/*
* QEMU 8259 interrupt controller emulation
- *
+ *
* Copyright (c) 2003-2004 Fabrice Bellard
- *
+ *
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
//#define DEBUG_PIC
//#define DEBUG_IRQ_LATENCY
+//#define DEBUG_IRQ_COUNT
typedef struct PicState {
uint8_t last_irr; /* edge detection */
uint8_t rotate_on_auto_eoi;
uint8_t special_fully_nested_mode;
uint8_t init4; /* true if 4 byte init */
+ uint8_t single_mode; /* true if slave pic is not initialized */
uint8_t elcr; /* PIIX edge/trigger selection*/
uint8_t elcr_mask;
+ PicState2 *pics_state;
} PicState;
-/* 0 is master pic, 1 is slave pic */
-static PicState pics[2];
-static int pic_irq_requested;
+struct PicState2 {
+ /* 0 is master pic, 1 is slave pic */
+ /* XXX: better separation between the two pics */
+ PicState pics[2];
+ qemu_irq parent_irq;
+ void *irq_request_opaque;
+ /* IOAPIC callback support */
+ SetIRQFunc *alt_irq_func;
+ void *alt_irq_opaque;
+};
+
+#if defined(DEBUG_PIC) || defined (DEBUG_IRQ_COUNT)
+static int irq_level[16];
+#endif
+#ifdef DEBUG_IRQ_COUNT
+static uint64_t irq_count[16];
+#endif
/* 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)
master, the IRQ coming from the slave is not taken into account
for the priority computation. */
mask = s->isr;
- if (s->special_fully_nested_mode && s == &pics[0])
+ if (s->special_fully_nested_mode && s == &s->pics_state->pics[0])
mask &= ~(1 << 2);
cur_priority = get_priority(s, mask);
if (priority < cur_priority) {
/* raise irq to CPU if necessary. must be called every time the active
irq may change */
-static void pic_update_irq(void)
+/* XXX: should not export it, but it is needed for an APIC kludge */
+void pic_update_irq(PicState2 *s)
{
int irq2, irq;
/* first look at slave pic */
- irq2 = pic_get_irq(&pics[1]);
+ irq2 = pic_get_irq(&s->pics[1]);
if (irq2 >= 0) {
/* if irq request by slave pic, signal master PIC */
- pic_set_irq1(&pics[0], 2, 1);
- pic_set_irq1(&pics[0], 2, 0);
+ pic_set_irq1(&s->pics[0], 2, 1);
+ pic_set_irq1(&s->pics[0], 2, 0);
}
/* look at requested irq */
- irq = pic_get_irq(&pics[0]);
+ irq = pic_get_irq(&s->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;
for(i = 0; i < 2; i++) {
- printf("pic%d: imr=%x irr=%x padd=%d\n",
- i, pics[i].imr, pics[i].irr, pics[i].priority_add);
-
+ printf("pic%d: imr=%x irr=%x padd=%d\n",
+ i, s->pics[i].imr, s->pics[i].irr,
+ s->pics[i].priority_add);
+
}
}
- printf("pic: cpu_interrupt req=%d\n", pic_irq_requested);
+ printf("pic: cpu_interrupt\n");
#endif
- cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
+ qemu_irq_raise(s->parent_irq);
+ }
+
+/* all targets should do this rather than acking the IRQ in the cpu */
+#if defined(TARGET_MIPS) || defined(TARGET_PPC)
+ else {
+ qemu_irq_lower(s->parent_irq);
}
+#endif
}
#ifdef DEBUG_IRQ_LATENCY
int64_t irq_time[16];
#endif
-#if defined(DEBUG_PIC)
-int irq_level[16];
-#endif
-void pic_set_irq(int irq, int level)
+void i8259_set_irq(void *opaque, int irq, int level)
{
-#if defined(DEBUG_PIC)
+ PicState2 *s = opaque;
+
+#if defined(DEBUG_PIC) || defined(DEBUG_IRQ_COUNT)
if (level != irq_level[irq]) {
- printf("pic_set_irq: irq=%d level=%d\n", irq, level);
+#if defined(DEBUG_PIC)
+ printf("i8259_set_irq: irq=%d level=%d\n", irq, level);
+#endif
irq_level[irq] = level;
+#ifdef DEBUG_IRQ_COUNT
