hw/acpi/piix4.c - qemu - Git at Google

 /*
  * ACPI implementation
  *
  * Copyright (c) 2006 Fabrice Bellard
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License version 2 as published by the Free Software Foundation.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, see <http://www.gnu.org/licenses/>
  *
  * Contributions after 2012-01-13 are licensed under the terms of the
  * GNU GPL, version 2 or (at your option) any later version.
  */

 #include "qemu/osdep.h"
 #include "hw/i386/pc.h"
 #include "hw/irq.h"
 #include "hw/isa/apm.h"
 #include "hw/i2c/pm_smbus.h"
 #include "hw/pci/pci.h"
 #include "hw/qdev-properties.h"
 #include "hw/acpi/acpi.h"
 #include "sysemu/reset.h"
 #include "sysemu/runstate.h"
 #include "sysemu/sysemu.h"
 #include "qapi/error.h"
 #include "qemu/range.h"
 #include "exec/address-spaces.h"
 #include "hw/acpi/piix4.h"
 #include "hw/acpi/pcihp.h"
 #include "hw/acpi/cpu_hotplug.h"
 #include "hw/acpi/cpu.h"
 #include "hw/hotplug.h"
 #include "hw/mem/pc-dimm.h"
 #include "hw/acpi/memory_hotplug.h"
 #include "hw/acpi/acpi_dev_interface.h"
 #include "hw/xen/xen.h"
 #include "migration/qemu-file-types.h"
 #include "migration/vmstate.h"
 #include "hw/core/cpu.h"
 #include "trace.h"

 #define GPE_BASE 0xafe0
 #define GPE_LEN 4

 struct pci_status {
     uint32_t up; /* deprecated, maintained for migration compatibility */
     uint32_t down;
 };

 typedef struct PIIX4PMState {
     /*< private >*/
     PCIDevice parent_obj;
     /*< public >*/

     MemoryRegion io;
     uint32_t io_base;

     MemoryRegion io_gpe;
     ACPIREGS ar;

     APMState apm;

     PMSMBus smb;
     uint32_t smb_io_base;

     qemu_irq irq;
     qemu_irq smi_irq;
     int smm_enabled;
     Notifier machine_ready;
     Notifier powerdown_notifier;

     AcpiPciHpState acpi_pci_hotplug;
     bool use_acpi_pci_hotplug;

     uint8_t disable_s3;
     uint8_t disable_s4;
     uint8_t s4_val;

     bool cpu_hotplug_legacy;
     AcpiCpuHotplug gpe_cpu;
     CPUHotplugState cpuhp_state;

     MemHotplugState acpi_memory_hotplug;
 } PIIX4PMState;

 #define PIIX4_PM(obj) \
     OBJECT_CHECK(PIIX4PMState, (obj), TYPE_PIIX4_PM)

 static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
                                            PCIBus *bus, PIIX4PMState *s);

 #define ACPI_ENABLE 0xf1
 #define ACPI_DISABLE 0xf0

 static void pm_tmr_timer(ACPIREGS *ar)
 {
     PIIX4PMState *s = container_of(ar, PIIX4PMState, ar);
     acpi_update_sci(&s->ar, s->irq);
 }

 static void apm_ctrl_changed(uint32_t val, void *arg)
 {
     PIIX4PMState *s = arg;
     PCIDevice *d = PCI_DEVICE(s);

     /* ACPI specs 3.0, 4.7.2.5 */
     acpi_pm1_cnt_update(&s->ar, val == ACPI_ENABLE, val == ACPI_DISABLE);
     if (val == ACPI_ENABLE || val == ACPI_DISABLE) {
         return;
     }

     if (d->config[0x5b] & (1 << 1)) {
         if (s->smi_irq) {
             qemu_irq_raise(s->smi_irq);
         }
     }
 }

 static void pm_io_space_update(PIIX4PMState *s)
 {
     PCIDevice *d = PCI_DEVICE(s);

     s->io_base = le32_to_cpu(*(uint32_t *)(d->config + 0x40));
     s->io_base &= 0xffc0;

     memory_region_transaction_begin();
     memory_region_set_enabled(&s->io, d->config[0x80] & 1);
     memory_region_set_address(&s->io, s->io_base);
     memory_region_transaction_commit();
 }

 static void smbus_io_space_update(PIIX4PMState *s)
 {
     PCIDevice *d = PCI_DEVICE(s);

     s->smb_io_base = le32_to_cpu(*(uint32_t *)(d->config + 0x90));
     s->smb_io_base &= 0xffc0;

     memory_region_transaction_begin();
     memory_region_set_enabled(&s->smb.io, d->config[0xd2] & 1);
     memory_region_set_address(&s->smb.io, s->smb_io_base);
     memory_region_transaction_commit();
 }

 static void pm_write_config(PCIDevice *d,
                             uint32_t address, uint32_t val, int len)
 {
     pci_default_write_config(d, address, val, len);
     if (range_covers_byte(address, len, 0x80) ||
         ranges_overlap(address, len, 0x40, 4)) {
         pm_io_space_update((PIIX4PMState *)d);
     }
     if (range_covers_byte(address, len, 0xd2) ||
         ranges_overlap(address, len, 0x90, 4)) {
         smbus_io_space_update((PIIX4PMState *)d);
     }
 }

 static int vmstate_acpi_post_load(void *opaque, int version_id)
 {
     PIIX4PMState *s = opaque;

     pm_io_space_update(s);
     smbus_io_space_update(s);
     return 0;
 }

 #define VMSTATE_GPE_ARRAY(_field, _state)                            \
  {                                                                   \
      .name       = (stringify(_field)),                              \
      .version_id = 0,                                                \
      .info       = &vmstate_info_uint16,                             \
      .size       = sizeof(uint16_t),                                 \
      .flags      = VMS_SINGLE | VMS_POINTER,                         \
      .offset     = vmstate_offset_pointer(_state, _field, uint8_t),  \
  }

 static const VMStateDescription vmstate_gpe = {
     .name = "gpe",
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
         VMSTATE_GPE_ARRAY(sts, ACPIGPE),
         VMSTATE_GPE_ARRAY(en, ACPIGPE),
         VMSTATE_END_OF_LIST()
     }
 };

 static const VMStateDescription vmstate_pci_status = {
     .name = "pci_status",
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(up, struct AcpiPciHpPciStatus),
         VMSTATE_UINT32(down, struct AcpiPciHpPciStatus),
         VMSTATE_END_OF_LIST()
     }
 };

 static int acpi_load_old(QEMUFile *f, void *opaque, int version_id)
 {
     PIIX4PMState *s = opaque;
     int ret, i;
     uint16_t temp;

