io/apix/apix.c

	apix.c revision 7417cfdecea1902cef03c0d61a72df97d945925d
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * Copyright (c) 2010, Intel Corporation.
 * All rights reserved.
 */

/*
 * PSMI 1.1 extensions are supported only in 2.6 and later versions.
 * PSMI 1.2 extensions are supported only in 2.7 and later versions.
 * PSMI 1.3 and 1.4 extensions are supported in Solaris 10.
 * PSMI 1.5 extensions are supported in Solaris Nevada.
 * PSMI 1.6 extensions are supported in Solaris Nevada.
 * PSMI 1.7 extensions are supported in Solaris Nevada.
 */
#define PSMI_1_7

#include <sys/processor.h>
#include <sys/time.h>
#include <sys/psm.h>
#include <sys/smp_impldefs.h>
#include <sys/cram.h>
#include <sys/acpi/acpi.h>
#include <sys/acpica.h>
#include <sys/psm_common.h>
#include <sys/pit.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/ddi_impldefs.h>
#include <sys/pci.h>
#include <sys/promif.h>
#include <sys/x86_archext.h>
#include <sys/cpc_impl.h>
#include <sys/uadmin.h>
#include <sys/panic.h>
#include <sys/debug.h>
#include <sys/archsystm.h>
#include <sys/trap.h>
#include <sys/machsystm.h>
#include <sys/sysmacros.h>
#include <sys/cpuvar.h>
#include <sys/rm_platter.h>
#include <sys/privregs.h>
#include <sys/note.h>
#include <sys/pci_intr_lib.h>
#include <sys/spl.h>
#include <sys/clock.h>
#include <sys/dditypes.h>
#include <sys/sunddi.h>
#include <sys/x_call.h>
#include <sys/reboot.h>
#include <sys/mach_intr.h>
#include <sys/apix.h>
#include <sys/apix_irm_impl.h>

static int apix_probe();
static void apix_init();
static void apix_picinit(void);
static int apix_intr_enter(int, int *);
static void apix_intr_exit(int, int);
static void apix_setspl(int);
static int apix_disable_intr(processorid_t);
static void apix_enable_intr(processorid_t);
static int apix_get_clkvect(int);
static int apix_get_ipivect(int, int);
static void apix_post_cyclic_setup(void *);
static int apix_post_cpu_start();
static int apix_intr_ops(dev_info_t *, ddi_intr_handle_impl_t *,
    psm_intr_op_t, int *);

/*
 * Helper functions for apix_intr_ops()
 */
static void apix_redistribute_compute(void);
static int apix_get_pending(apix_vector_t *);
static apix_vector_t *apix_get_req_vector(ddi_intr_handle_impl_t *, ushort_t);
static int apix_get_intr_info(ddi_intr_handle_impl_t *, apic_get_intr_t *);
static char *apix_get_apic_type(void);
static int apix_intx_get_pending(int);
static void apix_intx_set_mask(int irqno);
static void apix_intx_clear_mask(int irqno);
static int apix_intx_get_shared(int irqno);
static void apix_intx_set_shared(int irqno, int delta);
static apix_vector_t *apix_intx_xlate_vector(dev_info_t *, int,
    struct intrspec *);
static int apix_intx_alloc_vector(dev_info_t *, int, struct intrspec *);

extern int apic_clkinit(int);

/* IRM initialization for APIX PSM module */
extern void apix_irm_init(void);

extern int irm_enable;

/*
 *  Local static data
 */
static struct   psm_ops apix_ops = {
    apix_probe,

    apix_init,
    apix_picinit,
    apix_intr_enter,
    apix_intr_exit,
    apix_setspl,
    apix_addspl,
    apix_delspl,
    apix_disable_intr,
    apix_enable_intr,
    NULL,           /* psm_softlvl_to_irq */
    NULL,           /* psm_set_softintr */

    apic_set_idlecpu,
    apic_unset_idlecpu,

    apic_clkinit,
    apix_get_clkvect,
    NULL,           /* psm_hrtimeinit */
    apic_gethrtime,

    apic_get_next_processorid,
    apic_cpu_start,
    apix_post_cpu_start,
    apic_shutdown,
    apix_get_ipivect,
    apic_send_ipi,

    NULL,           /* psm_translate_irq */
    NULL,           /* psm_notify_error */
    NULL,           /* psm_notify_func */
    apic_timer_reprogram,
    apic_timer_enable,
    apic_timer_disable,
    apix_post_cyclic_setup,
    apic_preshutdown,
    apix_intr_ops,      /* Advanced DDI Interrupt framework */
    apic_state,     /* save, restore apic state for S3 */
    apic_cpu_ops,       /* CPU control interface. */
};

struct psm_ops *psmops = &apix_ops;

static struct   psm_info apix_psm_info = {
    PSM_INFO_VER01_7,           /* version */
    PSM_OWN_EXCLUSIVE,          /* ownership */
    &apix_ops,              /* operation */
    APIX_NAME,              /* machine name */
    "apix MPv1.4 compatible",
};

static void *apix_hdlp;

static int apix_is_enabled = 0;

/*
 * Flag to indicate if APIX is to be enabled only for platforms
 * with specific hw feature(s).
 */
int apix_hw_chk_enable = 1;

/*
 * Hw features that are checked for enabling APIX support.
 */
#define APIX_SUPPORT_X2APIC 0x00000001
uint_t apix_supported_hw = APIX_SUPPORT_X2APIC;

/*
 * apix_lock is used for cpu selection and vector re-binding
 */
lock_t apix_lock;
apix_impl_t *apixs[NCPU];
/*
 * Mapping between device interrupt and the allocated vector. Indexed
 * by major number.
 */
apix_dev_vector_t **apix_dev_vector;
/*
 * Mapping between device major number and cpu id. It gets used
 * when interrupt binding policy round robin with affinity is
 * applied. With that policy, devices with the same major number
 * will be bound to the same CPU.
 */
processorid_t *apix_major_to_cpu;   /* major to cpu mapping */
kmutex_t apix_mutex;    /* for apix_dev_vector & apix_major_to_cpu */

int apix_nipis = 16;    /* Maximum number of IPIs */
/*
 * Maximum number of vectors in a CPU that can be used for interrupt
 * allocation (including IPIs and the reserved vectors).
 */
int apix_cpu_nvectors = APIX_NVECTOR;

/* gcpu.h */

extern void apic_do_interrupt(struct regs *rp, trap_trace_rec_t *ttp);
extern void apic_change_eoi();

/*
 *  This is the loadable module wrapper
 */

int
_init(void)
{
    if (apic_coarse_hrtime)
        apix_ops.psm_gethrtime = &apic_gettime;
    return (psm_mod_init(&apix_hdlp, &apix_psm_info));
}

int
_fini(void)
{
    return (psm_mod_fini(&apix_hdlp, &apix_psm_info));
}

int
_info(struct modinfo *modinfop)
{
    return (psm_mod_info(&apix_hdlp, &apix_psm_info, modinfop));
}

static int
apix_probe()
{
    int rval;

    if (apix_enable == 0)
        return (PSM_FAILURE);

    /* check for hw features if specified  */
    if (apix_hw_chk_enable) {
        /* check if x2APIC mode is supported */
        if ((apix_supported_hw & APIX_SUPPORT_X2APIC) ==
            APIX_SUPPORT_X2APIC) {
            if (!((apic_local_mode() == LOCAL_X2APIC) ||
                apic_detect_x2apic())) {
                /* x2APIC mode is not supported in the hw */
                apix_enable = 0;
            }
        }
        if (apix_enable == 0)
            return (PSM_FAILURE);
    }

    rval = apic_probe_common(apix_psm_info.p_mach_idstring);
    if (rval == PSM_SUCCESS)
        apix_is_enabled = 1;
    else
        apix_is_enabled = 0;
    return (rval);
}

/*
 * Initialize the data structures needed by pcplusmpx module.
 * Specifically, the data structures used by addspl() and delspl()
 * routines.
 */
static void
apix_softinit()
{
    int i, *iptr;
    apix_impl_t *hdlp;
    int nproc;

    nproc = max(apic_nproc, apic_max_nproc);

    hdlp = kmem_zalloc(nproc * sizeof (apix_impl_t), KM_SLEEP);
    for (i = 0; i < nproc; i++) {
        apixs[i] = &hdlp[i];
        apixs[i]->x_cpuid = i;
        LOCK_INIT_CLEAR(&apixs[i]->x_lock);
    }

    /* cpu 0 is always up (for now) */
    apic_cpus[0].aci_status = APIC_CPU_ONLINE | APIC_CPU_INTR_ENABLE;

    iptr = (int *)&apic_irq_table[0];
    for (i = 0; i <= APIC_MAX_VECTOR; i++) {
        apic_level_intr[i] = 0;
        *iptr++ = NULL;
    }
    mutex_init(&airq_mutex, NULL, MUTEX_DEFAULT, NULL);

    apix_dev_vector = kmem_zalloc(sizeof (apix_dev_vector_t *) * devcnt,
        KM_SLEEP);

    if (apic_intr_policy == INTR_ROUND_ROBIN_WITH_AFFINITY) {
        apix_major_to_cpu = kmem_zalloc(sizeof (int) * devcnt,
            KM_SLEEP);
        for (i = 0; i < devcnt; i++)
            apix_major_to_cpu[i] = IRQ_UNINIT;
    }

    mutex_init(&apix_mutex, NULL, MUTEX_DEFAULT, NULL);
}

static int
apix_get_pending_spl(void)
{
    int cpuid = CPU->cpu_id;

    return (bsrw_insn(apixs[cpuid]->x_intr_pending));
}

static uintptr_t
apix_get_intr_handler(int cpu, short vec)
{
    apix_vector_t *apix_vector;

    ASSERT(cpu < apic_nproc && vec < APIX_NVECTOR);
    if (cpu >= apic_nproc)
        return (NULL);

    apix_vector = apixs[cpu]->x_vectbl[vec];

    return ((uintptr_t)(apix_vector->v_autovect));
}

#if defined(__amd64)
static unsigned char dummy_cpu_pri[MAXIPL + 1] = {
    0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0
};
#endif

static void
apix_init()
{
    extern void (*do_interrupt_common)(struct regs *, trap_trace_rec_t *);