+ if (level == 1)
+ irq_count[irq]++;
+#endif
}
#endif
#ifdef DEBUG_IRQ_LATENCY
if (level) {
- irq_time[irq] = cpu_get_ticks();
+ irq_time[irq] = qemu_get_clock(vm_clock);
}
#endif
- pic_set_irq1(&pics[irq >> 3], irq & 7, level);
- pic_update_irq();
+ pic_set_irq1(&s->pics[irq >> 3], irq & 7, level);
+ /* used for IOAPIC irqs */
+ if (s->alt_irq_func)
+ s->alt_irq_func(s->alt_irq_opaque, irq, level);
+ pic_update_irq(s);
}
/* acknowledge interrupt 'irq' */
} else {
s->isr |= (1 << irq);
}
- s->irr &= ~(1 << irq);
+ /* We don't clear a level sensitive interrupt here */
+ if (!(s->elcr & (1 << irq)))
+ s->irr &= ~(1 << irq);
}
-int cpu_get_pic_interrupt(CPUState *env)
+int pic_read_irq(PicState2 *s)
{
int irq, irq2, intno;
- /* signal the pic that the irq was acked by the CPU */
- irq = pic_irq_requested;
+ irq = pic_get_irq(&s->pics[0]);
+ if (irq >= 0) {
+ pic_intack(&s->pics[0], irq);
+ if (irq == 2) {
+ irq2 = pic_get_irq(&s->pics[1]);
+ if (irq2 >= 0) {
+ pic_intack(&s->pics[1], irq2);
+ } else {
+ /* spurious IRQ on slave controller */
+ irq2 = 7;
+ }
+ intno = s->pics[1].irq_base + irq2;
+ irq = irq2 + 8;
+ } else {
+ intno = s->pics[0].irq_base + irq;
+ }
+ } else {
+ /* spurious IRQ on host controller */
+ irq = 7;
+ intno = s->pics[0].irq_base + irq;
+ }
+ pic_update_irq(s);
+
#ifdef DEBUG_IRQ_LATENCY
- printf("IRQ%d latency=%0.3fus\n",
- irq,
- (double)(cpu_get_ticks() - irq_time[irq]) * 1000000.0 / ticks_per_sec);
+ printf("IRQ%d latency=%0.3fus\n",
+ irq,
+ (double)(qemu_get_clock(vm_clock) - irq_time[irq]) * 1000000.0 / ticks_per_sec);
#endif
#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;
}
+static void pic_reset(void *opaque)
+{
+ PicState *s = opaque;
+
+ s->last_irr = 0;
+ s->irr = 0;
+ s->imr = 0;
+ s->isr = 0;
+ s->priority_add = 0;
+ s->irq_base = 0;
+ s->read_reg_select = 0;
+ s->poll = 0;
+ s->special_mask = 0;
+ s->init_state = 0;
+ s->auto_eoi = 0;
+ s->rotate_on_auto_eoi = 0;
+ s->special_fully_nested_mode = 0;
+ s->init4 = 0;
+ s->single_mode = 0;
+ /* Note: ELCR is not reset */
+}
+
static void pic_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
PicState *s = opaque;
- int priority, cmd, irq, tmp;
+ int priority, cmd, irq;
#ifdef DEBUG_PIC
printf("pic_write: addr=0x%02x val=0x%02x\n", addr, val);
if (addr == 0) {
if (val & 0x10) {
/* init */
- tmp = s->elcr_mask;
- memset(s, 0, sizeof(PicState));
- s->elcr_mask = tmp;
-
+ pic_reset(s);
+ /* deassert a pending interrupt */
+ qemu_irq_lower(s->pics_state->parent_irq);
s->init_state = 1;
s->init4 = val & 1;
- if (val & 0x02)
- hw_error("single mode not supported");
+ s->single_mode = val & 2;
if (val & 0x08)
hw_error("level sensitive irq not supported");
} else if (val & 0x08) {
s->isr &= ~(1 << irq);
if (cmd == 5)
s->priority_add = (irq + 1) & 7;
- pic_update_irq();
+ pic_update_irq(s->pics_state);
}
break;
case 3:
irq = val & 7;
s->isr &= ~(1 << irq);
- pic_update_irq();
+ pic_update_irq(s->pics_state);
break;
case 6:
s->priority_add = (val + 1) & 7;
- pic_update_irq();
+ pic_update_irq(s->pics_state);
break;
case 7:
irq = val & 7;
s->isr &= ~(1 << irq);
s->priority_add = (irq + 1) & 7;
- pic_update_irq();
+ pic_update_irq(s->pics_state);
break;
default:
/* no operation */
case 0:
/* normal mode */
s->imr = val;
- pic_update_irq();