     ret = pci_device_load(PCI_DEVICE(s), f);
     if (ret < 0) {
         return ret;
     }
     qemu_get_be16s(f, &s->ar.pm1.evt.sts);
     qemu_get_be16s(f, &s->ar.pm1.evt.en);
     qemu_get_be16s(f, &s->ar.pm1.cnt.cnt);

     ret = vmstate_load_state(f, &vmstate_apm, &s->apm, 1);
     if (ret) {
         return ret;
     }

     timer_get(f, s->ar.tmr.timer);
     qemu_get_sbe64s(f, &s->ar.tmr.overflow_time);

     qemu_get_be16s(f, (uint16_t *)s->ar.gpe.sts);
     for (i = 0; i < 3; i++) {
         qemu_get_be16s(f, &temp);
     }

     qemu_get_be16s(f, (uint16_t *)s->ar.gpe.en);
     for (i = 0; i < 3; i++) {
         qemu_get_be16s(f, &temp);
     }

     ret = vmstate_load_state(f, &vmstate_pci_status,
         &s->acpi_pci_hotplug.acpi_pcihp_pci_status[ACPI_PCIHP_BSEL_DEFAULT], 1);
     return ret;
 }

 static bool vmstate_test_use_acpi_pci_hotplug(void *opaque, int version_id)
 {
     PIIX4PMState *s = opaque;
     return s->use_acpi_pci_hotplug;
 }

 static bool vmstate_test_no_use_acpi_pci_hotplug(void *opaque, int version_id)
 {
     PIIX4PMState *s = opaque;
     return !s->use_acpi_pci_hotplug;
 }

 static bool vmstate_test_use_memhp(void *opaque)
 {
     PIIX4PMState *s = opaque;
     return s->acpi_memory_hotplug.is_enabled;
 }

 static const VMStateDescription vmstate_memhp_state = {
     .name = "piix4_pm/memhp",
     .version_id = 1,
     .minimum_version_id = 1,
     .minimum_version_id_old = 1,
     .needed = vmstate_test_use_memhp,
     .fields      = (VMStateField[]) {
         VMSTATE_MEMORY_HOTPLUG(acpi_memory_hotplug, PIIX4PMState),
         VMSTATE_END_OF_LIST()
     }
 };

 static bool vmstate_test_use_cpuhp(void *opaque)
 {
     PIIX4PMState *s = opaque;
     return !s->cpu_hotplug_legacy;
 }

 static int vmstate_cpuhp_pre_load(void *opaque)
 {
     Object *obj = OBJECT(opaque);
     object_property_set_bool(obj, false, "cpu-hotplug-legacy", &error_abort);
     return 0;
 }

 static const VMStateDescription vmstate_cpuhp_state = {
     .name = "piix4_pm/cpuhp",
     .version_id = 1,
     .minimum_version_id = 1,
     .minimum_version_id_old = 1,
     .needed = vmstate_test_use_cpuhp,
     .pre_load = vmstate_cpuhp_pre_load,
     .fields      = (VMStateField[]) {
         VMSTATE_CPU_HOTPLUG(cpuhp_state, PIIX4PMState),
         VMSTATE_END_OF_LIST()
     }
 };

 static bool piix4_vmstate_need_smbus(void *opaque, int version_id)
 {
     return pm_smbus_vmstate_needed();
 }

 /* qemu-kvm 1.2 uses version 3 but advertised as 2
  * To support incoming qemu-kvm 1.2 migration, change version_id
  * and minimum_version_id to 2 below (which breaks migration from
  * qemu 1.2).
  *
  */
 static const VMStateDescription vmstate_acpi = {
     .name = "piix4_pm",
     .version_id = 3,
     .minimum_version_id = 3,
     .minimum_version_id_old = 1,
     .load_state_old = acpi_load_old,
     .post_load = vmstate_acpi_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_PCI_DEVICE(parent_obj, PIIX4PMState),
         VMSTATE_UINT16(ar.pm1.evt.sts, PIIX4PMState),
         VMSTATE_UINT16(ar.pm1.evt.en, PIIX4PMState),
         VMSTATE_UINT16(ar.pm1.cnt.cnt, PIIX4PMState),
         VMSTATE_STRUCT(apm, PIIX4PMState, 0, vmstate_apm, APMState),
         VMSTATE_STRUCT_TEST(smb, PIIX4PMState, piix4_vmstate_need_smbus, 3,
                             pmsmb_vmstate, PMSMBus),
         VMSTATE_TIMER_PTR(ar.tmr.timer, PIIX4PMState),
         VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState),
         VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE),
         VMSTATE_STRUCT_TEST(
             acpi_pci_hotplug.acpi_pcihp_pci_status[ACPI_PCIHP_BSEL_DEFAULT],
             PIIX4PMState,
             vmstate_test_no_use_acpi_pci_hotplug,
             2, vmstate_pci_status,
             struct AcpiPciHpPciStatus),
         VMSTATE_PCI_HOTPLUG(acpi_pci_hotplug, PIIX4PMState,
                             vmstate_test_use_acpi_pci_hotplug),
         VMSTATE_END_OF_LIST()
     },
     .subsections = (const VMStateDescription*[]) {
          &vmstate_memhp_state,
          &vmstate_cpuhp_state,
          NULL
     }
 };

 static void piix4_reset(void *opaque)
 {
     PIIX4PMState *s = opaque;
     PCIDevice *d = PCI_DEVICE(s);
     uint8_t *pci_conf = d->config;

     pci_conf[0x58] = 0;
     pci_conf[0x59] = 0;
     pci_conf[0x5a] = 0;
     pci_conf[0x5b] = 0;

     pci_conf[0x40] = 0x01; /* PM io base read only bit */
     pci_conf[0x80] = 0;

     if (!s->smm_enabled) {
         /* Mark SMM as already inited (until KVM supports SMM). */
         pci_conf[0x5B] = 0x02;
     }
     pm_io_space_update(s);
     acpi_pcihp_reset(&s->acpi_pci_hotplug);
 }

 static void piix4_pm_powerdown_req(Notifier *n, void *opaque)
 {
     PIIX4PMState *s = container_of(n, PIIX4PMState, powerdown_notifier);

     assert(s != NULL);
     acpi_pm1_evt_power_down(&s->ar);
 }

 static void piix4_device_pre_plug_cb(HotplugHandler *hotplug_dev,
                                     DeviceState *dev, Error **errp)
 {
     PIIX4PMState *s = PIIX4_PM(hotplug_dev);

     if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
         acpi_pcihp_device_pre_plug_cb(hotplug_dev, dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         if (!s->acpi_memory_hotplug.is_enabled) {
             error_setg(errp,
                 "memory hotplug is not enabled: %s.memory-hotplug-support "
                 "is not set", object_get_typename(OBJECT(s)));
         }
     } else if (
                !object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
         error_setg(errp, "acpi: device pre plug request for not supported"
                    " device type: %s", object_get_typename(OBJECT(dev)));
     }
 }

 static void piix4_device_plug_cb(HotplugHandler *hotplug_dev,
                                  DeviceState *dev, Error **errp)
 {
     PIIX4PMState *s = PIIX4_PM(hotplug_dev);

