1 /* 2 * ioapic.c IOAPIC emulation logic 3 * 4 * Copyright (c) 2004-2005 Fabrice Bellard 5 * 6 * Split the ioapic logic from apic.c 7 * Xiantao Zhang <xiantao.zhang@intel.com> 8 * 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. 13 * 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. 18 * 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/>. 21 */ 22 23 #include "hw/hw.h" 24 #include "hw/i386/pc.h" 25 #include "hw/i386/ioapic.h" 26 #include "hw/i386/ioapic_internal.h" 27 28 //#define DEBUG_IOAPIC 29 30 #ifdef DEBUG_IOAPIC 31 #define DPRINTF(fmt, ...) \ 32 do { printf("ioapic: " fmt , ## __VA_ARGS__); } while (0) 33 #else 34 #define DPRINTF(fmt, ...) 35 #endif 36 37 static IOAPICCommonState *ioapics[MAX_IOAPICS]; 38 39 /* global variable from ioapic_common.c */ 40 extern int ioapic_no; 41 42 static void ioapic_service(IOAPICCommonState *s) 43 { 44 uint8_t i; 45 uint8_t trig_mode; 46 uint8_t vector; 47 uint8_t delivery_mode; 48 uint32_t mask; 49 uint64_t entry; 50 uint8_t dest; 51 uint8_t dest_mode; 52 53 for (i = 0; i < IOAPIC_NUM_PINS; i++) { 54 mask = 1 << i; 55 if (s->irr & mask) { 56 entry = s->ioredtbl[i]; 57 if (!(entry & IOAPIC_LVT_MASKED)) { 58 trig_mode = ((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1); 59 dest = entry >> IOAPIC_LVT_DEST_SHIFT; 60 dest_mode = (entry >> IOAPIC_LVT_DEST_MODE_SHIFT) & 1; 61 delivery_mode = 62 (entry >> IOAPIC_LVT_DELIV_MODE_SHIFT) & IOAPIC_DM_MASK; 63 if (trig_mode == IOAPIC_TRIGGER_EDGE) { 64 s->irr &= ~mask; 65 } else { 66 s->ioredtbl[i] |= IOAPIC_LVT_REMOTE_IRR; 67 } 68 if (delivery_mode == IOAPIC_DM_EXTINT) { 69 vector = pic_read_irq(isa_pic); 70 } else { 71 vector = entry & IOAPIC_VECTOR_MASK; 72 } 73 apic_deliver_irq(dest, dest_mode, delivery_mode, 74 vector, trig_mode); 75 } 76 } 77 } 78 } 79 80 static void ioapic_set_irq(void *opaque, int vector, int level) 81 { 82 IOAPICCommonState *s = opaque; 83 84 /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps 85 * to GSI 2. GSI maps to ioapic 1-1. This is not 86 * the cleanest way of doing it but it should work. */ 87 88 DPRINTF("%s: %s vec %x\n", __func__, level ? "raise" : "lower", vector); 89 if (vector == 0) { 90 vector = 2; 91 } 92 if (vector >= 0 && vector < IOAPIC_NUM_PINS) { 93 uint32_t mask = 1 << vector; 94 uint64_t entry = s->ioredtbl[vector]; 95 96 if (((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) == 97 IOAPIC_TRIGGER_LEVEL) { 98 /* level triggered */ 99 if (level) { 100 s->irr |= mask; 101 if (!(entry & IOAPIC_LVT_REMOTE_IRR)) { 102 ioapic_service(s); 103 } 104 } else { 105 s->irr &= ~mask; 106 } 107 } else { 108 /* According to the 82093AA manual, we must ignore edge requests 109 * if the input pin is masked. */ 110 if (level && !(entry & IOAPIC_LVT_MASKED)) { 111 s->irr |= mask; 112 ioapic_service(s); 113 } 114 } 115 } 116 } 117 118 void ioapic_eoi_broadcast(int vector) 119 { 120 IOAPICCommonState *s; 121 uint64_t entry; 122 int i, n; 123 124 for (i = 0; i < MAX_IOAPICS; i++) { 125 s = ioapics[i]; 126 if (!s) { 127 continue; 128 } 129 for (n = 0; n < IOAPIC_NUM_PINS; n++) { 130 entry = s->ioredtbl[n]; 131 if ((entry & IOAPIC_LVT_REMOTE_IRR) 132 && (entry & IOAPIC_VECTOR_MASK) == vector) { 133 s->ioredtbl[n] = entry & ~IOAPIC_LVT_REMOTE_IRR; 134 if (!