    APIC_VERBOSE(INIT, (CE_CONT, "apix: psm_softinit\n"));

    do_interrupt_common = apix_do_interrupt;
    addintr = apix_add_avintr;
    remintr = apix_rem_avintr;
    get_pending_spl = apix_get_pending_spl;
    get_intr_handler = apix_get_intr_handler;
    psm_get_localapicid = apic_get_localapicid;
    psm_get_ioapicid = apic_get_ioapicid;

    apix_softinit();
#if defined(__amd64)
    /*
     * Make cpu-specific interrupt info point to cr8pri vector
     */
    CPU->cpu_pri_data = dummy_cpu_pri;
#else
    if (cpuid_have_cr8access(CPU))
        apic_have_32bit_cr8 = 1;
#endif  /* __amd64 */

    /*
     * Initialize IRM pool parameters
     */
    if (irm_enable) {
        int i;
        int lowest_irq;
        int highest_irq;

        /* number of CPUs present */
        apix_irminfo.apix_ncpus = apic_nproc;
        /* total number of entries in all of the IOAPICs present */
        lowest_irq = apic_io_vectbase[0];
        highest_irq = apic_io_vectend[0];
        for (i = 1; i < apic_io_max; i++) {
            if (apic_io_vectbase[i] < lowest_irq)
                lowest_irq = apic_io_vectbase[i];
            if (apic_io_vectend[i] > highest_irq)
                highest_irq = apic_io_vectend[i];
        }
        apix_irminfo.apix_ioapic_max_vectors =
            highest_irq - lowest_irq + 1;
        /*
         * Number of available per-CPU vectors excluding
         * reserved vectors for Dtrace, int80, system-call,
         * fast-trap, etc.
         */
        apix_irminfo.apix_per_cpu_vectors = APIX_NAVINTR -
            APIX_SW_RESERVED_VECTORS;

        /* Number of vectors (pre) allocated (SCI and HPET) */
        apix_irminfo.apix_vectors_allocated = 0;
        if (apic_hpet_vect != -1)
            apix_irminfo.apix_vectors_allocated++;
        if (apic_sci_vect != -1)
            apix_irminfo.apix_vectors_allocated++;
    }
}

static void
apix_init_intr()
{
    processorid_t   cpun = psm_get_cpu_id();
    uint_t nlvt;
    uint32_t svr = AV_UNIT_ENABLE | APIC_SPUR_INTR;
    extern void cmi_cmci_trap(void);

    apic_reg_ops->apic_write_task_reg(APIC_MASK_ALL);

    if (apic_mode == LOCAL_APIC) {
        /*
         * We are running APIC in MMIO mode.
         */
        if (apic_flat_model) {
            apic_reg_ops->apic_write(APIC_FORMAT_REG,
                APIC_FLAT_MODEL);
        } else {
            apic_reg_ops->apic_write(APIC_FORMAT_REG,
                APIC_CLUSTER_MODEL);
        }

        apic_reg_ops->apic_write(APIC_DEST_REG,
            AV_HIGH_ORDER >> cpun);
    }

    if (apic_directed_EOI_supported()) {
        /*
         * Setting the 12th bit in the Spurious Interrupt Vector
         * Register suppresses broadcast EOIs generated by the local
         * APIC. The suppression of broadcast EOIs happens only when
         * interrupts are level-triggered.
         */
        svr |= APIC_SVR_SUPPRESS_BROADCAST_EOI;
    }

    /* need to enable APIC before unmasking NMI */
    apic_reg_ops->apic_write(APIC_SPUR_INT_REG, svr);

    /*
     * Presence of an invalid vector with delivery mode AV_FIXED can
     * cause an error interrupt, even if the entry is masked...so
     * write a valid vector to LVT entries along with the mask bit
     */

    /* All APICs have timer and LINT0/1 */
    apic_reg_ops->apic_write(APIC_LOCAL_TIMER, AV_MASK|APIC_RESV_IRQ);
    apic_reg_ops->apic_write(APIC_INT_VECT0, AV_MASK|APIC_RESV_IRQ);
    apic_reg_ops->apic_write(APIC_INT_VECT1, AV_NMI);   /* enable NMI */

    /*
     * On integrated APICs, the number of LVT entries is
     * 'Max LVT entry' + 1; on 82489DX's (non-integrated
     * APICs), nlvt is "3" (LINT0, LINT1, and timer)
     */

    if (apic_cpus[cpun].aci_local_ver < APIC_INTEGRATED_VERS) {
        nlvt = 3;
    } else {
        nlvt = ((apic_reg_ops->apic_read(APIC_VERS_REG) >> 16) &
            0xFF) + 1;
    }

    if (nlvt >= 5) {
        /* Enable performance counter overflow interrupt */

        if (!is_x86_feature(x86_featureset, X86FSET_MSR))
            apic_enable_cpcovf_intr = 0;
        if (apic_enable_cpcovf_intr) {
            if (apic_cpcovf_vect == 0) {
                int ipl = APIC_PCINT_IPL;

                apic_cpcovf_vect = apix_get_ipivect(ipl, -1);
                ASSERT(apic_cpcovf_vect);

                (void) add_avintr(NULL, ipl,
                    (avfunc)kcpc_hw_overflow_intr,
                    "apic pcint", apic_cpcovf_vect,
                    NULL, NULL, NULL, NULL);
                kcpc_hw_overflow_intr_installed = 1;
                kcpc_hw_enable_cpc_intr =
                    apic_cpcovf_mask_clear;
            }
            apic_reg_ops->apic_write(APIC_PCINT_VECT,
                apic_cpcovf_vect);
        }
    }

    if (nlvt >= 6) {
        /* Only mask TM intr if the BIOS apparently doesn't use it */

        uint32_t lvtval;

        lvtval = apic_reg_ops->apic_read(APIC_THERM_VECT);
        if (((lvtval & AV_MASK) == AV_MASK) ||
            ((lvtval & AV_DELIV_MODE) != AV_SMI)) {
            apic_reg_ops->apic_write(APIC_THERM_VECT,
                AV_MASK|APIC_RESV_IRQ);
        }
    }

    /* Enable error interrupt */

    if (nlvt >= 4 && apic_enable_error_intr) {
        if (apic_errvect == 0) {
            int ipl = 0xf;  /* get highest priority intr */
            apic_errvect = apix_get_ipivect(ipl, -1);
            ASSERT(apic_errvect);
            /*
             * Not PSMI compliant, but we are going to merge
             * with ON anyway
             */
            (void) add_avintr(NULL, ipl,
                (avfunc)apic_error_intr, "apic error intr",
                apic_errvect, NULL, NULL, NULL, NULL);
        }
        apic_reg_ops->apic_write(APIC_ERR_VECT, apic_errvect);
        apic_reg_ops->apic_write(APIC_ERROR_STATUS, 0);
        apic_reg_ops->apic_write(APIC_ERROR_STATUS, 0);
    }

    /* Enable CMCI interrupt */
    if (cmi_enable_cmci) {
        mutex_enter(&cmci_cpu_setup_lock);
        if (cmci_cpu_setup_registered == 0) {
            mutex_enter(&cpu_lock);
            register_cpu_setup_func(cmci_cpu_setup, NULL);
            mutex_exit(&cpu_lock);
            cmci_cpu_setup_registered = 1;
        }
        mutex_exit(&cmci_cpu_setup_lock);

        if (apic_cmci_vect == 0) {
            int ipl = 0x2;
            apic_cmci_vect = apix_get_ipivect(ipl, -1);
            ASSERT(apic_cmci_vect);

            (void) add_avintr(NULL, ipl,
                (avfunc)cmi_cmci_trap, "apic cmci intr",
                apic_cmci_vect, NULL, NULL, NULL, NULL);
        }
        apic_reg_ops->apic_write(APIC_CMCI_VECT, apic_cmci_vect);
    }

    apic_reg_ops->apic_write_task_reg(0);
}

static void
apix_picinit(void)
{
    int i, j;
    uint_t isr;

    APIC_VERBOSE(INIT, (CE_CONT, "apix: psm_picinit\n"));

    /*
     * initialize interrupt remapping before apic
     * hardware initialization
     */
    apic_intrmap_init(apic_mode);
    if (apic_vt_ops == psm_vt_ops)
        apix_mul_ioapic_method = APIC_MUL_IOAPIC_IIR;

    /*
     * On UniSys Model 6520, the BIOS leaves vector 0x20 isr
     * bit on without clearing it with EOI.  Since softint
     * uses vector 0x20 to interrupt itself, so softint will
     * not work on this machine.  In order to fix this problem
     * a check is made to verify all the isr bits are clear.
     * If not, EOIs are issued to clear the bits.
     */
    for (i = 7; i >= 1; i--) {
        isr = apic_reg_ops->apic_read(APIC_ISR_REG + (i * 4));
        if (isr != 0)
            for (j = 0; ((j < 32) && (isr != 0)); j++)
                if (isr & (1 << j)) {
                    apic_reg_ops->apic_write(
                        APIC_EOI_REG, 0);
                    isr &= ~(1 << j);
                    apic_error |= APIC_ERR_BOOT_EOI;
                }
    }

    /* set a flag so we know we have run apic_picinit() */
    apic_picinit_called = 1;
    LOCK_INIT_CLEAR(&apic_gethrtime_lock);
    LOCK_INIT_CLEAR(&apic_ioapic_lock);
    LOCK_INIT_CLEAR(&apic_error_lock);
    LOCK_INIT_CLEAR(&apic_mode_switch_lock);

    picsetup();  /* initialise the 8259 */

    /* add nmi handler - least priority nmi handler */
    LOCK_INIT_CLEAR(&apic_nmi_lock);

    if (!psm_add_nmintr(0, (avfunc) apic_nmi_intr,
        "apix NMI handler", (caddr_t)NULL))
        cmn_err(CE_WARN, "apix: Unable to add nmi handler");

    apix_init_intr();

    /* enable apic mode if imcr present */
    if (apic_imcrp) {
        outb(APIC_IMCR_P1, (uchar_t)APIC_IMCR_SELECT);
        outb(APIC_IMCR_P2, (uchar_t)APIC_IMCR_APIC);
    }

    ioapix_init_intr(IOAPIC_MASK);

    /* setup global IRM pool if applicable */
    if (irm_enable)
        apix_irm_init();
}

static __inline__ void
apix_send_eoi(void)
{
    if (apic_mode == LOCAL_APIC)
        LOCAL_APIC_WRITE_REG(APIC_EOI_REG, 0);
    else
        X2APIC_WRITE(APIC_EOI_REG, 0);
}