     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
             nvdimm_acpi_plug_cb(hotplug_dev, dev);
         } else {
             acpi_memory_plug_cb(hotplug_dev, &s->acpi_memory_hotplug,
                                 dev, errp);
         }
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
         acpi_pcihp_device_plug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
         if (s->cpu_hotplug_legacy) {
             legacy_acpi_cpu_plug_cb(hotplug_dev, &s->gpe_cpu, dev, errp);
         } else {
             acpi_cpu_plug_cb(hotplug_dev, &s->cpuhp_state, dev, errp);
         }
     } else {
         g_assert_not_reached();
     }
 }

 static void piix4_device_unplug_request_cb(HotplugHandler *hotplug_dev,
                                            DeviceState *dev, Error **errp)
 {
     PIIX4PMState *s = PIIX4_PM(hotplug_dev);

     if (s->acpi_memory_hotplug.is_enabled &&
         object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         acpi_memory_unplug_request_cb(hotplug_dev, &s->acpi_memory_hotplug,
                                       dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
         acpi_pcihp_device_unplug_request_cb(hotplug_dev, &s->acpi_pci_hotplug,
                                             dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
                !s->cpu_hotplug_legacy) {
         acpi_cpu_unplug_request_cb(hotplug_dev, &s->cpuhp_state, dev, errp);
     } else {
         error_setg(errp, "acpi: device unplug request for not supported device"
                    " type: %s", object_get_typename(OBJECT(dev)));
     }
 }

 static void piix4_device_unplug_cb(HotplugHandler *hotplug_dev,
                                    DeviceState *dev, Error **errp)
 {
     PIIX4PMState *s = PIIX4_PM(hotplug_dev);

     if (s->acpi_memory_hotplug.is_enabled &&
         object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
         acpi_memory_unplug_cb(&s->acpi_memory_hotplug, dev, errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
         acpi_pcihp_device_unplug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev,
                                     errp);
     } else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
                !s->cpu_hotplug_legacy) {
         acpi_cpu_unplug_cb(&s->cpuhp_state, dev, errp);
     } else {
         error_setg(errp, "acpi: device unplug for not supported device"
                    " type: %s", object_get_typename(OBJECT(dev)));
     }
 }

 static void piix4_pm_machine_ready(Notifier *n, void *opaque)
 {
     PIIX4PMState *s = container_of(n, PIIX4PMState, machine_ready);
     PCIDevice *d = PCI_DEVICE(s);
     MemoryRegion *io_as = pci_address_space_io(d);
     uint8_t *pci_conf;

     pci_conf = d->config;
     pci_conf[0x5f] = 0x10 |
         (memory_region_present(io_as, 0x378) ? 0x80 : 0);
     pci_conf[0x63] = 0x60;
     pci_conf[0x67] = (memory_region_present(io_as, 0x3f8) ? 0x08 : 0) |
         (memory_region_present(io_as, 0x2f8) ? 0x90 : 0);
 }

 static void piix4_pm_add_propeties(PIIX4PMState *s)
 {
     static const uint8_t acpi_enable_cmd = ACPI_ENABLE;
     static const uint8_t acpi_disable_cmd = ACPI_DISABLE;
     static const uint32_t gpe0_blk = GPE_BASE;
     static const uint32_t gpe0_blk_len = GPE_LEN;
     static const uint16_t sci_int = 9;

     object_property_add_uint8_ptr(OBJECT(s), ACPI_PM_PROP_ACPI_ENABLE_CMD,
                                   &acpi_enable_cmd, NULL);
     object_property_add_uint8_ptr(OBJECT(s), ACPI_PM_PROP_ACPI_DISABLE_CMD,
                                   &acpi_disable_cmd, NULL);
     object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_GPE0_BLK,
                                   &gpe0_blk, NULL);
     object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_GPE0_BLK_LEN,
                                   &gpe0_blk_len, NULL);
     object_property_add_uint16_ptr(OBJECT(s), ACPI_PM_PROP_SCI_INT,
                                   &sci_int, NULL);
     object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_PM_IO_BASE,
                                   &s->io_base, NULL);
 }

 static void piix4_pm_realize(PCIDevice *dev, Error **errp)
 {
     PIIX4PMState *s = PIIX4_PM(dev);
     uint8_t *pci_conf;

     pci_conf = dev->config;
     pci_conf[0x06] = 0x80;
     pci_conf[0x07] = 0x02;
     pci_conf[0x09] = 0x00;
     pci_conf[0x3d] = 0x01; // interrupt pin 1

     /* APM */
     apm_init(dev, &s->apm, apm_ctrl_changed, s);

     if (!s->smm_enabled) {
         /* Mark SMM as already inited to prevent SMM from running.  KVM does not
          * support SMM mode. */
         pci_conf[0x5B] = 0x02;
     }

     /* XXX: which specification is used ? The i82731AB has different
        mappings */
     pci_conf[0x90] = s->smb_io_base | 1;
     pci_conf[0x91] = s->smb_io_base >> 8;
     pci_conf[0xd2] = 0x09;
     pm_smbus_init(DEVICE(dev), &s->smb, true);
     memory_region_set_enabled(&s->smb.io, pci_conf[0xd2] & 1);
     memory_region_add_subregion(pci_address_space_io(dev),
                                 s->smb_io_base, &s->smb.io);

     memory_region_init(&s->io, OBJECT(s), "piix4-pm", 64);
     memory_region_set_enabled(&s->io, false);
     memory_region_add_subregion(pci_address_space_io(dev),
                                 0, &s->io);

     acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io);
     acpi_pm1_evt_init(&s->ar, pm_tmr_timer, &s->io);
     acpi_pm1_cnt_init(&s->ar, &s->io, s->disable_s3, s->disable_s4, s->s4_val);
     acpi_gpe_init(&s->ar, GPE_LEN);

     s->powerdown_notifier.notify = piix4_pm_powerdown_req;
     qemu_register_powerdown_notifier(&s->powerdown_notifier);

     s->machine_ready.notify = piix4_pm_machine_ready;
     qemu_add_machine_init_done_notifier(&s->machine_ready);
     qemu_register_reset(piix4_reset, s);

     piix4_acpi_system_hot_add_init(pci_address_space_io(dev),
                                    pci_get_bus(dev), s);
     qbus_set_hotplug_handler(BUS(pci_get_bus(dev)), OBJECT(s), &error_abort);

