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/* kernel.c - kernel functions */
#include <system.h>
#include <console.h>
extern unsigned char console_std_attr;
extern unsigned short console_cur_pos;
extern unsigned char console_flags;
unsigned char numprint = 0;
#define PRINT_ON if(numprint == 0) { \
asm("cli");\
console_cursor_off();\
}\
numprint++
#define PRINT_OFF numprint--;\
if(numprint == 0) {\
console_cursor_on();\
asm("sti");\
}
void print(unsigned char * text) {
print_attr(text, console_std_attr);
}
void print_attr(unsigned char * text, unsigned char attr) {
PRINT_ON;
while(*text) {
print_char_attr(*text, attr);
text++;
}
PRINT_OFF;
}
void print_char(unsigned char text) {
print_char_attr(text, console_std_attr);
}
void print_char_attr(unsigned char text, unsigned char attr) {
PRINT_ON;
switch(text) {
case 0x08: // backspace
if(console_cur_pos) console_cur_pos--;
break;
case 0x09: // tab
console_cur_pos += (8 - (console_cur_pos % 8));
break;
case 0x0A: // new line
console_cur_pos += (80 - (console_cur_pos % 80));
break;
case 0x0B: // home
case 0x0C: // form feed
console_cur_pos = 0;
asm(
"cld\n"
"mov $32,%%ax\n"
"mov %%ax,%%es\n"
"xor %%edi,%%edi\n"
"mov %0,%%ah\n"
"mov $0x20,%%al\n"
"mov $2000,%%ecx\n"
"rep stosw"
: : "m" (attr)
);
break;
case 0x0D: // carriage return
console_cur_pos -= (console_cur_pos % 80);
break;
default:
ANSI2ASCII(text);
asm(
"cld\n"
"mov $32,%%ax\n"
"mov %%ax,%%es\n"
"xor %%eax,%%eax\n"
"mov %0,%%ax\n"
"shl $1,%%eax\n"
"mov %%eax,%%edi\n"
"mov %1,%%al\n"
"mov %2,%%ah\n"
"stosw"
: : "m" (console_cur_pos), "m" (text), "m" (attr)
);
console_cur_pos++;
}
// scroll
if(console_cur_pos >= 2000) {
console_cur_pos -= 80;
asm(
"cld\n"
"push %%ds\n"
"mov $32,%%ax\n"
"mov %%ax,%%ds\n"
"mov %%ax,%%es\n"
"mov $1920,%%ecx\n"
"mov $160,%%esi\n"
"xor %%edi,%%edi\n"
"rep movsw\n"
"mov $80,%%cx\n"
"mov %%cs:%0,%%ah\n"
"mov $0x20,%%al\n"
"rep stosw\n"
"pop %%ds"
: : "m" (console_std_attr)
);
}
PRINT_OFF;
}
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