Archipelago » qemu

/*

 *  APIC support - common bits of emulated and KVM kernel model

 *

 *  Copyright (c) 2004-2005 Fabrice Bellard

 *  Copyright (c) 2011      Jan Kiszka, Siemens AG

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * 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/>

 */

#include "apic.h"

#include "apic_internal.h"

#include "trace.h"

static int apic_irq_delivered;

void cpu_set_apic_base(DeviceState *d, uint64_t val)

{

    trace_cpu_set_apic_base(val);

    if (d) {

        APICCommonState *s = APIC_COMMON(d);

        APICCommonClass *info = APIC_COMMON_GET_CLASS(s);

        info->set_base(s, val);

    }

}

uint64_t cpu_get_apic_base(DeviceState *d)

{

    if (d) {

        APICCommonState *s = APIC_COMMON(d);

        trace_cpu_get_apic_base((uint64_t)s->apicbase);

        return s->apicbase;

    } else {

        trace_cpu_get_apic_base(0);

        return 0;

    }

}

void cpu_set_apic_tpr(DeviceState *d, uint8_t val)

{

    APICCommonState *s;

    APICCommonClass *info;

    if (!d) {

        return;

    }

    s = APIC_COMMON(d);

    info = APIC_COMMON_GET_CLASS(s);

    info->set_tpr(s, val);

}

uint8_t cpu_get_apic_tpr(DeviceState *d)

{

    APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);

    return s ? s->tpr >> 4 : 0;

}

void apic_report_irq_delivered(int delivered)

{

    apic_irq_delivered += delivered;

    trace_apic_report_irq_delivered(apic_irq_delivered);

}

void apic_reset_irq_delivered(void)

{

    trace_apic_reset_irq_delivered(apic_irq_delivered);

    apic_irq_delivered = 0;

}

int apic_get_irq_delivered(void)

{

    trace_apic_get_irq_delivered(apic_irq_delivered);

    return apic_irq_delivered;

}

void apic_deliver_nmi(DeviceState *d)

{

    APICCommonState *s = APIC_COMMON(d);

    APICCommonClass *info = APIC_COMMON_GET_CLASS(s);

    info->external_nmi(s);

}

bool apic_next_timer(APICCommonState *s, int64_t current_time)

{

    int64_t d;

    /* We need to store the timer state separately to support APIC

     * implementations that maintain a non-QEMU timer, e.g. inside the

     * host kernel. This open-coded state allows us to migrate between

     * both models. */

    s->timer_expiry = -1;

    if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_MASKED) {

        return false;

    }

    d = (current_time - s->initial_count_load_time) >> s->count_shift;

    if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {

        if (!s->initial_count) {

            return false;

        }

        d = ((d / ((uint64_t)s->initial_count + 1)) + 1) *

            ((uint64_t)s->initial_count + 1);

    } else {

        if (d >= s->initial_count) {

            return false;

        }

        d = (uint64_t)s->initial_count + 1;

    }

    s->next_time = s->initial_count_load_time + (d << s->count_shift);

    s->timer_expiry = s->next_time;

    return true;

}

void apic_init_reset(DeviceState *d)

{

    APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);

    int i;

    if (!s) {

        return;

    }

    s->tpr = 0;

    s->spurious_vec = 0xff;

    s->log_dest = 0;

    s->dest_mode = 0xf;

    memset(s->isr, 0, sizeof(s->isr));

    memset(s->tmr, 0, sizeof(s->tmr));

    memset(s->irr, 0, sizeof(s->irr));

    for (i = 0; i < APIC_LVT_NB; i++) {

        s->lvt[i] = APIC_LVT_MASKED;

    }

    s->esr = 0;

    memset(s->icr, 0, sizeof(s->icr));

    s->divide_conf = 0;

    s->count_shift = 0;

    s->initial_count = 0;

    s->initial_count_load_time = 0;

    s->next_time = 0;

    s->wait_for_sipi = 1;

    if (s->timer) {

        qemu_del_timer(s->timer);

    }

    s->timer_expiry = -1;

}

static void apic_reset_common(DeviceState *d)

{

    APICCommonState *s = DO_UPCAST(APICCommonState, busdev.qdev, d);

    bool bsp;

    bsp = cpu_is_bsp(s->cpu_env);

    s->apicbase = 0xfee00000 |

        (bsp ? MSR_IA32_APICBASE_BSP : 0) | MSR_IA32_APICBASE_ENABLE;

    apic_init_reset(d);

    if (bsp) {

        /*

         * LINT0 delivery mode on CPU #0 is set to ExtInt at initialization

         * time typically by BIOS, so PIC interrupt can be delivered to the

         * processor when local APIC is enabled.