     piix4_pm_add_propeties(s);
 }

 I2CBus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t smb_io_base,
                       qemu_irq sci_irq, qemu_irq smi_irq,
                       int smm_enabled, DeviceState **piix4_pm)
 {
     DeviceState *dev;
     PIIX4PMState *s;

     dev = DEVICE(pci_create(bus, devfn, TYPE_PIIX4_PM));
     qdev_prop_set_uint32(dev, "smb_io_base", smb_io_base);
     if (piix4_pm) {
         *piix4_pm = dev;
     }

     s = PIIX4_PM(dev);
     s->irq = sci_irq;
     s->smi_irq = smi_irq;
     s->smm_enabled = smm_enabled;
     if (xen_enabled()) {
         s->use_acpi_pci_hotplug = false;
     }

     qdev_init_nofail(dev);

     return s->smb.smbus;
 }

 static uint64_t gpe_readb(void *opaque, hwaddr addr, unsigned width)
 {
     PIIX4PMState *s = opaque;
     uint32_t val = acpi_gpe_ioport_readb(&s->ar, addr);

     trace_piix4_gpe_readb(addr, width, val);
     return val;
 }

 static void gpe_writeb(void *opaque, hwaddr addr, uint64_t val,
                        unsigned width)
 {
     PIIX4PMState *s = opaque;

     trace_piix4_gpe_writeb(addr, width, val);
     acpi_gpe_ioport_writeb(&s->ar, addr, val);
     acpi_update_sci(&s->ar, s->irq);
 }

 static const MemoryRegionOps piix4_gpe_ops = {
     .read = gpe_readb,
     .write = gpe_writeb,
     .valid.min_access_size = 1,
     .valid.max_access_size = 4,
     .impl.min_access_size = 1,
     .impl.max_access_size = 1,
     .endianness = DEVICE_LITTLE_ENDIAN,
 };


 static bool piix4_get_cpu_hotplug_legacy(Object *obj, Error **errp)
 {
     PIIX4PMState *s = PIIX4_PM(obj);

     return s->cpu_hotplug_legacy;
 }

 static void piix4_set_cpu_hotplug_legacy(Object *obj, bool value, Error **errp)
 {
     PIIX4PMState *s = PIIX4_PM(obj);

     assert(!value);
     if (s->cpu_hotplug_legacy && value == false) {
         acpi_switch_to_modern_cphp(&s->gpe_cpu, &s->cpuhp_state,
                                    PIIX4_CPU_HOTPLUG_IO_BASE);
     }
     s->cpu_hotplug_legacy = value;
 }

 static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
                                            PCIBus *bus, PIIX4PMState *s)
 {
     memory_region_init_io(&s->io_gpe, OBJECT(s), &piix4_gpe_ops, s,
                           "acpi-gpe0", GPE_LEN);
     memory_region_add_subregion(parent, GPE_BASE, &s->io_gpe);

     acpi_pcihp_init(OBJECT(s), &s->acpi_pci_hotplug, bus, parent,
                     s->use_acpi_pci_hotplug);

     s->cpu_hotplug_legacy = true;
     object_property_add_bool(OBJECT(s), "cpu-hotplug-legacy",
                              piix4_get_cpu_hotplug_legacy,
                              piix4_set_cpu_hotplug_legacy,
                              NULL);
     legacy_acpi_cpu_hotplug_init(parent, OBJECT(s), &s->gpe_cpu,
                                  PIIX4_CPU_HOTPLUG_IO_BASE);

     if (s->acpi_memory_hotplug.is_enabled) {
         acpi_memory_hotplug_init(parent, OBJECT(s), &s->acpi_memory_hotplug,
                                  ACPI_MEMORY_HOTPLUG_BASE);
     }
 }

 static void piix4_ospm_status(AcpiDeviceIf *adev, ACPIOSTInfoList ***list)
 {
     PIIX4PMState *s = PIIX4_PM(adev);

     acpi_memory_ospm_status(&s->acpi_memory_hotplug, list);
     if (!s->cpu_hotplug_legacy) {
         acpi_cpu_ospm_status(&s->cpuhp_state, list);
     }
 }

 static void piix4_send_gpe(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
 {
     PIIX4PMState *s = PIIX4_PM(adev);

     acpi_send_gpe_event(&s->ar, s->irq, ev);
 }

 static Property piix4_pm_properties[] = {
     DEFINE_PROP_UINT32("smb_io_base", PIIX4PMState, smb_io_base, 0),
     DEFINE_PROP_UINT8(ACPI_PM_PROP_S3_DISABLED, PIIX4PMState, disable_s3, 0),
     DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_DISABLED, PIIX4PMState, disable_s4, 0),
     DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_VAL, PIIX4PMState, s4_val, 2),
     DEFINE_PROP_BOOL("acpi-pci-hotplug-with-bridge-support", PIIX4PMState,
                      use_acpi_pci_hotplug, true),
     DEFINE_PROP_BOOL("memory-hotplug-support", PIIX4PMState,
                      acpi_memory_hotplug.is_enabled, true),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void piix4_pm_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
     AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_CLASS(klass);

     k->realize = piix4_pm_realize;
     k->config_write = pm_write_config;
     k->vendor_id = PCI_VENDOR_ID_INTEL;
     k->device_id = PCI_DEVICE_ID_INTEL_82371AB_3;
     k->revision = 0x03;
     k->class_id = PCI_CLASS_BRIDGE_OTHER;
     dc->desc = "PM";
     dc->vmsd = &vmstate_acpi;
     dc->props = piix4_pm_properties;
     /*
      * Reason: part of PIIX4 southbridge, needs to be wired up,
      * e.g. by mips_malta_init()
      */
     dc->user_creatable = false;
     dc->hotpluggable = false;
     hc->pre_plug = piix4_device_pre_plug_cb;
     hc->plug = piix4_device_plug_cb;
     hc->unplug_request = piix4_device_unplug_request_cb;
     hc->unplug = piix4_device_unplug_cb;
     adevc->ospm_status = piix4_ospm_status;
     adevc->send_event = piix4_send_gpe;
     adevc->madt_cpu = pc_madt_cpu_entry;
 }

 static const TypeInfo piix4_pm_info = {
     .name          = TYPE_PIIX4_PM,
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(PIIX4PMState),
     .class_init    = piix4_pm_class_init,
     .interfaces = (InterfaceInfo[]) {
         { TYPE_HOTPLUG_HANDLER },
         { TYPE_ACPI_DEVICE_IF },
         { INTERFACE_CONVENTIONAL_PCI_DEVICE },
         { }
     }
 };

 static void piix4_pm_register_types(void)
 {
     type_register_static(&piix4_pm_info);
 }

 type_init(piix4_pm_register_types)
	/*
	* ACPI implementation
	*
	* Copyright (c) 2006 Fabrice Bellard
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser General Public
	* License version 2 as published by the Free Software Foundation.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library; if not, see <http://www.gnu.org/licenses/>
	*
	* Contributions after 2012-01-13 are licensed under the terms of the
	* GNU GPL, version 2 or (at your option) any later version.
	*/

