/*
 * RISC-V VMState Description
 *
 * Copyright (c) 2020 Huawei Technologies Co., Ltd
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2 or later, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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/>.
 */

#include "qemu/osdep.h"
#include "cpu.h"
#include "qemu/error-report.h"
#include "sysemu/kvm.h"
#include "migration/cpu.h"
#include "sysemu/cpu-timers.h"
#include "debug.h"

static bool pmp_needed(void *opaque)
{
    RISCVCPU *cpu = opaque;

    return cpu->cfg.pmp;
}

static int pmp_post_load(void *opaque, int version_id)
{
    RISCVCPU *cpu = opaque;
    CPURISCVState *env = &cpu->env;
    int i;

    for (i = 0; i < MAX_RISCV_PMPS; i++) {
        pmp_update_rule_addr(env, i);
    }
    pmp_update_rule_nums(env);

    return 0;
}

static const VMStateDescription vmstate_pmp_entry = {
    .name = "cpu/pmp/entry",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (const VMStateField[]) {
        VMSTATE_UINTTL(addr_reg, pmp_entry_t),
        VMSTATE_UINT8(cfg_reg, pmp_entry_t),
        VMSTATE_END_OF_LIST()
    }
};

static const VMStateDescription vmstate_pmp = {
    .name = "cpu/pmp",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = pmp_needed,
    .post_load = pmp_post_load,
    .fields = (const VMStateField[]) {
        VMSTATE_STRUCT_ARRAY(env.pmp_state.pmp, RISCVCPU, MAX_RISCV_PMPS,
                             0, vmstate_pmp_entry, pmp_entry_t),
        VMSTATE_END_OF_LIST()
    }
};

static bool hyper_needed(void *opaque)
{
    RISCVCPU *cpu = opaque;
    CPURISCVState *env = &cpu->env;

    return riscv_has_ext(env, RVH);
}

static const VMStateDescription vmstate_hyper = {
    .name = "cpu/hyper",
    .version_id = 3,
    .minimum_version_id = 3,
    .needed = hyper_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINTTL(env.hstatus, RISCVCPU),
        VMSTATE_UINTTL(env.hedeleg, RISCVCPU),
        VMSTATE_UINT64(env.hideleg, RISCVCPU),
        VMSTATE_UINTTL(env.hcounteren, RISCVCPU),
        VMSTATE_UINTTL(env.htval, RISCVCPU),
        VMSTATE_UINTTL(env.htinst, RISCVCPU),
        VMSTATE_UINTTL(env.hgatp, RISCVCPU),
        VMSTATE_UINTTL(env.hgeie, RISCVCPU),
        VMSTATE_UINTTL(env.hgeip, RISCVCPU),
        VMSTATE_UINT64(env.hvien, RISCVCPU),
        VMSTATE_UINT64(env.hvip, RISCVCPU),
        VMSTATE_UINT64(env.htimedelta, RISCVCPU),
        VMSTATE_UINT64(env.vstimecmp, RISCVCPU),

        VMSTATE_UINTTL(env.hvictl, RISCVCPU),
        VMSTATE_UINT8_ARRAY(env.hviprio, RISCVCPU, 64),

        VMSTATE_UINT64(env.vsstatus, RISCVCPU),
        VMSTATE_UINTTL(env.vstvec, RISCVCPU),
        VMSTATE_UINTTL(env.vsscratch, RISCVCPU),
        VMSTATE_UINTTL(env.vsepc, RISCVCPU),
        VMSTATE_UINTTL(env.vscause, RISCVCPU),
        VMSTATE_UINTTL(env.vstval, RISCVCPU),
        VMSTATE_UINTTL(env.vsatp, RISCVCPU),
        VMSTATE_UINTTL(env.vsiselect, RISCVCPU),
        VMSTATE_UINT64(env.vsie, RISCVCPU),

        VMSTATE_UINTTL(env.mtval2, RISCVCPU),
        VMSTATE_UINTTL(env.mtinst, RISCVCPU),

