/*
 *  x86 misc helpers
 *
 *  Copyright (c) 2003 Fabrice Bellard
 *
 * 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 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/>.
 */

#include "qemu/osdep.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
#include "exec/ioport.h"

#include "uc_priv.h"

void helper_outb(CPUX86State *env, uint32_t port, uint32_t data)
{
// #ifdef UNICORN_ARCH_POSTFIX
//     glue(address_space_stb, UNICORN_ARCH_POSTFIX)(env->uc, &env->uc->address_space_io, port, data & 0xff,
// #else
//     address_space_stb(env->uc, &env->uc->address_space_io, port, data & 0xff,
// #endif
//                       cpu_get_mem_attrs(env), NULL);
    return cpu_outb(env->uc, port, data);
}

target_ulong helper_inb(CPUX86State *env, uint32_t port)
{
// #ifdef UNICORN_ARCH_POSTFIX
//     return glue(address_space_ldub, UNICORN_ARCH_POSTFIX)(env->uc, &env->uc->address_space_io, port,
// #else
//     return address_space_ldub(env->uc, &env->uc->address_space_io, port,
// #endif
//                               cpu_get_mem_attrs(env), NULL);
    return cpu_inb(env->uc, port);
}

void helper_outw(CPUX86State *env, uint32_t port, uint32_t data)
{
// #ifdef UNICORN_ARCH_POSTFIX
//     glue(address_space_stw, UNICORN_ARCH_POSTFIX)(env->uc, &env->uc->address_space_io, port, data & 0xffff,
// #else
//     address_space_stw(env->uc, &env->uc->address_space_io, port, data & 0xffff,
// #endif
//                       cpu_get_mem_attrs(env), NULL);
    return cpu_outw(env->uc, port, data);
}

target_ulong helper_inw(CPUX86State *env, uint32_t port)
{
// #ifdef UNICORN_ARCH_POSTFIX
//     return glue(address_space_lduw, UNICORN_ARCH_POSTFIX)(env->uc, &env->uc->address_space_io, port,
// #else
//     return address_space_lduw(env->uc, &env->uc->address_space_io, port,
// #endif
//                               cpu_get_mem_attrs(env), NULL);
    return cpu_inw(env->uc, port);
}

void helper_outl(CPUX86State *env, uint32_t port, uint32_t data)
{
// #ifdef UNICORN_ARCH_POSTFIX
//     glue(address_space_stl, UNICORN_ARCH_POSTFIX)(env->uc, &env->uc->address_space_io, port, data,
// #else
//     address_space_stl(env->uc, &env->uc->address_space_io, port, data,
// #endif
//                       cpu_get_mem_attrs(env), NULL);
    return cpu_outl(env->uc, port, data);
}

target_ulong helper_inl(CPUX86State *env, uint32_t port)
{
// #ifdef UNICORN_ARCH_POSTFIX
//     return glue(address_space_ldl, UNICORN_ARCH_POSTFIX)(env->uc, &env->uc->address_space_io, port,
// #else
//     return address_space_ldl(env->uc, &env->uc->address_space_io, port,
// #endif
//                              cpu_get_mem_attrs(env), NULL);
    return cpu_inl(env->uc, port);
}

void helper_into(CPUX86State *env, int next_eip_addend)
{
    int eflags;

    eflags = cpu_cc_compute_all(env, CC_OP);
    if (eflags & CC_O) {
        raise_interrupt(env, EXCP04_INTO, 1, 0, next_eip_addend);
    }
}

void helper_cpuid(CPUX86State *env)
{
    uint32_t eax, ebx, ecx, edx;
    struct hook *hook;
    int skip_cpuid = 0;

    cpu_svm_check_intercept_param(env, SVM_EXIT_CPUID, 0, GETPC());

    // Unicorn: call registered CPUID hooks
    HOOK_FOREACH_VAR_DECLARE;
    HOOK_FOREACH(env->uc, hook, UC_HOOK_INSN) {
        if (hook->to_delete)
            continue;
        if (!HOOK_BOUND_CHECK(hook, env->eip))
            continue;
        
        // Multiple cpuid callbacks returning different values is undefined.
        // true -> skip the cpuid instruction
        if (hook->insn == UC_X86_INS_CPUID)
            skip_cpuid = ((uc_cb_insn_cpuid_t)hook->callback)(env->uc, hook->user_data);