	#include "qemu/osdep.h"
	#include "hw/i386/pc.h"
	#include "hw/irq.h"
	#include "hw/isa/apm.h"
	#include "hw/i2c/pm_smbus.h"
	#include "hw/pci/pci.h"
	#include "hw/qdev-properties.h"
	#include "hw/acpi/acpi.h"
	#include "sysemu/reset.h"
	#include "sysemu/runstate.h"
	#include "sysemu/sysemu.h"
	#include "qapi/error.h"
	#include "qemu/range.h"
	#include "exec/address-spaces.h"
	#include "hw/acpi/piix4.h"
	#include "hw/acpi/pcihp.h"
	#include "hw/acpi/cpu_hotplug.h"
	#include "hw/acpi/cpu.h"
	#include "hw/hotplug.h"
	#include "hw/mem/pc-dimm.h"
	#include "hw/acpi/memory_hotplug.h"
	#include "hw/acpi/acpi_dev_interface.h"
	#include "hw/xen/xen.h"
	#include "migration/qemu-file-types.h"
	#include "migration/vmstate.h"
	#include "hw/core/cpu.h"
	#include "trace.h"

	#define GPE_BASE 0xafe0
	#define GPE_LEN 4

	struct pci_status {
	uint32_t up; /* deprecated, maintained for migration compatibility */
	uint32_t down;
	};

	typedef struct PIIX4PMState {
	/< private >/
	PCIDevice parent_obj;
	/< public >/

	MemoryRegion io;
	uint32_t io_base;

	MemoryRegion io_gpe;
	ACPIREGS ar;

	APMState apm;

	PMSMBus smb;
	uint32_t smb_io_base;

	qemu_irq irq;
	qemu_irq smi_irq;
	int smm_enabled;
	Notifier machine_ready;
	Notifier powerdown_notifier;

	AcpiPciHpState acpi_pci_hotplug;
	bool use_acpi_pci_hotplug;

	uint8_t disable_s3;
	uint8_t disable_s4;
	uint8_t s4_val;

	bool cpu_hotplug_legacy;
	AcpiCpuHotplug gpe_cpu;
	CPUHotplugState cpuhp_state;

	MemHotplugState acpi_memory_hotplug;
	} PIIX4PMState;

	#define PIIX4_PM(obj) \
	OBJECT_CHECK(PIIX4PMState, (obj), TYPE_PIIX4_PM)

	static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
	PCIBus bus, PIIX4PMState s);

	#define ACPI_ENABLE 0xf1
	#define ACPI_DISABLE 0xf0

	static void pm_tmr_timer(ACPIREGS *ar)
	{
	PIIX4PMState *s = container_of(ar, PIIX4PMState, ar);
	acpi_update_sci(&s->ar, s->irq);
	}

	static void apm_ctrl_changed(uint32_t val, void *arg)
	{
	PIIX4PMState *s = arg;
	PCIDevice *d = PCI_DEVICE(s);

	/* ACPI specs 3.0, 4.7.2.5 */
	acpi_pm1_cnt_update(&s->ar, val == ACPI_ENABLE, val == ACPI_DISABLE);
	if (val == ACPI_ENABLE \|\| val == ACPI_DISABLE) {
	return;
	}

	if (d->config[0x5b] & (1 << 1)) {
	if (s->smi_irq) {
	qemu_irq_raise(s->smi_irq);
	}
	}
	}

	static void pm_io_space_update(PIIX4PMState *s)
	{
	PCIDevice *d = PCI_DEVICE(s);

	s->io_base = le32_to_cpu((uint32_t )(d->config + 0x40));
	s->io_base &= 0xffc0;

	memory_region_transaction_begin();
	memory_region_set_enabled(&s->io, d->config[0x80] & 1);
	memory_region_set_address(&s->io, s->io_base);
	memory_region_transaction_commit();
	}

	static void smbus_io_space_update(PIIX4PMState *s)
	{
	PCIDevice *d = PCI_DEVICE(s);

	s->smb_io_base = le32_to_cpu((uint32_t )(d->config + 0x90));
	s->smb_io_base &= 0xffc0;

	memory_region_transaction_begin();
	memory_region_set_enabled(&s->smb.io, d->config[0xd2] & 1);
	memory_region_set_address(&s->smb.io, s->smb_io_base);
	memory_region_transaction_commit();
	}

	static void pm_write_config(PCIDevice *d,
	uint32_t address, uint32_t val, int len)
	{
	pci_default_write_config(d, address, val, len);
	if (range_covers_byte(address, len, 0x80) \|\|
	ranges_overlap(address, len, 0x40, 4)) {
	pm_io_space_update((PIIX4PMState *)d);
	}
	if (range_covers_byte(address, len, 0xd2) \|\|
	ranges_overlap(address, len, 0x90, 4)) {
	smbus_io_space_update((PIIX4PMState *)d);
	}
	}

	static int vmstate_acpi_post_load(void *opaque, int version_id)
	{
	PIIX4PMState *s = opaque;

	pm_io_space_update(s);
	smbus_io_space_update(s);
	return 0;
	}

	#define VMSTATE_GPE_ARRAY(_field, _state) \
	{ \
	.name = (stringify(_field)), \
	.version_id = 0, \
	.info = &vmstate_info_uint16, \
	.size = sizeof(uint16_t), \
	.flags = VMS_SINGLE \| VMS_POINTER, \
	.offset = vmstate_offset_pointer(_state, _field, uint8_t), \
	}

	static const VMStateDescription vmstate_gpe = {
	.name = "gpe",
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (VMStateField[]) {
	VMSTATE_GPE_ARRAY(sts, ACPIGPE),
	VMSTATE_GPE_ARRAY(en, ACPIGPE),
	VMSTATE_END_OF_LIST()
	}
	};

	static const VMStateDescription vmstate_pci_status = {
	.name = "pci_status",
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (VMStateField[]) {
	VMSTATE_UINT32(up, struct AcpiPciHpPciStatus),
	VMSTATE_UINT32(down, struct AcpiPciHpPciStatus),
	VMSTATE_END_OF_LIST()
	}
	};

	static int acpi_load_old(QEMUFile f, void opaque, int version_id)
	{
	PIIX4PMState *s = opaque;
	int ret, i;
	uint16_t temp;

	ret = pci_device_load(PCI_DEVICE(s), f);
	if (ret < 0) {
	return ret;
	}
	qemu_get_be16s(f, &s->ar.pm1.evt.sts);
	qemu_get_be16s(f, &s->ar.pm1.evt.en);
	qemu_get_be16s(f, &s->ar.pm1.cnt.cnt);