        VMSTATE_UINTTL(env.stvec_hs, RISCVCPU),
        VMSTATE_UINTTL(env.sscratch_hs, RISCVCPU),
        VMSTATE_UINTTL(env.sepc_hs, RISCVCPU),
        VMSTATE_UINTTL(env.scause_hs, RISCVCPU),
        VMSTATE_UINTTL(env.stval_hs, RISCVCPU),
        VMSTATE_UINTTL(env.satp_hs, RISCVCPU),
        VMSTATE_UINT64(env.mstatus_hs, RISCVCPU),

        VMSTATE_END_OF_LIST()
    }
};

static bool vector_needed(void *opaque)
{
    RISCVCPU *cpu = opaque;
    CPURISCVState *env = &cpu->env;

    return riscv_has_ext(env, RVV);
}

static const VMStateDescription vmstate_vector = {
    .name = "cpu/vector",
    .version_id = 2,
    .minimum_version_id = 2,
    .needed = vector_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT64_ARRAY(env.vreg, RISCVCPU, 32 * RV_VLEN_MAX / 64),
        VMSTATE_UINTTL(env.vxrm, RISCVCPU),
        VMSTATE_UINTTL(env.vxsat, RISCVCPU),
        VMSTATE_UINTTL(env.vl, RISCVCPU),
        VMSTATE_UINTTL(env.vstart, RISCVCPU),
        VMSTATE_UINTTL(env.vtype, RISCVCPU),
        VMSTATE_BOOL(env.vill, RISCVCPU),
        VMSTATE_END_OF_LIST()
    }
};

static bool pointermasking_needed(void *opaque)
{
    RISCVCPU *cpu = opaque;
    CPURISCVState *env = &cpu->env;

    return riscv_has_ext(env, RVJ);
}

static const VMStateDescription vmstate_pointermasking = {
    .name = "cpu/pointer_masking",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = pointermasking_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINTTL(env.mmte, RISCVCPU),
        VMSTATE_UINTTL(env.mpmmask, RISCVCPU),
        VMSTATE_UINTTL(env.mpmbase, RISCVCPU),
        VMSTATE_UINTTL(env.spmmask, RISCVCPU),
        VMSTATE_UINTTL(env.spmbase, RISCVCPU),
        VMSTATE_UINTTL(env.upmmask, RISCVCPU),
        VMSTATE_UINTTL(env.upmbase, RISCVCPU),

        VMSTATE_END_OF_LIST()
    }
};

static bool rv128_needed(void *opaque)
{
    RISCVCPUClass *mcc = RISCV_CPU_GET_CLASS(opaque);

    return mcc->misa_mxl_max == MXL_RV128;
}

static const VMStateDescription vmstate_rv128 = {
    .name = "cpu/rv128",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = rv128_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINTTL_ARRAY(env.gprh, RISCVCPU, 32),
        VMSTATE_UINT64(env.mscratchh, RISCVCPU),
        VMSTATE_UINT64(env.sscratchh, RISCVCPU),
        VMSTATE_END_OF_LIST()
    }
};

#ifdef CONFIG_KVM
static bool kvmtimer_needed(void *opaque)
{
    return kvm_enabled();
}

static int cpu_kvmtimer_post_load(void *opaque, int version_id)
{
    RISCVCPU *cpu = opaque;
    CPURISCVState *env = &cpu->env;

    env->kvm_timer_dirty = true;
    return 0;
}

static const VMStateDescription vmstate_kvmtimer = {
    .name = "cpu/kvmtimer",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = kvmtimer_needed,
    .post_load = cpu_kvmtimer_post_load,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT64(env.kvm_timer_time, RISCVCPU),
        VMSTATE_UINT64(env.kvm_timer_compare, RISCVCPU),
        VMSTATE_UINT64(env.kvm_timer_state, RISCVCPU),
        VMSTATE_END_OF_LIST()
    }
};
#endif

static bool debug_needed(void *opaque)
{
    RISCVCPU *cpu = opaque;

    return cpu->cfg.debug;
}

static int debug_post_load(void *opaque, int version_id)
{
    RISCVCPU *cpu = opaque;
    CPURISCVState *env = &cpu->env;

