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Fix segment register issues in pit_sleep_and_quit_on_keypress()

This commit is contained in:
mintsuki 2020-06-01 07:51:06 +02:00
parent 4947a84591
commit b08abed015
2 changed files with 6 additions and 6 deletions
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qloader2.bin
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12
src/lib/blib.c
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@ -100,15 +100,11 @@ __attribute__((naked)) static void int_08_isr(void) {
asm (
".code16\n\t"
"pushf\n\t"
"push bx\n\t"
"mov ebx, dword ptr ds:[1f]\n\t"
"inc dword ptr ds:[ebx]\n\t"
"pop bx\n\t"
"inc dword ptr cs:[int_08_ticks_counter]\n\t"
"popf\n\t"
"int 0x40\n\t" // call callback
"iret\n\t"
".code32\n\t"
"1: .long int_08_ticks_counter\n\t"
);
}
@ -117,7 +113,7 @@ uint32_t *ivt = 0; // this variable is not static else gcc will optimise the
__attribute__((used)) static void hook_int_08(void) {
ivt[0x40] = ivt[0x08]; // int 0x40 is callback interrupt
ivt[0x08] = rm_seg(int_08_isr) << 16 | rm_off(int_08_isr);
ivt[0x08] = (uint16_t)(size_t)int_08_isr;
}
__attribute__((used)) static void dehook_int_08(void) {
@ -171,9 +167,13 @@ int pit_sleep_and_quit_on_keypress(uint32_t ticks) {
"cmp dword ptr ds:[ecx], edx\n\t"
"je 30f\n\t" // out on timeout
"push ecx\n\t"
"push edx\n\t"
"mov ah, 0x01\n\t"
"xor al, al\n\t"
"int 0x16\n\t"
"pop edx\n\t"
"pop ecx\n\t"
"jz 10b\n\t" // loop