/*
 * QEMU Alpha CPU
 *
 * Copyright (c) 2007 Jocelyn Mayer
 * Copyright (c) 2012 SUSE LINUX Products GmbH
 *
 * 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>
 */

#include "qemu/osdep.h"
#include "qapi/error.h"
#include "cpu.h"
#include "qemu-common.h"
#include "exec/exec-all.h"


static void alpha_cpu_set_pc(CPUState *cs, vaddr value)
{
    AlphaCPU *cpu = ALPHA_CPU(cs);

    cpu->env.pc = value;
}

static bool alpha_cpu_has_work(CPUState *cs)
{
    /* Here we are checking to see if the CPU should wake up from HALT.
       We will have gotten into this state only for WTINT from PALmode.  */
    /* ??? I'm not sure how the IPL state works with WTINT to keep a CPU
       asleep even if (some) interrupts have been asserted.  For now,
       assume that if a CPU really wants to stay asleep, it will mask
       interrupts at the chipset level, which will prevent these bits
       from being set in the first place.  */
    return cs->interrupt_request & (CPU_INTERRUPT_HARD
                                    | CPU_INTERRUPT_TIMER
                                    | CPU_INTERRUPT_SMP
                                    | CPU_INTERRUPT_MCHK);
}

static void alpha_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
{
    info->mach = bfd_mach_alpha_ev6;
    info->print_insn = print_insn_alpha;
}

static void alpha_cpu_realizefn(DeviceState *dev, Error **errp)
{
    CPUState *cs = CPU(dev);
    AlphaCPUClass *acc = ALPHA_CPU_GET_CLASS(dev);
    Error *local_err = NULL;

    cpu_exec_realizefn(cs, &local_err);
    if (local_err != NULL) {
        error_propagate(errp, local_err);
        return;
    }

    qemu_init_vcpu(cs);

    acc->parent_realize(dev, errp);
}

/* Sort alphabetically by type name. */
static gint alpha_cpu_list_compare(gconstpointer a, gconstpointer b)
{
    ObjectClass *class_a = (ObjectClass *)a;
    ObjectClass *class_b = (ObjectClass *)b;
    const char *name_a, *name_b;

    name_a = object_class_get_name(class_a);
    name_b = object_class_get_name(class_b);
    return strcmp(name_a, name_b);
}

static void alpha_cpu_list_entry(gpointer data, gpointer user_data)
{
    ObjectClass *oc = data;
    CPUListState *s = user_data;

    (*s->cpu_fprintf)(s->file, "  %s\n",
                      object_class_get_name(oc));
}

void alpha_cpu_list(FILE *f, fprintf_function cpu_fprintf)
{
    CPUListState s = {
        .file = f,
        .cpu_fprintf = cpu_fprintf,
    };
    GSList *list;

    list = object_class_get_list(TYPE_ALPHA_CPU, false);
    list = g_slist_sort(list, alpha_cpu_list_compare);
    (*cpu_fprintf)(f, "Available CPUs:\n");
    g_slist_foreach(list, alpha_cpu_list_entry, &s);
    g_slist_free(list);
}

/* Models */

#define TYPE(model) model "-" TYPE_ALPHA_CPU

typedef struct AlphaCPUAlias {
    const char *alias;
    const char *typename;
} AlphaCPUAlias;

static const AlphaCPUAlias alpha_cpu_aliases[] = {
    { "21064",   TYPE("ev4") },
    { "21164",   TYPE("ev5") },
    { "21164a",  TYPE("ev56") },
    { "21164pc", TYPE("pca56") },
    { "21264",   TYPE("ev6") },
    { "21264a",  TYPE("ev67") },
};

static ObjectClass *alpha_cpu_class_by_name(const char *cpu_model)
{
    ObjectClass *oc = NULL;
    char *typename;
    int i;

    if (cpu_model == NULL) {
        return NULL;
    }

    oc = object_class_by_name(cpu_model);
    if (oc != NULL && object_class_dynamic_cast(oc, TYPE_ALPHA_CPU) != NULL &&
        !object_class_is_abstract(oc)) {
        return oc;
    }

    for (i = 0; i < ARRAY_SIZE(alpha_cpu_aliases); i++) {
        if (strcmp(cpu_model, alpha_cpu_aliases[i].alias) == 0) {
            oc = object_class_by_name(alpha_cpu_aliases[i].typename);
            assert(oc != NULL && !object_class_is_abstract(oc));
            return oc;
        }
    }

    typename = g_strdup_printf("%s-" TYPE_ALPHA_CPU, cpu_model);
    oc = object_class_by_name(typename);
    g_free(typename);
    if (oc != NULL && object_class_is_abstract(oc)) {
        oc = NULL;
    }

