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Reload GDT

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This commit is contained in:
Loic Guegan 2021-04-05 14:46:31 +02:00
parent b54b87ad2d
commit ba7e57138c
8 changed files with 182 additions and 19 deletions
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42
src/utils/print.c
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@ -1,24 +1,36 @@
#include "print.h"
#include "types.h"
#define MAX_COL 80
#define MAX_LINE 25
char *video=(char *)0xB8000;
u8 col=0;
u8 line=0;
struct VIDEO_STATE {
u8 *mem;
u8 col;
u8 line;
u8 bg;
u8 fg;
};
VIDEO_STATE VS={
(u8 *)0xB8000,
0,
0,
BLACK,
GRAY,
};
void putchar(char c){
// Print char
video[col*2+MAX_COL*line*2]=c;
VS.mem[VS.col*2+MAX_COL*VS.line*2]=c;
VS.mem[VS.col*2+MAX_COL*VS.line*2+1]=VS.fg|VS.bg<<4;
// Refresh location
col+=1;
if(col>= MAX_COL){
col=0;
line+=1;
if(line>=MAX_LINE){
line=MAX_LINE-1;
VS.col+=1;
if(VS.col>= MAX_COL){
VS.col=0;
VS.line+=1;
if(VS.line>=MAX_LINE){
VS.line=MAX_LINE-1;
scrollup();
}
}
@ -39,13 +51,13 @@ void clear(){
}
void scrollup(){
// Move line up
// Move VS.line up
for(char i=1;i<=MAX_LINE;i++){
for(char j=0;j<=MAX_COL;j++)
video[j*2+MAX_COL*(i-1)*2]=video[j*2+MAX_COL*i*2];
VS.mem[j*2+MAX_COL*(i-1)*2]=VS.mem[j*2+MAX_COL*i*2];
}
// Clear last line
// Clear last VS.line
for(char i=0;i<=MAX_COL;i++){
video[col*2+MAX_COL*(MAX_LINE-1)*2]='\0';
VS.mem[i*2+MAX_COL*(MAX_LINE-1)*2]='\0';
}
}