hw/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.h"
  24 #include "pc.h"
  25 #include "qemu-timer.h"
  26 #include "host-utils.h"
  27
  28 //#define DEBUG_IOAPIC
  29
  30 #define IOAPIC_NUM_PINS                 0x18
  31 #define IOAPIC_LVT_MASKED               (1<<16)
  32
  33 #define IOAPIC_TRIGGER_EDGE             0
  34 #define IOAPIC_TRIGGER_LEVEL            1
  35
  36 /*io{apic,sapic} delivery mode*/
  37 #define IOAPIC_DM_FIXED                 0x0
  38 #define IOAPIC_DM_LOWEST_PRIORITY       0x1
  39 #define IOAPIC_DM_PMI                   0x2
  40 #define IOAPIC_DM_NMI                   0x4
  41 #define IOAPIC_DM_INIT                  0x5
  42 #define IOAPIC_DM_SIPI                  0x5
  43 #define IOAPIC_DM_EXTINT                0x7
  44
  45 struct IOAPICState {
  46     uint8_t id;
  47     uint8_t ioregsel;
  48
  49     uint32_t irr;
  50     uint64_t ioredtbl[IOAPIC_NUM_PINS];
  51 };
  52
  53 static void ioapic_service(IOAPICState *s)
  54 {
  55     uint8_t i;
  56     uint8_t trig_mode;
  57     uint8_t vector;
  58     uint8_t delivery_mode;
  59     uint32_t mask;
  60     uint64_t entry;
  61     uint8_t dest;
  62     uint8_t dest_mode;
  63     uint8_t polarity;
  64
  65     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
  66         mask = 1 << i;
  67         if (s->irr & mask) {
  68             entry = s->ioredtbl[i];
  69             if (!(entry & IOAPIC_LVT_MASKED)) {
  70                 trig_mode = ((entry >> 15) & 1);
  71                 dest = entry >> 56;
  72                 dest_mode = (entry >> 11) & 1;
  73                 delivery_mode = (entry >> 8) & 7;
  74                 polarity = (entry >> 13) & 1;
  75                 if (trig_mode == IOAPIC_TRIGGER_EDGE)
  76                     s->irr &= ~mask;
  77                 if (delivery_mode == IOAPIC_DM_EXTINT)
  78                     vector = pic_read_irq(isa_pic);
  79                 else
  80                     vector = entry & 0xff;
  81
  82                 apic_deliver_irq(dest, dest_mode, delivery_mode,
  83                                  vector, polarity, trig_mode);
  84             }
  85         }
  86     }
  87 }
  88
  89 void ioapic_set_irq(void *opaque, int vector, int level)
  90 {
  91     IOAPICState *s = opaque;
  92
  93     /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
  94      * to GSI 2.  GSI maps to ioapic 1-1.  This is not
  95      * the cleanest way of doing it but it should work. */
  96
  97     if (vector == 0)
  98         vector = 2;
  99
 100     if (vector >= 0 && vector < IOAPIC_NUM_PINS) {
 101         uint32_t mask = 1 << vector;
 102         uint64_t entry = s->ioredtbl[vector];
 103
 104         if ((entry >> 15) & 1) {
 105             /* level triggered */
 106             if (level) {
 107                 s->irr |= mask;
 108                 ioapic_service(s);
 109             } else {
 110                 s->irr &= ~mask;
 111             }
 112         } else {
 113             /* edge triggered */
 114             if (level) {
 115                 s->irr |= mask;
 116                 ioapic_service(s);
 117             }
 118         }
 119     }
 120 }
 121
 122 static uint32_t ioapic_mem_readl(void *opaque, target_phys_addr_t addr)
 123 {
 124     IOAPICState *s = opaque;
 125     int index;
 126     uint32_t val = 0;
 127
 128     addr &= 0xff;
 129     if (addr == 0x00) {
 130         val = s->ioregsel;
 131     } else if (addr == 0x10) {
 132         switch (s->ioregsel) {
 133             case 0x00:
 134                 val = s->id << 24;
 135                 break;
 136             case 0x01:
 137                 val = 0x11 | ((IOAPIC_NUM_PINS - 1) << 16); /* version 0x11 */
