/*
 * QEMU HPPA CPU
 *
 * Copyright (c) 2016 Richard Henderson <rth@twiddle.net>
 *
 * 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"
#include "fpu/softfloat.h"


static void hppa_cpu_set_pc(CPUState *cs, vaddr value)
{
    HPPACPU *cpu = HPPA_CPU(cs);

    cpu->env.iaoq_f = value;
    cpu->env.iaoq_b = value + 4;
}

static void hppa_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
{
    HPPACPU *cpu = HPPA_CPU(cs);

#ifdef CONFIG_USER_ONLY
    cpu->env.iaoq_f = tb->pc;
    cpu->env.iaoq_b = tb->cs_base;
#else
    /* Recover the IAOQ values from the GVA + PRIV.  */
    uint32_t priv = (tb->flags >> TB_FLAG_PRIV_SHIFT) & 3;
    target_ulong cs_base = tb->cs_base;
    target_ulong iasq_f = cs_base & ~0xffffffffull;
    int32_t diff = cs_base;

    cpu->env.iasq_f = iasq_f;
    cpu->env.iaoq_f = (tb->pc & ~iasq_f) + priv;
    if (diff) {
        cpu->env.iaoq_b = cpu->env.iaoq_f + diff;
    }
#endif

    cpu->env.psw_n = (tb->flags & PSW_N) != 0;
}

static bool hppa_cpu_has_work(CPUState *cs)
{
    return cs->interrupt_request & CPU_INTERRUPT_HARD;
}

static void hppa_cpu_disas_set_info(CPUState *cs, disassemble_info *info)
{
    info->mach = bfd_mach_hppa20;
    info->print_insn = print_insn_hppa;
}

static void hppa_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
                                         MMUAccessType access_type,
                                         int mmu_idx, uintptr_t retaddr)
{
    HPPACPU *cpu = HPPA_CPU(cs);
    CPUHPPAState *env = &cpu->env;

    cs->exception_index = EXCP_UNALIGN;
    if (env->psw & PSW_Q) {
        /* ??? Needs tweaking for hppa64.  */
        env->cr[CR_IOR] = addr;
        env->cr[CR_ISR] = addr >> 32;
    }

    cpu_loop_exit_restore(cs, retaddr);
}

static void hppa_cpu_realizefn(DeviceState *dev, Error **errp)
{
    CPUState *cs = CPU(dev);
    HPPACPUClass *acc = HPPA_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);

#ifndef CONFIG_USER_ONLY
    {
        HPPACPU *cpu = HPPA_CPU(cs);
        cpu->alarm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
                                        hppa_cpu_alarm_timer, cpu);
    }
#endif
}

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

    list = object_class_get_list_sorted(TYPE_HPPA_CPU, false);
    (*cpu_fprintf)(f, "Available CPUs:\n");
    g_slist_foreach(list, hppa_cpu_list_entry, &s);
    g_slist_free(list);
}

static void hppa_cpu_initfn(Object *obj)
{
    CPUState *cs = CPU(obj);
    HPPACPU *cpu = HPPA_CPU(obj);
    CPUHPPAState *env = &cpu->env;

    cs->env_ptr = env;
    cs->exception_index = -1;
    cpu_hppa_loaded_fr0(env);
    set_snan_bit_is_one(true, &env->fp_status);
    cpu_hppa_put_psw(env, PSW_W);
}

static ObjectClass *hppa_cpu_class_by_name(const char *cpu_model)
{
    return object_class_by_name(TYPE_HPPA_CPU);
}

static void hppa_cpu_class_init(ObjectClass *oc, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(oc);
    CPUClass *cc = CPU_CLASS(oc);
    HPPACPUClass *acc = HPPA_CPU_CLASS(oc);

    device_class_set_parent_realize(dc, hppa_cpu_realizefn,
                                    &acc->parent_realize);

    cc->class_by_name = hppa_cpu_class_by_name;
    cc->has_work = hppa_cpu_has_work;
    cc->do_interrupt = hppa_cpu_do_interrupt;
    cc->cpu_exec_interrupt = hppa_cpu_exec_interrupt;
    cc->dump_state = hppa_cpu_dump_state;
    cc->set_pc = hppa_cpu_set_pc;
    cc->synchronize_from_tb = hppa_cpu_synchronize_from_tb;
    cc->gdb_read_register = hppa_cpu_gdb_read_register;
    cc->gdb_write_register = hppa_cpu_gdb_write_register;
#ifdef CONFIG_USER_ONLY
    cc->handle_mmu_fault = hppa_cpu_handle_mmu_fault;
#else
    cc->get_phys_page_debug = hppa_cpu_get_phys_page_debug;
    dc->vmsd = &vmstate_hppa_cpu;
#endif
    cc->do_unaligned_access = hppa_cpu_do_unaligned_access;
    cc->disas_set_info = hppa_cpu_disas_set_info;
    cc->tcg_initialize = hppa_translate_init;

    cc->gdb_num_core_regs = 128;
}

static const TypeInfo hppa_cpu_type_info = {
    .name = TYPE_HPPA_CPU,
    .parent = TYPE_CPU,
    .instance_size = sizeof(HPPACPU),
    .instance_init = hppa_cpu_initfn,
    .abstract = false,
    .class_size = sizeof(HPPACPUClass),
    .class_init = hppa_cpu_class_init,
};

static void hppa_cpu_register_types(void)
{
    type_register_static(&hppa_cpu_type_info);
}

type_init(hppa_cpu_register_types)