/*
 * QEMU CPU model (system specific)
 *
 * Copyright (c) 2012-2014 SUSE LINUX Products GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "exec/address-spaces.h"
#include "exec/cputlb.h"
#include "exec/memory.h"
#include "exec/tb-flush.h"
#include "exec/tswap.h"
#include "hw/qdev-core.h"
#include "hw/qdev-properties.h"
#include "hw/core/sysemu-cpu-ops.h"
#include "migration/vmstate.h"
#include "system/tcg.h"

bool cpu_has_work(CPUState *cpu)
{
    return cpu->cc->sysemu_ops->has_work(cpu);
}

bool cpu_paging_enabled(const CPUState *cpu)
{
    if (cpu->cc->sysemu_ops->get_paging_enabled) {
        return cpu->cc->sysemu_ops->get_paging_enabled(cpu);
    }

    return false;
}

bool cpu_get_memory_mapping(CPUState *cpu, MemoryMappingList *list,
                            Error **errp)
{
    if (cpu->cc->sysemu_ops->get_memory_mapping) {
        return cpu->cc->sysemu_ops->get_memory_mapping(cpu, list, errp);
    }

    error_setg(errp, "Obtaining memory mappings is unsupported on this CPU.");
    return false;
}

hwaddr cpu_get_phys_page_attrs_debug(CPUState *cpu, vaddr addr,
                                     MemTxAttrs *attrs)
{
    hwaddr paddr;

    if (cpu->cc->sysemu_ops->get_phys_page_attrs_debug) {
        paddr = cpu->cc->sysemu_ops->get_phys_page_attrs_debug(cpu, addr,
                                                               attrs);
    } else {
        /* Fallback for CPUs which don't implement the _attrs_ hook */
        *attrs = MEMTXATTRS_UNSPECIFIED;
        paddr = cpu->cc->sysemu_ops->get_phys_page_debug(cpu, addr);
    }
    /* Indicate that this is a debug access. */
    attrs->debug = 1;
    return paddr;
}

hwaddr cpu_get_phys_page_debug(CPUState *cpu, vaddr addr)
{
    MemTxAttrs attrs = {};

    return cpu_get_phys_page_attrs_debug(cpu, addr, &attrs);
}

int cpu_asidx_from_attrs(CPUState *cpu, MemTxAttrs attrs)
{
    int ret = 0;

    if (cpu->cc->sysemu_ops->asidx_from_attrs) {
        ret = cpu->cc->sysemu_ops->asidx_from_attrs(cpu, attrs);
        assert(ret < cpu->num_ases && ret >= 0);
    }
    return ret;
}

int cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
                             void *opaque)
{
    if (!cpu->cc->sysemu_ops->write_elf32_qemunote) {
        return 0;
    }
    return (*cpu->cc->sysemu_ops->write_elf32_qemunote)(f, cpu, opaque);
}

int cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cpu,
                         int cpuid, void *opaque)
{
    if (!cpu->cc->sysemu_ops->write_elf32_note) {
        return -1;
    }
    return (*cpu->cc->sysemu_ops->write_elf32_note)(f, cpu, cpuid, opaque);
}

int cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
                             void *opaque)
{
    if (!cpu->cc->sysemu_ops->write_elf64_qemunote) {
        return 0;
    }
    return (*cpu->cc->sysemu_ops->write_elf64_qemunote)(f, cpu, opaque);
}

int cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cpu,
                         int cpuid, void *opaque)
{
    if (!cpu->cc->sysemu_ops->write_elf64_note) {
        return -1;
    }
    return (*cpu->cc->sysemu_ops->write_elf64_note)(f, cpu, cpuid, opaque);
}

bool cpu_virtio_is_big_endian(CPUState *cpu)
{
    if (cpu->cc->sysemu_ops->virtio_is_big_endian) {
        return cpu->cc->sysemu_ops->virtio_is_big_endian(cpu);
    }
    return target_words_bigendian();
}

