hw/intc/apic_common.c

   1 /*
   2  *  APIC support - common bits of emulated and KVM kernel model
   3  *
   4  *  Copyright (c) 2004-2005 Fabrice Bellard
   5  *  Copyright (c) 2011      Jan Kiszka, Siemens AG
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  19  */
  20 #include "hw/i386/apic.h"
  21 #include "hw/i386/apic_internal.h"
  22 #include "trace.h"
  23 #include "sysemu/kvm.h"
  24 #include "hw/qdev.h"
  25 #include "hw/sysbus.h"
  26
  27 static int apic_irq_delivered;
  28 bool apic_report_tpr_access;
  29
  30 void cpu_set_apic_base(DeviceState *d, uint64_t val)
  31 {
  32     trace_cpu_set_apic_base(val);
  33
  34     if (d) {
  35         APICCommonState *s = APIC_COMMON(d);
  36         APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
  37         info->set_base(s, val);
  38     }
  39 }
  40
  41 uint64_t cpu_get_apic_base(DeviceState *d)
  42 {
  43     if (d) {
  44         APICCommonState *s = APIC_COMMON(d);
  45         trace_cpu_get_apic_base((uint64_t)s->apicbase);
  46         return s->apicbase;
  47     } else {
  48         trace_cpu_get_apic_base(MSR_IA32_APICBASE_BSP);
  49         return MSR_IA32_APICBASE_BSP;
  50     }
  51 }
  52
  53 void cpu_set_apic_tpr(DeviceState *d, uint8_t val)
  54 {
  55     APICCommonState *s;
  56     APICCommonClass *info;
  57
  58     if (!d) {
  59         return;
  60     }
  61
  62     s = APIC_COMMON(d);
  63     info = APIC_COMMON_GET_CLASS(s);
  64
  65     info->set_tpr(s, val);
  66 }
  67
  68 uint8_t cpu_get_apic_tpr(DeviceState *d)
  69 {
  70     APICCommonState *s;
  71     APICCommonClass *info;
  72
  73     if (!d) {
  74         return 0;
  75     }
  76
  77     s = APIC_COMMON(d);
  78     info = APIC_COMMON_GET_CLASS(s);
  79
  80     return info->get_tpr(s);
  81 }
  82
  83 void apic_enable_tpr_access_reporting(DeviceState *d, bool enable)
  84 {
  85     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
  86     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
  87
  88     apic_report_tpr_access = enable;
  89     if (info->enable_tpr_reporting) {
  90         info->enable_tpr_reporting(s, enable);
  91     }
  92 }
  93
  94 void apic_enable_vapic(DeviceState *d, hwaddr paddr)
  95 {
  96     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
  97     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
  98
  99     s->vapic_paddr = paddr;
 100     info->vapic_base_update(s);
 101 }
 102
 103 void apic_handle_tpr_access_report(DeviceState *d, target_ulong ip,
 104                                    TPRAccess access)
 105 {
 106     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 107
 108     vapic_report_tpr_access(s->vapic, CPU(s->cpu), ip, access);
 109 }
 110
 111 void apic_report_irq_delivered(int delivered)
 112 {
 113     apic_irq_delivered += delivered;
 114
 115     trace_apic_report_irq_delivered(apic_irq_delivered);
 116 }
 117
 118 void apic_reset_irq_delivered(void)
 119 {
 120     trace_apic_reset_irq_delivered(apic_irq_delivered);
 121
 122     apic_irq_delivered = 0;
 123 }
 124
 125 int apic_get_irq_delivered(void)
 126 {
 127     trace_apic_get_irq_delivered(apic_irq_delivered);
 128
 129     return apic_irq_delivered;
 130 }
 131
 132 void apic_deliver_nmi(DeviceState *d)
 133 {
 134     APICCommonState *s = APIC_COMMON(d);
 135     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 136
 137     info->external_nmi(s);
 138 }
 139
 140 bool apic_next_timer(APICCommonState *s, int64_t current_time)
 141 {
 142     int64_t d;
 143
 144     /* We need to store the timer state separately to support APIC
 145      * implementations that maintain a non-QEMU timer, e.g. inside the
 146      * host kernel. This open-coded state allows us to migrate between
 147      * both models. */
 148     s->timer_expiry = -1;
 149
 150     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_MASKED) {
 151         return false;
 152     }
 153
 154     d = (current_time - s->initial_count_load_time) >> s->count_shift;
 155
 156     if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
 157         if (!s->initial_count) {
