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 "apic.h"
  26 #include "ioapic.h"
  27 #include "qemu-timer.h"
  28 #include "host-utils.h"
  29 #include "sysbus.h"
  30
  31 //#define DEBUG_IOAPIC
  32
  33 #ifdef DEBUG_IOAPIC
  34 #define DPRINTF(fmt, ...)                                       \
  35     do { printf("ioapic: " fmt , ## __VA_ARGS__); } while (0)
  36 #else
  37 #define DPRINTF(fmt, ...)
  38 #endif
  39
  40 #define MAX_IOAPICS                     1
  41
  42 #define IOAPIC_VERSION                  0x11
  43
  44 #define IOAPIC_LVT_DEST_SHIFT           56
  45 #define IOAPIC_LVT_MASKED_SHIFT         16
  46 #define IOAPIC_LVT_TRIGGER_MODE_SHIFT   15
  47 #define IOAPIC_LVT_REMOTE_IRR_SHIFT     14
  48 #define IOAPIC_LVT_POLARITY_SHIFT       13
  49 #define IOAPIC_LVT_DELIV_STATUS_SHIFT   12
  50 #define IOAPIC_LVT_DEST_MODE_SHIFT      11
  51 #define IOAPIC_LVT_DELIV_MODE_SHIFT     8
  52
  53 #define IOAPIC_LVT_MASKED               (1 << IOAPIC_LVT_MASKED_SHIFT)
  54 #define IOAPIC_LVT_REMOTE_IRR           (1 << IOAPIC_LVT_REMOTE_IRR_SHIFT)
  55
  56 #define IOAPIC_TRIGGER_EDGE             0
  57 #define IOAPIC_TRIGGER_LEVEL            1
  58
  59 /*io{apic,sapic} delivery mode*/
  60 #define IOAPIC_DM_FIXED                 0x0
  61 #define IOAPIC_DM_LOWEST_PRIORITY       0x1
  62 #define IOAPIC_DM_PMI                   0x2
  63 #define IOAPIC_DM_NMI                   0x4
  64 #define IOAPIC_DM_INIT                  0x5
  65 #define IOAPIC_DM_SIPI                  0x6
  66 #define IOAPIC_DM_EXTINT                0x7
  67 #define IOAPIC_DM_MASK                  0x7
  68
  69 #define IOAPIC_VECTOR_MASK              0xff
  70
  71 #define IOAPIC_IOREGSEL                 0x00
  72 #define IOAPIC_IOWIN                    0x10
  73
  74 #define IOAPIC_REG_ID                   0x00
  75 #define IOAPIC_REG_VER                  0x01
  76 #define IOAPIC_REG_ARB                  0x02
  77 #define IOAPIC_REG_REDTBL_BASE          0x10
  78 #define IOAPIC_ID                       0x00
  79
  80 #define IOAPIC_ID_SHIFT                 24
  81 #define IOAPIC_ID_MASK                  0xf
  82
  83 #define IOAPIC_VER_ENTRIES_SHIFT        16
  84
  85 typedef struct IOAPICState IOAPICState;
  86
  87 struct IOAPICState {
  88     SysBusDevice busdev;
  89     uint8_t id;
  90     uint8_t ioregsel;
  91     uint32_t irr;
  92     uint64_t ioredtbl[IOAPIC_NUM_PINS];
  93 };
  94
  95 static IOAPICState *ioapics[MAX_IOAPICS];
  96
  97 static void ioapic_service(IOAPICState *s)
  98 {
  99     uint8_t i;
 100     uint8_t trig_mode;
 101     uint8_t vector;
 102     uint8_t delivery_mode;
 103     uint32_t mask;
 104     uint64_t entry;
 105     uint8_t dest;
 106     uint8_t dest_mode;
 107     uint8_t polarity;
 108
 109     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
 110         mask = 1 << i;
 111         if (s->irr & mask) {
 112             entry = s->ioredtbl[i];
 113             if (!(entry & IOAPIC_LVT_MASKED)) {
 114                 trig_mode = ((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1);
 115                 dest = entry >> IOAPIC_LVT_DEST_SHIFT;
 116                 dest_mode = (entry >> IOAPIC_LVT_DEST_MODE_SHIFT) & 1;
 117                 delivery_mode =
 118                     (entry >> IOAPIC_LVT_DELIV_MODE_SHIFT) & IOAPIC_DM_MASK;
 119                 polarity = (entry >> IOAPIC_LVT_POLARITY_SHIFT) & 1;
 120                 if (trig_mode == IOAPIC_TRIGGER_EDGE) {
 121                     s->irr &= ~mask;
 122                 } else {
 123                     s->ioredtbl[i] |= IOAPIC_LVT_REMOTE_IRR;
 124                 }
 125                 if (delivery_mode == IOAPIC_DM_EXTINT) {
