xref: /openbmc/qemu/target/arm/cpu.c (revision 8d92e26b452f8961ec90df3f93cf5f3b7a9d158f)

/*
 * QEMU ARM CPU
 *
 * Copyright (c) 2012 SUSE LINUX Products GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 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/gpl-2.0.html>
 */

#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "cpu.h"
#include "internals.h"
#include "qemu-common.h"
#include "exec/exec-all.h"
#include "hw/qdev-properties.h"
#if !defined(CONFIG_USER_ONLY)
#include "hw/loader.h"
#endif
#include "hw/arm/arm.h"
#include "sysemu/sysemu.h"
#include "sysemu/hw_accel.h"
#include "kvm_arm.h"

static void arm_cpu_set_pc(CPUState *cs, vaddr value)
{
    ARMCPU *cpu = ARM_CPU(cs);

    cpu->env.regs[15] = value;
}

static bool arm_cpu_has_work(CPUState *cs)
{
    ARMCPU *cpu = ARM_CPU(cs);

    return (cpu->power_state != PSCI_OFF)
        && cs->interrupt_request &
        (CPU_INTERRUPT_FIQ | CPU_INTERRUPT_HARD
         | CPU_INTERRUPT_VFIQ | CPU_INTERRUPT_VIRQ
         | CPU_INTERRUPT_EXITTB);
}

void arm_register_el_change_hook(ARMCPU *cpu, ARMELChangeHook *hook,
                                 void *opaque)
{
    /* We currently only support registering a single hook function */
    assert(!cpu->el_change_hook);
    cpu->el_change_hook = hook;
    cpu->el_change_hook_opaque = opaque;
}

static void cp_reg_reset(gpointer key, gpointer value, gpointer opaque)
{
    /* Reset a single ARMCPRegInfo register */
    ARMCPRegInfo *ri = value;
    ARMCPU *cpu = opaque;

    if (ri->type & (ARM_CP_SPECIAL | ARM_CP_ALIAS)) {
        return;
    }

    if (ri->resetfn) {
        ri->resetfn(&cpu->env, ri);
        return;
    }

    /* A zero offset is never possible as it would be regs[0]
     * so we use it to indicate that reset is being handled elsewhere.
     * This is basically only used for fields in non-core coprocessors
     * (like the pxa2xx ones).
     */
    if (!ri->fieldoffset) {
        return;
    }

    if (cpreg_field_is_64bit(ri)) {
        CPREG_FIELD64(&cpu->env, ri) = ri->resetvalue;
    } else {
        CPREG_FIELD32(&cpu->env, ri) = ri->resetvalue;
    }
}

static void cp_reg_check_reset(gpointer key, gpointer value,  gpointer opaque)
{
    /* Purely an assertion check: we've already done reset once,
     * so now check that running the reset for the cpreg doesn't
     * change its value. This traps bugs where two different cpregs
     * both try to reset the same state field but to different values.
     */
    ARMCPRegInfo *ri = value;
    ARMCPU *cpu = opaque;
    uint64_t oldvalue, newvalue;

    if (ri->type & (ARM_CP_SPECIAL | ARM_CP_ALIAS | ARM_CP_NO_RAW)) {
        return;
    }

    oldvalue = read_raw_cp_reg(&cpu->env, ri);
    cp_reg_reset(key, value, opaque);
    newvalue = read_raw_cp_reg(&cpu->env, ri);
    assert(oldvalue == newvalue);
}

/* CPUClass::reset() */
static void arm_cpu_reset(CPUState *s)
{
    ARMCPU *cpu = ARM_CPU(s);
    ARMCPUClass *acc = ARM_CPU_GET_CLASS(cpu);
    CPUARMState *env = &cpu->env;

    acc->parent_reset(s);

    memset(env, 0, offsetof(CPUARMState, end_reset_fields));

    g_hash_table_foreach(cpu->cp_regs, cp_reg_reset, cpu);
    g_hash_table_foreach(cpu->cp_regs, cp_reg_check_reset, cpu);

    env->vfp.xregs[ARM_VFP_FPSID] = cpu->reset_fpsid;
    env->vfp.xregs[ARM_VFP_MVFR0] = cpu->mvfr0;
    env->vfp.xregs[ARM_VFP_MVFR1] = cpu->mvfr1;
    env->vfp.xregs[ARM_VFP_MVFR2] = cpu->mvfr2;

    cpu->power_state = cpu->start_powered_off ? PSCI_OFF : PSCI_ON;
    s->halted = cpu->start_powered_off;

    if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
        env->iwmmxt.cregs[ARM_IWMMXT_wCID] = 0x69051000 | 'Q';
    }

    if (arm_feature(env, ARM_FEATURE_AARCH64)) {
        /* 64 bit CPUs always start in 64 bit mode */
        env->aarch64 = 1;
#if defined(CONFIG_USER_ONLY)
        env->pstate = PSTATE_MODE_EL0t;
        /* Userspace expects access to DC ZVA, CTL_EL0 and the cache ops */
        env->cp15.sctlr_el[1] |= SCTLR_UCT | SCTLR_UCI | SCTLR_DZE;
        /* and to the FP/Neon instructions */
        env->cp15.cpacr_el1 = deposit64(env->cp15.cpacr_el1, 20, 2, 3);
#else
        /* Reset into the highest available EL */
        if (arm_feature(env, ARM_FEATURE_EL3)) {
            env->pstate = PSTATE_MODE_EL3h;
        } else if (arm_feature(env, ARM_FEATURE_EL2)) {
            env->pstate = PSTATE_MODE_EL2h;
        } else {
            env->pstate = PSTATE_MODE_EL1h;
        }
        env->pc = cpu->rvbar;
#endif
    } else {
#if defined(CONFIG_USER_ONLY)
        /* Userspace expects access to cp10 and cp11 for FP/Neon */
        env->cp15.cpacr_el1 = deposit64(env->cp15.cpacr_el1, 20, 4, 0xf);
#endif
    }

#if defined(CONFIG_USER_ONLY)
    env->uncached_cpsr = ARM_CPU_MODE_USR;
    /* For user mode we must enable access to coprocessors */
    env->vfp.xregs[ARM_VFP_FPEXC] = 1 << 30;
    if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
        env->cp15.c15_cpar = 3;
    } else if (arm_feature(env, ARM_FEATURE_XSCALE)) {
        env->cp15.c15_cpar = 1;
    }
#else
    /* SVC mode with interrupts disabled.  */
    env->uncached_cpsr = ARM_CPU_MODE_SVC;
    env->daif = PSTATE_D | PSTATE_A | PSTATE_I | PSTATE_F;

    if (arm_feature(env, ARM_FEATURE_M)) {
        uint32_t initial_msp; /* Loaded from 0x0 */
        uint32_t initial_pc; /* Loaded from 0x4 */
        uint8_t *rom;

        /* For M profile we store FAULTMASK and PRIMASK in the
         * PSTATE F and I bits; these are both clear at reset.
         */
        env->daif &= ~(PSTATE_I | PSTATE_F);

        /* The reset value of this bit is IMPDEF, but ARM recommends
         * that it resets to 1, so QEMU always does that rather than making
         * it dependent on CPU model.
         */
        env->v7m.ccr = R_V7M_CCR_STKALIGN_MASK;

        /* Unlike A/R profile, M profile defines the reset LR value */
        env->regs[14] = 0xffffffff;

        /* Load the initial SP and PC from the vector table at address 0 */
        rom = rom_ptr(0);
        if (rom) {
            /* Address zero is covered by ROM which hasn't yet been
             * copied into physical memory.
             */
            initial_msp = ldl_p(rom);
            initial_pc = ldl_p(rom + 4);
        } else {
            /* Address zero not covered by a ROM blob, or the ROM blob
             * is in non-modifiable memory and this is a second reset after
             * it got copied into memory. In the latter case, rom_ptr
             * will return a NULL pointer and we should use ldl_phys instead.
             */
            initial_msp = ldl_phys(s->as, 0);
            initial_pc = ldl_phys(s->as, 4);
        }

        env->regs[13] = initial_msp & 0xFFFFFFFC;
        env->regs[15] = initial_pc & ~1;
        env->thumb = initial_pc & 1;
    }