 158             return false;
 159         }
 160         d = ((d / ((uint64_t)s->initial_count + 1)) + 1) *
 161             ((uint64_t)s->initial_count + 1);
 162     } else {
 163         if (d >= s->initial_count) {
 164             return false;
 165         }
 166         d = (uint64_t)s->initial_count + 1;
 167     }
 168     s->next_time = s->initial_count_load_time + (d << s->count_shift);
 169     s->timer_expiry = s->next_time;
 170     return true;
 171 }
 172
 173 void apic_init_reset(DeviceState *d)
 174 {
 175     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 176     int i;
 177
 178     if (!s) {
 179         return;
 180     }
 181     s->tpr = 0;
 182     s->spurious_vec = 0xff;
 183     s->log_dest = 0;
 184     s->dest_mode = 0xf;
 185     memset(s->isr, 0, sizeof(s->isr));
 186     memset(s->tmr, 0, sizeof(s->tmr));
 187     memset(s->irr, 0, sizeof(s->irr));
 188     for (i = 0; i < APIC_LVT_NB; i++) {
 189         s->lvt[i] = APIC_LVT_MASKED;
 190     }
 191     s->esr = 0;
 192     memset(s->icr, 0, sizeof(s->icr));
 193     s->divide_conf = 0;
 194     s->count_shift = 0;
 195     s->initial_count = 0;
 196     s->initial_count_load_time = 0;
 197     s->next_time = 0;
 198     s->wait_for_sipi = 1;
 199
 200     if (s->timer) {
 201         qemu_del_timer(s->timer);
 202     }
 203     s->timer_expiry = -1;
 204 }
 205
 206 void apic_designate_bsp(DeviceState *d)
 207 {
 208     if (d == NULL) {
 209         return;
 210     }
 211
 212     APICCommonState *s = APIC_COMMON(d);
 213     s->apicbase |= MSR_IA32_APICBASE_BSP;
 214 }
 215
 216 static void apic_reset_common(DeviceState *d)
 217 {
 218     APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);
 219     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 220     bool bsp;
 221
 222     bsp = cpu_is_bsp(s->cpu);
 223     s->apicbase = APIC_DEFAULT_ADDRESS |
 224         (bsp ? MSR_IA32_APICBASE_BSP : 0) | MSR_IA32_APICBASE_ENABLE;
 225
 226     s->vapic_paddr = 0;
 227     info->vapic_base_update(s);
 228
 229     apic_init_reset(d);
 230
 231     if (bsp) {
 232         /*
 233          * LINT0 delivery mode on CPU #0 is set to ExtInt at initialization
 234          * time typically by BIOS, so PIC interrupt can be delivered to the
 235          * processor when local APIC is enabled.
 236          */
 237         s->lvt[APIC_LVT_LINT0] = 0x700;
 238     }
 239 }
 240
 241 /* This function is only used for old state version 1 and 2 */
 242 static int apic_load_old(QEMUFile *f, void *opaque, int version_id)
 243 {
 244     APICCommonState *s = opaque;
 245     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 246     int i;
 247
 248     if (version_id > 2) {
 249         return -EINVAL;
 250     }
 251
 252     /* XXX: what if the base changes? (registered memory regions) */
 253     qemu_get_be32s(f, &s->apicbase);
 254     qemu_get_8s(f, &s->id);
 255     qemu_get_8s(f, &s->arb_id);
 256     qemu_get_8s(f, &s->tpr);
 257     qemu_get_be32s(f, &s->spurious_vec);
 258     qemu_get_8s(f, &s->log_dest);
 259     qemu_get_8s(f, &s->dest_mode);
 260     for (i = 0; i < 8; i++) {
 261         qemu_get_be32s(f, &s->isr[i]);
 262         qemu_get_be32s(f, &s->tmr[i]);
 263         qemu_get_be32s(f, &s->irr[i]);
 264     }
 265     for (i = 0; i < APIC_LVT_NB; i++) {
 266         qemu_get_be32s(f, &s->lvt[i]);
 267     }
 268     qemu_get_be32s(f, &s->esr);
 269     qemu_get_be32s(f, &s->icr[0]);
 270     qemu_get_be32s(f, &s->icr[1]);
 271     qemu_get_be32s(f, &s->divide_conf);
 272     s->count_shift = qemu_get_be32(f);
 273     qemu_get_be32s(f, &s->initial_count);
 274     s->initial_count_load_time = qemu_get_be64(f);
 275     s->next_time = qemu_get_be64(f);
 276
 277     if (version_id >= 2) {
 278         s->timer_expiry = qemu_get_be64(f);
 279     }
 280
 281     if (info->post_load) {
 282         info->post_load(s);
 283     }
 284     return 0;
 285 }
 286
 287 static int apic_init_common(ICCDevice *dev)
 288 {
 289     APICCommonState *s = APIC_COMMON(dev);
 290     APICCommonClass *info;
 291     static DeviceState *vapic;
 292     static int apic_no;
