hw/intc/ioapic.c

   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                 ioapic_service(s);
 102             } else {
 103                 s->irr &= ~mask;
 104             }
 105         } else {
 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)) {
 109                 s->irr |= mask;
 110                 ioapic_service(s);
 111             }
 112         }
 113     }
 114 }
 115
 116 void ioapic_eoi_broadcast(int vector)
 117 {
 118     IOAPICCommonState *s;
 119     uint64_t entry;
 120     int i, n;
 121
 122     for (i = 0; i < MAX_IOAPICS; i++) {
 123         s = ioapics[i];
 124         if (!s) {
 125             continue;
 126         }
 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))) {
 133                     ioapic_service(s);
 134                 }
 135             }
 136         }
 137     }
 138 }
 139
 140 static uint64_t
 141 ioapic_mem_read(void *opaque, hwaddr addr, unsigned int size)
 142 {
 143     IOAPICCommonState *s = opaque;
 144     int index;
 145     uint32_t val = 0;
 146
 147     switch (addr & 0xff) {
 148     case IOAPIC_IOREGSEL:
 149         val = s->ioregsel;
 150         break;
 151     case IOAPIC_IOWIN:
 152         if (size != 4) {
 153             break;
 154         }
 155         switch (s->ioregsel) {
 156         case IOAPIC_REG_ID:
 157             val = s->id << IOAPIC_ID_SHIFT;
 158             break;
 159         case IOAPIC_REG_VER:
 160             val = IOAPIC_VERSION |
 161                 ((IOAPIC_NUM_PINS - 1) << IOAPIC_VER_ENTRIES_SHIFT);
 162             break;
 163         case IOAPIC_REG_ARB:
 164             val = 0;
 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)