    /* AArch32 has a hard highvec setting of 0xFFFF0000.  If we are currently
     * executing as AArch32 then check if highvecs are enabled and
     * adjust the PC accordingly.
     */
    if (A32_BANKED_CURRENT_REG_GET(env, sctlr) & SCTLR_V) {
        env->regs[15] = 0xFFFF0000;
    }

    env->vfp.xregs[ARM_VFP_FPEXC] = 0;
#endif
    set_flush_to_zero(1, &env->vfp.standard_fp_status);
    set_flush_inputs_to_zero(1, &env->vfp.standard_fp_status);
    set_default_nan_mode(1, &env->vfp.standard_fp_status);
    set_float_detect_tininess(float_tininess_before_rounding,
                              &env->vfp.fp_status);
    set_float_detect_tininess(float_tininess_before_rounding,
                              &env->vfp.standard_fp_status);
#ifndef CONFIG_USER_ONLY
    if (kvm_enabled()) {
        kvm_arm_reset_vcpu(cpu);
    }
#endif

    hw_breakpoint_update_all(cpu);
    hw_watchpoint_update_all(cpu);
}

bool arm_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
{
    CPUClass *cc = CPU_GET_CLASS(cs);
    CPUARMState *env = cs->env_ptr;
    uint32_t cur_el = arm_current_el(env);
    bool secure = arm_is_secure(env);
    uint32_t target_el;
    uint32_t excp_idx;
    bool ret = false;

    if (interrupt_request & CPU_INTERRUPT_FIQ) {
        excp_idx = EXCP_FIQ;
        target_el = arm_phys_excp_target_el(cs, excp_idx, cur_el, secure);
        if (arm_excp_unmasked(cs, excp_idx, target_el)) {
            cs->exception_index = excp_idx;
            env->exception.target_el = target_el;
            cc->do_interrupt(cs);
            ret = true;
        }
    }
    if (interrupt_request & CPU_INTERRUPT_HARD) {
        excp_idx = EXCP_IRQ;
        target_el = arm_phys_excp_target_el(cs, excp_idx, cur_el, secure);
        if (arm_excp_unmasked(cs, excp_idx, target_el)) {
            cs->exception_index = excp_idx;
            env->exception.target_el = target_el;
            cc->do_interrupt(cs);
            ret = true;
        }
    }
    if (interrupt_request & CPU_INTERRUPT_VIRQ) {
        excp_idx = EXCP_VIRQ;
        target_el = 1;
        if (arm_excp_unmasked(cs, excp_idx, target_el)) {
            cs->exception_index = excp_idx;
            env->exception.target_el = target_el;
            cc->do_interrupt(cs);
            ret = true;
        }
    }
    if (interrupt_request & CPU_INTERRUPT_VFIQ) {
        excp_idx = EXCP_VFIQ;
        target_el = 1;
        if (arm_excp_unmasked(cs, excp_idx, target_el)) {
            cs->exception_index = excp_idx;
            env->exception.target_el = target_el;
            cc->do_interrupt(cs);
            ret = true;
        }
    }

    return ret;
}

#if !defined(CONFIG_USER_ONLY) || !defined(TARGET_AARCH64)
static bool arm_v7m_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
{
    CPUClass *cc = CPU_GET_CLASS(cs);
    ARMCPU *cpu = ARM_CPU(cs);
    CPUARMState *env = &cpu->env;
    bool ret = false;

    /* ARMv7-M interrupt masking works differently than -A or -R.
     * There is no FIQ/IRQ distinction. Instead of I and F bits
     * masking FIQ and IRQ interrupts, an exception is taken only
     * if it is higher priority than the current execution priority
     * (which depends on state like BASEPRI, FAULTMASK and the
     * currently active exception).
     */
    if (interrupt_request & CPU_INTERRUPT_HARD
        && (armv7m_nvic_can_take_pending_exception(env->nvic))) {
        cs->exception_index = EXCP_IRQ;
        cc->do_interrupt(cs);
        ret = true;
    }
    return ret;
}
#endif

#ifndef CONFIG_USER_ONLY
static void arm_cpu_set_irq(void *opaque, int irq, int level)
{
    ARMCPU *cpu = opaque;
    CPUARMState *env = &cpu->env;
    CPUState *cs = CPU(cpu);
    static const int mask[] = {
        [ARM_CPU_IRQ] = CPU_INTERRUPT_HARD,
        [ARM_CPU_FIQ] = CPU_INTERRUPT_FIQ,
        [ARM_CPU_VIRQ] = CPU_INTERRUPT_VIRQ,
        [ARM_CPU_VFIQ] = CPU_INTERRUPT_VFIQ
    };

    switch (irq) {
    case ARM_CPU_VIRQ:
    case ARM_CPU_VFIQ:
        assert(arm_feature(env, ARM_FEATURE_EL2));
        /* fall through */
    case ARM_CPU_IRQ:
    case ARM_CPU_FIQ:
        if (level) {
            cpu_interrupt(cs, mask[irq]);
        } else {
            cpu_reset_interrupt(cs, mask[irq]);
        }
        break;
    default:
        g_assert_not_reached();
    }
}

static void arm_cpu_kvm_set_irq(void *opaque, int irq, int level)
{
#ifdef CONFIG_KVM
    ARMCPU *cpu = opaque;
    CPUState *cs = CPU(cpu);
    int kvm_irq = KVM_ARM_IRQ_TYPE_CPU << KVM_ARM_IRQ_TYPE_SHIFT;

    switch (irq) {
    case ARM_CPU_IRQ:
        kvm_irq |= KVM_ARM_IRQ_CPU_IRQ;
        break;
    case ARM_CPU_FIQ:
        kvm_irq |= KVM_ARM_IRQ_CPU_FIQ;
        break;
    default:
        g_assert_not_reached();
    }
    kvm_irq |= cs->cpu_index << KVM_ARM_IRQ_VCPU_SHIFT;
    kvm_set_irq(kvm_state, kvm_irq, level ? 1 : 0);
#endif
}

static bool arm_cpu_virtio_is_big_endian(CPUState *cs)
{
    ARMCPU *cpu = ARM_CPU(cs);
    CPUARMState *env = &cpu->env;

    cpu_synchronize_state(cs);
    return arm_cpu_data_is_big_endian(env);
}

#endif

static inline void set_feature(CPUARMState *env, int feature)
{
    env->features |= 1ULL << feature;
}

static inline void unset_feature(CPUARMState *env, int feature)
{
    env->features &= ~(1ULL << feature);
}

static int
print_insn_thumb1(bfd_vma pc, disassemble_info *info)
{
  return print_insn_arm(pc | 1, info);
}

static int arm_read_memory_func(bfd_vma memaddr, bfd_byte *b,
                                int length, struct disassemble_info *info)
{
    assert(info->read_memory_inner_func);
    assert((info->flags & INSN_ARM_BE32) == 0 || length == 2 || length == 4);

    if ((info->flags & INSN_ARM_BE32) != 0 && length == 2) {
        assert(info->endian == BFD_ENDIAN_LITTLE);
        return info->read_memory_inner_func(memaddr ^ 2, (bfd_byte *)b, 2,
                                            info);
    } else {
        return info->read_memory_inner_func(memaddr, b, length, info);
    }
}

static void arm_disas_set_info(CPUState *cpu, disassemble_info *info)
{
    ARMCPU *ac = ARM_CPU(cpu);
    CPUARMState *env = &ac->env;

    if (is_a64(env)) {
        /* We might not be compiled with the A64 disassembler
         * because it needs a C++ compiler. Leave print_insn
         * unset in this case to use the caller default behaviour.
         */
#if defined(CONFIG_ARM_A64_DIS)
        info->print_insn = print_insn_arm_a64;
#endif
    } else if (env->thumb) {
        info->print_insn = print_insn_thumb1;
    } else {
        info->print_insn = print_insn_arm;
    }
    if (bswap_code(arm_sctlr_b(env))) {
#ifdef TARGET_WORDS_BIGENDIAN
        info->endian = BFD_ENDIAN_LITTLE;
#else
        info->endian = BFD_ENDIAN_BIG;
#endif
    }
    if (info->read_memory_inner_func == NULL) {
        info->read_memory_inner_func = info->read_memory_func;
        info->read_memory_func = arm_read_memory_func;
    }
    info->flags &= ~INSN_ARM_BE32;
    if (arm_sctlr_b(env)) {
        info->flags |= INSN_ARM_BE32;
    }
}

uint64_t arm_cpu_mp_affinity(int idx, uint8_t clustersz)
{
    uint32_t Aff1 = idx / clustersz;
    uint32_t Aff0 = idx % clustersz;
    return (Aff1 << ARM_AFF1_SHIFT) | Aff0;
}

static void arm_cpu_initfn(Object *obj)
{
    CPUState *cs = CPU(obj);
    ARMCPU *cpu = ARM_CPU(obj);
    static bool inited;

    cs->env_ptr = &cpu->env;
    cpu->cp_regs = g_hash_table_new_full(g_int_hash, g_int_equal,
                                         g_free, g_free);