 293     static bool mmio_registered;
 294
 295     if (apic_no >= MAX_APICS) {
 296         return -1;
 297     }
 298     s->idx = apic_no++;
 299
 300     info = APIC_COMMON_GET_CLASS(s);
 301     info->init(s);
 302     if (!mmio_registered) {
 303         ICCBus *b = ICC_BUS(qdev_get_parent_bus(DEVICE(dev)));
 304         memory_region_add_subregion(b->apic_address_space, 0, &s->io_memory);
 305         mmio_registered = true;
 306     }
 307
 308     /* Note: We need at least 1M to map the VAPIC option ROM */
 309     if (!vapic && s->vapic_control & VAPIC_ENABLE_MASK &&
 310         ram_size >= 1024 * 1024) {
 311         vapic = sysbus_create_simple("kvmvapic", -1, NULL);
 312     }
 313     s->vapic = vapic;
 314     if (apic_report_tpr_access && info->enable_tpr_reporting) {
 315         info->enable_tpr_reporting(s, true);
 316     }
 317
 318     return 0;
 319 }
 320
 321 static void apic_dispatch_pre_save(void *opaque)
 322 {
 323     APICCommonState *s = APIC_COMMON(opaque);
 324     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 325
 326     if (info->pre_save) {
 327         info->pre_save(s);
 328     }
 329 }
 330
 331 static int apic_dispatch_post_load(void *opaque, int version_id)
 332 {
 333     APICCommonState *s = APIC_COMMON(opaque);
 334     APICCommonClass *info = APIC_COMMON_GET_CLASS(s);
 335
 336     if (info->post_load) {
 337         info->post_load(s);
 338     }
 339     return 0;
 340 }
 341
 342 static const VMStateDescription vmstate_apic_common = {
 343     .name = "apic",
 344     .version_id = 3,
 345     .minimum_version_id = 3,
 346     .minimum_version_id_old = 1,
 347     .load_state_old = apic_load_old,
 348     .pre_save = apic_dispatch_pre_save,
 349     .post_load = apic_dispatch_post_load,
 350     .fields = (VMStateField[]) {
 351         VMSTATE_UINT32(apicbase, APICCommonState),
 352         VMSTATE_UINT8(id, APICCommonState),
 353         VMSTATE_UINT8(arb_id, APICCommonState),
 354         VMSTATE_UINT8(tpr, APICCommonState),
 355         VMSTATE_UINT32(spurious_vec, APICCommonState),
 356         VMSTATE_UINT8(log_dest, APICCommonState),
 357         VMSTATE_UINT8(dest_mode, APICCommonState),
 358         VMSTATE_UINT32_ARRAY(isr, APICCommonState, 8),
 359         VMSTATE_UINT32_ARRAY(tmr, APICCommonState, 8),
 360         VMSTATE_UINT32_ARRAY(irr, APICCommonState, 8),
 361         VMSTATE_UINT32_ARRAY(lvt, APICCommonState, APIC_LVT_NB),
 362         VMSTATE_UINT32(esr, APICCommonState),
 363         VMSTATE_UINT32_ARRAY(icr, APICCommonState, 2),
 364         VMSTATE_UINT32(divide_conf, APICCommonState),
 365         VMSTATE_INT32(count_shift, APICCommonState),
 366         VMSTATE_UINT32(initial_count, APICCommonState),
 367         VMSTATE_INT64(initial_count_load_time, APICCommonState),
 368         VMSTATE_INT64(next_time, APICCommonState),
 369         VMSTATE_INT64(timer_expiry,
 370                       APICCommonState), /* open-coded timer state */
 371         VMSTATE_END_OF_LIST()
 372     }
 373 };
 374
 375 static Property apic_properties_common[] = {
 376     DEFINE_PROP_UINT8("id", APICCommonState, id, -1),
 377     DEFINE_PROP_BIT("vapic", APICCommonState, vapic_control, VAPIC_ENABLE_BIT,
 378                     true),
 379     DEFINE_PROP_END_OF_LIST(),
 380 };
 381
 382 static void apic_common_class_init(ObjectClass *klass, void *data)
 383 {
 384     ICCDeviceClass *idc = ICC_DEVICE_CLASS(klass);
 385     DeviceClass *dc = DEVICE_CLASS(klass);
 386
 387     dc->vmsd = &vmstate_apic_common;
 388     dc->reset = apic_reset_common;
 389     dc->no_user = 1;
 390     dc->props = apic_properties_common;
 391     idc->init = apic_init_common;
 392 }
 393
 394 static const TypeInfo apic_common_type = {
 395     .name = TYPE_APIC_COMMON,
 396     .parent = TYPE_ICC_DEVICE,
 397     .instance_size = sizeof(APICCommonState),
 398     .class_size = sizeof(APICCommonClass),
 399     .class_init = apic_common_class_init,
 400     .abstract = true,
 401 };
 402
 403 static void register_types(void)
 404 {
 405     type_register_static(&apic_common_type);
 406 }
 407
 408 type_init(register_types)