/*
 * platform_intr_enter
 *
 *  Called at the beginning of the interrupt service routine to
 *  mask all level equal to and below the interrupt priority
 *  of the interrupting vector.  An EOI should be given to
 *  the interrupt controller to enable other HW interrupts.
 *
 *  Return -1 for spurious interrupts
 *
 */
static int
apix_intr_enter(int ipl, int *vectorp)
{
    struct cpu *cpu = CPU;
    uint32_t cpuid = CPU->cpu_id;
    apic_cpus_info_t *cpu_infop;
    uchar_t vector;
    apix_vector_t *vecp;
    int nipl = -1;

    /*
     * The real vector delivered is (*vectorp + 0x20), but our caller
     * subtracts 0x20 from the vector before passing it to us.
     * (That's why APIC_BASE_VECT is 0x20.)
     */
    vector = *vectorp = (uchar_t)*vectorp + APIC_BASE_VECT;

    cpu_infop = &apic_cpus[cpuid];
    if (vector == APIC_SPUR_INTR) {
        cpu_infop->aci_spur_cnt++;
        return (APIC_INT_SPURIOUS);
    }

    vecp = xv_vector(cpuid, vector);
    if (vecp == NULL) {
        if (APIX_IS_FAKE_INTR(vector))
            nipl = apix_rebindinfo.i_pri;
        apix_send_eoi();
        return (nipl);
    }
    nipl = vecp->v_pri;

    /* if interrupted by the clock, increment apic_nsec_since_boot */
    if (vector == (apic_clkvect + APIC_BASE_VECT)) {
        if (!apic_oneshot) {
            /* NOTE: this is not MT aware */
            apic_hrtime_stamp++;
            apic_nsec_since_boot += apic_nsec_per_intr;
            apic_hrtime_stamp++;
            last_count_read = apic_hertz_count;
            apix_redistribute_compute();
        }

        apix_send_eoi();

        return (nipl);
    }

    ASSERT(vecp->v_state != APIX_STATE_OBSOLETED);

    /* pre-EOI handling for level-triggered interrupts */
    if (!APIX_IS_DIRECTED_EOI(apix_mul_ioapic_method) &&
        (vecp->v_type & APIX_TYPE_FIXED) && apic_level_intr[vecp->v_inum])
        apix_level_intr_pre_eoi(vecp->v_inum);

    /* send back EOI */
    apix_send_eoi();

    cpu_infop->aci_current[nipl] = vector;
    if ((nipl > ipl) && (nipl > cpu->cpu_base_spl)) {
        cpu_infop->aci_curipl = (uchar_t)nipl;
        cpu_infop->aci_ISR_in_progress |= 1 << nipl;
    }

#ifdef  DEBUG
    if (vector >= APIX_IPI_MIN)
        return (nipl);  /* skip IPI */

    APIC_DEBUG_BUF_PUT(vector);
    APIC_DEBUG_BUF_PUT(vecp->v_inum);
    APIC_DEBUG_BUF_PUT(nipl);
    APIC_DEBUG_BUF_PUT(psm_get_cpu_id());
    if ((apic_stretch_interrupts) && (apic_stretch_ISR & (1 << nipl)))
        drv_usecwait(apic_stretch_interrupts);
#endif /* DEBUG */

    return (nipl);
}

/*
 * Any changes made to this function must also change X2APIC
 * version of intr_exit.
 */
static void
apix_intr_exit(int prev_ipl, int arg2)
{
    int cpuid = psm_get_cpu_id();
    apic_cpus_info_t *cpu_infop = &apic_cpus[cpuid];
    apix_impl_t *apixp = apixs[cpuid];

    UNREFERENCED_1PARAMETER(arg2);

    cpu_infop->aci_curipl = (uchar_t)prev_ipl;
    /* ISR above current pri could not be in progress */
    cpu_infop->aci_ISR_in_progress &= (2 << prev_ipl) - 1;

    if (apixp->x_obsoletes != NULL) {
        if (APIX_CPU_LOCK_HELD(cpuid))
            return;

        APIX_ENTER_CPU_LOCK(cpuid);
        (void) apix_obsolete_vector(apixp->x_obsoletes);
        APIX_LEAVE_CPU_LOCK(cpuid);
    }
}

/*
 * Mask all interrupts below or equal to the given IPL.
 * Any changes made to this function must also change X2APIC
 * version of setspl.
 */
static void
apix_setspl(int ipl)
{
    /* interrupts at ipl above this cannot be in progress */
    apic_cpus[psm_get_cpu_id()].aci_ISR_in_progress &= (2 << ipl) - 1;

    /*
     * Mask all interrupts for XC_HI_PIL (i.e set TPR to 0xf).
     * Otherwise, enable all interrupts (i.e. set TPR to 0).
     */
    if (ipl != XC_HI_PIL)
        ipl = 0;

#if defined(__amd64)
    setcr8((ulong_t)ipl);
#else
    if (apic_have_32bit_cr8)
        setcr8((ulong_t)ipl);
    else
        apicadr[APIC_TASK_REG] = ipl << APIC_IPL_SHIFT;
#endif

    /*
     * this is a patch fix for the ALR QSMP P5 machine, so that interrupts
     * have enough time to come in before the priority is raised again
     * during the idle() loop.
     */
    if (apic_setspl_delay)
        (void) apic_reg_ops->apic_get_pri();
}

/*
 * X2APIC version of setspl.
 */
static void
x2apix_setspl(int ipl)
{
    /* interrupts at ipl above this cannot be in progress */
    apic_cpus[psm_get_cpu_id()].aci_ISR_in_progress &= (2 << ipl) - 1;

    /*
     * Mask all interrupts for XC_HI_PIL (i.e set TPR to 0xf).
     * Otherwise, enable all interrupts (i.e. set TPR to 0).
     */
    if (ipl != XC_HI_PIL)
        ipl = 0;

    X2APIC_WRITE(APIC_TASK_REG, ipl << APIC_IPL_SHIFT);
}

int
apix_addspl(int virtvec, int ipl, int min_ipl, int max_ipl)
{
    uint32_t cpuid = APIX_VIRTVEC_CPU(virtvec);
    uchar_t vector = (uchar_t)APIX_VIRTVEC_VECTOR(virtvec);
    apix_vector_t *vecp = xv_vector(cpuid, vector);

    UNREFERENCED_3PARAMETER(ipl, min_ipl, max_ipl);
    ASSERT(vecp != NULL && LOCK_HELD(&apix_lock));

    if (vecp->v_type == APIX_TYPE_FIXED)
        apix_intx_set_shared(vecp->v_inum, 1);

    /* There are more interrupts, so it's already been enabled */
    if (vecp->v_share > 1)
        return (PSM_SUCCESS);

    /* return if it is not hardware interrupt */
    if (vecp->v_type == APIX_TYPE_IPI)
        return (PSM_SUCCESS);

    /*
     * if apix_picinit() has not been called yet, just return.
     * At the end of apic_picinit(), we will call setup_io_intr().
     */
    if (!apic_picinit_called)
        return (PSM_SUCCESS);

    (void) apix_setup_io_intr(vecp);

    return (PSM_SUCCESS);
}

int
apix_delspl(int virtvec, int ipl, int min_ipl, int max_ipl)
{
    uint32_t cpuid = APIX_VIRTVEC_CPU(virtvec);
    uchar_t vector = (uchar_t)APIX_VIRTVEC_VECTOR(virtvec);
    apix_vector_t *vecp = xv_vector(cpuid, vector);

    UNREFERENCED_3PARAMETER(ipl, min_ipl, max_ipl);
    ASSERT(vecp != NULL && LOCK_HELD(&apix_lock));

    if (vecp->v_type == APIX_TYPE_FIXED)
        apix_intx_set_shared(vecp->v_inum, -1);

    /* There are more interrupts */
    if (vecp->v_share > 1)
        return (PSM_SUCCESS);

    /* return if it is not hardware interrupt */
    if (vecp->v_type == APIX_TYPE_IPI)
        return (PSM_SUCCESS);

    if (!apic_picinit_called) {
        cmn_err(CE_WARN, "apix: delete 0x%x before apic init",
            virtvec);
        return (PSM_SUCCESS);
    }

    apix_disable_vector(vecp);

    return (PSM_SUCCESS);
}

/*
 * Try and disable all interrupts. We just assign interrupts to other
 * processors based on policy. If any were bound by user request, we
 * let them continue and return failure. We do not bother to check
 * for cache affinity while rebinding.
 */
static int
apix_disable_intr(processorid_t cpun)
{
    apix_impl_t *apixp = apixs[cpun];
    apix_vector_t *vecp, *newp;
    int bindcpu, i, hardbound = 0, errbound = 0, ret, loop, type;

    lock_set(&apix_lock);

    apic_cpus[cpun].aci_status &= ~APIC_CPU_INTR_ENABLE;
    apic_cpus[cpun].aci_curipl = 0;

    /* if this is for SUSPEND operation, skip rebinding */
    if (apic_cpus[cpun].aci_status & APIC_CPU_SUSPEND) {
        for (i = APIX_AVINTR_MIN; i <= APIX_AVINTR_MAX; i++) {
            vecp = apixp->x_vectbl[i];
            if (!IS_VECT_ENABLED(vecp))
                continue;

            apix_disable_vector(vecp);
        }
        lock_clear(&apix_lock);
        return (PSM_SUCCESS);
    }

    for (i = APIX_AVINTR_MIN; i <= APIX_AVINTR_MAX; i++) {
        vecp = apixp->x_vectbl[i];
        if (!IS_VECT_ENABLED(vecp))
            continue;

        if (vecp->v_flags & APIX_VECT_USER_BOUND) {
            hardbound++;
            continue;
        }
        type = vecp->v_type;

        /*
         * If there are bound interrupts on this cpu, then
         * rebind them to other processors.
         */
        loop = 0;
        do {
            bindcpu = apic_find_cpu(APIC_CPU_INTR_ENABLE);

            if (type != APIX_TYPE_MSI)
                newp = apix_set_cpu(vecp, bindcpu, &ret);
            else
                newp = apix_grp_set_cpu(vecp, bindcpu, &ret);
        } while ((newp == NULL) && (loop++ < apic_nproc));

        if (loop >= apic_nproc) {
            errbound++;
            cmn_err(CE_WARN, "apix: failed to rebind vector %x/%x",
                vecp->v_cpuid, vecp->v_vector);
        }
    }

    lock_clear(&apix_lock);

    if (hardbound || errbound) {
        cmn_err(CE_WARN, "Could not disable interrupts on %d"
            "due to user bound interrupts or failed operation",
            cpun);
        return (PSM_FAILURE);
    }

    return (PSM_SUCCESS);
}

/*
 * Bind interrupts to specified CPU
 */
static void
apix_enable_intr(processorid_t cpun)
{
    apix_vector_t *vecp;
    int i, ret;
    processorid_t n;

    lock_set(&apix_lock);

    apic_cpus[cpun].aci_status |= APIC_CPU_INTR_ENABLE;