    /* TODO: remove match everything nonsense */
    /* Default to ev67; no reason not to emulate insns by default. */
    if (!oc) {
        oc = object_class_by_name(TYPE("ev67"));
    }

    return oc;
}

static void ev4_cpu_initfn(Object *obj)
{
    AlphaCPU *cpu = ALPHA_CPU(obj);
    CPUAlphaState *env = &cpu->env;

    env->implver = IMPLVER_2106x;
}

static const TypeInfo ev4_cpu_type_info = {
    .name = TYPE("ev4"),
    .parent = TYPE_ALPHA_CPU,
    .instance_init = ev4_cpu_initfn,
};

static void ev5_cpu_initfn(Object *obj)
{
    AlphaCPU *cpu = ALPHA_CPU(obj);
    CPUAlphaState *env = &cpu->env;

    env->implver = IMPLVER_21164;
}

static const TypeInfo ev5_cpu_type_info = {
    .name = TYPE("ev5"),
    .parent = TYPE_ALPHA_CPU,
    .instance_init = ev5_cpu_initfn,
};

static void ev56_cpu_initfn(Object *obj)
{
    AlphaCPU *cpu = ALPHA_CPU(obj);
    CPUAlphaState *env = &cpu->env;

    env->amask |= AMASK_BWX;
}

static const TypeInfo ev56_cpu_type_info = {
    .name = TYPE("ev56"),
    .parent = TYPE("ev5"),
    .instance_init = ev56_cpu_initfn,
};

static void pca56_cpu_initfn(Object *obj)
{
    AlphaCPU *cpu = ALPHA_CPU(obj);
    CPUAlphaState *env = &cpu->env;

    env->amask |= AMASK_MVI;
}

static const TypeInfo pca56_cpu_type_info = {
    .name = TYPE("pca56"),
    .parent = TYPE("ev56"),
    .instance_init = pca56_cpu_initfn,
};

static void ev6_cpu_initfn(Object *obj)
{
    AlphaCPU *cpu = ALPHA_CPU(obj);
    CPUAlphaState *env = &cpu->env;

    env->implver = IMPLVER_21264;
    env->amask = AMASK_BWX | AMASK_FIX | AMASK_MVI | AMASK_TRAP;
}

static const TypeInfo ev6_cpu_type_info = {
    .name = TYPE("ev6"),
    .parent = TYPE_ALPHA_CPU,
    .instance_init = ev6_cpu_initfn,
};

static void ev67_cpu_initfn(Object *obj)
{
    AlphaCPU *cpu = ALPHA_CPU(obj);
    CPUAlphaState *env = &cpu->env;

    env->amask |= AMASK_CIX | AMASK_PREFETCH;
}

static const TypeInfo ev67_cpu_type_info = {
    .name = TYPE("ev67"),
    .parent = TYPE("ev6"),
    .instance_init = ev67_cpu_initfn,
};

static const TypeInfo ev68_cpu_type_info = {
    .name = TYPE("ev68"),
    .parent = TYPE("ev67"),
};

static void alpha_cpu_initfn(Object *obj)
{
    CPUState *cs = CPU(obj);
    AlphaCPU *cpu = ALPHA_CPU(obj);
    CPUAlphaState *env = &cpu->env;

    cs->env_ptr = env;
    tlb_flush(cs);

    alpha_translate_init();

    env->lock_addr = -1;
#if defined(CONFIG_USER_ONLY)
    env->flags = ENV_FLAG_PS_USER | ENV_FLAG_FEN;
    cpu_alpha_store_fpcr(env, (FPCR_INVD | FPCR_DZED | FPCR_OVFD
                               | FPCR_UNFD | FPCR_INED | FPCR_DNOD
                               | FPCR_DYN_NORMAL));
#else
    env->flags = ENV_FLAG_PAL_MODE | ENV_FLAG_FEN;
#endif
}

static void alpha_cpu_class_init(ObjectClass *oc, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(oc);
    CPUClass *cc = CPU_CLASS(oc);
    AlphaCPUClass *acc = ALPHA_CPU_CLASS(oc);

    acc->parent_realize = dc->realize;
    dc->realize = alpha_cpu_realizefn;

    cc->class_by_name = alpha_cpu_class_by_name;
    cc->has_work = alpha_cpu_has_work;
    cc->do_interrupt = alpha_cpu_do_interrupt;
    cc->cpu_exec_interrupt = alpha_cpu_exec_interrupt;
    cc->dump_state = alpha_cpu_dump_state;
    cc->set_pc = alpha_cpu_set_pc;
    cc->gdb_read_register = alpha_cpu_gdb_read_register;
    cc->gdb_write_register = alpha_cpu_gdb_write_register;
#ifdef CONFIG_USER_ONLY
    cc->handle_mmu_fault = alpha_cpu_handle_mmu_fault;
#else
    cc->do_transaction_failed = alpha_cpu_do_transaction_failed;
    cc->do_unaligned_access = alpha_cpu_do_unaligned_access;
    cc->get_phys_page_debug = alpha_cpu_get_phys_page_debug;
    dc->vmsd = &vmstate_alpha_cpu;
#endif
    cc->disas_set_info = alpha_cpu_disas_set_info;

    cc->gdb_num_core_regs = 67;
}

static const TypeInfo alpha_cpu_type_info = {
    .name = TYPE_ALPHA_CPU,
    .parent = TYPE_CPU,
    .instance_size = sizeof(AlphaCPU),
    .instance_init = alpha_cpu_initfn,
    .abstract = true,
    .class_size = sizeof(AlphaCPUClass),
    .class_init = alpha_cpu_class_init,
};

static void alpha_cpu_register_types(void)
{
    type_register_static(&alpha_cpu_type_info);
    type_register_static(&ev4_cpu_type_info);
    type_register_static(&ev5_cpu_type_info);
    type_register_static(&ev56_cpu_type_info);
    type_register_static(&pca56_cpu_type_info);
    type_register_static(&ev6_cpu_type_info);
    type_register_static(&ev67_cpu_type_info);
    type_register_static(&ev68_cpu_type_info);
}

type_init(alpha_cpu_register_types)