/*
* 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
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <string.h>
-#include <getopt.h>
-#include <inttypes.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-#include <sys/time.h>
-#include <malloc.h>
-#include <termios.h>
-#include <sys/poll.h>
-#include <errno.h>
-#include <sys/wait.h>
-#include <netinet/in.h>
-
-#include "cpu.h"
-#include "vl.h"
+#include "hw.h"
+#include "pc.h"
+#include "isa.h"
+#include "monitor.h"
+#include "qemu-timer.h"
/* debug PIC */
//#define DEBUG_PIC
+#ifdef DEBUG_PIC
+#define DPRINTF(fmt, ...) \
+ do { printf("pic: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...)
+#endif
+
//#define DEBUG_IRQ_LATENCY
+//#define DEBUG_IRQ_COUNT
-typedef struct PicState {
+struct PicState {
+ ISADevice dev;
uint8_t last_irr; /* edge detection */
uint8_t irr; /* interrupt request register */
uint8_t imr; /* interrupt mask register */
uint8_t rotate_on_auto_eoi;
uint8_t special_fully_nested_mode;
uint8_t init4; /* true if 4 byte init */
-} PicState;
+ uint8_t single_mode; /* true if slave pic is not initialized */
+ uint8_t elcr; /* PIIX edge/trigger selection*/
+ uint8_t elcr_mask;
+ qemu_irq int_out[1];
+ uint32_t master; /* reflects /SP input pin */
+ uint32_t iobase;
+ uint32_t elcr_addr;
+ MemoryRegion base_io;
+ MemoryRegion elcr_io;
+};
-/* 0 is master pic, 1 is slave pic */
-PicState pics[2];
-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)
-{
- int mask;
- mask = 1 << irq;
- if (level) {
- if ((s->last_irr & mask) == 0)
- s->irr |= mask;
- s->last_irr |= mask;
- } else {
- s->last_irr &= ~mask;
- }
-}
+#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
+#ifdef DEBUG_IRQ_LATENCY
+static int64_t irq_time[16];
+#endif
+PicState *isa_pic;
+static PicState *slave_pic;
/* return the highest priority found in mask (highest = smallest
number). Return 8 if no irq */
-static inline int get_priority(PicState *s, int mask)
+static int get_priority(PicState *s, int mask)
{
int priority;
- if (mask == 0)
+
+ if (mask == 0) {
return 8;
+ }
priority = 0;
- while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0)
+ while ((mask & (1 << ((priority + s->priority_add) & 7))) == 0) {
priority++;
+ }
return priority;
}
mask = s->irr & ~s->imr;
priority = get_priority(s, mask);
- if (priority == 8)
+ if (priority == 8) {
return -1;
+ }
/* compute current priority. If special fully nested mode on the
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_mask) {
+ mask &= ~s->imr;
+ }
+ if (s->special_fully_nested_mode && s->master) {
mask &= ~(1 << 2);
+ }
cur_priority = get_priority(s, mask);
if (priority < cur_priority) {
/* higher priority found: an irq should be generated */
}
}
-/* raise irq to CPU if necessary. must be called every time the active
- irq may change */
-void pic_update_irq(void)
+/* Update INT output. Must be called every time the output may have changed. */