    /* interrupt enabling for system resume */
    if (apic_cpus[cpun].aci_status & APIC_CPU_SUSPEND) {
        for (i = APIX_AVINTR_MIN; i <= APIX_AVINTR_MAX; i++) {
            vecp = xv_vector(cpun, i);
            if (!IS_VECT_ENABLED(vecp))
                continue;

            apix_enable_vector(vecp);
        }
        apic_cpus[cpun].aci_status &= ~APIC_CPU_SUSPEND;
    }

    for (n = 0; n < apic_nproc; n++) {
        if (!apic_cpu_in_range(n) || n == cpun ||
            (apic_cpus[n].aci_status & APIC_CPU_INTR_ENABLE) == 0)
            continue;

        for (i = APIX_AVINTR_MIN; i <= APIX_AVINTR_MAX; i++) {
            vecp = xv_vector(n, i);
            if (!IS_VECT_ENABLED(vecp) ||
                vecp->v_bound_cpuid != cpun)
                continue;

            if (vecp->v_type != APIX_TYPE_MSI)
                (void) apix_set_cpu(vecp, cpun, &ret);
            else
                (void) apix_grp_set_cpu(vecp, cpun, &ret);
        }
    }

    lock_clear(&apix_lock);
}

/*
 * Allocate vector for IPI
 * type == -1 indicates it is an internal request. Do not change
 * resv_vector for these requests.
 */
static int
apix_get_ipivect(int ipl, int type)
{
    uchar_t vector;

    if ((vector = apix_alloc_ipi(ipl)) > 0) {
        if (type != -1)
            apic_resv_vector[ipl] = vector;
        return (vector);
    }
    apic_error |= APIC_ERR_GET_IPIVECT_FAIL;
    return (-1);    /* shouldn't happen */
}

static int
apix_get_clkvect(int ipl)
{
    int vector;

    if ((vector = apix_get_ipivect(ipl, -1)) == -1)
        return (-1);

    apic_clkvect = vector - APIC_BASE_VECT;
    APIC_VERBOSE(IPI, (CE_CONT, "apix: clock vector = %x\n",
        apic_clkvect));
    return (vector);
}

static int
apix_post_cpu_start()
{
    int cpun;
    static int cpus_started = 1;

    /* We know this CPU + BSP  started successfully. */
    cpus_started++;

    /*
     * On BSP we would have enabled X2APIC, if supported by processor,
     * in acpi_probe(), but on AP we do it here.
     *
     * We enable X2APIC mode only if BSP is running in X2APIC & the
     * local APIC mode of the current CPU is MMIO (xAPIC).
     */
    if (apic_mode == LOCAL_X2APIC && apic_detect_x2apic() &&
        apic_local_mode() == LOCAL_APIC) {
        apic_enable_x2apic();
    }

    /*
     * Switch back to x2apic IPI sending method for performance when target
     * CPU has entered x2apic mode.
     */
    if (apic_mode == LOCAL_X2APIC) {
        apic_switch_ipi_callback(B_FALSE);
    }

    splx(ipltospl(LOCK_LEVEL));
    apix_init_intr();

    /*
     * since some systems don't enable the internal cache on the non-boot
     * cpus, so we have to enable them here
     */
    setcr0(getcr0() & ~(CR0_CD | CR0_NW));

#ifdef  DEBUG
    APIC_AV_PENDING_SET();
#else
    if (apic_mode == LOCAL_APIC)
        APIC_AV_PENDING_SET();
#endif  /* DEBUG */

    /*
     * We may be booting, or resuming from suspend; aci_status will
     * be APIC_CPU_INTR_ENABLE if coming from suspend, so we add the
     * APIC_CPU_ONLINE flag here rather than setting aci_status completely.
     */
    cpun = psm_get_cpu_id();
    apic_cpus[cpun].aci_status |= APIC_CPU_ONLINE;

    apic_reg_ops->apic_write(APIC_DIVIDE_REG, apic_divide_reg_init);

    return (PSM_SUCCESS);
}

/*
 * If this module needs a periodic handler for the interrupt distribution, it
 * can be added here. The argument to the periodic handler is not currently
 * used, but is reserved for future.
 */
static void
apix_post_cyclic_setup(void *arg)
{
    UNREFERENCED_1PARAMETER(arg);

    /* cpu_lock is held */
    /* set up a periodic handler for intr redistribution */

    /*
     * In peridoc mode intr redistribution processing is done in
     * apic_intr_enter during clk intr processing
     */
    if (!apic_oneshot)
        return;

    /*
     * Register a periodical handler for the redistribution processing.
     * On X86, CY_LOW_LEVEL is mapped to the level 2 interrupt, so
     * DDI_IPL_2 should be passed to ddi_periodic_add() here.
     */
    apic_periodic_id = ddi_periodic_add(
        (void (*)(void *))apix_redistribute_compute, NULL,
        apic_redistribute_sample_interval, DDI_IPL_2);
}

void
x2apic_update_psm()
{
    struct psm_ops *pops = &apix_ops;

    ASSERT(pops != NULL);

    /*
     * The xxx_intr_exit() sets TPR and sends back EOI. The
     * xxx_setspl() sets TPR. These two routines are not
     * needed in new design.
     *
     * pops->psm_intr_exit = x2apic_intr_exit;
     * pops->psm_setspl = x2apic_setspl;
     */
    pops->psm_setspl = x2apix_setspl;
    pops->psm_send_ipi = x2apic_send_ipi;

    send_dirintf = pops->psm_send_ipi;

    apic_mode = LOCAL_X2APIC;
    apic_change_ops();
}

/*
 * This function provides external interface to the nexus for all
 * functionalities related to the new DDI interrupt framework.
 *
 * Input:
 * dip     - pointer to the dev_info structure of the requested device
 * hdlp    - pointer to the internal interrupt handle structure for the
 *       requested interrupt
 * intr_op - opcode for this call
 * result  - pointer to the integer that will hold the result to be
 *       passed back if return value is PSM_SUCCESS
 *
 * Output:
 * return value is either PSM_SUCCESS or PSM_FAILURE
 */
static int
apix_intr_ops(dev_info_t *dip, ddi_intr_handle_impl_t *hdlp,
    psm_intr_op_t intr_op, int *result)
{
    int     cap;
    apix_vector_t   *vecp, *newvecp;
    struct intrspec *ispec, intr_spec;
    processorid_t target;

    ispec = &intr_spec;
    ispec->intrspec_pri = hdlp->ih_pri;
    ispec->intrspec_vec = hdlp->ih_inum;
    ispec->intrspec_func = hdlp->ih_cb_func;

    switch (intr_op) {
    case PSM_INTR_OP_ALLOC_VECTORS:
        switch (hdlp->ih_type) {
        case DDI_INTR_TYPE_MSI:
            /* allocate MSI vectors */
            *result = apix_alloc_msi(dip, hdlp->ih_inum,
                hdlp->ih_scratch1,
                (int)(uintptr_t)hdlp->ih_scratch2);
            break;
        case DDI_INTR_TYPE_MSIX:
            /* allocate MSI-X vectors */
            *result = apix_alloc_msix(dip, hdlp->ih_inum,
                hdlp->ih_scratch1,
                (int)(uintptr_t)hdlp->ih_scratch2);
            break;
        case DDI_INTR_TYPE_FIXED:
            /* allocate or share vector for fixed */
            if ((ihdl_plat_t *)hdlp->ih_private == NULL) {
                return (PSM_FAILURE);
            }
            ispec = ((ihdl_plat_t *)hdlp->ih_private)->ip_ispecp;
            *result = apix_intx_alloc_vector(dip, hdlp->ih_inum,
                ispec);
            break;
        default:
            return (PSM_FAILURE);
        }
        break;
    case PSM_INTR_OP_FREE_VECTORS:
        apix_free_vectors(dip, hdlp->ih_inum, hdlp->ih_scratch1,
            hdlp->ih_type);
        break;
    case PSM_INTR_OP_XLATE_VECTOR:
        /*
         * Vectors are allocated by ALLOC and freed by FREE.
         * XLATE finds and returns APIX_VIRTVEC_VECTOR(cpu, vector).
         */
        *result = APIX_INVALID_VECT;
        vecp = apix_get_dev_map(dip, hdlp->ih_inum, hdlp->ih_type);
        if (vecp != NULL) {
            *result = APIX_VIRTVECTOR(vecp->v_cpuid,
                vecp->v_vector);
            break;
        }

        /*
         * No vector to device mapping exists. If this is FIXED type
         * then check if this IRQ is already mapped for another device
         * then return the vector number for it (i.e. shared IRQ case).
         * Otherwise, return PSM_FAILURE.
         */
        if (hdlp->ih_type == DDI_INTR_TYPE_FIXED) {
            vecp = apix_intx_xlate_vector(dip, hdlp->ih_inum,
                ispec);
            *result = (vecp == NULL) ? APIX_INVALID_VECT :
                APIX_VIRTVECTOR(vecp->v_cpuid, vecp->v_vector);
        }
        if (*result == APIX_INVALID_VECT)
            return (PSM_FAILURE);
        break;
    case PSM_INTR_OP_GET_PENDING:
        vecp = apix_get_dev_map(dip, hdlp->ih_inum, hdlp->ih_type);
        if (vecp == NULL)
            return (PSM_FAILURE);

        *result = apix_get_pending(vecp);
        break;
    case PSM_INTR_OP_CLEAR_MASK:
        if (hdlp->ih_type != DDI_INTR_TYPE_FIXED)
            return (PSM_FAILURE);

        vecp = apix_get_dev_map(dip, hdlp->ih_inum, hdlp->ih_type);
        if (vecp == NULL)
            return (PSM_FAILURE);

        apix_intx_clear_mask(vecp->v_inum);
        break;
    case PSM_INTR_OP_SET_MASK:
        if (hdlp->ih_type != DDI_INTR_TYPE_FIXED)
            return (PSM_FAILURE);

        vecp = apix_get_dev_map(dip, hdlp->ih_inum, hdlp->ih_type);
        if (vecp == NULL)
            return (PSM_FAILURE);

        apix_intx_set_mask(vecp->v_inum);
        break;
    case PSM_INTR_OP_GET_SHARED:
        if (hdlp->ih_type != DDI_INTR_TYPE_FIXED)
            return (PSM_FAILURE);

        vecp = apix_get_dev_map(dip, hdlp->ih_inum, hdlp->ih_type);
        if (vecp == NULL)
            return (PSM_FAILURE);