#ifndef CONFIG_USER_ONLY
    /* Our inbound IRQ and FIQ lines */
    if (kvm_enabled()) {
        /* VIRQ and VFIQ are unused with KVM but we add them to maintain
         * the same interface as non-KVM CPUs.
         */
        qdev_init_gpio_in(DEVICE(cpu), arm_cpu_kvm_set_irq, 4);
    } else {
        qdev_init_gpio_in(DEVICE(cpu), arm_cpu_set_irq, 4);
    }

    cpu->gt_timer[GTIMER_PHYS] = timer_new(QEMU_CLOCK_VIRTUAL, GTIMER_SCALE,
                                                arm_gt_ptimer_cb, cpu);
    cpu->gt_timer[GTIMER_VIRT] = timer_new(QEMU_CLOCK_VIRTUAL, GTIMER_SCALE,
                                                arm_gt_vtimer_cb, cpu);
    cpu->gt_timer[GTIMER_HYP] = timer_new(QEMU_CLOCK_VIRTUAL, GTIMER_SCALE,
                                                arm_gt_htimer_cb, cpu);
    cpu->gt_timer[GTIMER_SEC] = timer_new(QEMU_CLOCK_VIRTUAL, GTIMER_SCALE,
                                                arm_gt_stimer_cb, cpu);
    qdev_init_gpio_out(DEVICE(cpu), cpu->gt_timer_outputs,
                       ARRAY_SIZE(cpu->gt_timer_outputs));

    qdev_init_gpio_out_named(DEVICE(cpu), &cpu->gicv3_maintenance_interrupt,
                             "gicv3-maintenance-interrupt", 1);
#endif

    /* DTB consumers generally don't in fact care what the 'compatible'
     * string is, so always provide some string and trust that a hypothetical
     * picky DTB consumer will also provide a helpful error message.
     */
    cpu->dtb_compatible = "qemu,unknown";
    cpu->psci_version = 1; /* By default assume PSCI v0.1 */
    cpu->kvm_target = QEMU_KVM_ARM_TARGET_NONE;

    if (tcg_enabled()) {
        cpu->psci_version = 2; /* TCG implements PSCI 0.2 */
        if (!inited) {
            inited = true;
            arm_translate_init();
        }
    }
}

static Property arm_cpu_reset_cbar_property =
            DEFINE_PROP_UINT64("reset-cbar", ARMCPU, reset_cbar, 0);

static Property arm_cpu_reset_hivecs_property =
            DEFINE_PROP_BOOL("reset-hivecs", ARMCPU, reset_hivecs, false);

static Property arm_cpu_rvbar_property =
            DEFINE_PROP_UINT64("rvbar", ARMCPU, rvbar, 0);

static Property arm_cpu_has_el2_property =
            DEFINE_PROP_BOOL("has_el2", ARMCPU, has_el2, true);

static Property arm_cpu_has_el3_property =
            DEFINE_PROP_BOOL("has_el3", ARMCPU, has_el3, true);

static Property arm_cpu_cfgend_property =
            DEFINE_PROP_BOOL("cfgend", ARMCPU, cfgend, false);

/* use property name "pmu" to match other archs and virt tools */
static Property arm_cpu_has_pmu_property =
            DEFINE_PROP_BOOL("pmu", ARMCPU, has_pmu, true);

static Property arm_cpu_has_mpu_property =
            DEFINE_PROP_BOOL("has-mpu", ARMCPU, has_mpu, true);

/* This is like DEFINE_PROP_UINT32 but it doesn't set the default value,
 * because the CPU initfn will have already set cpu->pmsav7_dregion to
 * the right value for that particular CPU type, and we don't want
 * to override that with an incorrect constant value.
 */
static Property arm_cpu_pmsav7_dregion_property =
            DEFINE_PROP_UNSIGNED_NODEFAULT("pmsav7-dregion", ARMCPU,
                                           pmsav7_dregion,
                                           qdev_prop_uint32, uint32_t);

static void arm_cpu_post_init(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    /* M profile implies PMSA. We have to do this here rather than
     * in realize with the other feature-implication checks because
     * we look at the PMSA bit to see if we should add some properties.
     */
    if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
        set_feature(&cpu->env, ARM_FEATURE_PMSA);
    }

    if (arm_feature(&cpu->env, ARM_FEATURE_CBAR) ||
        arm_feature(&cpu->env, ARM_FEATURE_CBAR_RO)) {
        qdev_property_add_static(DEVICE(obj), &arm_cpu_reset_cbar_property,
                                 &error_abort);
    }

    if (!arm_feature(&cpu->env, ARM_FEATURE_M)) {
        qdev_property_add_static(DEVICE(obj), &arm_cpu_reset_hivecs_property,
                                 &error_abort);
    }

    if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
        qdev_property_add_static(DEVICE(obj), &arm_cpu_rvbar_property,
                                 &error_abort);
    }

    if (arm_feature(&cpu->env, ARM_FEATURE_EL3)) {
        /* Add the has_el3 state CPU property only if EL3 is allowed.  This will
         * prevent "has_el3" from existing on CPUs which cannot support EL3.
         */
        qdev_property_add_static(DEVICE(obj), &arm_cpu_has_el3_property,
                                 &error_abort);

#ifndef CONFIG_USER_ONLY
        object_property_add_link(obj, "secure-memory",
                                 TYPE_MEMORY_REGION,
                                 (Object **)&cpu->secure_memory,
                                 qdev_prop_allow_set_link_before_realize,
                                 OBJ_PROP_LINK_UNREF_ON_RELEASE,
                                 &error_abort);
#endif
    }

    if (arm_feature(&cpu->env, ARM_FEATURE_EL2)) {
        qdev_property_add_static(DEVICE(obj), &arm_cpu_has_el2_property,
                                 &error_abort);
    }

    if (arm_feature(&cpu->env, ARM_FEATURE_PMU)) {
        qdev_property_add_static(DEVICE(obj), &arm_cpu_has_pmu_property,
                                 &error_abort);
    }

    if (arm_feature(&cpu->env, ARM_FEATURE_PMSA)) {
        qdev_property_add_static(DEVICE(obj), &arm_cpu_has_mpu_property,
                                 &error_abort);
        if (arm_feature(&cpu->env, ARM_FEATURE_V7)) {
            qdev_property_add_static(DEVICE(obj),
                                     &arm_cpu_pmsav7_dregion_property,
                                     &error_abort);
        }
    }

    qdev_property_add_static(DEVICE(obj), &arm_cpu_cfgend_property,
                             &error_abort);
}

static void arm_cpu_finalizefn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);
    g_hash_table_destroy(cpu->cp_regs);
}

static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
{
    CPUState *cs = CPU(dev);
    ARMCPU *cpu = ARM_CPU(dev);
    ARMCPUClass *acc = ARM_CPU_GET_CLASS(dev);
    CPUARMState *env = &cpu->env;
    int pagebits;
    Error *local_err = NULL;

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

    /* Some features automatically imply others: */
    if (arm_feature(env, ARM_FEATURE_V8)) {
        set_feature(env, ARM_FEATURE_V7);
        set_feature(env, ARM_FEATURE_ARM_DIV);
        set_feature(env, ARM_FEATURE_LPAE);
    }
    if (arm_feature(env, ARM_FEATURE_V7)) {
        set_feature(env, ARM_FEATURE_VAPA);
        set_feature(env, ARM_FEATURE_THUMB2);
        set_feature(env, ARM_FEATURE_MPIDR);
        if (!arm_feature(env, ARM_FEATURE_M)) {
            set_feature(env, ARM_FEATURE_V6K);
        } else {
            set_feature(env, ARM_FEATURE_V6);
        }