+static void pic_update_irq(PicState *s)
{
- int irq2, irq;
-
- /* first look at slave pic */
- irq2 = pic_get_irq(&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);
- }
- /* look at requested irq */
- irq = pic_get_irq(&pics[0]);
+ int irq;
+
+ irq = pic_get_irq(s);
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: cpu_interrupt req=%d\n", pic_irq_requested);
-#endif
- cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
+ DPRINTF("pic%d: imr=%x irr=%x padd=%d\n",
+ s->master ? 0 : 1, s->imr, s->irr, s->priority_add);
+ qemu_irq_raise(s->int_out[0]);
+ } else {
+ qemu_irq_lower(s->int_out[0]);
}
}
-#ifdef DEBUG_IRQ_LATENCY
-int64_t irq_time[16];
-int64_t cpu_get_ticks(void);
+/* set irq level. If an edge is detected, then the IRR is set to 1 */
+static void pic_set_irq(void *opaque, int irq, int level)
+{
+ PicState *s = opaque;
+ int mask = 1 << irq;
+
+#if defined(DEBUG_PIC) || defined(DEBUG_IRQ_COUNT) || \
+ defined(DEBUG_IRQ_LATENCY)
+ int irq_index = s->master ? irq : irq + 8;
#endif
-#if defined(DEBUG_PIC)
-int irq_level[16];
+#if defined(DEBUG_PIC) || defined(DEBUG_IRQ_COUNT)
+ if (level != irq_level[irq_index]) {
+ DPRINTF("pic_set_irq: irq=%d level=%d\n", irq_index, level);
+ irq_level[irq_index] = level;
+#ifdef DEBUG_IRQ_COUNT
+ if (level == 1) {
+ irq_count[irq_index]++;
+ }
#endif
-
-void pic_set_irq(int irq, int level)
-{
-#if defined(DEBUG_PIC)
- if (level != irq_level[irq]) {
- printf("pic_set_irq: irq=%d level=%d\n", irq, level);
- irq_level[irq] = level;
}
#endif
#ifdef DEBUG_IRQ_LATENCY
if (level) {
- irq_time[irq] = cpu_get_ticks();
+ irq_time[irq_index] = qemu_get_clock_ns(vm_clock);
}
#endif
- pic_set_irq1(&pics[irq >> 3], irq & 7, level);
- pic_update_irq();
+
+ if (s->elcr & mask) {
+ /* level triggered */
+ if (level) {
+ s->irr |= mask;
+ s->last_irr |= mask;
+ } else {
+ s->irr &= ~mask;
+ s->last_irr &= ~mask;
+ }
+ } else {
+ /* edge triggered */
+ if (level) {
+ if ((s->last_irr & mask) == 0) {
+ s->irr |= mask;
+ }
+ s->last_irr |= mask;
+ } else {
+ s->last_irr &= ~mask;
+ }
+ }
+ pic_update_irq(s);
}
/* acknowledge interrupt 'irq' */
-static inline void pic_intack(PicState *s, int irq)
+static void pic_intack(PicState *s, int irq)
{
if (s->auto_eoi) {
- if (s->rotate_on_auto_eoi)
+ if (s->rotate_on_auto_eoi) {
s->priority_add = (irq + 1) & 7;
+ }
} 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);
+ }
+ pic_update_irq(s);
}
-int cpu_x86_get_pic_interrupt(CPUState *env)
+int pic_read_irq(PicState *s)
{
int irq, irq2, intno;
- /* signal the pic that the irq was acked by the CPU */
- irq = pic_irq_requested;
-#ifdef DEBUG_IRQ_LATENCY
- printf("IRQ%d latency=%0.3fus\n",
- irq,
- (double)(cpu_get_ticks() - 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;
+ irq = pic_get_irq(s);
+ if (irq >= 0) {
+ if (irq == 2) {
+ irq2 = pic_get_irq(slave_pic);
+ if (irq2 >= 0) {
+ pic_intack(slave_pic, irq2);