        // the last callback may already asked to stop emulation
        if (env->uc->stop_request)
            break;
    }

    if (!skip_cpuid) {
        cpu_x86_cpuid(env, (uint32_t)env->regs[R_EAX], (uint32_t)env->regs[R_ECX],
                    &eax, &ebx, &ecx, &edx);
        env->regs[R_EAX] = eax;
        env->regs[R_EBX] = ebx;
        env->regs[R_ECX] = ecx;
        env->regs[R_EDX] = edx;
    }
    
}

target_ulong helper_read_crN(CPUX86State *env, int reg)
{
    target_ulong val;

    cpu_svm_check_intercept_param(env, SVM_EXIT_READ_CR0 + reg, 0, GETPC());
    switch (reg) {
    default:
        val = env->cr[reg];
        break;
    case 8:
        if (!(env->hflags2 & HF2_VINTR_MASK)) {
            // val = cpu_get_apic_tpr(env_archcpu(env)->apic_state);
            val = 0;
        } else {
            val = env->v_tpr;
        }
        break;
    }
    return val;
}

void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
{
    cpu_svm_check_intercept_param(env, SVM_EXIT_WRITE_CR0 + reg, 0, GETPC());
    switch (reg) {
    case 0:
        cpu_x86_update_cr0(env, (uint32_t)t0);
        break;
    case 3:
        cpu_x86_update_cr3(env, t0);
        break;
    case 4:
        cpu_x86_update_cr4(env, (uint32_t)t0);
        break;
    case 8:
#if 0
        if (!(env->hflags2 & HF2_VINTR_MASK)) {
            cpu_set_apic_tpr(env_archcpu(env)->apic_state, t0);
        }
#endif
        env->v_tpr = t0 & 0x0f;
        break;
    default:
        env->cr[reg] = t0;
        break;
    }
}

void helper_lmsw(CPUX86State *env, target_ulong t0)
{
    /* only 4 lower bits of CR0 are modified. PE cannot be set to zero
       if already set to one. */
    t0 = (env->cr[0] & ~0xe) | (t0 & 0xf);
    helper_write_crN(env, 0, t0);
}

void helper_invlpg(CPUX86State *env, target_ulong addr)
{
    X86CPU *cpu = env_archcpu(env);

    cpu_svm_check_intercept_param(env, SVM_EXIT_INVLPG, 0, GETPC());
    tlb_flush_page(CPU(cpu), addr);
}

void helper_rdtsc(CPUX86State *env)
{
    uint64_t val;

    if ((env->cr[4] & CR4_TSD_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
        raise_exception_ra(env, EXCP0D_GPF, GETPC());
    }
    cpu_svm_check_intercept_param(env, SVM_EXIT_RDTSC, 0, GETPC());

    val = cpu_get_tsc(env) + env->tsc_offset;
    env->regs[R_EAX] = (uint32_t)(val);
    env->regs[R_EDX] = (uint32_t)(val >> 32);
}

void helper_rdtscp(CPUX86State *env)
{
    helper_rdtsc(env);
    env->regs[R_ECX] = (uint32_t)(env->tsc_aux);
}

void helper_rdpmc(CPUX86State *env)
{
    if ((env->cr[4] & CR4_PCE_MASK) && ((env->hflags & HF_CPL_MASK) != 0)) {
        raise_exception_ra(env, EXCP0D_GPF, GETPC());
    }
    cpu_svm_check_intercept_param(env, SVM_EXIT_RDPMC, 0, GETPC());

    /* currently unimplemented */
    qemu_log_mask(LOG_UNIMP, "x86: unimplemented rdpmc\n");
    raise_exception_err(env, EXCP06_ILLOP, 0);
}

void helper_wrmsr(CPUX86State *env)
{
    uint64_t val;

    cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 1, GETPC());

    val = ((uint32_t)env->regs[R_EAX]) |
        ((uint64_t)((uint32_t)env->regs[R_EDX]) << 32);

    switch ((uint32_t)env->regs[R_ECX]) {
    case MSR_IA32_SYSENTER_CS:
        env->sysenter_cs = val & 0xffff;
        break;
    case MSR_IA32_SYSENTER_ESP:
        env->sysenter_esp = val;
        break;
    case MSR_IA32_SYSENTER_EIP:
        env->sysenter_eip = val;
        break;
    case MSR_IA32_APICBASE:
        // cpu_set_apic_base(env_archcpu(env)->apic_state, val);
        break;
    case MSR_EFER:
        {
            uint64_t update_mask;