        *result = apix_intx_get_shared(vecp->v_inum);
        break;
    case PSM_INTR_OP_SET_PRI:
        /*
         * Called prior to adding the interrupt handler or when
         * an interrupt handler is unassigned.
         */
        if (hdlp->ih_type == DDI_INTR_TYPE_FIXED)
            return (PSM_SUCCESS);

        if (apix_get_dev_map(dip, hdlp->ih_inum, hdlp->ih_type) == NULL)
            return (PSM_FAILURE);

        break;
    case PSM_INTR_OP_SET_CPU:
    case PSM_INTR_OP_GRP_SET_CPU:
        /*
         * The interrupt handle given here has been allocated
         * specifically for this command, and ih_private carries
         * a CPU value.
         */
        *result = EINVAL;
        target = (int)(intptr_t)hdlp->ih_private;
        if (!apic_cpu_in_range(target)) {
            DDI_INTR_IMPLDBG((CE_WARN,
                "[grp_]set_cpu: cpu out of range: %d\n", target));
            return (PSM_FAILURE);
        }

        lock_set(&apix_lock);

        vecp = apix_get_req_vector(hdlp, hdlp->ih_flags);
        if (!IS_VECT_ENABLED(vecp)) {
            DDI_INTR_IMPLDBG((CE_WARN,
                "[grp]_set_cpu: invalid vector 0x%x\n",
                hdlp->ih_vector));
            lock_clear(&apix_lock);
            return (PSM_FAILURE);
        }

        *result = 0;

        if (intr_op == PSM_INTR_OP_SET_CPU)
            newvecp = apix_set_cpu(vecp, target, result);
        else
            newvecp = apix_grp_set_cpu(vecp, target, result);

        lock_clear(&apix_lock);

        if (newvecp == NULL) {
            *result = EIO;
            return (PSM_FAILURE);
        }
        newvecp->v_bound_cpuid = target;
        hdlp->ih_vector = APIX_VIRTVECTOR(newvecp->v_cpuid,
            newvecp->v_vector);
        break;

    case PSM_INTR_OP_GET_INTR:
        /*
         * The interrupt handle given here has been allocated
         * specifically for this command, and ih_private carries
         * a pointer to a apic_get_intr_t.
         */
        if (apix_get_intr_info(hdlp, hdlp->ih_private) != PSM_SUCCESS)
            return (PSM_FAILURE);
        break;

    case PSM_INTR_OP_CHECK_MSI:
        /*
         * Check MSI/X is supported or not at APIC level and
         * masked off the MSI/X bits in hdlp->ih_type if not
         * supported before return.  If MSI/X is supported,
         * leave the ih_type unchanged and return.
         *
         * hdlp->ih_type passed in from the nexus has all the
         * interrupt types supported by the device.
         */
        if (apic_support_msi == 0) {    /* uninitialized */
            /*
             * if apic_support_msi is not set, call
             * apic_check_msi_support() to check whether msi
             * is supported first
             */
            if (apic_check_msi_support() == PSM_SUCCESS)
                apic_support_msi = 1;   /* supported */
            else
                apic_support_msi = -1;  /* not-supported */
        }
        if (apic_support_msi == 1) {
            if (apic_msix_enable)
                *result = hdlp->ih_type;
            else
                *result = hdlp->ih_type & ~DDI_INTR_TYPE_MSIX;
        } else
            *result = hdlp->ih_type & ~(DDI_INTR_TYPE_MSI |
                DDI_INTR_TYPE_MSIX);
        break;
    case PSM_INTR_OP_GET_CAP:
        cap = DDI_INTR_FLAG_PENDING;
        if (hdlp->ih_type == DDI_INTR_TYPE_FIXED)
            cap |= DDI_INTR_FLAG_MASKABLE;
        *result = cap;
        break;
    case PSM_INTR_OP_APIC_TYPE:
        ((apic_get_type_t *)(hdlp->ih_private))->avgi_type =
            apix_get_apic_type();
        ((apic_get_type_t *)(hdlp->ih_private))->avgi_num_intr =
            APIX_IPI_MIN;
        ((apic_get_type_t *)(hdlp->ih_private))->avgi_num_cpu =
            apic_nproc;
        hdlp->ih_ver = apic_get_apic_version();
        break;
    case PSM_INTR_OP_SET_CAP:
    default:
        return (PSM_FAILURE);
    }

    return (PSM_SUCCESS);
}

static void
apix_cleanup_busy(void)
{
    int i, j;
    apix_vector_t *vecp;

    for (i = 0; i < apic_nproc; i++) {
        if (!apic_cpu_in_range(i))
            continue;
        apic_cpus[i].aci_busy = 0;
        for (j = APIX_AVINTR_MIN; j < APIX_AVINTR_MAX; j++) {
            if ((vecp = xv_vector(i, j)) != NULL)
                vecp->v_busy = 0;
        }
    }
}

static void
apix_redistribute_compute(void)
{
    int i, j, max_busy;

    if (!apic_enable_dynamic_migration)
        return;

    if (++apic_nticks == apic_sample_factor_redistribution) {
        /*
         * Time to call apic_intr_redistribute().
         * reset apic_nticks. This will cause max_busy
         * to be calculated below and if it is more than
         * apic_int_busy, we will do the whole thing
         */
        apic_nticks = 0;
    }
    max_busy = 0;
    for (i = 0; i < apic_nproc; i++) {
        if (!apic_cpu_in_range(i))
            continue;
        /*
         * Check if curipl is non zero & if ISR is in
         * progress
         */
        if (((j = apic_cpus[i].aci_curipl) != 0) &&
            (apic_cpus[i].aci_ISR_in_progress & (1 << j))) {

            int vect;
            apic_cpus[i].aci_busy++;
            vect = apic_cpus[i].aci_current[j];
            apixs[i]->x_vectbl[vect]->v_busy++;
        }

        if (!apic_nticks &&
            (apic_cpus[i].aci_busy > max_busy))
            max_busy = apic_cpus[i].aci_busy;
    }
    if (!apic_nticks) {
        if (max_busy > apic_int_busy_mark) {
        /*
         * We could make the following check be
         * skipped > 1 in which case, we get a
         * redistribution at half the busy mark (due to
         * double interval). Need to be able to collect
         * more empirical data to decide if that is a
         * good strategy. Punt for now.
         */
            apix_cleanup_busy();
            apic_skipped_redistribute = 0;
        } else
            apic_skipped_redistribute++;
    }
}

/*
 * intr_ops() service routines
 */

static int
apix_get_pending(apix_vector_t *vecp)
{
    int bit, index, irr, pending;

    /* need to get on the bound cpu */
    mutex_enter(&cpu_lock);
    affinity_set(vecp->v_cpuid);

    index = vecp->v_vector / 32;
    bit = vecp->v_vector % 32;
    irr = apic_reg_ops->apic_read(APIC_IRR_REG + index);

    affinity_clear();
    mutex_exit(&cpu_lock);

    pending = (irr & (1 << bit)) ? 1 : 0;
    if (!pending && vecp->v_type == APIX_TYPE_FIXED)
        pending = apix_intx_get_pending(vecp->v_inum);

    return (pending);
}

static apix_vector_t *
apix_get_req_vector(ddi_intr_handle_impl_t *hdlp, ushort_t flags)
{
    apix_vector_t *vecp;
    processorid_t cpuid;
    int32_t virt_vec = 0;

    switch (flags & PSMGI_INTRBY_FLAGS) {
    case PSMGI_INTRBY_IRQ:
        return (apix_intx_get_vector(hdlp->ih_vector));
    case PSMGI_INTRBY_VEC:
        virt_vec = (virt_vec == 0) ? hdlp->ih_vector : virt_vec;

        cpuid = APIX_VIRTVEC_CPU(virt_vec);
        if (!apic_cpu_in_range(cpuid))
            return (NULL);

        vecp = xv_vector(cpuid, APIX_VIRTVEC_VECTOR(virt_vec));
        break;
    case PSMGI_INTRBY_DEFAULT:
        vecp = apix_get_dev_map(hdlp->ih_dip, hdlp->ih_inum,
            hdlp->ih_type);
        break;
    default:
        return (NULL);
    }

    return (vecp);
}

static int
apix_get_intr_info(ddi_intr_handle_impl_t *hdlp,
    apic_get_intr_t *intr_params_p)
{
    apix_vector_t *vecp;
    struct autovec *av_dev;
    int i;

    vecp = apix_get_req_vector(hdlp, intr_params_p->avgi_req_flags);
    if (IS_VECT_FREE(vecp)) {
        intr_params_p->avgi_num_devs = 0;
        intr_params_p->avgi_cpu_id = 0;
        intr_params_p->avgi_req_flags = 0;
        return (PSM_SUCCESS);
    }

    if (intr_params_p->avgi_req_flags & PSMGI_REQ_CPUID) {
        intr_params_p->avgi_cpu_id = vecp->v_cpuid;

        /* Return user bound info for intrd. */
        if (intr_params_p->avgi_cpu_id & IRQ_USER_BOUND) {
            intr_params_p->avgi_cpu_id &= ~IRQ_USER_BOUND;
            intr_params_p->avgi_cpu_id |= PSMGI_CPU_USER_BOUND;
        }
    }

    if (intr_params_p->avgi_req_flags & PSMGI_REQ_VECTOR)
        intr_params_p->avgi_vector = vecp->v_vector;

    if (intr_params_p->avgi_req_flags &
        (PSMGI_REQ_NUM_DEVS | PSMGI_REQ_GET_DEVS))
        /* Get number of devices from apic_irq table shared field. */
        intr_params_p->avgi_num_devs = vecp->v_share;

    if (intr_params_p->avgi_req_flags &  PSMGI_REQ_GET_DEVS) {

        intr_params_p->avgi_req_flags  |= PSMGI_REQ_NUM_DEVS;