+ } else {
+ /* spurious IRQ on slave controller */
+ irq2 = 7;
+ }
+ intno = slave_pic->irq_base + irq2;
+ } else {
+ intno = s->irq_base + irq;
+ }
+ pic_intack(s, irq);
} else {
- intno = pics[0].irq_base + irq;
+ /* spurious IRQ on host controller */
+ irq = 7;
+ intno = s->irq_base + irq;
+ }
+
+#if defined(DEBUG_PIC) || defined(DEBUG_IRQ_LATENCY)
+ if (irq == 2) {
+ irq = irq2 + 8;
}
- pic_intack(&pics[0], irq);
+#endif
+#ifdef DEBUG_IRQ_LATENCY
+ printf("IRQ%d latency=%0.3fus\n",
+ irq,
+ (double)(qemu_get_clock_ns(vm_clock) -
+ irq_time[irq]) * 1000000.0 / get_ticks_per_sec());
+#endif
+ DPRINTF("pic_interrupt: irq=%d\n", irq);
return intno;
}
-static void pic_ioport_write(void *opaque, uint32_t addr, uint32_t val)
+static void pic_init_reset(PicState *s)
+{
+ 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 */
+ pic_update_irq(s);
+}
+
+static void pic_reset(DeviceState *dev)
+{
+ PicState *s = container_of(dev, PicState, dev.qdev);
+
+ pic_init_reset(s);
+ s->elcr = 0;
+}
+
+static void pic_ioport_write(void *opaque, target_phys_addr_t addr64,
+ uint64_t val64, unsigned size)
{
PicState *s = opaque;
+ uint32_t addr = addr64;
+ uint32_t val = val64;
int priority, cmd, irq;
-#ifdef DEBUG_PIC
- printf("pic_write: addr=0x%02x val=0x%02x\n", addr, val);
-#endif
- addr &= 1;
+ DPRINTF("write: addr=0x%02x val=0x%02x\n", addr, val);
if (addr == 0) {
if (val & 0x10) {
- /* init */
- memset(s, 0, sizeof(PicState));
+ pic_init_reset(s);
s->init_state = 1;
s->init4 = val & 1;
- if (val & 0x02)
- hw_error("single mode not supported");
- if (val & 0x08)
+ s->single_mode = val & 2;
+ if (val & 0x08) {
hw_error("level sensitive irq not supported");
+ }
} else if (val & 0x08) {
- if (val & 0x04)
+ if (val & 0x04) {
s->poll = 1;
- if (val & 0x02)
+ }
+ if (val & 0x02) {
s->read_reg_select = val & 1;
- if (val & 0x40)
+ }
+ if (val & 0x40) {
s->special_mask = (val >> 5) & 1;
+ }
} else {
cmd = val >> 5;
- switch(cmd) {
+ switch (cmd) {
case 0:
case 4:
s->rotate_on_auto_eoi = cmd >> 2;
if (priority != 8) {
irq = (priority + s->priority_add) & 7;
s->isr &= ~(1 << irq);
- if (cmd == 5)
+ if (cmd == 5) {
s->priority_add = (irq + 1) & 7;
- pic_update_irq();
+ }
+ pic_update_irq(s);
}
break;
case 3:
irq = val & 7;
s->isr &= ~(1 << irq);
- pic_update_irq();
+ pic_update_irq(s);
break;
case 6:
s->priority_add = (val + 1) & 7;
- pic_update_irq();
+ pic_update_irq(s);
break;
case 7:
irq = val & 7;
s->isr &= ~(1 << irq);
s->priority_add = (irq + 1) & 7;
- pic_update_irq();
+ pic_update_irq(s);
break;
default:
/* no operation */
}
}
} else {
- switch(s->init_state) {
+ switch (s->init_state) {
case 0:
/* normal mode */
s->imr = val;
- pic_update_irq();
+ pic_update_irq(s);
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) {
}
}
-static uint32_t pic_poll_read (PicState *s, uint32_t addr1)
-{
- int ret;
-
- ret = pic_get_irq(s);
- if (ret >= 0) {
- if (addr1 >> 7) {