            update_mask = 0;
            if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_SYSCALL) {
                update_mask |= MSR_EFER_SCE;
            }
            if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) {
                update_mask |= MSR_EFER_LME;
            }
            if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_FFXSR) {
                update_mask |= MSR_EFER_FFXSR;
            }
            if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_NX) {
                update_mask |= MSR_EFER_NXE;
            }
            if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM) {
                update_mask |= MSR_EFER_SVME;
            }
            if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_FFXSR) {
                update_mask |= MSR_EFER_FFXSR;
            }
            cpu_load_efer(env, (env->efer & ~update_mask) |
                          (val & update_mask));
        }
        break;
    case MSR_STAR:
        env->star = val;
        break;
    case MSR_PAT:
        env->pat = val;
        break;
    case MSR_VM_HSAVE_PA:
        env->vm_hsave = val;
        break;
#ifdef TARGET_X86_64
    case MSR_LSTAR:
        env->lstar = val;
        break;
    case MSR_CSTAR:
        env->cstar = val;
        break;
    case MSR_FMASK:
        env->fmask = val;
        break;
    case MSR_FSBASE:
        env->segs[R_FS].base = val;
        break;
    case MSR_GSBASE:
        env->segs[R_GS].base = val;
        break;
    case MSR_KERNELGSBASE:
        env->kernelgsbase = val;
        break;
#endif
    case MSR_MTRRphysBase(0):
    case MSR_MTRRphysBase(1):
    case MSR_MTRRphysBase(2):
    case MSR_MTRRphysBase(3):
    case MSR_MTRRphysBase(4):
    case MSR_MTRRphysBase(5):
    case MSR_MTRRphysBase(6):
    case MSR_MTRRphysBase(7):
        env->mtrr_var[((uint32_t)env->regs[R_ECX] -
                       MSR_MTRRphysBase(0)) / 2].base = val;
        break;
    case MSR_MTRRphysMask(0):
    case MSR_MTRRphysMask(1):
    case MSR_MTRRphysMask(2):
    case MSR_MTRRphysMask(3):
    case MSR_MTRRphysMask(4):
    case MSR_MTRRphysMask(5):
    case MSR_MTRRphysMask(6):
    case MSR_MTRRphysMask(7):
        env->mtrr_var[((uint32_t)env->regs[R_ECX] -
                       MSR_MTRRphysMask(0)) / 2].mask = val;
        break;
    case MSR_MTRRfix64K_00000:
        env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
                        MSR_MTRRfix64K_00000] = val;
        break;
    case MSR_MTRRfix16K_80000:
    case MSR_MTRRfix16K_A0000:
        env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
                        MSR_MTRRfix16K_80000 + 1] = val;
        break;
    case MSR_MTRRfix4K_C0000:
    case MSR_MTRRfix4K_C8000:
    case MSR_MTRRfix4K_D0000:
    case MSR_MTRRfix4K_D8000:
    case MSR_MTRRfix4K_E0000:
    case MSR_MTRRfix4K_E8000:
    case MSR_MTRRfix4K_F0000:
    case MSR_MTRRfix4K_F8000:
        env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
                        MSR_MTRRfix4K_C0000 + 3] = val;
        break;
    case MSR_MTRRdefType:
        env->mtrr_deftype = val;
        break;
    case MSR_MCG_STATUS:
        env->mcg_status = val;
        break;
    case MSR_MCG_CTL:
        if ((env->mcg_cap & MCG_CTL_P)
            && (val == 0 || val == ~(uint64_t)0)) {
            env->mcg_ctl = val;
        }
        break;
    case MSR_TSC_AUX:
        env->tsc_aux = val;
        break;
    case MSR_IA32_MISC_ENABLE:
        env->msr_ia32_misc_enable = val;
        break;
    case MSR_IA32_BNDCFGS:
        /* FIXME: #GP if reserved bits are set.  */
        /* FIXME: Extend highest implemented bit of linear address.  */
        env->msr_bndcfgs = val;
        cpu_sync_bndcs_hflags(env);
        break;
    default:
        if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
            && (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +
            (4 * env->mcg_cap & 0xff)) {
            uint32_t offset = (uint32_t)env->regs[R_ECX] - MSR_MC0_CTL;
            if ((offset & 0x3) != 0
                || (val == 0 || val == ~(uint64_t)0)) {
                env->mce_banks[offset] = val;
            }
            break;
        }
        /* XXX: exception? */
        break;
    }
}

