pjht/os
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add cursor to VGA driver

Browse Source
This commit is contained in:
pjht 2019-02-11 09:28:25 -06:00
parent cb16df6240
commit f1334567e1
1 changed files with 22 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/i386/vga.c
View File

@ -15,6 +15,22 @@ void vga_set_char(int x,int y,char c) {
screen[xy_to_indx(x,y)+1]=(bg_color<<4)|fg_color;
}
void vga_clear() {
for (int y=0;y<height;y++) {
for (int x=0;x<width;x++) {
vga_set_char(x,y,' ');
}
}
}
void set_cursor(int x,int y) {
int pos=(x+(y*width));
port_byte_out(0x3D4,0xF);
port_byte_out(0x3D5,pos&0xFF);
port_byte_out(0x3D4,0xE);
port_byte_out(0x3D5,(pos&0xFF00)>>8);
}
void vga_init(text_fb_info framebuffer_info) {
x=0;
y=0;
@ -23,17 +39,14 @@ void vga_init(text_fb_info framebuffer_info) {
screen=framebuffer_info.address;
width=framebuffer_info.width;
height=framebuffer_info.height;
port_byte_out(0x3D4,0xA);
port_byte_out(0x3D5,(port_byte_in(0x3D5)&0xC0)|14);
port_byte_out(0x3D4,0xB);
port_byte_out(0x3D5,(port_byte_in(0x3D5)&0xE0)|15);
set_cursor(0,0);
vga_clear();
}
void vga_clear() {
for (int y=0;y<height;y++) {
for (int x=0;x<width;x++) {
vga_set_char(x,y,' ');
}
}
}
void vga_write_string(const char* string) {
for (int i=0;i<strlen(string);i++) {
char c=string[i];
@ -57,4 +70,5 @@ void vga_write_string(const char* string) {
memcpy(&screen,pg1,xy_to_indx(0,25));
}
}
set_cursor(x,y);
}