- pics[0].isr &= ~(1 << 2);
- pics[0].irr &= ~(1 << 2);
- }
- s->irr &= ~(1 << ret);
- s->isr &= ~(1 << ret);
- if (addr1 >> 7 || ret != 2)
- pic_update_irq();
- } else {
- ret = 0x07;
- pic_update_irq();
- }
-
- return ret;
-}
-
-static uint32_t pic_ioport_read(void *opaque, uint32_t addr1)
+static uint64_t pic_ioport_read(void *opaque, target_phys_addr_t addr,
+ unsigned size)
{
PicState *s = opaque;
- unsigned int addr;
int ret;
- addr = addr1;
- addr &= 1;
if (s->poll) {
- ret = pic_poll_read(s, addr1);
+ ret = pic_get_irq(s);
+ if (ret >= 0) {
+ pic_intack(s, ret);
+ ret |= 0x80;
+ } else {
+ ret = 0;
+ }
s->poll = 0;
} else {
if (addr == 0) {
- if (s->read_reg_select)
+ if (s->read_reg_select) {
ret = s->isr;
- else
+ } else {
ret = s->irr;
+ }
} else {
ret = s->imr;
}
}
-#ifdef DEBUG_PIC
- printf("pic_read: addr=0x%02x val=0x%02x\n", addr1, ret);
-#endif
+ DPRINTF("read: addr=0x%02x val=0x%02x\n", addr, ret);
return ret;
}
-/* memory mapped interrupt status */
-uint32_t pic_intack_read(CPUState *env)
+int pic_get_output(PicState *s)
{
- int ret;
+ return (pic_get_irq(s) >= 0);
+}
- ret = pic_poll_read(&pics[0], 0x00);
- if (ret == 2)
- ret = pic_poll_read(&pics[1], 0x80) + 8;
- /* Prepare for ISR read */
- pics[0].read_reg_select = 1;
-
- return ret;
+static void elcr_ioport_write(void *opaque, target_phys_addr_t addr,
+ uint64_t val, unsigned size)
+{
+ PicState *s = opaque;
+ s->elcr = val & s->elcr_mask;
}
-void pic_init(void)
+static uint64_t elcr_ioport_read(void *opaque, target_phys_addr_t addr,
+ unsigned size)
{
- register_ioport_write(0x20, 2, 1, pic_ioport_write, &pics[0]);
- register_ioport_read(0x20, 2, 1, pic_ioport_read, &pics[0]);
- register_ioport_write(0xa0, 2, 1, pic_ioport_write, &pics[1]);
- register_ioport_read(0xa0, 2, 1, pic_ioport_read, &pics[1]);
+ PicState *s = opaque;
+ return s->elcr;
}
+static const VMStateDescription vmstate_pic = {
+ .name = "i8259",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8(last_irr, PicState),
+ VMSTATE_UINT8(irr, PicState),
+ VMSTATE_UINT8(imr, PicState),
+ VMSTATE_UINT8(isr, PicState),
+ VMSTATE_UINT8(priority_add, PicState),
+ VMSTATE_UINT8(irq_base, PicState),
+ VMSTATE_UINT8(read_reg_select, PicState),
+ VMSTATE_UINT8(poll, PicState),
+ VMSTATE_UINT8(special_mask, PicState),
+ VMSTATE_UINT8(init_state, PicState),
+ VMSTATE_UINT8(auto_eoi, PicState),
+ VMSTATE_UINT8(rotate_on_auto_eoi, PicState),
+ VMSTATE_UINT8(special_fully_nested_mode, PicState),
+ VMSTATE_UINT8(init4, PicState),
+ VMSTATE_UINT8(single_mode, PicState),
+ VMSTATE_UINT8(elcr, PicState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static const MemoryRegionOps pic_base_ioport_ops = {
+ .read = pic_ioport_read,
+ .write = pic_ioport_write,
+ .impl = {
+ .min_access_size = 1,
+ .max_access_size = 1,
+ },
+};
+
+static const MemoryRegionOps pic_elcr_ioport_ops = {
+ .read = elcr_ioport_read,