void helper_rdmsr(CPUX86State *env)
{
    X86CPU *x86_cpu = env_archcpu(env);
    uint64_t val;

    cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 0, GETPC());

    switch ((uint32_t)env->regs[R_ECX]) {
    case MSR_IA32_SYSENTER_CS:
        val = env->sysenter_cs;
        break;
    case MSR_IA32_SYSENTER_ESP:
        val = env->sysenter_esp;
        break;
    case MSR_IA32_SYSENTER_EIP:
        val = env->sysenter_eip;
        break;
    case MSR_IA32_APICBASE:
        val = 0; // cpu_get_apic_base(env_archcpu(env)->apic_state);
        break;
    case MSR_EFER:
        val = env->efer;
        break;
    case MSR_STAR:
        val = env->star;
        break;
    case MSR_PAT:
        val = env->pat;
        break;
    case MSR_VM_HSAVE_PA:
        val = env->vm_hsave;
        break;
    case MSR_IA32_PERF_STATUS:
        /* tsc_increment_by_tick */
        val = 1000ULL;
        /* CPU multiplier */
        val |= (((uint64_t)4ULL) << 40);
        break;
#ifdef TARGET_X86_64
    case MSR_LSTAR:
        val = env->lstar;
        break;
    case MSR_CSTAR:
        val = env->cstar;
        break;
    case MSR_FMASK:
        val = env->fmask;
        break;
    case MSR_FSBASE:
        val = env->segs[R_FS].base;
        break;
    case MSR_GSBASE:
        val = env->segs[R_GS].base;
        break;
    case MSR_KERNELGSBASE:
        val = env->kernelgsbase;
        break;
    case MSR_TSC_AUX:
        val = env->tsc_aux;
        break;
#endif
    case MSR_SMI_COUNT:
        val = env->msr_smi_count;
        break;
    case MSR_MTRRphysBase(0):
    case MSR_MTRRphysBase(1):
    case MSR_MTRRphysBase(2):
    case MSR_MTRRphysBase(3):
    case MSR_MTRRphysBase(4):
    case MSR_MTRRphysBase(5):
    case MSR_MTRRphysBase(6):
    case MSR_MTRRphysBase(7):
        val = env->mtrr_var[((uint32_t)env->regs[R_ECX] -
                             MSR_MTRRphysBase(0)) / 2].base;
        break;
    case MSR_MTRRphysMask(0):
    case MSR_MTRRphysMask(1):
    case MSR_MTRRphysMask(2):
    case MSR_MTRRphysMask(3):
    case MSR_MTRRphysMask(4):
    case MSR_MTRRphysMask(5):
    case MSR_MTRRphysMask(6):
    case MSR_MTRRphysMask(7):
        val = env->mtrr_var[((uint32_t)env->regs[R_ECX] -
                             MSR_MTRRphysMask(0)) / 2].mask;
        break;
    case MSR_MTRRfix64K_00000:
        val = env->mtrr_fixed[0];
        break;
    case MSR_MTRRfix16K_80000:
    case MSR_MTRRfix16K_A0000:
        val = env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
                              MSR_MTRRfix16K_80000 + 1];
        break;
    case MSR_MTRRfix4K_C0000:
    case MSR_MTRRfix4K_C8000:
    case MSR_MTRRfix4K_D0000:
    case MSR_MTRRfix4K_D8000:
    case MSR_MTRRfix4K_E0000:
    case MSR_MTRRfix4K_E8000:
    case MSR_MTRRfix4K_F0000:
    case MSR_MTRRfix4K_F8000:
        val = env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
                              MSR_MTRRfix4K_C0000 + 3];
        break;
    case MSR_MTRRdefType:
        val = env->mtrr_deftype;
        break;
    case MSR_MTRRcap:
        if (env->features[FEAT_1_EDX] & CPUID_MTRR) {
            val = MSR_MTRRcap_VCNT | MSR_MTRRcap_FIXRANGE_SUPPORT |
                MSR_MTRRcap_WC_SUPPORTED;
        } else {
            /* XXX: exception? */
            val = 0;
        }
        break;
    case MSR_MCG_CAP:
        val = env->mcg_cap;
        break;
    case MSR_MCG_CTL:
        if (env->mcg_cap & MCG_CTL_P) {
            val = env->mcg_ctl;
        } else {
            val = 0;
        }
        break;
    case MSR_MCG_STATUS:
        val = env->mcg_status;
        break;
    case MSR_IA32_MISC_ENABLE:
        val = env->msr_ia32_misc_enable;
        break;
    case MSR_IA32_BNDCFGS:
        val = env->msr_bndcfgs;
        break;
     case MSR_IA32_UCODE_REV:
        val = x86_cpu->ucode_rev;
        break;
    default:
        if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
            && (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +
            (4 * env->mcg_cap & 0xff)) {
            uint32_t offset = (uint32_t)env->regs[R_ECX] - MSR_MC0_CTL;
            val = env->mce_banks[offset];
            break;
        }
        /* XXX: exception? */
        val = 0;
        break;
    }
    env->regs[R_EAX] = (uint32_t)(val);
    env->regs[R_EDX] = (uint32_t)(val >> 32);
}

