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PIC spurious irq support (aka Solaris install bug) 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@838 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-05-20 16:12:05 +00:00
parent 28ab0e2edb
commit 15aeac3805
2 changed files with 29 additions and 23 deletions
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1
Changelog
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@ -14,6 +14,7 @@ version 0.5.6:
- dummy VGA PCI support
- VGA font selection fix (Daniel Serpell)
- PIC reset fix (Hidemi KAWAI)
- PIC spurious irq support (aka Solaris install bug)
version 0.5.5:

51
hw/i8259.c
View File

@ -49,7 +49,6 @@ typedef struct PicState {
/* 0 is master pic, 1 is slave pic */
static PicState pics[2];
static int pic_irq_requested;
/* set irq level. If an edge is detected, then the IRR is set to 1 */
static inline void pic_set_irq1(PicState *s, int irq, int level)
@ -130,13 +129,6 @@ static void pic_update_irq(void)
/* look at requested irq */
irq = pic_get_irq(&pics[0]);
if (irq >= 0) {
if (irq == 2) {
/* from slave pic */
pic_irq_requested = 8 + irq2;
} else {
/* from master pic */
pic_irq_requested = irq;
}
#if defined(DEBUG_PIC)
{
int i;
@ -192,8 +184,31 @@ int cpu_get_pic_interrupt(CPUState *env)
{
int irq, irq2, intno;
/* signal the pic that the irq was acked by the CPU */
irq = pic_irq_requested;
/* read the irq from the PIC */
irq = pic_get_irq(&pics[0]);
if (irq >= 0) {
pic_intack(&pics[0], irq);
if (irq == 2) {
irq2 = pic_get_irq(&pics[1]);
if (irq2 >= 0) {
pic_intack(&pics[1], irq2);
} else {
/* spurious IRQ on slave controller */
irq2 = 7;
}
intno = pics[1].irq_base + irq2;
irq = irq2 + 8;
} else {
intno = pics[0].irq_base + irq;
}
} else {
/* spurious IRQ on host controller */
irq = 7;
intno = pics[0].irq_base + irq;
}
pic_update_irq();
#ifdef DEBUG_IRQ_LATENCY
printf("IRQ%d latency=%0.3fus\n",
irq,
@ -202,17 +217,6 @@ int cpu_get_pic_interrupt(CPUState *env)
#if defined(DEBUG_PIC)
printf("pic_interrupt: irq=%d\n", irq);
#endif
if (irq >= 8) {
irq2 = irq & 7;
pic_intack(&pics[1], irq2);
irq = 2;
intno = pics[1].irq_base + irq2;
} else {
intno = pics[0].irq_base + irq;
}
pic_intack(&pics[0], irq);
pic_update_irq();
return intno;
}
@ -452,9 +456,10 @@ void pic_info(void)
for(i=0;i<2;i++) {
s = &pics[i];
term_printf("pic%d: irr=%02x imr=%02x isr=%02x hprio=%d irq_base=%02x rr_sel=%d elcr=%02x\n",
term_printf("pic%d: irr=%02x imr=%02x isr=%02x hprio=%d irq_base=%02x rr_sel=%d elcr=%02x fnm=%d\n",
i, s->irr, s->imr, s->isr, s->priority_add,
s->irq_base, s->read_reg_select, s->elcr);
s->irq_base, s->read_reg_select, s->elcr,
s->special_fully_nested_mode);
}
}