GuestPanicInformation *cpu_get_crash_info(CPUState *cpu)
{
    GuestPanicInformation *res = NULL;

    if (cpu->cc->sysemu_ops->get_crash_info) {
        res = cpu->cc->sysemu_ops->get_crash_info(cpu);
    }
    return res;
}

static const Property cpu_system_props[] = {
    /*
     * Create a memory property for system CPU object, so users can
     * wire up its memory.  The default if no link is set up is to use
     * the system address space.
     */
    DEFINE_PROP_LINK("memory", CPUState, memory, TYPE_MEMORY_REGION,
                     MemoryRegion *),
};

static bool cpu_get_start_powered_off(Object *obj, Error **errp)
{
    CPUState *cpu = CPU(obj);
    return cpu->start_powered_off;
}

static void cpu_set_start_powered_off(Object *obj, bool value, Error **errp)
{
    CPUState *cpu = CPU(obj);
    cpu->start_powered_off = value;
}

void cpu_class_init_props(DeviceClass *dc)
{
    ObjectClass *oc = OBJECT_CLASS(dc);

    /*
     * We can't use DEFINE_PROP_BOOL in the Property array for this
     * property, because we want this to be settable after realize.
     */
    object_class_property_add_bool(oc, "start-powered-off",
                                   cpu_get_start_powered_off,
                                   cpu_set_start_powered_off);

    device_class_set_props(dc, cpu_system_props);
}

void cpu_exec_class_post_init(CPUClass *cc)
{
    /* Check mandatory SysemuCPUOps handlers */
    g_assert(cc->sysemu_ops->has_work);
}

void cpu_exec_initfn(CPUState *cpu)
{
    cpu->memory = get_system_memory();
    object_ref(OBJECT(cpu->memory));
}

static int cpu_common_post_load(void *opaque, int version_id)
{
    if (tcg_enabled()) {
        CPUState *cpu = opaque;

        /*
         * 0x01 was CPU_INTERRUPT_EXIT. This line can be removed when the
         * version_id is increased.
         */
        cpu->interrupt_request &= ~0x01;

        tlb_flush(cpu);

        /*
         * loadvm has just updated the content of RAM, bypassing the
         * usual mechanisms that ensure we flush TBs for writes to
         * memory we've translated code from. So we must flush all TBs,
         * which will now be stale.
         */
        tb_flush(cpu);
    }

    return 0;
}

static int cpu_common_pre_load(void *opaque)
{
    CPUState *cpu = opaque;

    cpu->exception_index = -1;

    return 0;
}

static bool cpu_common_exception_index_needed(void *opaque)
{
    CPUState *cpu = opaque;

    return tcg_enabled() && cpu->exception_index != -1;
}

static const VMStateDescription vmstate_cpu_common_exception_index = {
    .name = "cpu_common/exception_index",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = cpu_common_exception_index_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_INT32(exception_index, CPUState),
        VMSTATE_END_OF_LIST()
    }
};

static bool cpu_common_crash_occurred_needed(void *opaque)
{
    CPUState *cpu = opaque;

    return cpu->crash_occurred;
}

static const VMStateDescription vmstate_cpu_common_crash_occurred = {
    .name = "cpu_common/crash_occurred",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = cpu_common_crash_occurred_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_BOOL(crash_occurred, CPUState),
        VMSTATE_END_OF_LIST()
    }
};

const VMStateDescription vmstate_cpu_common = {
    .name = "cpu_common",
    .version_id = 1,
    .minimum_version_id = 1,
    .pre_load = cpu_common_pre_load,
    .post_load = cpu_common_post_load,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT32(halted, CPUState),
        VMSTATE_UINT32(interrupt_request, CPUState),
        VMSTATE_END_OF_LIST()
    },
    .subsections = (const VMStateDescription * const []) {
        &vmstate_cpu_common_exception_index,
        &vmstate_cpu_common_crash_occurred,
        NULL
    }
};

void cpu_vmstate_register(CPUState *cpu)
{
    if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
        vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
    }
    if (cpu->cc->sysemu_ops->legacy_vmsd != NULL) {
        vmstate_register(NULL, cpu->cpu_index,
                         cpu->cc->sysemu_ops->legacy_vmsd, cpu);
    }
}

void cpu_vmstate_unregister(CPUState *cpu)
{
    if (cpu->cc->sysemu_ops->legacy_vmsd != NULL) {
        vmstate_unregister(NULL, cpu->cc->sysemu_ops->legacy_vmsd, cpu);
    }
    if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
        vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
    }
}