
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static int width;
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static int height;
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static int x;
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static int y;
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static vga_colors fg_color;
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static vga_colors bg_color;
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static char* scroll_buf[0xfa0];
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static void set_char(int x,int y,char c) {
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screen[xy_to_indx(x,y)]=c;
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screen[xy_to_indx(x,y)+1]=(bg_color<<4)|fg_color;
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}
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void vga_clear() {
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for (int y=0;y<height;y++) {
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for (int x=0;x<width;x++) {
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set_char(x,y,' ');
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}
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}
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}
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static void set_cursor(int x,int y) {
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int pos=(x+(y*width));
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port_byte_out(0x3D4,0xF);
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port_byte_out(0x3D5,pos&0xFF);
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port_byte_out(0x3D4,0xE);
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port_byte_out(0x3D5,(pos&0xFF00)>>8);
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}
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void vga_init(text_fb_info framebuffer_info) {
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x=0;
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y=0;
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fg_color=VGA_WHITE;
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bg_color=VGA_BLACK;
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screen=framebuffer_info.address;
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width=framebuffer_info.width;
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height=framebuffer_info.height;
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port_byte_out(0x3D4,0xA);
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port_byte_out(0x3D5,(port_byte_in(0x3D5)&0xC0)|14);
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port_byte_out(0x3D4,0xB);
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port_byte_out(0x3D5,(port_byte_in(0x3D5)&0xE0)|15);
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set_cursor(0,0);
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vga_clear();
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}
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void vga_write_string(const char* string) {
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for (size_t i=0;i<strlen(string);i++) {
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char c=string[i];
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if (c=='\n') {
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x=0;
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y++;
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wunused-value"
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for (int i=0;i<67108864;i++) {
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1+1;
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}
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#pragma GCC diagnostic pop
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} else {
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set_char(x,y,c);
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x++;
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}
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if (x==width) {
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x=0;
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y++;
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}
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if (y==height) {
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x=0;
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y=24;
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memcpy(scroll_buf,&screen[xy_to_indx(0,1)],xy_to_indx(0,24));
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vga_clear();
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memcpy(screen,scroll_buf,xy_to_indx(0,25));
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}
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}
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set_cursor(x,y);
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}
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void vga_backspace() {
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if (x!=0) {
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x--;
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set_char(x,y,' ');
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set_cursor(x,y);
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}
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}
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