	ret = vmstate_load_state(f, &vmstate_apm, &s->apm, 1);
	if (ret) {
	return ret;
	}

	timer_get(f, s->ar.tmr.timer);
	qemu_get_sbe64s(f, &s->ar.tmr.overflow_time);

	qemu_get_be16s(f, (uint16_t *)s->ar.gpe.sts);
	for (i = 0; i < 3; i++) {
	qemu_get_be16s(f, &temp);
	}

	qemu_get_be16s(f, (uint16_t *)s->ar.gpe.en);
	for (i = 0; i < 3; i++) {
	qemu_get_be16s(f, &temp);
	}

	ret = vmstate_load_state(f, &vmstate_pci_status,
	&s->acpi_pci_hotplug.acpi_pcihp_pci_status[ACPI_PCIHP_BSEL_DEFAULT], 1);
	return ret;
	}

	static bool vmstate_test_use_acpi_pci_hotplug(void *opaque, int version_id)
	{
	PIIX4PMState *s = opaque;
	return s->use_acpi_pci_hotplug;
	}

	static bool vmstate_test_no_use_acpi_pci_hotplug(void *opaque, int version_id)
	{
	PIIX4PMState *s = opaque;
	return !s->use_acpi_pci_hotplug;
	}

	static bool vmstate_test_use_memhp(void *opaque)
	{
	PIIX4PMState *s = opaque;
	return s->acpi_memory_hotplug.is_enabled;
	}

	static const VMStateDescription vmstate_memhp_state = {
	.name = "piix4_pm/memhp",
	.version_id = 1,
	.minimum_version_id = 1,
	.minimum_version_id_old = 1,
	.needed = vmstate_test_use_memhp,
	.fields = (VMStateField[]) {
	VMSTATE_MEMORY_HOTPLUG(acpi_memory_hotplug, PIIX4PMState),
	VMSTATE_END_OF_LIST()
	}
	};

	static bool vmstate_test_use_cpuhp(void *opaque)
	{
	PIIX4PMState *s = opaque;
	return !s->cpu_hotplug_legacy;
	}

	static int vmstate_cpuhp_pre_load(void *opaque)
	{
	Object *obj = OBJECT(opaque);
	object_property_set_bool(obj, false, "cpu-hotplug-legacy", &error_abort);
	return 0;
	}

	static const VMStateDescription vmstate_cpuhp_state = {
	.name = "piix4_pm/cpuhp",
	.version_id = 1,
	.minimum_version_id = 1,
	.minimum_version_id_old = 1,
	.needed = vmstate_test_use_cpuhp,
	.pre_load = vmstate_cpuhp_pre_load,
	.fields = (VMStateField[]) {
	VMSTATE_CPU_HOTPLUG(cpuhp_state, PIIX4PMState),
	VMSTATE_END_OF_LIST()
	}
	};

	static bool piix4_vmstate_need_smbus(void *opaque, int version_id)
	{
	return pm_smbus_vmstate_needed();
	}

	/* qemu-kvm 1.2 uses version 3 but advertised as 2
	* To support incoming qemu-kvm 1.2 migration, change version_id
	* and minimum_version_id to 2 below (which breaks migration from
	* qemu 1.2).
	*
	*/
	static const VMStateDescription vmstate_acpi = {
	.name = "piix4_pm",
	.version_id = 3,
	.minimum_version_id = 3,
	.minimum_version_id_old = 1,
	.load_state_old = acpi_load_old,
	.post_load = vmstate_acpi_post_load,
	.fields = (VMStateField[]) {
	VMSTATE_PCI_DEVICE(parent_obj, PIIX4PMState),
	VMSTATE_UINT16(ar.pm1.evt.sts, PIIX4PMState),
	VMSTATE_UINT16(ar.pm1.evt.en, PIIX4PMState),
	VMSTATE_UINT16(ar.pm1.cnt.cnt, PIIX4PMState),
	VMSTATE_STRUCT(apm, PIIX4PMState, 0, vmstate_apm, APMState),
	VMSTATE_STRUCT_TEST(smb, PIIX4PMState, piix4_vmstate_need_smbus, 3,
	pmsmb_vmstate, PMSMBus),
	VMSTATE_TIMER_PTR(ar.tmr.timer, PIIX4PMState),
	VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState),
	VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE),
	VMSTATE_STRUCT_TEST(
	acpi_pci_hotplug.acpi_pcihp_pci_status[ACPI_PCIHP_BSEL_DEFAULT],
	PIIX4PMState,
	vmstate_test_no_use_acpi_pci_hotplug,
	2, vmstate_pci_status,
	struct AcpiPciHpPciStatus),
	VMSTATE_PCI_HOTPLUG(acpi_pci_hotplug, PIIX4PMState,
	vmstate_test_use_acpi_pci_hotplug),
	VMSTATE_END_OF_LIST()
	},
	.subsections = (const VMStateDescription*[]) {
	&vmstate_memhp_state,
	&vmstate_cpuhp_state,
	NULL
	}
	};

	static void piix4_reset(void *opaque)
	{
	PIIX4PMState *s = opaque;
	PCIDevice *d = PCI_DEVICE(s);
	uint8_t *pci_conf = d->config;

	pci_conf[0x58] = 0;
	pci_conf[0x59] = 0;
	pci_conf[0x5a] = 0;
	pci_conf[0x5b] = 0;

	pci_conf[0x40] = 0x01; /* PM io base read only bit */
	pci_conf[0x80] = 0;

	if (!s->smm_enabled) {
	/* Mark SMM as already inited (until KVM supports SMM). */
	pci_conf[0x5B] = 0x02;
	}
	pm_io_space_update(s);
	acpi_pcihp_reset(&s->acpi_pci_hotplug);
	}

	static void piix4_pm_powerdown_req(Notifier n, void opaque)
	{
	PIIX4PMState *s = container_of(n, PIIX4PMState, powerdown_notifier);

	assert(s != NULL);
	acpi_pm1_evt_power_down(&s->ar);
	}

	static void piix4_device_pre_plug_cb(HotplugHandler *hotplug_dev,
	DeviceState dev, Error *errp)
	{
	PIIX4PMState *s = PIIX4_PM(hotplug_dev);

	if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
	acpi_pcihp_device_pre_plug_cb(hotplug_dev, dev, errp);
	} else if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
	if (!s->acpi_memory_hotplug.is_enabled) {
	error_setg(errp,
	"memory hotplug is not enabled: %s.memory-hotplug-support "
	"is not set", object_get_typename(OBJECT(s)));
	}
	} else if (
	!object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
	error_setg(errp, "acpi: device pre plug request for not supported"
	" device type: %s", object_get_typename(OBJECT(dev)));
	}
	}