        /* Always define VBAR for V7 CPUs even if it doesn't exist in
         * non-EL3 configs. This is needed by some legacy boards.
         */
        set_feature(env, ARM_FEATURE_VBAR);
    }
    if (arm_feature(env, ARM_FEATURE_V6K)) {
        set_feature(env, ARM_FEATURE_V6);
        set_feature(env, ARM_FEATURE_MVFR);
    }
    if (arm_feature(env, ARM_FEATURE_V6)) {
        set_feature(env, ARM_FEATURE_V5);
        if (!arm_feature(env, ARM_FEATURE_M)) {
            set_feature(env, ARM_FEATURE_AUXCR);
        }
    }
    if (arm_feature(env, ARM_FEATURE_V5)) {
        set_feature(env, ARM_FEATURE_V4T);
    }
    if (arm_feature(env, ARM_FEATURE_M)) {
        set_feature(env, ARM_FEATURE_THUMB_DIV);
    }
    if (arm_feature(env, ARM_FEATURE_ARM_DIV)) {
        set_feature(env, ARM_FEATURE_THUMB_DIV);
    }
    if (arm_feature(env, ARM_FEATURE_VFP4)) {
        set_feature(env, ARM_FEATURE_VFP3);
        set_feature(env, ARM_FEATURE_VFP_FP16);
    }
    if (arm_feature(env, ARM_FEATURE_VFP3)) {
        set_feature(env, ARM_FEATURE_VFP);
    }
    if (arm_feature(env, ARM_FEATURE_LPAE)) {
        set_feature(env, ARM_FEATURE_V7MP);
        set_feature(env, ARM_FEATURE_PXN);
    }
    if (arm_feature(env, ARM_FEATURE_CBAR_RO)) {
        set_feature(env, ARM_FEATURE_CBAR);
    }
    if (arm_feature(env, ARM_FEATURE_THUMB2) &&
        !arm_feature(env, ARM_FEATURE_M)) {
        set_feature(env, ARM_FEATURE_THUMB_DSP);
    }

    if (arm_feature(env, ARM_FEATURE_V7) &&
        !arm_feature(env, ARM_FEATURE_M) &&
        !arm_feature(env, ARM_FEATURE_PMSA)) {
        /* v7VMSA drops support for the old ARMv5 tiny pages, so we
         * can use 4K pages.
         */
        pagebits = 12;
    } else {
        /* For CPUs which might have tiny 1K pages, or which have an
         * MPU and might have small region sizes, stick with 1K pages.
         */
        pagebits = 10;
    }
    if (!set_preferred_target_page_bits(pagebits)) {
        /* This can only ever happen for hotplugging a CPU, or if
         * the board code incorrectly creates a CPU which it has
         * promised via minimum_page_size that it will not.
         */
        error_setg(errp, "This CPU requires a smaller page size than the "
                   "system is using");
        return;
    }

    /* This cpu-id-to-MPIDR affinity is used only for TCG; KVM will override it.
     * We don't support setting cluster ID ([16..23]) (known as Aff2
     * in later ARM ARM versions), or any of the higher affinity level fields,
     * so these bits always RAZ.
     */
    if (cpu->mp_affinity == ARM64_AFFINITY_INVALID) {
        cpu->mp_affinity = arm_cpu_mp_affinity(cs->cpu_index,
                                               ARM_DEFAULT_CPUS_PER_CLUSTER);
    }

    if (cpu->reset_hivecs) {
            cpu->reset_sctlr |= (1 << 13);
    }

    if (cpu->cfgend) {
        if (arm_feature(&cpu->env, ARM_FEATURE_V7)) {
            cpu->reset_sctlr |= SCTLR_EE;
        } else {
            cpu->reset_sctlr |= SCTLR_B;
        }
    }

    if (!cpu->has_el3) {
        /* If the has_el3 CPU property is disabled then we need to disable the
         * feature.
         */
        unset_feature(env, ARM_FEATURE_EL3);

        /* Disable the security extension feature bits in the processor feature
         * registers as well. These are id_pfr1[7:4] and id_aa64pfr0[15:12].
         */
        cpu->id_pfr1 &= ~0xf0;
        cpu->id_aa64pfr0 &= ~0xf000;
    }

    if (!cpu->has_el2) {
        unset_feature(env, ARM_FEATURE_EL2);
    }

    if (!cpu->has_pmu) {
        unset_feature(env, ARM_FEATURE_PMU);
        cpu->id_aa64dfr0 &= ~0xf00;
    }

    if (!arm_feature(env, ARM_FEATURE_EL2)) {
        /* Disable the hypervisor feature bits in the processor feature
         * registers if we don't have EL2. These are id_pfr1[15:12] and
         * id_aa64pfr0_el1[11:8].
         */
        cpu->id_aa64pfr0 &= ~0xf00;
        cpu->id_pfr1 &= ~0xf000;
    }

    /* MPU can be configured out of a PMSA CPU either by setting has-mpu
     * to false or by setting pmsav7-dregion to 0.
     */
    if (!cpu->has_mpu) {
        cpu->pmsav7_dregion = 0;
    }
    if (cpu->pmsav7_dregion == 0) {
        cpu->has_mpu = false;
    }

    if (arm_feature(env, ARM_FEATURE_PMSA) &&
        arm_feature(env, ARM_FEATURE_V7)) {
        uint32_t nr = cpu->pmsav7_dregion;

        if (nr > 0xff) {
            error_setg(errp, "PMSAv7 MPU #regions invalid %" PRIu32, nr);
            return;
        }

        if (nr) {
            env->pmsav7.drbar = g_new0(uint32_t, nr);
            env->pmsav7.drsr = g_new0(uint32_t, nr);
            env->pmsav7.dracr = g_new0(uint32_t, nr);
        }
    }

    if (arm_feature(env, ARM_FEATURE_EL3)) {
        set_feature(env, ARM_FEATURE_VBAR);
    }

    register_cp_regs_for_features(cpu);
    arm_cpu_register_gdb_regs_for_features(cpu);

    init_cpreg_list(cpu);

#ifndef CONFIG_USER_ONLY
    if (cpu->has_el3) {
        cs->num_ases = 2;
    } else {
        cs->num_ases = 1;
    }

    if (cpu->has_el3) {
        AddressSpace *as;

        if (!cpu->secure_memory) {
            cpu->secure_memory = cs->memory;
        }
        as = address_space_init_shareable(cpu->secure_memory,
                                          "cpu-secure-memory");
        cpu_address_space_init(cs, as, ARMASIdx_S);
    }
    cpu_address_space_init(cs,
                           address_space_init_shareable(cs->memory,
                                                        "cpu-memory"),
                           ARMASIdx_NS);
#endif

    qemu_init_vcpu(cs);
    cpu_reset(cs);

    acc->parent_realize(dev, errp);
}

static ObjectClass *arm_cpu_class_by_name(const char *cpu_model)
{
    ObjectClass *oc;
    char *typename;
    char **cpuname;

    if (!cpu_model) {
        return NULL;
    }

    cpuname = g_strsplit(cpu_model, ",", 1);
    typename = g_strdup_printf("%s-" TYPE_ARM_CPU, cpuname[0]);
    oc = object_class_by_name(typename);
    g_strfreev(cpuname);
    g_free(typename);
    if (!oc || !object_class_dynamic_cast(oc, TYPE_ARM_CPU) ||
        object_class_is_abstract(oc)) {
        return NULL;
    }
    return oc;
}