 126                     vector = pic_read_irq(isa_pic);
 127                 } else {
 128                     vector = entry & IOAPIC_VECTOR_MASK;
 129                 }
 130                 apic_deliver_irq(dest, dest_mode, delivery_mode,
 131                                  vector, polarity, trig_mode);
 132             }
 133         }
 134     }
 135 }
 136
 137 static void ioapic_set_irq(void *opaque, int vector, int level)
 138 {
 139     IOAPICState *s = opaque;
 140
 141     /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
 142      * to GSI 2.  GSI maps to ioapic 1-1.  This is not
 143      * the cleanest way of doing it but it should work. */
 144
 145     DPRINTF("%s: %s vec %x\n", __func__, level ? "raise" : "lower", vector);
 146     if (vector == 0) {
 147         vector = 2;
 148     }
 149     if (vector >= 0 && vector < IOAPIC_NUM_PINS) {
 150         uint32_t mask = 1 << vector;
 151         uint64_t entry = s->ioredtbl[vector];
 152
 153         if (((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) ==
 154             IOAPIC_TRIGGER_LEVEL) {
 155             /* level triggered */
 156             if (level) {
 157                 s->irr |= mask;
 158                 ioapic_service(s);
 159             } else {
 160                 s->irr &= ~mask;
 161             }
 162         } else {
 163             /* edge triggered */
 164             if (level) {
 165                 s->irr |= mask;
 166                 ioapic_service(s);
 167             }
 168         }
 169     }
 170 }
 171
 172 void ioapic_eoi_broadcast(int vector)
 173 {
 174     IOAPICState *s;
 175     uint64_t entry;
 176     int i, n;
 177
 178     for (i = 0; i < MAX_IOAPICS; i++) {
 179         s = ioapics[i];
 180         if (!s) {
 181             continue;
 182         }
 183         for (n = 0; n < IOAPIC_NUM_PINS; n++) {
 184             entry = s->ioredtbl[n];
 185             if ((entry & IOAPIC_LVT_REMOTE_IRR)
 186                 && (entry & IOAPIC_VECTOR_MASK) == vector) {
 187                 s->ioredtbl[n] = entry & ~IOAPIC_LVT_REMOTE_IRR;
 188                 if (!(entry & IOAPIC_LVT_MASKED) && (s->irr & (1 << n))) {
 189                     ioapic_service(s);
 190                 }
 191             }
 192         }
 193     }
 194 }
 195
 196 static uint32_t ioapic_mem_readl(void *opaque, target_phys_addr_t addr)
 197 {
 198     IOAPICState *s = opaque;
 199     int index;
 200     uint32_t val = 0;
 201
 202     switch (addr & 0xff) {
 203     case IOAPIC_IOREGSEL:
 204         val = s->ioregsel;
 205         break;
 206     case IOAPIC_IOWIN:
 207         switch (s->ioregsel) {
 208         case IOAPIC_REG_ID:
 209             val = s->id << IOAPIC_ID_SHIFT;
 210             break;
 211         case IOAPIC_REG_VER:
 212             val = IOAPIC_VERSION |
 213                 ((IOAPIC_NUM_PINS - 1) << IOAPIC_VER_ENTRIES_SHIFT);
 214             break;
 215         case IOAPIC_REG_ARB:
 216             val = 0;
 217             break;
 218         default:
 219             index = (s->ioregsel - IOAPIC_REG_REDTBL_BASE) >> 1;
 220             if (index >= 0 && index < IOAPIC_NUM_PINS) {
 221                 if (s->ioregsel & 1) {
 222                     val = s->ioredtbl[index] >> 32;
 223                 } else {
 224                     val = s->ioredtbl[index] & 0xffffffff;
 225                 }
 226             }
 227         }
 228         DPRINTF("read: %08x = %08x\n", s->ioregsel, val);
 229         break;
 230     }
 231     return val;
 232 }
 233
 234 static void
 235 ioapic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
 236 {
 237     IOAPICState *s = opaque;