         */

        s->lvt[APIC_LVT_LINT0] = 0x700;

    }

}

/* This function is only used for old state version 1 and 2 */

static int apic_load_old(QEMUFile *f, void *opaque, int version_id)

{

    APICCommonState *s = opaque;

    int i;

    if (version_id > 2) {

        return -EINVAL;

    }

    /* XXX: what if the base changes? (registered memory regions) */

    qemu_get_be32s(f, &s->apicbase);

    qemu_get_8s(f, &s->id);

    qemu_get_8s(f, &s->arb_id);

    qemu_get_8s(f, &s->tpr);

    qemu_get_be32s(f, &s->spurious_vec);

    qemu_get_8s(f, &s->log_dest);

    qemu_get_8s(f, &s->dest_mode);

    for (i = 0; i < 8; i++) {

        qemu_get_be32s(f, &s->isr[i]);

        qemu_get_be32s(f, &s->tmr[i]);

        qemu_get_be32s(f, &s->irr[i]);

    }

    for (i = 0; i < APIC_LVT_NB; i++) {

        qemu_get_be32s(f, &s->lvt[i]);

    }

    qemu_get_be32s(f, &s->esr);

    qemu_get_be32s(f, &s->icr[0]);

    qemu_get_be32s(f, &s->icr[1]);

    qemu_get_be32s(f, &s->divide_conf);

    s->count_shift = qemu_get_be32(f);

    qemu_get_be32s(f, &s->initial_count);

    s->initial_count_load_time = qemu_get_be64(f);

    s->next_time = qemu_get_be64(f);

    if (version_id >= 2) {

        qemu_get_timer(f, s->timer);

    }

    return 0;

}

static int apic_init_common(SysBusDevice *dev)

{

    APICCommonState *s = APIC_COMMON(dev);

    APICCommonClass *info;

    static int apic_no;

    if (apic_no >= MAX_APICS) {

        return -1;

    }

    s->idx = apic_no++;

    info = APIC_COMMON_GET_CLASS(s);

    info->init(s);

    sysbus_init_mmio(&s->busdev, &s->io_memory);

    return 0;

}

static int apic_dispatch_post_load(void *opaque, int version_id)

{

    APICCommonState *s = APIC_COMMON(opaque);

    APICCommonClass *info = APIC_COMMON_GET_CLASS(s);

    if (info->post_load) {

        info->post_load(s);

    }

    return 0;

}

static const VMStateDescription vmstate_apic_common = {

    .name = "apic",

    .version_id = 3,

    .minimum_version_id = 3,

    .minimum_version_id_old = 1,

    .load_state_old = apic_load_old,

    .post_load = apic_dispatch_post_load,

    .fields = (VMStateField[]) {

        VMSTATE_UINT32(apicbase, APICCommonState),

        VMSTATE_UINT8(id, APICCommonState),

        VMSTATE_UINT8(arb_id, APICCommonState),

        VMSTATE_UINT8(tpr, APICCommonState),

        VMSTATE_UINT32(spurious_vec, APICCommonState),

        VMSTATE_UINT8(log_dest, APICCommonState),

        VMSTATE_UINT8(dest_mode, APICCommonState),

        VMSTATE_UINT32_ARRAY(isr, APICCommonState, 8),

        VMSTATE_UINT32_ARRAY(tmr, APICCommonState, 8),

        VMSTATE_UINT32_ARRAY(irr, APICCommonState, 8),

        VMSTATE_UINT32_ARRAY(lvt, APICCommonState, APIC_LVT_NB),

        VMSTATE_UINT32(esr, APICCommonState),

        VMSTATE_UINT32_ARRAY(icr, APICCommonState, 2),

        VMSTATE_UINT32(divide_conf, APICCommonState),

        VMSTATE_INT32(count_shift, APICCommonState),

        VMSTATE_UINT32(initial_count, APICCommonState),

        VMSTATE_INT64(initial_count_load_time, APICCommonState),

        VMSTATE_INT64(next_time, APICCommonState),

        VMSTATE_INT64(timer_expiry,

                      APICCommonState), /* open-coded timer state */

        VMSTATE_END_OF_LIST()

    }

};

static Property apic_properties_common[] = {

    DEFINE_PROP_UINT8("id", APICCommonState, id, -1),

    DEFINE_PROP_PTR("cpu_env", APICCommonState, cpu_env),

    DEFINE_PROP_END_OF_LIST(),

};

static void apic_common_class_init(ObjectClass *klass, void *data)

{

    SysBusDeviceClass *sc = SYS_BUS_DEVICE_CLASS(klass);

    DeviceClass *dc = DEVICE_CLASS(klass);

    dc->vmsd = &vmstate_apic_common;

    dc->reset = apic_reset_common;

    dc->no_user = 1;

    dc->props = apic_properties_common;

    sc->init = apic_init_common;

}

static TypeInfo apic_common_type = {

    .name = TYPE_APIC_COMMON,

    .parent = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(APICCommonState),

    .class_size = sizeof(APICCommonClass),

    .class_init = apic_common_class_init,

    .abstract = true,

};

static void register_devices(void)

{

    type_register_static(&apic_common_type);

}

device_init(register_devices);