/* CPU models. These are not needed for the AArch64 linux-user build. */
#if !defined(CONFIG_USER_ONLY) || !defined(TARGET_AARCH64)

static void arm926_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,arm926";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_VFP);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    set_feature(&cpu->env, ARM_FEATURE_CACHE_TEST_CLEAN);
    cpu->midr = 0x41069265;
    cpu->reset_fpsid = 0x41011090;
    cpu->ctr = 0x1dd20d2;
    cpu->reset_sctlr = 0x00090078;
}

static void arm946_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,arm946";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_PMSA);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    cpu->midr = 0x41059461;
    cpu->ctr = 0x0f004006;
    cpu->reset_sctlr = 0x00000078;
}

static void arm1026_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,arm1026";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_VFP);
    set_feature(&cpu->env, ARM_FEATURE_AUXCR);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    set_feature(&cpu->env, ARM_FEATURE_CACHE_TEST_CLEAN);
    cpu->midr = 0x4106a262;
    cpu->reset_fpsid = 0x410110a0;
    cpu->ctr = 0x1dd20d2;
    cpu->reset_sctlr = 0x00090078;
    cpu->reset_auxcr = 1;
    {
        /* The 1026 had an IFAR at c6,c0,0,1 rather than the ARMv6 c6,c0,0,2 */
        ARMCPRegInfo ifar = {
            .name = "IFAR", .cp = 15, .crn = 6, .crm = 0, .opc1 = 0, .opc2 = 1,
            .access = PL1_RW,
            .fieldoffset = offsetof(CPUARMState, cp15.ifar_ns),
            .resetvalue = 0
        };
        define_one_arm_cp_reg(cpu, &ifar);
    }
}

static void arm1136_r2_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);
    /* What qemu calls "arm1136_r2" is actually the 1136 r0p2, ie an
     * older core than plain "arm1136". In particular this does not
     * have the v6K features.
     * These ID register values are correct for 1136 but may be wrong
     * for 1136_r2 (in particular r0p2 does not actually implement most
     * of the ID registers).
     */

    cpu->dtb_compatible = "arm,arm1136";
    set_feature(&cpu->env, ARM_FEATURE_V6);
    set_feature(&cpu->env, ARM_FEATURE_VFP);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    set_feature(&cpu->env, ARM_FEATURE_CACHE_DIRTY_REG);
    set_feature(&cpu->env, ARM_FEATURE_CACHE_BLOCK_OPS);
    cpu->midr = 0x4107b362;
    cpu->reset_fpsid = 0x410120b4;
    cpu->mvfr0 = 0x11111111;
    cpu->mvfr1 = 0x00000000;
    cpu->ctr = 0x1dd20d2;
    cpu->reset_sctlr = 0x00050078;
    cpu->id_pfr0 = 0x111;
    cpu->id_pfr1 = 0x1;
    cpu->id_dfr0 = 0x2;
    cpu->id_afr0 = 0x3;
    cpu->id_mmfr0 = 0x01130003;
    cpu->id_mmfr1 = 0x10030302;
    cpu->id_mmfr2 = 0x01222110;
    cpu->id_isar0 = 0x00140011;
    cpu->id_isar1 = 0x12002111;
    cpu->id_isar2 = 0x11231111;
    cpu->id_isar3 = 0x01102131;
    cpu->id_isar4 = 0x141;
    cpu->reset_auxcr = 7;
}

static void arm1136_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,arm1136";
    set_feature(&cpu->env, ARM_FEATURE_V6K);
    set_feature(&cpu->env, ARM_FEATURE_V6);
    set_feature(&cpu->env, ARM_FEATURE_VFP);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    set_feature(&cpu->env, ARM_FEATURE_CACHE_DIRTY_REG);
    set_feature(&cpu->env, ARM_FEATURE_CACHE_BLOCK_OPS);
    cpu->midr = 0x4117b363;
    cpu->reset_fpsid = 0x410120b4;
    cpu->mvfr0 = 0x11111111;
    cpu->mvfr1 = 0x00000000;
    cpu->ctr = 0x1dd20d2;
    cpu->reset_sctlr = 0x00050078;
    cpu->id_pfr0 = 0x111;
    cpu->id_pfr1 = 0x1;
    cpu->id_dfr0 = 0x2;
    cpu->id_afr0 = 0x3;
    cpu->id_mmfr0 = 0x01130003;
    cpu->id_mmfr1 = 0x10030302;
    cpu->id_mmfr2 = 0x01222110;
    cpu->id_isar0 = 0x00140011;
    cpu->id_isar1 = 0x12002111;
    cpu->id_isar2 = 0x11231111;
    cpu->id_isar3 = 0x01102131;
    cpu->id_isar4 = 0x141;
    cpu->reset_auxcr = 7;
}

static void arm1176_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,arm1176";
    set_feature(&cpu->env, ARM_FEATURE_V6K);
    set_feature(&cpu->env, ARM_FEATURE_VFP);
    set_feature(&cpu->env, ARM_FEATURE_VAPA);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    set_feature(&cpu->env, ARM_FEATURE_CACHE_DIRTY_REG);
    set_feature(&cpu->env, ARM_FEATURE_CACHE_BLOCK_OPS);
    set_feature(&cpu->env, ARM_FEATURE_EL3);
    cpu->midr = 0x410fb767;
    cpu->reset_fpsid = 0x410120b5;
    cpu->mvfr0 = 0x11111111;
    cpu->mvfr1 = 0x00000000;
    cpu->ctr = 0x1dd20d2;
    cpu->reset_sctlr = 0x00050078;
    cpu->id_pfr0 = 0x111;
    cpu->id_pfr1 = 0x11;
    cpu->id_dfr0 = 0x33;
    cpu->id_afr0 = 0;
    cpu->id_mmfr0 = 0x01130003;
    cpu->id_mmfr1 = 0x10030302;
    cpu->id_mmfr2 = 0x01222100;
    cpu->id_isar0 = 0x0140011;
    cpu->id_isar1 = 0x12002111;
    cpu->id_isar2 = 0x11231121;
    cpu->id_isar3 = 0x01102131;
    cpu->id_isar4 = 0x01141;
    cpu->reset_auxcr = 7;
}

static void arm11mpcore_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,arm11mpcore";
    set_feature(&cpu->env, ARM_FEATURE_V6K);
    set_feature(&cpu->env, ARM_FEATURE_VFP);
    set_feature(&cpu->env, ARM_FEATURE_VAPA);
    set_feature(&cpu->env, ARM_FEATURE_MPIDR);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    cpu->midr = 0x410fb022;
    cpu->reset_fpsid = 0x410120b4;
    cpu->mvfr0 = 0x11111111;
    cpu->mvfr1 = 0x00000000;
    cpu->ctr = 0x1d192992; /* 32K icache 32K dcache */
    cpu->id_pfr0 = 0x111;
    cpu->id_pfr1 = 0x1;
    cpu->id_dfr0 = 0;
    cpu->id_afr0 = 0x2;
    cpu->id_mmfr0 = 0x01100103;
    cpu->id_mmfr1 = 0x10020302;
    cpu->id_mmfr2 = 0x01222000;
    cpu->id_isar0 = 0x00100011;
    cpu->id_isar1 = 0x12002111;
    cpu->id_isar2 = 0x11221011;
    cpu->id_isar3 = 0x01102131;
    cpu->id_isar4 = 0x141;
    cpu->reset_auxcr = 1;
}

static void cortex_m3_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);
    set_feature(&cpu->env, ARM_FEATURE_V7);
    set_feature(&cpu->env, ARM_FEATURE_M);
    cpu->midr = 0x410fc231;
    cpu->pmsav7_dregion = 8;
}

static void cortex_m4_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    set_feature(&cpu->env, ARM_FEATURE_V7);
    set_feature(&cpu->env, ARM_FEATURE_M);
    set_feature(&cpu->env, ARM_FEATURE_THUMB_DSP);
    cpu->midr = 0x410fc240; /* r0p0 */
    cpu->pmsav7_dregion = 8;
}
static void arm_v7m_class_init(ObjectClass *oc, void *data)
{
    CPUClass *cc = CPU_CLASS(oc);