 238     int index;
 239
 240     switch (addr & 0xff) {
 241     case IOAPIC_IOREGSEL:
 242         s->ioregsel = val;
 243         break;
 244     case IOAPIC_IOWIN:
 245         DPRINTF("write: %08x = %08x\n", s->ioregsel, val);
 246         switch (s->ioregsel) {
 247         case IOAPIC_REG_ID:
 248             s->id = (val >> IOAPIC_ID_SHIFT) & IOAPIC_ID_MASK;
 249             break;
 250         case IOAPIC_REG_VER:
 251         case IOAPIC_REG_ARB:
 252             break;
 253         default:
 254             index = (s->ioregsel - IOAPIC_REG_REDTBL_BASE) >> 1;
 255             if (index >= 0 && index < IOAPIC_NUM_PINS) {
 256                 if (s->ioregsel & 1) {
 257                     s->ioredtbl[index] &= 0xffffffff;
 258                     s->ioredtbl[index] |= (uint64_t)val << 32;
 259                 } else {
 260                     s->ioredtbl[index] &= ~0xffffffffULL;
 261                     s->ioredtbl[index] |= val;
 262                 }
 263                 ioapic_service(s);
 264             }
 265         }
 266         break;
 267     }
 268 }
 269
 270 static int ioapic_post_load(void *opaque, int version_id)
 271 {
 272     IOAPICState *s = opaque;
 273
 274     if (version_id == 1) {
 275         /* set sane value */
 276         s->irr = 0;
 277     }
 278     return 0;
 279 }
 280
 281 static const VMStateDescription vmstate_ioapic = {
 282     .name = "ioapic",
 283     .version_id = 3,
 284     .post_load = ioapic_post_load,
 285     .minimum_version_id = 1,
 286     .minimum_version_id_old = 1,
 287     .fields = (VMStateField[]) {
 288         VMSTATE_UINT8(id, IOAPICState),
 289         VMSTATE_UINT8(ioregsel, IOAPICState),
 290         VMSTATE_UNUSED_V(2, 8), /* to account for qemu-kvm's v2 format */
 291         VMSTATE_UINT32_V(irr, IOAPICState, 2),
 292         VMSTATE_UINT64_ARRAY(ioredtbl, IOAPICState, IOAPIC_NUM_PINS),
 293         VMSTATE_END_OF_LIST()
 294     }
 295 };
 296
 297 static void ioapic_reset(DeviceState *d)
 298 {
 299     IOAPICState *s = DO_UPCAST(IOAPICState, busdev.qdev, d);
 300     int i;
 301
 302     s->id = 0;
 303     s->ioregsel = 0;
 304     s->irr = 0;
 305     for (i = 0; i < IOAPIC_NUM_PINS; i++) {
 306         s->ioredtbl[i] = 1 << IOAPIC_LVT_MASKED_SHIFT;
 307     }
 308 }
 309
 310 static CPUReadMemoryFunc * const ioapic_mem_read[3] = {
 311     ioapic_mem_readl,
 312     ioapic_mem_readl,
 313     ioapic_mem_readl,
 314 };
 315
 316 static CPUWriteMemoryFunc * const ioapic_mem_write[3] = {
 317     ioapic_mem_writel,
 318     ioapic_mem_writel,
 319     ioapic_mem_writel,
 320 };
 321
 322 static int ioapic_init1(SysBusDevice *dev)
 323 {
 324     IOAPICState *s = FROM_SYSBUS(IOAPICState, dev);
 325     int io_memory;
 326     static int ioapic_no;
 327
 328     if (ioapic_no >= MAX_IOAPICS) {
 329         return -1;
 330     }
 331
 332     io_memory = cpu_register_io_memory(ioapic_mem_read,
 333                                        ioapic_mem_write, s,
 334                                        DEVICE_NATIVE_ENDIAN);
 335     sysbus_init_mmio(dev, 0x1000, io_memory);
 336
 337     qdev_init_gpio_in(&dev->qdev, ioapic_set_irq, IOAPIC_NUM_PINS);
 338
 339     ioapics[ioapic_no++] = s;
 340
 341     return 0;
 342 }
 343
 344 static SysBusDeviceInfo ioapic_info = {
 345     .init = ioapic_init1,
 346     .qdev.name = "ioapic",
 347     .qdev.size = sizeof(IOAPICState),
 348     .qdev.vmsd = &vmstate_ioapic,
 349     .qdev.reset = ioapic_reset,
 350     .qdev.no_user = 1,
 351 };
 352
 353 static void ioapic_register_devices(void)
 354 {
 355     sysbus_register_withprop(&ioapic_info);
 356 }
 357
 358 device_init(ioapic_register_devices)