+ .write = elcr_ioport_write,
+ .impl = {
+ .min_access_size = 1,
+ .max_access_size = 1,
+ },
+};
+
+static int pic_initfn(ISADevice *dev)
+{
+ PicState *s = DO_UPCAST(PicState, dev, dev);
+
+ memory_region_init_io(&s->base_io, &pic_base_ioport_ops, s, "pic", 2);
+ memory_region_init_io(&s->elcr_io, &pic_elcr_ioport_ops, s, "elcr", 1);
+
+ isa_register_ioport(NULL, &s->base_io, s->iobase);
+ if (s->elcr_addr != -1) {
+ isa_register_ioport(NULL, &s->elcr_io, s->elcr_addr);
+ }
+
+ qdev_init_gpio_out(&dev->qdev, s->int_out, ARRAY_SIZE(s->int_out));
+ qdev_init_gpio_in(&dev->qdev, pic_set_irq, 8);
+
+ qdev_set_legacy_instance_id(&dev->qdev, s->iobase, 1);
+
+ return 0;
+}
+
+void pic_info(Monitor *mon)
+{
+ int i;
+ PicState *s;
+
+ if (!isa_pic) {
+ return;
+ }
+ for (i = 0; i < 2; i++) {
+ s = i == 0 ? isa_pic : slave_pic;
+ monitor_printf(mon, "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(Monitor *mon)
+{
+#ifndef DEBUG_IRQ_COUNT
+ monitor_printf(mon, "irq statistic code not compiled.\n");
+#else
+ int i;
+ int64_t count;
+
+ monitor_printf(mon, "IRQ statistics:\n");
+ for (i = 0; i < 16; i++) {
+ count = irq_count[i];
+ if (count > 0) {
+ monitor_printf(mon, "%2d: %" PRId64 "\n", i, count);
+ }
+ }
+#endif
+}
+
+qemu_irq *i8259_init(qemu_irq parent_irq)
+{
+ qemu_irq *irq_set;
+ ISADevice *dev;
+ int i;
+
+ irq_set = g_malloc(ISA_NUM_IRQS * sizeof(qemu_irq));
+
+ dev = isa_create("isa-i8259");
+ qdev_prop_set_uint32(&dev->qdev, "iobase", 0x20);
+ qdev_prop_set_uint32(&dev->qdev, "elcr_addr", 0x4d0);
+ qdev_prop_set_uint8(&dev->qdev, "elcr_mask", 0xf8);
+ qdev_prop_set_bit(&dev->qdev, "master", true);
+ qdev_init_nofail(&dev->qdev);
+
+ qdev_connect_gpio_out(&dev->qdev, 0, parent_irq);
+ for (i = 0 ; i < 8; i++) {
+ irq_set[i] = qdev_get_gpio_in(&dev->qdev, i);
+ }
+
+ isa_pic = DO_UPCAST(PicState, dev, dev);
+
+ dev = isa_create("isa-i8259");
+ qdev_prop_set_uint32(&dev->qdev, "iobase", 0xa0);
+ qdev_prop_set_uint32(&dev->qdev, "elcr_addr", 0x4d1);
+ qdev_prop_set_uint8(&dev->qdev, "elcr_mask", 0xde);
+ qdev_init_nofail(&dev->qdev);
+
+ qdev_connect_gpio_out(&dev->qdev, 0, irq_set[2]);
+ for (i = 0 ; i < 8; i++) {
+ irq_set[i + 8] = qdev_get_gpio_in(&dev->qdev, i);
+ }
+
+ slave_pic = DO_UPCAST(PicState, dev, dev);
+
+ return irq_set;
+}
+
+static ISADeviceInfo i8259_info = {
+ .qdev.name = "isa-i8259",
+ .qdev.size = sizeof(PicState),
+ .qdev.vmsd = &vmstate_pic,
+ .qdev.reset = pic_reset,
+ .qdev.no_user = 1,
+ .init = pic_initfn,
+ .qdev.props = (Property[]) {
+ DEFINE_PROP_HEX32("iobase", PicState, iobase, -1),
+ DEFINE_PROP_HEX32("elcr_addr", PicState, elcr_addr, -1),
+ DEFINE_PROP_HEX8("elcr_mask", PicState, elcr_mask, -1),
+ DEFINE_PROP_BIT("master", PicState, master, 0, false),
+ DEFINE_PROP_END_OF_LIST(),
+ },
+};
+
+static void pic_register(void)
+{
+ isa_qdev_register(&i8259_info);
+}
+device_init(pic_register)
projects / qemu.git / blobdiff