 138                 break;
 139             case 0x02:
 140                 val = 0;
 141                 break;
 142             default:
 143                 index = (s->ioregsel - 0x10) >> 1;
 144                 if (index >= 0 && index < IOAPIC_NUM_PINS) {
 145                     if (s->ioregsel & 1)
 146                         val = s->ioredtbl[index] >> 32;
 147                     else
 148                         val = s->ioredtbl[index] & 0xffffffff;
 149                 }
 150         }
 151 #ifdef DEBUG_IOAPIC
 152         printf("I/O APIC read: %08x = %08x\n", s->ioregsel, val);
 153 #endif
 154     }
 155     return val;
 156 }
 157
 158 static void ioapic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 159 {
 160     IOAPICState *s = opaque;
 161     int index;
 162
 163     addr &= 0xff;
 164     if (addr == 0x00)  {
 165         s->ioregsel = val;
 166         return;
 167     } else if (addr == 0x10) {
 168 #ifdef DEBUG_IOAPIC
 169         printf("I/O APIC write: %08x = %08x\n", s->ioregsel, val);
 170 #endif
 171         switch (s->ioregsel) {
 172             case 0x00:
 173                 s->id = (val >> 24) & 0xff;
 174                 return;
 175             case 0x01:
 176             case 0x02:
 177                 return;
 178             default:
 179                 index = (s->ioregsel - 0x10) >> 1;
 180                 if (index >= 0 && index < IOAPIC_NUM_PINS) {
 181                     if (s->ioregsel & 1) {
 182                         s->ioredtbl[index] &= 0xffffffff;
 183                         s->ioredtbl[index] |= (uint64_t)val << 32;
 184                     } else {
 185                         s->ioredtbl[index] &= ~0xffffffffULL;
 186                         s->ioredtbl[index] |= val;
 187                     }
 188                     ioapic_service(s);
 189                 }
 190         }
 191     }
 192 }
 193
 194 static void ioapic_save(QEMUFile *f, void *opaque)
 195 {
 196     IOAPICState *s = opaque;
 197     int i;
 198
 199     qemu_put_8s(f, &s->id);
 200     qemu_put_8s(f, &s->ioregsel);
 201     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
 202         qemu_put_be64s(f, &s->ioredtbl[i]);
 203     }
 204 }
 205
 206 static int ioapic_load(QEMUFile *f, void *opaque, int version_id)
 207 {
 208     IOAPICState *s = opaque;
 209     int i;
 210
 211     if (version_id != 1)
 212         return -EINVAL;
 213
 214     qemu_get_8s(f, &s->id);
 215     qemu_get_8s(f, &s->ioregsel);
 216     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
 217         qemu_get_be64s(f, &s->ioredtbl[i]);
 218     }
 219     return 0;
 220 }
 221
 222 static void ioapic_reset(void *opaque)
 223 {
 224     IOAPICState *s = opaque;
 225     int i;
 226
 227     memset(s, 0, sizeof(*s));
 228     for(i = 0; i < IOAPIC_NUM_PINS; i++)
 229         s->ioredtbl[i] = 1 << 16; /* mask LVT */
 230 }
 231
 232 static CPUReadMemoryFunc *ioapic_mem_read[3] = {
 233     ioapic_mem_readl,
 234     ioapic_mem_readl,
 235     ioapic_mem_readl,
 236 };
 237
 238 static CPUWriteMemoryFunc *ioapic_mem_write[3] = {
 239     ioapic_mem_writel,
 240     ioapic_mem_writel,
 241     ioapic_mem_writel,
 242 };
 243
 244 IOAPICState *ioapic_init(void)
 245 {
 246     IOAPICState *s;
 247     int io_memory;
 248
 249     s = qemu_mallocz(sizeof(IOAPICState));
 250     ioapic_reset(s);
 251
 252     io_memory = cpu_register_io_memory(ioapic_mem_read,
 253                                        ioapic_mem_write, s);
 254     cpu_register_physical_memory(0xfec00000, 0x1000, io_memory);
 255
 256     register_savevm("ioapic", 0, 1, ioapic_save, ioapic_load, s);
 257     qemu_register_reset(ioapic_reset, s);
 258
 259     return s;
 260 }