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VGA driver deprecated

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This commit is contained in:
Jarkko Toivanen 2023-09-22 17:42:46 +03:00
parent 5ee43c6e9f
commit 5e7356f58e
Signed by: jt
GPG key ID: 9151B109B73ECAD5
2 changed files with 0 additions and 121 deletions
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97
src/vga.c
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@ -1,97 +0,0 @@
#include "vga.h"
#define VGA_WIDTH 80
#define VGA_HEIGHT 25
#define VGA_MEM_ADDR 0xb8000
#define CURSOR_HOME (VGA_HEIGHT-1)*VGA_WIDTH
#define CURSOR_CHR 177;
unsigned int cursor_loc = CURSOR_HOME;
unsigned char fgcolor;
unsigned char bgcolor;
unsigned short blank;
static unsigned char vga_entry_color(enum vga_color fg, enum vga_color bg) {
return fg | bg << 4;
}
unsigned short vga_blank_entry() {
return vga_entry_color(fgcolor, bgcolor) << 8;
}
void draw_cursor(void) {
*((unsigned char *)VGA_MEM_ADDR + cursor_loc * 2) = CURSOR_CHR;
*((unsigned char *)VGA_MEM_ADDR+1 + cursor_loc * 2) = vga_entry_color(fgcolor, bgcolor);
}
void vga_set_color(enum vga_color fg, enum vga_color bg) {
fgcolor = fg;
bgcolor = bg;
}
void vga_init(enum vga_color fg, enum vga_color bg) {
vga_set_color(fg, bg);
blank = vga_blank_entry();
cls();
}
void cls(void) {
int i;
for (i=0; i<VGA_HEIGHT*VGA_WIDTH;i++) {
*((unsigned short *) VGA_MEM_ADDR+i) = blank;
}
}
void scroll(void) {
int y;
int x;
*((unsigned short *) VGA_MEM_ADDR+cursor_loc) = blank;
for (y=0;y<VGA_HEIGHT;y++) {
for (x = 0;x<VGA_WIDTH;x++) {
*((unsigned short *) VGA_MEM_ADDR+y*VGA_WIDTH+x) = *((unsigned short *) VGA_MEM_ADDR+(y+1)*VGA_WIDTH+x);
}
}
for (x=0;x<VGA_WIDTH;x++) {
*((unsigned short *) VGA_MEM_ADDR+CURSOR_HOME+x) = blank;
}
cursor_loc = CURSOR_HOME;
draw_cursor();
}
void putchar(unsigned char chr) {
if (chr == '\n') {
scroll();
return;
}
*((unsigned char *) VGA_MEM_ADDR+cursor_loc * 2) = chr;
*((unsigned char *) VGA_MEM_ADDR+1+cursor_loc * 2) = vga_entry_color(fgcolor, bgcolor);
cursor_loc++;
if (cursor_loc >= VGA_HEIGHT*VGA_WIDTH) {
scroll();
}
draw_cursor();
}
void vga_write(const char* text) {
int i = 0;
while(text[i]) {
putchar(text[i]);
i++;
}
}
void vga_write_color( const char* text, enum vga_color fg, enum vga_color bg) {
unsigned char prevfg = fgcolor;
unsigned char prevbg = bgcolor;
vga_set_color(fg, bg);
vga_write(text);
fgcolor = prevfg;
bgcolor = prevbg;
}
void vga_write_line(const char* text) {
if (cursor_loc != CURSOR_HOME) {
scroll();
}
vga_write(text);
scroll();
}
void vga_write_line_color(const char* text, enum vga_color fg, enum vga_color bg) {
unsigned char prevfg = fgcolor;
unsigned char prevbg = bgcolor;
vga_set_color(fg, bg);
vga_write_line(text);
fgcolor = prevfg;
bgcolor = prevbg;
}

24
src/vga.h
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@ -1,24 +0,0 @@
#ifndef HEADER_VGA
#define HEADER_VGA
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_ORANGE = 6,
VGA_COLOR_GREY = 7,
VGA_COLOR_GRAY = 7,
};
void cls(void);
void vga_init(enum vga_color fg, enum vga_color bg);
void vga_write(const char* text);
void vga_write_color( const char* text, enum vga_color fg, enum vga_color bg);
void vga_write_line(const char* text);
void vga_write_line_color( const char* text, enum vga_color fg, enum vga_color bg);
#endif