+ pic_update_irq(s->pics_state);
break;
case 1:
s->irq_base = val & 0xf8;
- s->init_state = 2;
+ s->init_state = s->single_mode ? (s->init4 ? 3 : 0) : 2;
break;
case 2:
if (s->init4) {
ret = pic_get_irq(s);
if (ret >= 0) {
if (addr1 >> 7) {
- pics[0].isr &= ~(1 << 2);
- pics[0].irr &= ~(1 << 2);
+ s->pics_state->pics[0].isr &= ~(1 << 2);
+ s->pics_state->pics[0].irr &= ~(1 << 2);
}
s->irr &= ~(1 << ret);
s->isr &= ~(1 << ret);
if (addr1 >> 7 || ret != 2)
- pic_update_irq();
+ pic_update_irq(s->pics_state);
} else {
ret = 0x07;
- pic_update_irq();
+ pic_update_irq(s->pics_state);
}
return ret;
}
/* memory mapped interrupt status */
-uint32_t pic_intack_read(CPUState *env)
+/* XXX: may be the same than pic_read_irq() */
+uint32_t pic_intack_read(PicState2 *s)
{
int ret;
- ret = pic_poll_read(&pics[0], 0x00);
+ ret = pic_poll_read(&s->pics[0], 0x00);
if (ret == 2)
- ret = pic_poll_read(&pics[1], 0x80) + 8;
+ ret = pic_poll_read(&s->pics[1], 0x80) + 8;
/* Prepare for ISR read */
- pics[0].read_reg_select = 1;
-
+ s->pics[0].read_reg_select = 1;
+
return ret;
}
static void pic_save(QEMUFile *f, void *opaque)
{
PicState *s = opaque;
-
+
qemu_put_8s(f, &s->last_irr);
qemu_put_8s(f, &s->irr);
qemu_put_8s(f, &s->imr);
qemu_put_8s(f, &s->rotate_on_auto_eoi);
qemu_put_8s(f, &s->special_fully_nested_mode);
qemu_put_8s(f, &s->init4);
+ qemu_put_8s(f, &s->single_mode);
qemu_put_8s(f, &s->elcr);
}
static int pic_load(QEMUFile *f, void *opaque, int version_id)
{
PicState *s = opaque;
-
+
if (version_id != 1)
return -EINVAL;
qemu_get_8s(f, &s->rotate_on_auto_eoi);
qemu_get_8s(f, &s->special_fully_nested_mode);
qemu_get_8s(f, &s->init4);
+ qemu_get_8s(f, &s->single_mode);
qemu_get_8s(f, &s->elcr);
return 0;
}
register_ioport_read(elcr_addr, 1, 1, elcr_ioport_read, s);
}
register_savevm("i8259", io_addr, 1, pic_save, pic_load, s);
+ qemu_register_reset(pic_reset, s);
}
void pic_info(void)
int i;
PicState *s;
+ if (!isa_pic)
+ return;
+
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",
- i, s->irr, s->imr, s->isr, s->priority_add,
- s->irq_base, s->read_reg_select, s->elcr);
+ s = &isa_pic->pics[i];
+ 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->special_fully_nested_mode);
}
}
+void irq_info(void)
+{
+#ifndef DEBUG_IRQ_COUNT
+ term_printf("irq statistic code not compiled.\n");
+#else
+ int i;
+ int64_t count;
+
+ term_printf("IRQ statistics:\n");
+ for (i = 0; i < 16; i++) {
+ count = irq_count[i];
+ if (count > 0)
+ term_printf("%2d: %" PRId64 "\n", i, count);
+ }
+#endif
+}
-void pic_init(void)
+qemu_irq *i8259_init(qemu_irq parent_irq)
{
- pic_init1(0x20, 0x4d0, &pics[0]);
- pic_init1(0xa0, 0x4d1, &pics[1]);
- pics[0].elcr_mask = 0xf8;
- pics[1].elcr_mask = 0xde;
+ PicState2 *s;
+
+ s = qemu_mallocz(sizeof(PicState2));
+ if (!s)
+ return NULL;
+ pic_init1(0x20, 0x4d0, &s->pics[0]);
+ pic_init1(0xa0, 0x4d1, &s->pics[1]);
+ s->pics[0].elcr_mask = 0xf8;
+ s->pics[1].elcr_mask = 0xde;
+ s->parent_irq = parent_irq;
+ s->pics[0].pics_state = s;
+ s->pics[1].pics_state = s;
+ isa_pic = s;
+ return qemu_allocate_irqs(i8259_set_irq, s, 16);
}
+void pic_set_alt_irq_func(PicState2 *s, SetIRQFunc *alt_irq_func,
+ void *alt_irq_opaque)
+{
+ s->alt_irq_func = alt_irq_func;
+ s->alt_irq_opaque = alt_irq_opaque;
+}
projects / qemu / blobdiff