        /* Some devices have NULL dip.  Don't count these. */
        if (intr_params_p->avgi_num_devs > 0) {
            for (i = 0, av_dev = vecp->v_autovect; av_dev;
                av_dev = av_dev->av_link) {
                if (av_dev->av_vector && av_dev->av_dip)
                    i++;
            }
            intr_params_p->avgi_num_devs =
                (uint8_t)MIN(intr_params_p->avgi_num_devs, i);
        }

        /* There are no viable dips to return. */
        if (intr_params_p->avgi_num_devs == 0) {
            intr_params_p->avgi_dip_list = NULL;

        } else {    /* Return list of dips */

            /* Allocate space in array for that number of devs. */
            intr_params_p->avgi_dip_list = kmem_zalloc(
                intr_params_p->avgi_num_devs *
                sizeof (dev_info_t *),
                KM_NOSLEEP);
            if (intr_params_p->avgi_dip_list == NULL) {
                DDI_INTR_IMPLDBG((CE_WARN,
                    "apix_get_vector_intr_info: no memory"));
                return (PSM_FAILURE);
            }

            /*
             * Loop through the device list of the autovec table
             * filling in the dip array.
             *
             * Note that the autovect table may have some special
             * entries which contain NULL dips.  These will be
             * ignored.
             */
            for (i = 0, av_dev = vecp->v_autovect; av_dev;
                av_dev = av_dev->av_link) {
                if (av_dev->av_vector && av_dev->av_dip)
                    intr_params_p->avgi_dip_list[i++] =
                        av_dev->av_dip;
            }
        }
    }

    return (PSM_SUCCESS);
}

static char *
apix_get_apic_type(void)
{
    return (apix_psm_info.p_mach_idstring);
}

apix_vector_t *
apix_set_cpu(apix_vector_t *vecp, int new_cpu, int *result)
{
    apix_vector_t *newp = NULL;
    dev_info_t *dip;
    int inum, cap_ptr;
    ddi_acc_handle_t handle;
    ddi_intr_msix_t *msix_p = NULL;
    ushort_t msix_ctrl;
    uintptr_t off;
    uint32_t mask;

    ASSERT(LOCK_HELD(&apix_lock));
    *result = ENXIO;

    /* Fail if this is an MSI intr and is part of a group. */
    if (vecp->v_type == APIX_TYPE_MSI) {
        if (i_ddi_intr_get_current_nintrs(APIX_GET_DIP(vecp)) > 1)
            return (NULL);
        else
            return (apix_grp_set_cpu(vecp, new_cpu, result));
    }

    /*
     * Mask MSI-X. It's unmasked when MSI-X gets enabled.
     */
    if (vecp->v_type == APIX_TYPE_MSIX && IS_VECT_ENABLED(vecp)) {
        if ((dip = APIX_GET_DIP(vecp)) == NULL)
            return (NULL);
        inum = vecp->v_devp->dv_inum;

        handle = i_ddi_get_pci_config_handle(dip);
        cap_ptr = i_ddi_get_msi_msix_cap_ptr(dip);
        msix_ctrl = pci_config_get16(handle, cap_ptr + PCI_MSIX_CTRL);
        if ((msix_ctrl & PCI_MSIX_FUNCTION_MASK) == 0) {
            /*
             * Function is not masked, then mask "inum"th
             * entry in the MSI-X table
             */
            msix_p = i_ddi_get_msix(dip);
            off = (uintptr_t)msix_p->msix_tbl_addr + (inum *
                PCI_MSIX_VECTOR_SIZE) + PCI_MSIX_VECTOR_CTRL_OFFSET;
            mask = ddi_get32(msix_p->msix_tbl_hdl, (uint32_t *)off);
            ddi_put32(msix_p->msix_tbl_hdl, (uint32_t *)off,
                mask | 1);
        }
    }

    *result = 0;
    if ((newp = apix_rebind(vecp, new_cpu, 1)) == NULL)
        *result = EIO;

    /* Restore mask bit */
    if (msix_p != NULL)
        ddi_put32(msix_p->msix_tbl_hdl, (uint32_t *)off, mask);

    return (newp);
}

/*
 * Set cpu for MSIs
 */
apix_vector_t *
apix_grp_set_cpu(apix_vector_t *vecp, int new_cpu, int *result)
{
    apix_vector_t *newp, *vp;
    uint32_t orig_cpu = vecp->v_cpuid;
    int orig_vect = vecp->v_vector;
    int i, num_vectors, cap_ptr, msi_mask_off;
    uint32_t msi_pvm;
    ushort_t msi_ctrl;
    ddi_acc_handle_t handle;
    dev_info_t *dip;

    APIC_VERBOSE(INTR, (CE_CONT, "apix_grp_set_cpu: oldcpu: %x, vector: %x,"
        " newcpu:%x\n", vecp->v_cpuid, vecp->v_vector, new_cpu));

    ASSERT(LOCK_HELD(&apix_lock));

    *result = ENXIO;

    if (vecp->v_type != APIX_TYPE_MSI) {
        DDI_INTR_IMPLDBG((CE_WARN, "set_grp: intr not MSI\n"));
        return (NULL);
    }

    if ((dip = APIX_GET_DIP(vecp)) == NULL)
        return (NULL);

    num_vectors = i_ddi_intr_get_current_nintrs(dip);
    if ((num_vectors < 1) || ((num_vectors - 1) & orig_vect)) {
        APIC_VERBOSE(INTR, (CE_WARN,
            "set_grp: base vec not part of a grp or not aligned: "
            "vec:0x%x, num_vec:0x%x\n", orig_vect, num_vectors));
        return (NULL);
    }

    if (vecp->v_inum != apix_get_min_dev_inum(dip, vecp->v_type))
        return (NULL);

    *result = EIO;
    for (i = 1; i < num_vectors; i++) {
        if ((vp = xv_vector(orig_cpu, orig_vect + i)) == NULL)
            return (NULL);
#ifdef DEBUG
        /*
         * Sanity check: CPU and dip is the same for all entries.
         * May be called when first msi to be enabled, at this time
         * add_avintr() is not called for other msi
         */
        if ((vp->v_share != 0) &&
            ((APIX_GET_DIP(vp) != dip) ||
            (vp->v_cpuid != vecp->v_cpuid))) {
            APIC_VERBOSE(INTR, (CE_WARN,
                "set_grp: cpu or dip for vec 0x%x difft than for "
                "vec 0x%x\n", orig_vect, orig_vect + i));
            APIC_VERBOSE(INTR, (CE_WARN,
                "  cpu: %d vs %d, dip: 0x%p vs 0x%p\n", orig_cpu,
                vp->v_cpuid, (void *)dip,
                (void *)APIX_GET_DIP(vp)));
            return (NULL);
        }
#endif /* DEBUG */
    }

    cap_ptr = i_ddi_get_msi_msix_cap_ptr(dip);
    handle = i_ddi_get_pci_config_handle(dip);
    msi_ctrl = pci_config_get16(handle, cap_ptr + PCI_MSI_CTRL);

    /* MSI Per vector masking is supported. */
    if (msi_ctrl & PCI_MSI_PVM_MASK) {
        if (msi_ctrl &  PCI_MSI_64BIT_MASK)
            msi_mask_off = cap_ptr + PCI_MSI_64BIT_MASKBITS;
        else
            msi_mask_off = cap_ptr + PCI_MSI_32BIT_MASK;
        msi_pvm = pci_config_get32(handle, msi_mask_off);
        pci_config_put32(handle, msi_mask_off, (uint32_t)-1);
        APIC_VERBOSE(INTR, (CE_CONT,
            "set_grp: pvm supported.  Mask set to 0x%x\n",
            pci_config_get32(handle, msi_mask_off)));
    }

    if ((newp = apix_rebind(vecp, new_cpu, num_vectors)) != NULL)
        *result = 0;

    /* Reenable vectors if per vector masking is supported. */
    if (msi_ctrl & PCI_MSI_PVM_MASK) {
        pci_config_put32(handle, msi_mask_off, msi_pvm);
        APIC_VERBOSE(INTR, (CE_CONT,
            "set_grp: pvm supported.  Mask restored to 0x%x\n",
            pci_config_get32(handle, msi_mask_off)));
    }

    return (newp);
}

void
apix_intx_set_vector(int irqno, uint32_t cpuid, uchar_t vector)
{
    apic_irq_t *irqp;

    mutex_enter(&airq_mutex);
    irqp = apic_irq_table[irqno];
    irqp->airq_cpu = cpuid;
    irqp->airq_vector = vector;
    apic_record_rdt_entry(irqp, irqno);
    mutex_exit(&airq_mutex);
}

apix_vector_t *
apix_intx_get_vector(int irqno)
{
    apic_irq_t *irqp;
    uint32_t cpuid;
    uchar_t vector;

    mutex_enter(&airq_mutex);
    irqp = apic_irq_table[irqno & 0xff];
    if (IS_IRQ_FREE(irqp) || (irqp->airq_cpu == IRQ_UNINIT)) {
        mutex_exit(&airq_mutex);
        return (NULL);
    }
    cpuid = irqp->airq_cpu;
    vector = irqp->airq_vector;
    mutex_exit(&airq_mutex);

    return (xv_vector(cpuid, vector));
}

/*
 * Must called with interrupts disabled and apic_ioapic_lock held
 */
void
apix_intx_enable(int irqno)
{
    uchar_t ioapicindex, intin;
    apic_irq_t *irqp = apic_irq_table[irqno];
    ioapic_rdt_t irdt;
    apic_cpus_info_t *cpu_infop;
    apix_vector_t *vecp = xv_vector(irqp->airq_cpu, irqp->airq_vector);

    ASSERT(LOCK_HELD(&apic_ioapic_lock) && !IS_IRQ_FREE(irqp));

    ioapicindex = irqp->airq_ioapicindex;
    intin = irqp->airq_intin_no;
    cpu_infop =  &apic_cpus[irqp->airq_cpu];

    irdt.ir_lo = AV_PDEST | AV_FIXED | irqp->airq_rdt_entry;
    irdt.ir_hi = cpu_infop->aci_local_id;

    apic_vt_ops->apic_intrmap_alloc_entry(&vecp->v_intrmap_private, NULL,
        vecp->v_type, 1, ioapicindex);
    apic_vt_ops->apic_intrmap_map_entry(vecp->v_intrmap_private,
        (void *)&irdt, vecp->v_type, 1);
    apic_vt_ops->apic_intrmap_record_rdt(vecp->v_intrmap_private, &irdt);