#ifndef CONFIG_USER_ONLY
    cc->do_interrupt = arm_v7m_cpu_do_interrupt;
#endif

    cc->cpu_exec_interrupt = arm_v7m_cpu_exec_interrupt;
}

static const ARMCPRegInfo cortexr5_cp_reginfo[] = {
    /* Dummy the TCM region regs for the moment */
    { .name = "ATCM", .cp = 15, .opc1 = 0, .crn = 9, .crm = 1, .opc2 = 0,
      .access = PL1_RW, .type = ARM_CP_CONST },
    { .name = "BTCM", .cp = 15, .opc1 = 0, .crn = 9, .crm = 1, .opc2 = 1,
      .access = PL1_RW, .type = ARM_CP_CONST },
    { .name = "DCACHE_INVAL", .cp = 15, .opc1 = 0, .crn = 15, .crm = 5,
      .opc2 = 0, .access = PL1_W, .type = ARM_CP_NOP },
    REGINFO_SENTINEL
};

static void cortex_r5_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    set_feature(&cpu->env, ARM_FEATURE_V7);
    set_feature(&cpu->env, ARM_FEATURE_THUMB_DIV);
    set_feature(&cpu->env, ARM_FEATURE_ARM_DIV);
    set_feature(&cpu->env, ARM_FEATURE_V7MP);
    set_feature(&cpu->env, ARM_FEATURE_PMSA);
    cpu->midr = 0x411fc153; /* r1p3 */
    cpu->id_pfr0 = 0x0131;
    cpu->id_pfr1 = 0x001;
    cpu->id_dfr0 = 0x010400;
    cpu->id_afr0 = 0x0;
    cpu->id_mmfr0 = 0x0210030;
    cpu->id_mmfr1 = 0x00000000;
    cpu->id_mmfr2 = 0x01200000;
    cpu->id_mmfr3 = 0x0211;
    cpu->id_isar0 = 0x2101111;
    cpu->id_isar1 = 0x13112111;
    cpu->id_isar2 = 0x21232141;
    cpu->id_isar3 = 0x01112131;
    cpu->id_isar4 = 0x0010142;
    cpu->id_isar5 = 0x0;
    cpu->mp_is_up = true;
    cpu->pmsav7_dregion = 16;
    define_arm_cp_regs(cpu, cortexr5_cp_reginfo);
}

static const ARMCPRegInfo cortexa8_cp_reginfo[] = {
    { .name = "L2LOCKDOWN", .cp = 15, .crn = 9, .crm = 0, .opc1 = 1, .opc2 = 0,
      .access = PL1_RW, .type = ARM_CP_CONST, .resetvalue = 0 },
    { .name = "L2AUXCR", .cp = 15, .crn = 9, .crm = 0, .opc1 = 1, .opc2 = 2,
      .access = PL1_RW, .type = ARM_CP_CONST, .resetvalue = 0 },
    REGINFO_SENTINEL
};

static void cortex_a8_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,cortex-a8";
    set_feature(&cpu->env, ARM_FEATURE_V7);
    set_feature(&cpu->env, ARM_FEATURE_VFP3);
    set_feature(&cpu->env, ARM_FEATURE_NEON);
    set_feature(&cpu->env, ARM_FEATURE_THUMB2EE);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    set_feature(&cpu->env, ARM_FEATURE_EL3);
    cpu->midr = 0x410fc080;
    cpu->reset_fpsid = 0x410330c0;
    cpu->mvfr0 = 0x11110222;
    cpu->mvfr1 = 0x00011111;
    cpu->ctr = 0x82048004;
    cpu->reset_sctlr = 0x00c50078;
    cpu->id_pfr0 = 0x1031;
    cpu->id_pfr1 = 0x11;
    cpu->id_dfr0 = 0x400;
    cpu->id_afr0 = 0;
    cpu->id_mmfr0 = 0x31100003;
    cpu->id_mmfr1 = 0x20000000;
    cpu->id_mmfr2 = 0x01202000;
    cpu->id_mmfr3 = 0x11;
    cpu->id_isar0 = 0x00101111;
    cpu->id_isar1 = 0x12112111;
    cpu->id_isar2 = 0x21232031;
    cpu->id_isar3 = 0x11112131;
    cpu->id_isar4 = 0x00111142;
    cpu->dbgdidr = 0x15141000;
    cpu->clidr = (1 << 27) | (2 << 24) | 3;
    cpu->ccsidr[0] = 0xe007e01a; /* 16k L1 dcache. */
    cpu->ccsidr[1] = 0x2007e01a; /* 16k L1 icache. */
    cpu->ccsidr[2] = 0xf0000000; /* No L2 icache. */
    cpu->reset_auxcr = 2;
    define_arm_cp_regs(cpu, cortexa8_cp_reginfo);
}

static const ARMCPRegInfo cortexa9_cp_reginfo[] = {
    /* power_control should be set to maximum latency. Again,
     * default to 0 and set by private hook
     */
    { .name = "A9_PWRCTL", .cp = 15, .crn = 15, .crm = 0, .opc1 = 0, .opc2 = 0,
      .access = PL1_RW, .resetvalue = 0,
      .fieldoffset = offsetof(CPUARMState, cp15.c15_power_control) },
    { .name = "A9_DIAG", .cp = 15, .crn = 15, .crm = 0, .opc1 = 0, .opc2 = 1,
      .access = PL1_RW, .resetvalue = 0,
      .fieldoffset = offsetof(CPUARMState, cp15.c15_diagnostic) },
    { .name = "A9_PWRDIAG", .cp = 15, .crn = 15, .crm = 0, .opc1 = 0, .opc2 = 2,
      .access = PL1_RW, .resetvalue = 0,
      .fieldoffset = offsetof(CPUARMState, cp15.c15_power_diagnostic) },
    { .name = "NEONBUSY", .cp = 15, .crn = 15, .crm = 1, .opc1 = 0, .opc2 = 0,
      .access = PL1_RW, .resetvalue = 0, .type = ARM_CP_CONST },
    /* TLB lockdown control */
    { .name = "TLB_LOCKR", .cp = 15, .crn = 15, .crm = 4, .opc1 = 5, .opc2 = 2,
      .access = PL1_W, .resetvalue = 0, .type = ARM_CP_NOP },
    { .name = "TLB_LOCKW", .cp = 15, .crn = 15, .crm = 4, .opc1 = 5, .opc2 = 4,
      .access = PL1_W, .resetvalue = 0, .type = ARM_CP_NOP },
    { .name = "TLB_VA", .cp = 15, .crn = 15, .crm = 5, .opc1 = 5, .opc2 = 2,
      .access = PL1_RW, .resetvalue = 0, .type = ARM_CP_CONST },
    { .name = "TLB_PA", .cp = 15, .crn = 15, .crm = 6, .opc1 = 5, .opc2 = 2,
      .access = PL1_RW, .resetvalue = 0, .type = ARM_CP_CONST },
    { .name = "TLB_ATTR", .cp = 15, .crn = 15, .crm = 7, .opc1 = 5, .opc2 = 2,
      .access = PL1_RW, .resetvalue = 0, .type = ARM_CP_CONST },
    REGINFO_SENTINEL
};

static void cortex_a9_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,cortex-a9";
    set_feature(&cpu->env, ARM_FEATURE_V7);
    set_feature(&cpu->env, ARM_FEATURE_VFP3);
    set_feature(&cpu->env, ARM_FEATURE_VFP_FP16);
    set_feature(&cpu->env, ARM_FEATURE_NEON);
    set_feature(&cpu->env, ARM_FEATURE_THUMB2EE);
    set_feature(&cpu->env, ARM_FEATURE_EL3);
    /* Note that A9 supports the MP extensions even for
     * A9UP and single-core A9MP (which are both different
     * and valid configurations; we don't model A9UP).
     */
    set_feature(&cpu->env, ARM_FEATURE_V7MP);
    set_feature(&cpu->env, ARM_FEATURE_CBAR);
    cpu->midr = 0x410fc090;
    cpu->reset_fpsid = 0x41033090;
    cpu->mvfr0 = 0x11110222;
    cpu->mvfr1 = 0x01111111;
    cpu->ctr = 0x80038003;
    cpu->reset_sctlr = 0x00c50078;
    cpu->id_pfr0 = 0x1031;
    cpu->id_pfr1 = 0x11;
    cpu->id_dfr0 = 0x000;
    cpu->id_afr0 = 0;
    cpu->id_mmfr0 = 0x00100103;
    cpu->id_mmfr1 = 0x20000000;
    cpu->id_mmfr2 = 0x01230000;
    cpu->id_mmfr3 = 0x00002111;
    cpu->id_isar0 = 0x00101111;
    cpu->id_isar1 = 0x13112111;
    cpu->id_isar2 = 0x21232041;
    cpu->id_isar3 = 0x11112131;
    cpu->id_isar4 = 0x00111142;
    cpu->dbgdidr = 0x35141000;
    cpu->clidr = (1 << 27) | (1 << 24) | 3;
    cpu->ccsidr[0] = 0xe00fe019; /* 16k L1 dcache. */
    cpu->ccsidr[1] = 0x200fe019; /* 16k L1 icache. */
    define_arm_cp_regs(cpu, cortexa9_cp_reginfo);
}