	static void piix4_device_plug_cb(HotplugHandler *hotplug_dev,
	DeviceState dev, Error *errp)
	{
	PIIX4PMState *s = PIIX4_PM(hotplug_dev);

	if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
	if (object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM)) {
	nvdimm_acpi_plug_cb(hotplug_dev, dev);
	} else {
	acpi_memory_plug_cb(hotplug_dev, &s->acpi_memory_hotplug,
	dev, errp);
	}
	} else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
	acpi_pcihp_device_plug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev, errp);
	} else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
	if (s->cpu_hotplug_legacy) {
	legacy_acpi_cpu_plug_cb(hotplug_dev, &s->gpe_cpu, dev, errp);
	} else {
	acpi_cpu_plug_cb(hotplug_dev, &s->cpuhp_state, dev, errp);
	}
	} else {
	g_assert_not_reached();
	}
	}

	static void piix4_device_unplug_request_cb(HotplugHandler *hotplug_dev,
	DeviceState dev, Error *errp)
	{
	PIIX4PMState *s = PIIX4_PM(hotplug_dev);

	if (s->acpi_memory_hotplug.is_enabled &&
	object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
	acpi_memory_unplug_request_cb(hotplug_dev, &s->acpi_memory_hotplug,
	dev, errp);
	} else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
	acpi_pcihp_device_unplug_request_cb(hotplug_dev, &s->acpi_pci_hotplug,
	dev, errp);
	} else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
	!s->cpu_hotplug_legacy) {
	acpi_cpu_unplug_request_cb(hotplug_dev, &s->cpuhp_state, dev, errp);
	} else {
	error_setg(errp, "acpi: device unplug request for not supported device"
	" type: %s", object_get_typename(OBJECT(dev)));
	}
	}

	static void piix4_device_unplug_cb(HotplugHandler *hotplug_dev,
	DeviceState dev, Error *errp)
	{
	PIIX4PMState *s = PIIX4_PM(hotplug_dev);

	if (s->acpi_memory_hotplug.is_enabled &&
	object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
	acpi_memory_unplug_cb(&s->acpi_memory_hotplug, dev, errp);
	} else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
	acpi_pcihp_device_unplug_cb(hotplug_dev, &s->acpi_pci_hotplug, dev,
	errp);
	} else if (object_dynamic_cast(OBJECT(dev), TYPE_CPU) &&
	!s->cpu_hotplug_legacy) {
	acpi_cpu_unplug_cb(&s->cpuhp_state, dev, errp);
	} else {
	error_setg(errp, "acpi: device unplug for not supported device"
	" type: %s", object_get_typename(OBJECT(dev)));
	}
	}

	static void piix4_pm_machine_ready(Notifier n, void opaque)
	{
	PIIX4PMState *s = container_of(n, PIIX4PMState, machine_ready);
	PCIDevice *d = PCI_DEVICE(s);
	MemoryRegion *io_as = pci_address_space_io(d);
	uint8_t *pci_conf;

	pci_conf = d->config;
	pci_conf[0x5f] = 0x10 \|
	(memory_region_present(io_as, 0x378) ? 0x80 : 0);
	pci_conf[0x63] = 0x60;
	pci_conf[0x67] = (memory_region_present(io_as, 0x3f8) ? 0x08 : 0) \|
	(memory_region_present(io_as, 0x2f8) ? 0x90 : 0);
	}

	static void piix4_pm_add_propeties(PIIX4PMState *s)
	{
	static const uint8_t acpi_enable_cmd = ACPI_ENABLE;
	static const uint8_t acpi_disable_cmd = ACPI_DISABLE;
	static const uint32_t gpe0_blk = GPE_BASE;
	static const uint32_t gpe0_blk_len = GPE_LEN;
	static const uint16_t sci_int = 9;

	object_property_add_uint8_ptr(OBJECT(s), ACPI_PM_PROP_ACPI_ENABLE_CMD,
	&acpi_enable_cmd, NULL);
	object_property_add_uint8_ptr(OBJECT(s), ACPI_PM_PROP_ACPI_DISABLE_CMD,
	&acpi_disable_cmd, NULL);
	object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_GPE0_BLK,
	&gpe0_blk, NULL);
	object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_GPE0_BLK_LEN,
	&gpe0_blk_len, NULL);
	object_property_add_uint16_ptr(OBJECT(s), ACPI_PM_PROP_SCI_INT,
	&sci_int, NULL);
	object_property_add_uint32_ptr(OBJECT(s), ACPI_PM_PROP_PM_IO_BASE,
	&s->io_base, NULL);
	}

	static void piix4_pm_realize(PCIDevice dev, Error *errp)
	{
	PIIX4PMState *s = PIIX4_PM(dev);
	uint8_t *pci_conf;

	pci_conf = dev->config;
	pci_conf[0x06] = 0x80;
	pci_conf[0x07] = 0x02;
	pci_conf[0x09] = 0x00;
	pci_conf[0x3d] = 0x01; // interrupt pin 1

	/* APM */
	apm_init(dev, &s->apm, apm_ctrl_changed, s);

	if (!s->smm_enabled) {
	/* Mark SMM as already inited to prevent SMM from running. KVM does not
	* support SMM mode. */
	pci_conf[0x5B] = 0x02;
	}

	/* XXX: which specification is used ? The i82731AB has different
	mappings */
	pci_conf[0x90] = s->smb_io_base \| 1;
	pci_conf[0x91] = s->smb_io_base >> 8;
	pci_conf[0xd2] = 0x09;
	pm_smbus_init(DEVICE(dev), &s->smb, true);
	memory_region_set_enabled(&s->smb.io, pci_conf[0xd2] & 1);
	memory_region_add_subregion(pci_address_space_io(dev),
	s->smb_io_base, &s->smb.io);

	memory_region_init(&s->io, OBJECT(s), "piix4-pm", 64);
	memory_region_set_enabled(&s->io, false);
	memory_region_add_subregion(pci_address_space_io(dev),
	0, &s->io);

	acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io);
	acpi_pm1_evt_init(&s->ar, pm_tmr_timer, &s->io);
	acpi_pm1_cnt_init(&s->ar, &s->io, s->disable_s3, s->disable_s4, s->s4_val);
	acpi_gpe_init(&s->ar, GPE_LEN);

	s->powerdown_notifier.notify = piix4_pm_powerdown_req;
	qemu_register_powerdown_notifier(&s->powerdown_notifier);

	s->machine_ready.notify = piix4_pm_machine_ready;
	qemu_add_machine_init_done_notifier(&s->machine_ready);
	qemu_register_reset(piix4_reset, s);

	piix4_acpi_system_hot_add_init(pci_address_space_io(dev),
	pci_get_bus(dev), s);
	qbus_set_hotplug_handler(BUS(pci_get_bus(dev)), OBJECT(s), &error_abort);