static void do_pause(X86CPU *cpu)
{
    CPUState *cs = CPU(cpu);

    /* Just let another CPU run.  */
    cs->exception_index = EXCP_INTERRUPT;
    cpu_loop_exit(cs);
}

static void do_hlt(X86CPU *cpu)
{
    CPUState *cs = CPU(cpu);
    CPUX86State *env = &cpu->env;

    env->hflags &= ~HF_INHIBIT_IRQ_MASK; /* needed if sti is just before */
    cs->halted = 1;
    cs->exception_index = EXCP_HLT;
    cpu_loop_exit(cs);
}

void helper_hlt(CPUX86State *env, int next_eip_addend)
{
    X86CPU *cpu = env_archcpu(env);

    cpu_svm_check_intercept_param(env, SVM_EXIT_HLT, 0, GETPC());
    env->eip += next_eip_addend;

    do_hlt(cpu);
}

void helper_monitor(CPUX86State *env, target_ulong ptr)
{
    if ((uint32_t)env->regs[R_ECX] != 0) {
        raise_exception_ra(env, EXCP0D_GPF, GETPC());
    }
    /* XXX: store address? */
    cpu_svm_check_intercept_param(env, SVM_EXIT_MONITOR, 0, GETPC());
}

void helper_mwait(CPUX86State *env, int next_eip_addend)
{
    CPUState *cs = env_cpu(env);
    X86CPU *cpu = env_archcpu(env);

    if ((uint32_t)env->regs[R_ECX] != 0) {
        raise_exception_ra(env, EXCP0D_GPF, GETPC());
    }

    cpu_svm_check_intercept_param(env, SVM_EXIT_MWAIT, 0, GETPC());
    env->eip += next_eip_addend;

    /* XXX: not complete but not completely erroneous */
    // if (cs->cpu_index != 0 || CPU_NEXT(cs) != NULL) { // TODO
    if (cs->cpu_index != 0) {
        // do_pause(cpu);
    } else {
        do_hlt(cpu);
    }
}

void helper_pause(CPUX86State *env, int next_eip_addend)
{
    X86CPU *cpu = env_archcpu(env);

    cpu_svm_check_intercept_param(env, SVM_EXIT_PAUSE, 0, GETPC());
    env->eip += next_eip_addend;

    do_pause(cpu);
}

void helper_debug(CPUX86State *env)
{
    CPUState *cs = env_cpu(env);

    cs->exception_index = EXCP_DEBUG;
    cpu_loop_exit(cs);
}

uint64_t helper_rdpkru(CPUX86State *env, uint32_t ecx)
{
    if ((env->cr[4] & CR4_PKE_MASK) == 0) {
        raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
    }
    if (ecx != 0) {
        raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
    }

    return env->pkru;
}

void helper_wrpkru(CPUX86State *env, uint32_t ecx, uint64_t val)
{
    CPUState *cs = env_cpu(env);

    if ((env->cr[4] & CR4_PKE_MASK) == 0) {
        raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC());
    }
    if (ecx != 0 || (val & 0xFFFFFFFF00000000ull)) {
        raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
    }

    env->pkru = val;
    tlb_flush(cs);
}