    if (icount_enabled()) {
        env->itrigger_enabled = riscv_itrigger_enabled(env);
    }

    return 0;
}

static const VMStateDescription vmstate_debug = {
    .name = "cpu/debug",
    .version_id = 2,
    .minimum_version_id = 2,
    .needed = debug_needed,
    .post_load = debug_post_load,
    .fields = (const VMStateField[]) {
        VMSTATE_UINTTL(env.trigger_cur, RISCVCPU),
        VMSTATE_UINTTL_ARRAY(env.tdata1, RISCVCPU, RV_MAX_TRIGGERS),
        VMSTATE_UINTTL_ARRAY(env.tdata2, RISCVCPU, RV_MAX_TRIGGERS),
        VMSTATE_UINTTL_ARRAY(env.tdata3, RISCVCPU, RV_MAX_TRIGGERS),
        VMSTATE_END_OF_LIST()
    }
};

static int riscv_cpu_post_load(void *opaque, int version_id)
{
    RISCVCPU *cpu = opaque;
    CPURISCVState *env = &cpu->env;

    env->xl = cpu_recompute_xl(env);
    riscv_cpu_update_mask(env);
    return 0;
}

static bool smstateen_needed(void *opaque)
{
    RISCVCPU *cpu = opaque;

    return cpu->cfg.ext_smstateen;
}

static const VMStateDescription vmstate_smstateen = {
    .name = "cpu/smtateen",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = smstateen_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT64_ARRAY(env.mstateen, RISCVCPU, 4),
        VMSTATE_UINT64_ARRAY(env.hstateen, RISCVCPU, 4),
        VMSTATE_UINT64_ARRAY(env.sstateen, RISCVCPU, 4),
        VMSTATE_END_OF_LIST()
    }
};

static bool envcfg_needed(void *opaque)
{
    RISCVCPU *cpu = opaque;
    CPURISCVState *env = &cpu->env;

    return (env->priv_ver >= PRIV_VERSION_1_12_0 ? 1 : 0);
}

static const VMStateDescription vmstate_envcfg = {
    .name = "cpu/envcfg",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = envcfg_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT64(env.menvcfg, RISCVCPU),
        VMSTATE_UINTTL(env.senvcfg, RISCVCPU),
        VMSTATE_UINT64(env.henvcfg, RISCVCPU),
        VMSTATE_END_OF_LIST()
    }
};

static bool pmu_needed(void *opaque)
{
    RISCVCPU *cpu = opaque;

    return (cpu->cfg.pmu_mask > 0);
}

static const VMStateDescription vmstate_pmu_ctr_state = {
    .name = "cpu/pmu",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = pmu_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINTTL(mhpmcounter_val, PMUCTRState),
        VMSTATE_UINTTL(mhpmcounterh_val, PMUCTRState),
        VMSTATE_UINTTL(mhpmcounter_prev, PMUCTRState),
        VMSTATE_UINTTL(mhpmcounterh_prev, PMUCTRState),
        VMSTATE_BOOL(started, PMUCTRState),
        VMSTATE_END_OF_LIST()
    }
};

static bool jvt_needed(void *opaque)
{
    RISCVCPU *cpu = opaque;

    return cpu->cfg.ext_zcmt;
}

static const VMStateDescription vmstate_jvt = {
    .name = "cpu/jvt",
    .version_id = 1,
    .minimum_version_id = 1,
    .needed = jvt_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINTTL(env.jvt, RISCVCPU),
        VMSTATE_END_OF_LIST()
    }
};