	piix4_pm_add_propeties(s);
	}

	I2CBus piix4_pm_init(PCIBus bus, int devfn, uint32_t smb_io_base,
	qemu_irq sci_irq, qemu_irq smi_irq,
	int smm_enabled, DeviceState **piix4_pm)
	{
	DeviceState *dev;
	PIIX4PMState *s;

	dev = DEVICE(pci_create(bus, devfn, TYPE_PIIX4_PM));
	qdev_prop_set_uint32(dev, "smb_io_base", smb_io_base);
	if (piix4_pm) {
	*piix4_pm = dev;
	}

	s = PIIX4_PM(dev);
	s->irq = sci_irq;
	s->smi_irq = smi_irq;
	s->smm_enabled = smm_enabled;
	if (xen_enabled()) {
	s->use_acpi_pci_hotplug = false;
	}

	qdev_init_nofail(dev);

	return s->smb.smbus;
	}

	static uint64_t gpe_readb(void *opaque, hwaddr addr, unsigned width)
	{
	PIIX4PMState *s = opaque;
	uint32_t val = acpi_gpe_ioport_readb(&s->ar, addr);

	trace_piix4_gpe_readb(addr, width, val);
	return val;
	}

	static void gpe_writeb(void *opaque, hwaddr addr, uint64_t val,
	unsigned width)
	{
	PIIX4PMState *s = opaque;

	trace_piix4_gpe_writeb(addr, width, val);
	acpi_gpe_ioport_writeb(&s->ar, addr, val);
	acpi_update_sci(&s->ar, s->irq);
	}

	static const MemoryRegionOps piix4_gpe_ops = {
	.read = gpe_readb,
	.write = gpe_writeb,
	.valid.min_access_size = 1,
	.valid.max_access_size = 4,
	.impl.min_access_size = 1,
	.impl.max_access_size = 1,
	.endianness = DEVICE_LITTLE_ENDIAN,
	};


	static bool piix4_get_cpu_hotplug_legacy(Object obj, Error *errp)
	{
	PIIX4PMState *s = PIIX4_PM(obj);

	return s->cpu_hotplug_legacy;
	}

	static void piix4_set_cpu_hotplug_legacy(Object obj, bool value, Error *errp)
	{
	PIIX4PMState *s = PIIX4_PM(obj);

	assert(!value);
	if (s->cpu_hotplug_legacy && value == false) {
	acpi_switch_to_modern_cphp(&s->gpe_cpu, &s->cpuhp_state,
	PIIX4_CPU_HOTPLUG_IO_BASE);
	}
	s->cpu_hotplug_legacy = value;
	}

	static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
	PCIBus bus, PIIX4PMState s)
	{
	memory_region_init_io(&s->io_gpe, OBJECT(s), &piix4_gpe_ops, s,
	"acpi-gpe0", GPE_LEN);
	memory_region_add_subregion(parent, GPE_BASE, &s->io_gpe);

	acpi_pcihp_init(OBJECT(s), &s->acpi_pci_hotplug, bus, parent,
	s->use_acpi_pci_hotplug);

	s->cpu_hotplug_legacy = true;
	object_property_add_bool(OBJECT(s), "cpu-hotplug-legacy",
	piix4_get_cpu_hotplug_legacy,
	piix4_set_cpu_hotplug_legacy,
	NULL);
	legacy_acpi_cpu_hotplug_init(parent, OBJECT(s), &s->gpe_cpu,
	PIIX4_CPU_HOTPLUG_IO_BASE);

	if (s->acpi_memory_hotplug.is_enabled) {
	acpi_memory_hotplug_init(parent, OBJECT(s), &s->acpi_memory_hotplug,
	ACPI_MEMORY_HOTPLUG_BASE);
	}
	}

	static void piix4_ospm_status(AcpiDeviceIf adev, ACPIOSTInfoList **list)
	{
	PIIX4PMState *s = PIIX4_PM(adev);

	acpi_memory_ospm_status(&s->acpi_memory_hotplug, list);
	if (!s->cpu_hotplug_legacy) {
	acpi_cpu_ospm_status(&s->cpuhp_state, list);
	}
	}

	static void piix4_send_gpe(AcpiDeviceIf *adev, AcpiEventStatusBits ev)
	{
	PIIX4PMState *s = PIIX4_PM(adev);

	acpi_send_gpe_event(&s->ar, s->irq, ev);
	}

	static Property piix4_pm_properties[] = {
	DEFINE_PROP_UINT32("smb_io_base", PIIX4PMState, smb_io_base, 0),
	DEFINE_PROP_UINT8(ACPI_PM_PROP_S3_DISABLED, PIIX4PMState, disable_s3, 0),
	DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_DISABLED, PIIX4PMState, disable_s4, 0),
	DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_VAL, PIIX4PMState, s4_val, 2),
	DEFINE_PROP_BOOL("acpi-pci-hotplug-with-bridge-support", PIIX4PMState,
	use_acpi_pci_hotplug, true),
	DEFINE_PROP_BOOL("memory-hotplug-support", PIIX4PMState,
	acpi_memory_hotplug.is_enabled, true),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void piix4_pm_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
	HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
	AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_CLASS(klass);

	k->realize = piix4_pm_realize;
	k->config_write = pm_write_config;
	k->vendor_id = PCI_VENDOR_ID_INTEL;
	k->device_id = PCI_DEVICE_ID_INTEL_82371AB_3;
	k->revision = 0x03;
	k->class_id = PCI_CLASS_BRIDGE_OTHER;
	dc->desc = "PM";
	dc->vmsd = &vmstate_acpi;
	dc->props = piix4_pm_properties;
	/*
	* Reason: part of PIIX4 southbridge, needs to be wired up,
	* e.g. by mips_malta_init()
	*/
	dc->user_creatable = false;
	dc->hotpluggable = false;
	hc->pre_plug = piix4_device_pre_plug_cb;
	hc->plug = piix4_device_plug_cb;
	hc->unplug_request = piix4_device_unplug_request_cb;
	hc->unplug = piix4_device_unplug_cb;
	adevc->ospm_status = piix4_ospm_status;
	adevc->send_event = piix4_send_gpe;
	adevc->madt_cpu = pc_madt_cpu_entry;
	}

	static const TypeInfo piix4_pm_info = {
	.name = TYPE_PIIX4_PM,
	.parent = TYPE_PCI_DEVICE,
	.instance_size = sizeof(PIIX4PMState),
	.class_init = piix4_pm_class_init,
	.interfaces = (InterfaceInfo[]) {
	{ TYPE_HOTPLUG_HANDLER },
	{ TYPE_ACPI_DEVICE_IF },
	{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
	{ }
	}
	};

	static void piix4_pm_register_types(void)
	{
	type_register_static(&piix4_pm_info);
	}

	type_init(piix4_pm_register_types)