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The PIC now correctly processes slave interrupts in XT mode as well, fixes PS/2 mouse on the Xi8088, fixes #2045.

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OBattler
2022-08-01 03:16:44 +02:00
parent 93404cf291
commit dc38b7d950
1 changed files with 15 additions and 0 deletions
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15
src/pic.c
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@@ -724,10 +724,25 @@ pic_irq_ack(void)
{
int ret;
/* Needed for Xi8088. */
if ((pic.ack_bytes == 0) && pic.int_pending && pic_slave_on(&pic, pic.interrupt)) {
if (!pic.slaves[pic.interrupt]->int_pending) {
/* If we are on AT, IRQ 2 is pending, and we cannot find a pending IRQ on PIC 2, fatal out. */
fatal("IRQ %i pending on AT without a pending IRQ on PIC %i (normal)\n", pic.interrupt, pic.interrupt);
exit(-1);
return -1;
}
pic.interrupt |= 0x40; /* Mark slave pending. */
}
ret = pic_irq_ack_read(&pic, pic.ack_bytes);
pic.ack_bytes = (pic.ack_bytes + 1) % (pic_i86_mode(&pic) ? 2 : 3);
if (pic.ack_bytes == 0) {
/* Needed for Xi8088. */
if (pic.interrupt & 0x40)
pic2.interrupt = 0x17;
pic.interrupt = 0x17;
update_pending();
}