const VMStateDescription vmstate_riscv_cpu = {
    .name = "cpu",
    .version_id = 9,
    .minimum_version_id = 9,
    .post_load = riscv_cpu_post_load,
    .fields = (const VMStateField[]) {
        VMSTATE_UINTTL_ARRAY(env.gpr, RISCVCPU, 32),
        VMSTATE_UINT64_ARRAY(env.fpr, RISCVCPU, 32),
        VMSTATE_UINT8_ARRAY(env.miprio, RISCVCPU, 64),
        VMSTATE_UINT8_ARRAY(env.siprio, RISCVCPU, 64),
        VMSTATE_UINTTL(env.pc, RISCVCPU),
        VMSTATE_UINTTL(env.load_res, RISCVCPU),
        VMSTATE_UINTTL(env.load_val, RISCVCPU),
        VMSTATE_UINTTL(env.frm, RISCVCPU),
        VMSTATE_UINTTL(env.badaddr, RISCVCPU),
        VMSTATE_UINTTL(env.guest_phys_fault_addr, RISCVCPU),
        VMSTATE_UINTTL(env.priv_ver, RISCVCPU),
        VMSTATE_UINTTL(env.vext_ver, RISCVCPU),
        VMSTATE_UINT32(env.misa_mxl, RISCVCPU),
        VMSTATE_UINT32(env.misa_ext, RISCVCPU),
        VMSTATE_UNUSED(4),
        VMSTATE_UINT32(env.misa_ext_mask, RISCVCPU),
        VMSTATE_UINTTL(env.priv, RISCVCPU),
        VMSTATE_BOOL(env.virt_enabled, RISCVCPU),
        VMSTATE_UINT64(env.resetvec, RISCVCPU),
        VMSTATE_UINTTL(env.mhartid, RISCVCPU),
        VMSTATE_UINT64(env.mstatus, RISCVCPU),
        VMSTATE_UINT64(env.mip, RISCVCPU),
        VMSTATE_UINT64(env.miclaim, RISCVCPU),
        VMSTATE_UINT64(env.mie, RISCVCPU),
        VMSTATE_UINT64(env.mvien, RISCVCPU),
        VMSTATE_UINT64(env.mvip, RISCVCPU),
        VMSTATE_UINT64(env.sie, RISCVCPU),
        VMSTATE_UINT64(env.mideleg, RISCVCPU),
        VMSTATE_UINTTL(env.satp, RISCVCPU),
        VMSTATE_UINTTL(env.stval, RISCVCPU),
        VMSTATE_UINTTL(env.medeleg, RISCVCPU),
        VMSTATE_UINTTL(env.stvec, RISCVCPU),
        VMSTATE_UINTTL(env.sepc, RISCVCPU),
        VMSTATE_UINTTL(env.scause, RISCVCPU),
        VMSTATE_UINTTL(env.mtvec, RISCVCPU),
        VMSTATE_UINTTL(env.mepc, RISCVCPU),
        VMSTATE_UINTTL(env.mcause, RISCVCPU),
        VMSTATE_UINTTL(env.mtval, RISCVCPU),
        VMSTATE_UINTTL(env.miselect, RISCVCPU),
        VMSTATE_UINTTL(env.siselect, RISCVCPU),
        VMSTATE_UINTTL(env.scounteren, RISCVCPU),
        VMSTATE_UINTTL(env.mcounteren, RISCVCPU),
        VMSTATE_UINTTL(env.mcountinhibit, RISCVCPU),
        VMSTATE_STRUCT_ARRAY(env.pmu_ctrs, RISCVCPU, RV_MAX_MHPMCOUNTERS, 0,
                             vmstate_pmu_ctr_state, PMUCTRState),
        VMSTATE_UINTTL_ARRAY(env.mhpmevent_val, RISCVCPU, RV_MAX_MHPMEVENTS),
        VMSTATE_UINTTL_ARRAY(env.mhpmeventh_val, RISCVCPU, RV_MAX_MHPMEVENTS),
        VMSTATE_UINTTL(env.sscratch, RISCVCPU),
        VMSTATE_UINTTL(env.mscratch, RISCVCPU),
        VMSTATE_UINT64(env.stimecmp, RISCVCPU),

        VMSTATE_END_OF_LIST()
    },
    .subsections = (const VMStateDescription * const []) {
        &vmstate_pmp,
        &vmstate_hyper,
        &vmstate_vector,
        &vmstate_pointermasking,
        &vmstate_rv128,
#ifdef CONFIG_KVM
        &vmstate_kvmtimer,
#endif
        &vmstate_envcfg,
        &vmstate_debug,
        &vmstate_smstateen,
        &vmstate_jvt,
        NULL
    }
};