    /* write RDT entry high dword - destination */
    WRITE_IOAPIC_RDT_ENTRY_HIGH_DWORD(ioapicindex, intin,
        irdt.ir_hi);

    /* Write the vector, trigger, and polarity portion of the RDT */
    WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapicindex, intin, irdt.ir_lo);

    vecp->v_state = APIX_STATE_ENABLED;

    APIC_VERBOSE_IOAPIC((CE_CONT, "apix_intx_enable: ioapic 0x%x"
        " intin 0x%x rdt_low 0x%x rdt_high 0x%x\n",
        ioapicindex, intin, irdt.ir_lo, irdt.ir_hi));
}

/*
 * Must called with interrupts disabled and apic_ioapic_lock held
 */
void
apix_intx_disable(int irqno)
{
    apic_irq_t *irqp = apic_irq_table[irqno];
    int ioapicindex, intin;

    ASSERT(LOCK_HELD(&apic_ioapic_lock) && !IS_IRQ_FREE(irqp));
    /*
     * The assumption here is that this is safe, even for
     * systems with IOAPICs that suffer from the hardware
     * erratum because all devices have been quiesced before
     * they unregister their interrupt handlers.  If that
     * assumption turns out to be false, this mask operation
     * can induce the same erratum result we're trying to
     * avoid.
     */
    ioapicindex = irqp->airq_ioapicindex;
    intin = irqp->airq_intin_no;
    ioapic_write(ioapicindex, APIC_RDT_CMD + 2 * intin, AV_MASK);

    APIC_VERBOSE_IOAPIC((CE_CONT, "apix_intx_disable: ioapic 0x%x"
        " intin 0x%x\n", ioapicindex, intin));
}

void
apix_intx_free(int irqno)
{
    apic_irq_t *irqp;

    mutex_enter(&airq_mutex);
    irqp = apic_irq_table[irqno];

    if (IS_IRQ_FREE(irqp)) {
        mutex_exit(&airq_mutex);
        return;
    }

    irqp->airq_mps_intr_index = FREE_INDEX;
    irqp->airq_cpu = IRQ_UNINIT;
    irqp->airq_vector = APIX_INVALID_VECT;
    mutex_exit(&airq_mutex);
}

#ifdef DEBUG
int apix_intr_deliver_timeouts = 0;
int apix_intr_rirr_timeouts = 0;
int apix_intr_rirr_reset_failure = 0;
#endif
int apix_max_reps_irr_pending = 10;

#define GET_RDT_BITS(ioapic, intin, bits)   \
    (READ_IOAPIC_RDT_ENTRY_LOW_DWORD((ioapic), (intin)) & (bits))
#define APIX_CHECK_IRR_DELAY    drv_usectohz(5000)

int
apix_intx_rebind(int irqno, processorid_t cpuid, uchar_t vector)
{
    apic_irq_t *irqp = apic_irq_table[irqno];
    ulong_t iflag;
    int waited, ioapic_ix, intin_no, level, repeats, rdt_entry, masked;

    ASSERT(irqp != NULL);

    iflag = intr_clear();
    lock_set(&apic_ioapic_lock);

    ioapic_ix = irqp->airq_ioapicindex;
    intin_no = irqp->airq_intin_no;
    level = apic_level_intr[irqno];

    /*
     * Wait for the delivery status bit to be cleared. This should
     * be a very small amount of time.
     */
    repeats = 0;
    do {
        repeats++;

        for (waited = 0; waited < apic_max_reps_clear_pending;
            waited++) {
            if (GET_RDT_BITS(ioapic_ix, intin_no, AV_PENDING) == 0)
                break;
        }
        if (!level)
            break;

        /*
         * Mask the RDT entry for level-triggered interrupts.
         */
        irqp->airq_rdt_entry |= AV_MASK;
        rdt_entry = READ_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapic_ix,
            intin_no);
        if ((masked = (rdt_entry & AV_MASK)) == 0) {
            /* Mask it */
            WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapic_ix, intin_no,
                AV_MASK | rdt_entry);
        }

        /*
         * If there was a race and an interrupt was injected
         * just before we masked, check for that case here.
         * Then, unmask the RDT entry and try again.  If we're
         * on our last try, don't unmask (because we want the
         * RDT entry to remain masked for the rest of the
         * function).
         */
        rdt_entry = READ_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapic_ix,
            intin_no);
        if ((masked == 0) && ((rdt_entry & AV_PENDING) != 0) &&
            (repeats < apic_max_reps_clear_pending)) {
            /* Unmask it */
            WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapic_ix,
                intin_no, rdt_entry & ~AV_MASK);
            irqp->airq_rdt_entry &= ~AV_MASK;
        }
    } while ((rdt_entry & AV_PENDING) &&
        (repeats < apic_max_reps_clear_pending));

#ifdef DEBUG
    if (GET_RDT_BITS(ioapic_ix, intin_no, AV_PENDING) != 0)
        apix_intr_deliver_timeouts++;
#endif

    if (!level || !APIX_IS_MASK_RDT(apix_mul_ioapic_method))
        goto done;

    /*
     * wait for remote IRR to be cleared for level-triggered
     * interrupts
     */
    repeats = 0;
    do {
        repeats++;

        for (waited = 0; waited < apic_max_reps_clear_pending;
            waited++) {
            if (GET_RDT_BITS(ioapic_ix, intin_no, AV_REMOTE_IRR)
                == 0)
                break;
        }

        if (GET_RDT_BITS(ioapic_ix, intin_no, AV_REMOTE_IRR) != 0) {
            lock_clear(&apic_ioapic_lock);
            intr_restore(iflag);

            delay(APIX_CHECK_IRR_DELAY);

            iflag = intr_clear();
            lock_set(&apic_ioapic_lock);
        }
    } while (repeats < apix_max_reps_irr_pending);

    if (repeats >= apix_max_reps_irr_pending) {
#ifdef DEBUG
        apix_intr_rirr_timeouts++;
#endif

        /*
         * If we waited and the Remote IRR bit is still not cleared,
         * AND if we've invoked the timeout APIC_REPROGRAM_MAX_TIMEOUTS
         * times for this interrupt, try the last-ditch workaround:
         */
        if (GET_RDT_BITS(ioapic_ix, intin_no, AV_REMOTE_IRR) != 0) {
            /*
             * Trying to clear the bit through normal
             * channels has failed.  So as a last-ditch
             * effort, try to set the trigger mode to
             * edge, then to level.  This has been
             * observed to work on many systems.
             */
            WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapic_ix,
                intin_no,
                READ_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapic_ix,
                intin_no) & ~AV_LEVEL);
            WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapic_ix,
                intin_no,
                READ_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapic_ix,
                intin_no) | AV_LEVEL);
        }

        if (GET_RDT_BITS(ioapic_ix, intin_no, AV_REMOTE_IRR) != 0) {
#ifdef DEBUG
            apix_intr_rirr_reset_failure++;
#endif
            lock_clear(&apic_ioapic_lock);
            intr_restore(iflag);
            prom_printf("apix: Remote IRR still "
                "not clear for IOAPIC %d intin %d.\n"
                "\tInterrupts to this pin may cease "
                "functioning.\n", ioapic_ix, intin_no);
            return (1); /* return failure */
        }
    }

done:
    /* change apic_irq_table */
    lock_clear(&apic_ioapic_lock);
    intr_restore(iflag);
    apix_intx_set_vector(irqno, cpuid, vector);
    iflag = intr_clear();
    lock_set(&apic_ioapic_lock);

    /* reprogramme IO-APIC RDT entry */
    apix_intx_enable(irqno);

    lock_clear(&apic_ioapic_lock);
    intr_restore(iflag);

    return (0);
}

static int
apix_intx_get_pending(int irqno)
{
    apic_irq_t *irqp;
    int intin, ioapicindex, pending;
    ulong_t iflag;

    mutex_enter(&airq_mutex);
    irqp = apic_irq_table[irqno];
    if (IS_IRQ_FREE(irqp)) {
        mutex_exit(&airq_mutex);
        return (0);
    }

    /* check IO-APIC delivery status */
    intin = irqp->airq_intin_no;
    ioapicindex = irqp->airq_ioapicindex;
    mutex_exit(&airq_mutex);

    iflag = intr_clear();
    lock_set(&apic_ioapic_lock);

    pending = (READ_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapicindex, intin) &
        AV_PENDING) ? 1 : 0;

    lock_clear(&apic_ioapic_lock);
    intr_restore(iflag);

    return (pending);
}

static void
apix_intx_set_mask(int irqno)
{
    int intin, ioapixindex, rdt_entry;
    ulong_t iflag;
    apic_irq_t *irqp;

    mutex_enter(&airq_mutex);
    irqp = apic_irq_table[irqno];

    ASSERT(irqp->airq_mps_intr_index != FREE_INDEX);

    intin = irqp->airq_intin_no;
    ioapixindex = irqp->airq_ioapicindex;
    mutex_exit(&airq_mutex);

    iflag = intr_clear();
    lock_set(&apic_ioapic_lock);

    rdt_entry = READ_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapixindex, intin);

    /* clear mask */
    WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapixindex, intin,
        (AV_MASK | rdt_entry));

    lock_clear(&apic_ioapic_lock);
    intr_restore(iflag);
}

static void
apix_intx_clear_mask(int irqno)
{
    int intin, ioapixindex, rdt_entry;
    ulong_t iflag;
    apic_irq_t *irqp;

    mutex_enter(&airq_mutex);
    irqp = apic_irq_table[irqno];

    ASSERT(irqp->airq_mps_intr_index != FREE_INDEX);

    intin = irqp->airq_intin_no;
    ioapixindex = irqp->airq_ioapicindex;
    mutex_exit(&airq_mutex);

    iflag = intr_clear();
    lock_set(&apic_ioapic_lock);

    rdt_entry = READ_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapixindex, intin);

    /* clear mask */
    WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(ioapixindex, intin,
        ((~AV_MASK) & rdt_entry));

    lock_clear(&apic_ioapic_lock);
    intr_restore(iflag);
}

/*
 * For level-triggered interrupt, mask the IRQ line. Mask means
 * new interrupts will not be delivered. The interrupt already
 * accepted by a local APIC is not affected
 */
void
apix_level_intr_pre_eoi(int irq)
{
    apic_irq_t *irqp = apic_irq_table[irq];
    int apic_ix, intin_ix;

    if (irqp == NULL)
        return;