(entry & IOAPIC_LVT_MASKED) && (s->irr & (1 << n))) { 135 ioapic_service(s); 136 } 137 } 138 } 139 } 140 } 141 142 static uint64_t 143 ioapic_mem_read(void *opaque, hwaddr addr, unsigned int size) 144 { 145 IOAPICCommonState *s = opaque; 146 int index; 147 uint32_t val = 0; 148 149 switch (addr & 0xff) { 150 case IOAPIC_IOREGSEL: 151 val = s->ioregsel; 152 break; 153 case IOAPIC_IOWIN: 154 if (size != 4) { 155 break; 156 } 157 switch (s->ioregsel) { 158 case IOAPIC_REG_ID: 159 case IOAPIC_REG_ARB: 160 val = s->id << IOAPIC_ID_SHIFT; 161 break; 162 case IOAPIC_REG_VER: 163 val = IOAPIC_VERSION | 164 ((IOAPIC_NUM_PINS - 1) << IOAPIC_VER_ENTRIES_SHIFT); 165 break; 166 default: 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; 171 } else { 172 val = s->ioredtbl[index] & 0xffffffff; 173 } 174 } 175 } 176 DPRINTF("read: %08x = %08x\n", s->ioregsel, val); 177 break; 178 } 179 return val; 180 } 181 182 static void 183 ioapic_mem_write(void *opaque, hwaddr addr, uint64_t val, 184 unsigned int size) 185 { 186 IOAPICCommonState *s = opaque; 187 int index; 188 189 switch (addr & 0xff) { 190 case IOAPIC_IOREGSEL: 191 s->ioregsel = val; 192 break; 193 case IOAPIC_IOWIN: 194 if (size != 4) { 195 break; 196 } 197 DPRINTF("write: %08x = %08" PRIx64 "\n", s->ioregsel, val); 198 switch (s->ioregsel) { 199 case IOAPIC_REG_ID: 200 s->id = (val >> IOAPIC_ID_SHIFT) & IOAPIC_ID_MASK; 201 break; 202 case IOAPIC_REG_VER: 203 case IOAPIC_REG_ARB: 204 break; 205 default: 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; 211 } else { 212 s->ioredtbl[index] &= ~0xffffffffULL; 213 s->ioredtbl[index] |= val; 214 } 215 ioapic_service(s); 216 } 217 } 218 break; 219 } 220 } 221 222 static const MemoryRegionOps ioapic_io_ops = { 223 .read = ioapic_mem_read, 224 .write = ioapic_mem_write, 225 .endianness = DEVICE_NATIVE_ENDIAN, 226 }; 227 228 static void ioapic_realize(DeviceState *dev, Error **errp) 229 { 230 IOAPICCommonState *s = IOAPIC_COMMON(dev); 231 232 memory_region_init_io(&s->io_memory, OBJECT(s), &ioapic_io_ops, s, 233 "ioapic", 0x1000); 234 235 qdev_init_gpio_in(dev, ioapic_set_irq, IOAPIC_NUM_PINS); 236 237 ioapics[ioapic_no] = s; 238 } 239 240 static void ioapic_class_init(ObjectClass *klass, void *data) 241 { 242 IOAPICCommonClass *k = IOAPIC_COMMON_CLASS(klass); 243 DeviceClass *dc = DEVICE_CLASS(klass); 244 245 k->realize = ioapic_realize; 246 dc->reset = ioapic_reset_common; 247 } 248 249 static const TypeInfo ioapic_info = { 250 .name = "ioapic", 251 .parent = TYPE_IOAPIC_COMMON, 252 .instance_size = sizeof(IOAPICCommonState), 253 .class_init = ioapic_class_init, 254 }; 255 256 static void ioapic_register_types(void) 257 { 258 type_register_static(&ioapic_info); 259 } 260 261 type_init(ioapic_register_types) 262