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/*

 * QEMU S/390 CPU

 *

 * Copyright (c) 2009 Ulrich Hecht

 * Copyright (c) 2011 Alexander Graf

 * Copyright (c) 2012 SUSE LINUX Products GmbH

 * Copyright (c) 2012 IBM Corp.

 *

 * 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 2.1 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/lgpl-2.1.html>

 * Contributions after 2012-12-11 are licensed under the terms of the

 * GNU GPL, version 2 or (at your option) any later version.

 */

#include "cpu.h"

#include "qemu-common.h"

#include "qemu/timer.h"

#include "hw/hw.h"

#ifndef CONFIG_USER_ONLY

#include "sysemu/arch_init.h"

#endif

#define CR0_RESET       0xE0UL

#define CR14_RESET      0xC2000000UL;

/* generate CPU information for cpu -? */

void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)

{

#ifdef CONFIG_KVM

    (*cpu_fprintf)(f, "s390 %16s\n", "host");

#endif

}

#ifndef CONFIG_USER_ONLY

CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)

{

    CpuDefinitionInfoList *entry;

    CpuDefinitionInfo *info;

    info = g_malloc0(sizeof(*info));

    info->name = g_strdup("host");

    entry = g_malloc0(sizeof(*entry));

    entry->value = info;

    return entry;

}

#endif

static void s390_cpu_set_pc(CPUState *cs, vaddr value)

{

    S390CPU *cpu = S390_CPU(cs);

    cpu->env.psw.addr = value;

}

/* CPUClass::reset() */

static void s390_cpu_reset(CPUState *s)

{

    S390CPU *cpu = S390_CPU(s);

    S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);

    CPUS390XState *env = &cpu->env;

    s390_del_running_cpu(cpu);

    scc->parent_reset(s);

    memset(env, 0, offsetof(CPUS390XState, breakpoints));

    /* architectured initial values for CR 0 and 14 */

    env->cregs[0] = CR0_RESET;

    env->cregs[14] = CR14_RESET;

    /* set halted to 1 to make sure we can add the cpu in

     * s390_ipl_cpu code, where CPUState::halted is set back to 0

     * after incrementing the cpu counter */

#if !defined(CONFIG_USER_ONLY)

    s->halted = 1;

#endif

    tlb_flush(env, 1);

}

#if !defined(CONFIG_USER_ONLY)

static void s390_cpu_machine_reset_cb(void *opaque)

{

    S390CPU *cpu = opaque;

    cpu_reset(CPU(cpu));

}

#endif

static void s390_cpu_realizefn(DeviceState *dev, Error **errp)

{

    S390CPU *cpu = S390_CPU(dev);

    S390CPUClass *scc = S390_CPU_GET_CLASS(dev);

    cpu_reset(CPU(cpu));

    scc->parent_realize(dev, errp);

}

static void s390_cpu_initfn(Object *obj)

{

    CPUState *cs = CPU(obj);

    S390CPU *cpu = S390_CPU(obj);

    CPUS390XState *env = &cpu->env;

    static bool inited;

    static int cpu_num = 0;

#if !defined(CONFIG_USER_ONLY)

    struct tm tm;

#endif

    cs->env_ptr = env;

    cpu_exec_init(env);

#if !defined(CONFIG_USER_ONLY)

    qemu_register_reset(s390_cpu_machine_reset_cb, cpu);

    qemu_get_timedate(&tm, 0);

    env->tod_offset = TOD_UNIX_EPOCH +

                      (time2tod(mktimegm(&tm)) * 1000000000ULL);

    env->tod_basetime = 0;

    env->tod_timer = qemu_new_timer_ns(vm_clock, s390x_tod_timer, cpu);

    env->cpu_timer = qemu_new_timer_ns(vm_clock, s390x_cpu_timer, cpu);

    /* set CPUState::halted state to 1 to avoid decrementing the running

     * cpu counter in s390_cpu_reset to a negative number at

     * initial ipl */

    cs->halted = 1;

#endif

    env->cpu_num = cpu_num++;

    env->ext_index = -1;

    if (tcg_enabled() && !inited) {

        inited = true;

        s390x_translate_init();

    }

}

static void s390_cpu_finalize(Object *obj)

{

#if !defined(CONFIG_USER_ONLY)

    S390CPU *cpu = S390_CPU(obj);

    qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);

#endif

}

static const VMStateDescription vmstate_s390_cpu = {

    .name = "cpu",

    .unmigratable = 1,

};

static void s390_cpu_class_init(ObjectClass *oc, void *data)

{

    S390CPUClass *scc = S390_CPU_CLASS(oc);

    CPUClass *cc = CPU_CLASS(scc);

    DeviceClass *dc = DEVICE_CLASS(oc);

    scc->parent_realize = dc->realize;

    dc->realize = s390_cpu_realizefn;

    scc->parent_reset = cc->reset;

    cc->reset = s390_cpu_reset;

    cc->do_interrupt = s390_cpu_do_interrupt;

    cc->dump_state = s390_cpu_dump_state;

    cc->set_pc = s390_cpu_set_pc;

    cc->gdb_read_register = s390_cpu_gdb_read_register;

    cc->gdb_write_register = s390_cpu_gdb_write_register;

#ifndef CONFIG_USER_ONLY

    cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;

#endif

    dc->vmsd = &vmstate_s390_cpu;

    cc->gdb_num_core_regs = S390_NUM_REGS;

}

static const TypeInfo s390_cpu_type_info = {

    .name = TYPE_S390_CPU,

    .parent = TYPE_CPU,

    .instance_size = sizeof(S390CPU),

    .instance_init = s390_cpu_initfn,

    .instance_finalize = s390_cpu_finalize,

    .abstract = false,

    .class_size = sizeof(S390CPUClass),

    .class_init = s390_cpu_class_init,

};

static void s390_cpu_register_types(void)

{

    type_register_static(&s390_cpu_type_info);

}

type_init(s390_cpu_register_types)