2 * ioapic.c IOAPIC emulation logic
4 * Copyright (c) 2004-2005 Fabrice Bellard
6 * Split the ioapic logic from apic.c
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
24 #include "hw/i386/pc.h"
25 #include "hw/i386/ioapic.h"
26 #include "hw/i386/ioapic_internal.h"
28 //#define DEBUG_IOAPIC
31 #define DPRINTF(fmt, ...) \
32 do { printf("ioapic: " fmt , ## __VA_ARGS__); } while (0)
34 #define DPRINTF(fmt, ...)
37 static IOAPICCommonState *ioapics[MAX_IOAPICS];
39 static void ioapic_service(IOAPICCommonState *s)
44 uint8_t delivery_mode;
50 for (i = 0; i < IOAPIC_NUM_PINS; i++) {
53 entry = s->ioredtbl[i];
54 if (!(entry & IOAPIC_LVT_MASKED)) {
55 trig_mode = ((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1);
56 dest = entry >> IOAPIC_LVT_DEST_SHIFT;
57 dest_mode = (entry >> IOAPIC_LVT_DEST_MODE_SHIFT) & 1;
59 (entry >> IOAPIC_LVT_DELIV_MODE_SHIFT) & IOAPIC_DM_MASK;
60 if (trig_mode == IOAPIC_TRIGGER_EDGE) {
63 s->ioredtbl[i] |= IOAPIC_LVT_REMOTE_IRR;
65 if (delivery_mode == IOAPIC_DM_EXTINT) {
66 vector = pic_read_irq(isa_pic);
68 vector = entry & IOAPIC_VECTOR_MASK;
70 apic_deliver_irq(dest, dest_mode, delivery_mode,
77 static void ioapic_set_irq(void *opaque, int vector, int level)
79 IOAPICCommonState *s = opaque;
81 /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
82 * to GSI 2. GSI maps to ioapic 1-1. This is not
83 * the cleanest way of doing it but it should work. */
85 DPRINTF("%s: %s vec %x\n", __func__, level ? "raise" : "lower", vector);
89 if (vector >= 0 && vector < IOAPIC_NUM_PINS) {
90 uint32_t mask = 1 << vector;
91 uint64_t entry = s->ioredtbl[vector];
93 if (entry & (1 << IOAPIC_LVT_POLARITY_SHIFT)) {
96 if (((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) ==
97 IOAPIC_TRIGGER_LEVEL) {
106 /* According to the 82093AA manual, we must ignore edge requests
107 * if the input pin is masked. */
108 if (level && !(entry & IOAPIC_LVT_MASKED)) {
116 void ioapic_eoi_broadcast(int vector)
118 IOAPICCommonState *s;
122 for (i = 0; i < MAX_IOAPICS; i++) {
127 for (n = 0; n < IOAPIC_NUM_PINS; n++) {
128 entry = s->ioredtbl[n];
129 if ((entry & IOAPIC_LVT_REMOTE_IRR)
130 && (entry & IOAPIC_VECTOR_MASK) == vector) {
131 s->ioredtbl[n] = entry & ~IOAPIC_LVT_REMOTE_IRR;
132 if (!(entry & IOAPIC_LVT_MASKED) && (s->irr & (1 << n))) {
141 ioapic_mem_read(void *opaque, hwaddr addr, unsigned int size)
143 IOAPICCommonState *s = opaque;
147 switch (addr & 0xff) {
148 case IOAPIC_IOREGSEL:
155 switch (s->ioregsel) {
157 val = s->id << IOAPIC_ID_SHIFT;
160 val = IOAPIC_VERSION |
161 ((IOAPIC_NUM_PINS - 1) << IOAPIC_VER_ENTRIES_SHIFT);
167 index = (s->ioregsel - IOAPIC_REG_REDTBL_BASE) >> 1;
168 if (index >= 0 && index < IOAPIC_NUM_PINS) {
169 if (s->ioregsel & 1) {
170 val = s->ioredtbl[index] >> 32;
172 val = s->ioredtbl[index] & 0xffffffff;
176 DPRINTF("read: %08x = %08x\n", s->ioregsel, val);
183 ioapic_mem_write(void *opaque, hwaddr addr, uint64_t val,
186 IOAPICCommonState *s = opaque;
189 switch (addr & 0xff) {
190 case IOAPIC_IOREGSEL:
197 DPRINTF("write: %08x = %08" PRIx64 "\n", s->ioregsel, val);
198 switch (s->ioregsel) {
200 s->id = (val >> IOAPIC_ID_SHIFT) & IOAPIC_ID_MASK;
206 index = (s->ioregsel - IOAPIC_REG_REDTBL_BASE) >> 1;
207 if (index >= 0 && index < IOAPIC_NUM_PINS) {
208 if (s->ioregsel & 1) {
209 s->ioredtbl[index] &= 0xffffffff;
210 s->ioredtbl[index] |= (uint64_t)val << 32;
212 s->ioredtbl[index] &= ~0xffffffffULL;
213 s->ioredtbl[index] |= val;
222 static const MemoryRegionOps ioapic_io_ops = {
223 .read = ioapic_mem_read,
224 .write = ioapic_mem_write,
225 .endianness = DEVICE_NATIVE_ENDIAN,
228 static void ioapic_init(IOAPICCommonState *s, int instance_no)
230 memory_region_init_io(&s->io_memory, &ioapic_io_ops, s, "ioapic", 0x1000);
232 qdev_init_gpio_in(&s->busdev.qdev, ioapic_set_irq, IOAPIC_NUM_PINS);
234 ioapics[instance_no] = s;
237 static void ioapic_class_init(ObjectClass *klass, void *data)
239 IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass);
240 DeviceClass *dc = DEVICE_CLASS(klass);
242 k->init = ioapic_init;
243 dc->reset = ioapic_reset_common;
246 static const TypeInfo ioapic_info = {
248 .parent = TYPE_IOAPIC_COMMON,
249 .instance_size = sizeof(IOAPICCommonState),
250 .class_init = ioapic_class_init,
253 static void ioapic_register_types(void)
255 type_register_static(&ioapic_info);
258 type_init(ioapic_register_types)