#ifndef CONFIG_USER_ONLY
static uint64_t a15_l2ctlr_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
    /* Linux wants the number of processors from here.
     * Might as well set the interrupt-controller bit too.
     */
    return ((smp_cpus - 1) << 24) | (1 << 23);
}
#endif

static const ARMCPRegInfo cortexa15_cp_reginfo[] = {
#ifndef CONFIG_USER_ONLY
    { .name = "L2CTLR", .cp = 15, .crn = 9, .crm = 0, .opc1 = 1, .opc2 = 2,
      .access = PL1_RW, .resetvalue = 0, .readfn = a15_l2ctlr_read,
      .writefn = arm_cp_write_ignore, },
#endif
    { .name = "L2ECTLR", .cp = 15, .crn = 9, .crm = 0, .opc1 = 1, .opc2 = 3,
      .access = PL1_RW, .type = ARM_CP_CONST, .resetvalue = 0 },
    REGINFO_SENTINEL
};

static void cortex_a7_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,cortex-a7";
    set_feature(&cpu->env, ARM_FEATURE_V7);
    set_feature(&cpu->env, ARM_FEATURE_VFP4);
    set_feature(&cpu->env, ARM_FEATURE_NEON);
    set_feature(&cpu->env, ARM_FEATURE_THUMB2EE);
    set_feature(&cpu->env, ARM_FEATURE_ARM_DIV);
    set_feature(&cpu->env, ARM_FEATURE_GENERIC_TIMER);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    set_feature(&cpu->env, ARM_FEATURE_CBAR_RO);
    set_feature(&cpu->env, ARM_FEATURE_LPAE);
    set_feature(&cpu->env, ARM_FEATURE_EL3);
    cpu->kvm_target = QEMU_KVM_ARM_TARGET_CORTEX_A7;
    cpu->midr = 0x410fc075;
    cpu->reset_fpsid = 0x41023075;
    cpu->mvfr0 = 0x10110222;
    cpu->mvfr1 = 0x11111111;
    cpu->ctr = 0x84448003;
    cpu->reset_sctlr = 0x00c50078;
    cpu->id_pfr0 = 0x00001131;
    cpu->id_pfr1 = 0x00011011;
    cpu->id_dfr0 = 0x02010555;
    cpu->pmceid0 = 0x00000000;
    cpu->pmceid1 = 0x00000000;
    cpu->id_afr0 = 0x00000000;
    cpu->id_mmfr0 = 0x10101105;
    cpu->id_mmfr1 = 0x40000000;
    cpu->id_mmfr2 = 0x01240000;
    cpu->id_mmfr3 = 0x02102211;
    cpu->id_isar0 = 0x01101110;
    cpu->id_isar1 = 0x13112111;
    cpu->id_isar2 = 0x21232041;
    cpu->id_isar3 = 0x11112131;
    cpu->id_isar4 = 0x10011142;
    cpu->dbgdidr = 0x3515f005;
    cpu->clidr = 0x0a200023;
    cpu->ccsidr[0] = 0x701fe00a; /* 32K L1 dcache */
    cpu->ccsidr[1] = 0x201fe00a; /* 32K L1 icache */
    cpu->ccsidr[2] = 0x711fe07a; /* 4096K L2 unified cache */
    define_arm_cp_regs(cpu, cortexa15_cp_reginfo); /* Same as A15 */
}

static void cortex_a15_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,cortex-a15";
    set_feature(&cpu->env, ARM_FEATURE_V7);
    set_feature(&cpu->env, ARM_FEATURE_VFP4);
    set_feature(&cpu->env, ARM_FEATURE_NEON);
    set_feature(&cpu->env, ARM_FEATURE_THUMB2EE);
    set_feature(&cpu->env, ARM_FEATURE_ARM_DIV);
    set_feature(&cpu->env, ARM_FEATURE_GENERIC_TIMER);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    set_feature(&cpu->env, ARM_FEATURE_CBAR_RO);
    set_feature(&cpu->env, ARM_FEATURE_LPAE);
    set_feature(&cpu->env, ARM_FEATURE_EL3);
    cpu->kvm_target = QEMU_KVM_ARM_TARGET_CORTEX_A15;
    cpu->midr = 0x412fc0f1;
    cpu->reset_fpsid = 0x410430f0;
    cpu->mvfr0 = 0x10110222;
    cpu->mvfr1 = 0x11111111;
    cpu->ctr = 0x8444c004;
    cpu->reset_sctlr = 0x00c50078;
    cpu->id_pfr0 = 0x00001131;
    cpu->id_pfr1 = 0x00011011;
    cpu->id_dfr0 = 0x02010555;
    cpu->pmceid0 = 0x0000000;
    cpu->pmceid1 = 0x00000000;
    cpu->id_afr0 = 0x00000000;
    cpu->id_mmfr0 = 0x10201105;
    cpu->id_mmfr1 = 0x20000000;
    cpu->id_mmfr2 = 0x01240000;
    cpu->id_mmfr3 = 0x02102211;
    cpu->id_isar0 = 0x02101110;
    cpu->id_isar1 = 0x13112111;
    cpu->id_isar2 = 0x21232041;
    cpu->id_isar3 = 0x11112131;
    cpu->id_isar4 = 0x10011142;
    cpu->dbgdidr = 0x3515f021;
    cpu->clidr = 0x0a200023;
    cpu->ccsidr[0] = 0x701fe00a; /* 32K L1 dcache */
    cpu->ccsidr[1] = 0x201fe00a; /* 32K L1 icache */
    cpu->ccsidr[2] = 0x711fe07a; /* 4096K L2 unified cache */
    define_arm_cp_regs(cpu, cortexa15_cp_reginfo);
}

static void ti925t_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);
    set_feature(&cpu->env, ARM_FEATURE_V4T);
    set_feature(&cpu->env, ARM_FEATURE_OMAPCP);
    cpu->midr = ARM_CPUID_TI925T;
    cpu->ctr = 0x5109149;
    cpu->reset_sctlr = 0x00000070;
}

static void sa1100_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "intel,sa1100";
    set_feature(&cpu->env, ARM_FEATURE_STRONGARM);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    cpu->midr = 0x4401A11B;
    cpu->reset_sctlr = 0x00000070;
}

static void sa1110_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);
    set_feature(&cpu->env, ARM_FEATURE_STRONGARM);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    cpu->midr = 0x6901B119;
    cpu->reset_sctlr = 0x00000070;
}

static void pxa250_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    cpu->midr = 0x69052100;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa255_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    cpu->midr = 0x69052d00;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa260_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    cpu->midr = 0x69052903;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa261_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    cpu->midr = 0x69052d05;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa262_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    cpu->midr = 0x69052d06;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa270a0_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    set_feature(&cpu->env, ARM_FEATURE_IWMMXT);
    cpu->midr = 0x69054110;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa270a1_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    set_feature(&cpu->env, ARM_FEATURE_IWMMXT);
    cpu->midr = 0x69054111;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa270b0_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    set_feature(&cpu->env, ARM_FEATURE_IWMMXT);
    cpu->midr = 0x69054112;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa270b1_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    set_feature(&cpu->env, ARM_FEATURE_IWMMXT);
    cpu->midr = 0x69054113;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa270c0_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    set_feature(&cpu->env, ARM_FEATURE_IWMMXT);
    cpu->midr = 0x69054114;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

static void pxa270c5_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "marvell,xscale";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_XSCALE);
    set_feature(&cpu->env, ARM_FEATURE_IWMMXT);
    cpu->midr = 0x69054117;
    cpu->ctr = 0xd172172;
    cpu->reset_sctlr = 0x00000078;
}

#ifdef CONFIG_USER_ONLY
static void arm_any_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);
    set_feature(&cpu->env, ARM_FEATURE_V8);
    set_feature(&cpu->env, ARM_FEATURE_VFP4);
    set_feature(&cpu->env, ARM_FEATURE_NEON);
    set_feature(&cpu->env, ARM_FEATURE_THUMB2EE);
    set_feature(&cpu->env, ARM_FEATURE_V8_AES);
    set_feature(&cpu->env, ARM_FEATURE_V8_SHA1);
    set_feature(&cpu->env, ARM_FEATURE_V8_SHA256);
    set_feature(&cpu->env, ARM_FEATURE_V8_PMULL);
    set_feature(&cpu->env, ARM_FEATURE_CRC);
    cpu->midr = 0xffffffff;
}
#endif

#endif /* !defined(CONFIG_USER_ONLY) || !defined(TARGET_AARCH64) */

typedef struct ARMCPUInfo {
    const char *name;
    void (*initfn)(Object *obj);
    void (*class_init)(ObjectClass *oc, void *data);
} ARMCPUInfo;

static const ARMCPUInfo arm_cpus[] = {
#if !defined(CONFIG_USER_ONLY) || !defined(TARGET_AARCH64)
    { .name = "arm926",      .initfn = arm926_initfn },
    { .name = "arm946",      .initfn = arm946_initfn },
    { .name = "arm1026",     .initfn = arm1026_initfn },
    /* What QEMU calls "arm1136-r2" is actually the 1136 r0p2, i.e. an
     * older core than plain "arm1136". In particular this does not
     * have the v6K features.
     */
    { .name = "arm1136-r2",  .initfn = arm1136_r2_initfn },
    { .name = "arm1136",     .initfn = arm1136_initfn },
    { .name = "arm1176",     .initfn = arm1176_initfn },
    { .name = "arm11mpcore", .initfn = arm11mpcore_initfn },
    { .name = "cortex-m3",   .initfn = cortex_m3_initfn,
                             .class_init = arm_v7m_class_init },
    { .name = "cortex-m4",   .initfn = cortex_m4_initfn,
                             .class_init = arm_v7m_class_init },
    { .name = "cortex-r5",   .initfn = cortex_r5_initfn },
    { .name = "cortex-a7",   .initfn = cortex_a7_initfn },
    { .name = "cortex-a8",   .initfn = cortex_a8_initfn },
    { .name = "cortex-a9",   .initfn = cortex_a9_initfn },
    { .name = "cortex-a15",  .initfn = cortex_a15_initfn },
    { .name = "ti925t",      .initfn = ti925t_initfn },
    { .name = "sa1100",      .initfn = sa1100_initfn },
    { .name = "sa1110",      .initfn = sa1110_initfn },
    { .name = "pxa250",      .initfn = pxa250_initfn },
    { .name = "pxa255",      .initfn = pxa255_initfn },
    { .name = "pxa260",      .initfn = pxa260_initfn },
    { .name = "pxa261",      .initfn = pxa261_initfn },
    { .name = "pxa262",      .initfn = pxa262_initfn },
    /* "pxa270" is an alias for "pxa270-a0" */
    { .name = "pxa270",      .initfn = pxa270a0_initfn },
    { .name = "pxa270-a0",   .initfn = pxa270a0_initfn },
    { .name = "pxa270-a1",   .initfn = pxa270a1_initfn },
    { .name = "pxa270-b0",   .initfn = pxa270b0_initfn },
    { .name = "pxa270-b1",   .initfn = pxa270b1_initfn },
    { .name = "pxa270-c0",   .initfn = pxa270c0_initfn },
    { .name = "pxa270-c5",   .initfn = pxa270c5_initfn },
#ifdef CONFIG_USER_ONLY
    { .name = "any",         .initfn = arm_any_initfn },
#endif
#endif
    { .name = NULL }
};

static Property arm_cpu_properties[] = {
    DEFINE_PROP_BOOL("start-powered-off", ARMCPU, start_powered_off, false),
    DEFINE_PROP_UINT32("psci-conduit", ARMCPU, psci_conduit, 0),
    DEFINE_PROP_UINT32("midr", ARMCPU, midr, 0),
    DEFINE_PROP_UINT64("mp-affinity", ARMCPU,
                        mp_affinity, ARM64_AFFINITY_INVALID),
    DEFINE_PROP_INT32("node-id", ARMCPU, node_id, CPU_UNSET_NUMA_NODE_ID),
    DEFINE_PROP_END_OF_LIST()
};

#ifdef CONFIG_USER_ONLY
static int arm_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
                                    int mmu_idx)
{
    ARMCPU *cpu = ARM_CPU(cs);
    CPUARMState *env = &cpu->env;

    env->exception.vaddress = address;
    if (rw == 2) {
        cs->exception_index = EXCP_PREFETCH_ABORT;
    } else {
        cs->exception_index = EXCP_DATA_ABORT;
    }
    return 1;
}
#endif

static gchar *arm_gdb_arch_name(CPUState *cs)
{
    ARMCPU *cpu = ARM_CPU(cs);
    CPUARMState *env = &cpu->env;

    if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
        return g_strdup("iwmmxt");
    }
    return g_strdup("arm");
}

static void arm_cpu_class_init(ObjectClass *oc, void *data)
{
    ARMCPUClass *acc = ARM_CPU_CLASS(oc);
    CPUClass *cc = CPU_CLASS(acc);
    DeviceClass *dc = DEVICE_CLASS(oc);

    acc->parent_realize = dc->realize;
    dc->realize = arm_cpu_realizefn;
    dc->props = arm_cpu_properties;

    acc->parent_reset = cc->reset;
    cc->reset = arm_cpu_reset;

    cc->class_by_name = arm_cpu_class_by_name;
    cc->has_work = arm_cpu_has_work;
    cc->cpu_exec_interrupt = arm_cpu_exec_interrupt;
    cc->dump_state = arm_cpu_dump_state;
    cc->set_pc = arm_cpu_set_pc;
    cc->gdb_read_register = arm_cpu_gdb_read_register;
    cc->gdb_write_register = arm_cpu_gdb_write_register;
#ifdef CONFIG_USER_ONLY
    cc->handle_mmu_fault = arm_cpu_handle_mmu_fault;
#else
    cc->do_interrupt = arm_cpu_do_interrupt;
    cc->do_unaligned_access = arm_cpu_do_unaligned_access;
    cc->get_phys_page_attrs_debug = arm_cpu_get_phys_page_attrs_debug;
    cc->asidx_from_attrs = arm_asidx_from_attrs;
    cc->vmsd = &vmstate_arm_cpu;
    cc->virtio_is_big_endian = arm_cpu_virtio_is_big_endian;
    cc->write_elf64_note = arm_cpu_write_elf64_note;
    cc->write_elf32_note = arm_cpu_write_elf32_note;
#endif
    cc->gdb_num_core_regs = 26;
    cc->gdb_core_xml_file = "arm-core.xml";
    cc->gdb_arch_name = arm_gdb_arch_name;
    cc->gdb_stop_before_watchpoint = true;
    cc->debug_excp_handler = arm_debug_excp_handler;
    cc->debug_check_watchpoint = arm_debug_check_watchpoint;
#if !defined(CONFIG_USER_ONLY)
    cc->adjust_watchpoint_address = arm_adjust_watchpoint_address;
#endif

    cc->disas_set_info = arm_disas_set_info;
}

static void cpu_register(const ARMCPUInfo *info)
{
    TypeInfo type_info = {
        .parent = TYPE_ARM_CPU,
        .instance_size = sizeof(ARMCPU),
        .instance_init = info->initfn,
        .class_size = sizeof(ARMCPUClass),
        .class_init = info->class_init,
    };

    type_info.name = g_strdup_printf("%s-" TYPE_ARM_CPU, info->name);
    type_register(&type_info);
    g_free((void *)type_info.name);
}

static const TypeInfo arm_cpu_type_info = {
    .name = TYPE_ARM_CPU,
    .parent = TYPE_CPU,
    .instance_size = sizeof(ARMCPU),
    .instance_init = arm_cpu_initfn,
    .instance_post_init = arm_cpu_post_init,
    .instance_finalize = arm_cpu_finalizefn,
    .abstract = true,
    .class_size = sizeof(ARMCPUClass),
    .class_init = arm_cpu_class_init,
};

static void arm_cpu_register_types(void)
{
    const ARMCPUInfo *info = arm_cpus;

    type_register_static(&arm_cpu_type_info);

    while (info->name) {
        cpu_register(info);
        info++;
    }
}

type_init(arm_cpu_register_types)