    ASSERT(apic_level_intr[irq] == TRIGGER_MODE_LEVEL);

    lock_set(&apic_ioapic_lock);

    intin_ix = irqp->airq_intin_no;
    apic_ix = irqp->airq_ioapicindex;

    if (irqp->airq_cpu != CPU->cpu_id) {
        if (!APIX_IS_MASK_RDT(apix_mul_ioapic_method))
            ioapic_write_eoi(apic_ix, irqp->airq_vector);
        lock_clear(&apic_ioapic_lock);
        return;
    }

    if (apix_mul_ioapic_method == APIC_MUL_IOAPIC_IOXAPIC) {
        /*
         * This is a IOxAPIC and there is EOI register:
         *  Change the vector to reserved unused vector, so that
         *  the EOI from Local APIC won't clear the Remote IRR for
         *  this level trigger interrupt. Instead, we'll manually
         *  clear it in apix_post_hardint() after ISR handling.
         */
        WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(apic_ix, intin_ix,
            (irqp->airq_rdt_entry & (~0xff)) | APIX_RESV_VECTOR);
    } else {
        WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(apic_ix, intin_ix,
            AV_MASK | irqp->airq_rdt_entry);
    }

    lock_clear(&apic_ioapic_lock);
}

/*
 * For level-triggered interrupt, unmask the IRQ line
 * or restore the original vector number.
 */
void
apix_level_intr_post_dispatch(int irq)
{
    apic_irq_t *irqp = apic_irq_table[irq];
    int apic_ix, intin_ix;

    if (irqp == NULL)
        return;

    lock_set(&apic_ioapic_lock);

    intin_ix = irqp->airq_intin_no;
    apic_ix = irqp->airq_ioapicindex;

    if (APIX_IS_DIRECTED_EOI(apix_mul_ioapic_method)) {
        /*
         * Already sent EOI back to Local APIC.
         * Send EOI to IO-APIC
         */
        ioapic_write_eoi(apic_ix, irqp->airq_vector);
    } else {
        /* clear the mask or restore the vector */
        WRITE_IOAPIC_RDT_ENTRY_LOW_DWORD(apic_ix, intin_ix,
            irqp->airq_rdt_entry);

        /* send EOI to IOxAPIC */
        if (apix_mul_ioapic_method == APIC_MUL_IOAPIC_IOXAPIC)
            ioapic_write_eoi(apic_ix, irqp->airq_vector);
    }

    lock_clear(&apic_ioapic_lock);
}

static int
apix_intx_get_shared(int irqno)
{
    apic_irq_t *irqp;
    int share;

    mutex_enter(&airq_mutex);
    irqp = apic_irq_table[irqno];
    if (IS_IRQ_FREE(irqp) || (irqp->airq_cpu == IRQ_UNINIT)) {
        mutex_exit(&airq_mutex);
        return (0);
    }
    share = irqp->airq_share;
    mutex_exit(&airq_mutex);

    return (share);
}

static void
apix_intx_set_shared(int irqno, int delta)
{
    apic_irq_t *irqp;

    mutex_enter(&airq_mutex);
    irqp = apic_irq_table[irqno];
    if (IS_IRQ_FREE(irqp)) {
        mutex_exit(&airq_mutex);
        return;
    }
    irqp->airq_share += delta;
    mutex_exit(&airq_mutex);
}

/*
 * Setup IRQ table. Return IRQ no or -1 on failure
 */
static int
apix_intx_setup(dev_info_t *dip, int inum, int irqno,
    struct apic_io_intr *intrp, struct intrspec *ispec, iflag_t *iflagp)
{
    int origirq = ispec->intrspec_vec;
    int newirq;
    short intr_index;
    uchar_t ipin, ioapic, ioapicindex;
    apic_irq_t *irqp;

    UNREFERENCED_1PARAMETER(inum);

    if (intrp != NULL) {
        intr_index = (short)(intrp - apic_io_intrp);
        ioapic = intrp->intr_destid;
        ipin = intrp->intr_destintin;

        /* Find ioapicindex. If destid was ALL, we will exit with 0. */
        for (ioapicindex = apic_io_max - 1; ioapicindex; ioapicindex--)
            if (apic_io_id[ioapicindex] == ioapic)
                break;
        ASSERT((ioapic == apic_io_id[ioapicindex]) ||
            (ioapic == INTR_ALL_APIC));

        /* check whether this intin# has been used by another irqno */
        if ((newirq = apic_find_intin(ioapicindex, ipin)) != -1)
            return (newirq);

    } else if (iflagp != NULL) {    /* ACPI */
        intr_index = ACPI_INDEX;
        ioapicindex = acpi_find_ioapic(irqno);
        ASSERT(ioapicindex != 0xFF);
        ioapic = apic_io_id[ioapicindex];
        ipin = irqno - apic_io_vectbase[ioapicindex];

        if (apic_irq_table[irqno] &&
            apic_irq_table[irqno]->airq_mps_intr_index == ACPI_INDEX) {
            ASSERT(apic_irq_table[irqno]->airq_intin_no == ipin &&
                apic_irq_table[irqno]->airq_ioapicindex ==
                ioapicindex);
            return (irqno);
        }

    } else {    /* default configuration */
        intr_index = DEFAULT_INDEX;
        ioapicindex = 0;
        ioapic = apic_io_id[ioapicindex];
        ipin = (uchar_t)irqno;
    }

    /* allocate a new IRQ no */
    if ((irqp = apic_irq_table[irqno]) == NULL) {
        irqp = kmem_zalloc(sizeof (apic_irq_t), KM_SLEEP);
        apic_irq_table[irqno] = irqp;
    } else {
        if (irqp->airq_mps_intr_index != FREE_INDEX) {
            newirq = apic_allocate_irq(apic_first_avail_irq);
            if (newirq == -1) {
                return (-1);
            }
            irqno = newirq;
            irqp = apic_irq_table[irqno];
            ASSERT(irqp != NULL);
        }
    }
    apic_max_device_irq = max(irqno, apic_max_device_irq);
    apic_min_device_irq = min(irqno, apic_min_device_irq);

    irqp->airq_mps_intr_index = intr_index;
    irqp->airq_ioapicindex = ioapicindex;
    irqp->airq_intin_no = ipin;
    irqp->airq_dip = dip;
    irqp->airq_origirq = (uchar_t)origirq;
    if (iflagp != NULL)
        irqp->airq_iflag = *iflagp;
    irqp->airq_cpu = IRQ_UNINIT;
    irqp->airq_vector = 0;

    return (irqno);
}

/*
 * Setup IRQ table for non-pci devices. Return IRQ no or -1 on error
 */
static int
apix_intx_setup_nonpci(dev_info_t *dip, int inum, int bustype,
    struct intrspec *ispec)
{
    int irqno = ispec->intrspec_vec;
    int newirq, i;
    iflag_t intr_flag;
    ACPI_SUBTABLE_HEADER    *hp;
    ACPI_MADT_INTERRUPT_OVERRIDE *isop;
    struct apic_io_intr *intrp;

    if (!apic_enable_acpi || apic_use_acpi_madt_only) {
        int busid;

        if (bustype == 0)
            bustype = eisa_level_intr_mask ? BUS_EISA : BUS_ISA;

        /* loop checking BUS_ISA/BUS_EISA */
        for (i = 0; i < 2; i++) {
            if (((busid = apic_find_bus_id(bustype)) != -1) &&
                ((intrp = apic_find_io_intr_w_busid(irqno, busid))
                != NULL)) {
                return (apix_intx_setup(dip, inum, irqno,
                    intrp, ispec, NULL));
            }
            bustype = (bustype == BUS_EISA) ? BUS_ISA : BUS_EISA;
        }

        /* fall back to default configuration */
        return (-1);
    }

    /* search iso entries first */
    if (acpi_iso_cnt != 0) {
        hp = (ACPI_SUBTABLE_HEADER *)acpi_isop;
        i = 0;
        while (i < acpi_iso_cnt) {
            if (hp->Type == ACPI_MADT_TYPE_INTERRUPT_OVERRIDE) {
                isop = (ACPI_MADT_INTERRUPT_OVERRIDE *) hp;
                if (isop->Bus == 0 &&
                    isop->SourceIrq == irqno) {
                    newirq = isop->GlobalIrq;
                    intr_flag.intr_po = isop->IntiFlags &
                        ACPI_MADT_POLARITY_MASK;
                    intr_flag.intr_el = (isop->IntiFlags &
                        ACPI_MADT_TRIGGER_MASK) >> 2;
                    intr_flag.bustype = BUS_ISA;

                    return (apix_intx_setup(dip, inum,
                        newirq, NULL, ispec, &intr_flag));
                }
                i++;
            }
            hp = (ACPI_SUBTABLE_HEADER *)(((char *)hp) +
                hp->Length);
        }
    }
    intr_flag.intr_po = INTR_PO_ACTIVE_HIGH;
    intr_flag.intr_el = INTR_EL_EDGE;
    intr_flag.bustype = BUS_ISA;
    return (apix_intx_setup(dip, inum, irqno, NULL, ispec, &intr_flag));
}


/*
 * Setup IRQ table for pci devices. Return IRQ no or -1 on error
 */
static int
apix_intx_setup_pci(dev_info_t *dip, int inum, int bustype,
    struct intrspec *ispec)
{
    int busid, devid, pci_irq;
    ddi_acc_handle_t cfg_handle;
    uchar_t ipin;
    iflag_t intr_flag;
    struct apic_io_intr *intrp;

    if (acpica_get_bdf(dip, &busid, &devid, NULL) != 0)
        return (-1);

    if (busid == 0 && apic_pci_bus_total == 1)
        busid = (int)apic_single_pci_busid;

    if (pci_config_setup(dip, &cfg_handle) != DDI_SUCCESS)
        return (-1);
    ipin = pci_config_get8(cfg_handle, PCI_CONF_IPIN) - PCI_INTA;
    pci_config_teardown(&cfg_handle);

    if (apic_enable_acpi && !apic_use_acpi_madt_only) { /* ACPI */
        if (apic_acpi_translate_pci_irq(dip, busid, devid,
            ipin, &pci_irq, &intr_flag) != ACPI_PSM_SUCCESS)
            return (-1);

        intr_flag.bustype = (uchar_t)bustype;
        return (apix_intx_setup(dip, inum, pci_irq, NULL, ispec,
            &intr_flag));
    }

    /* MP configuration table */
    pci_irq = ((devid & 0x1f) << 2) | (ipin & 0x3);
    if ((intrp = apic_find_io_intr_w_busid(pci_irq, busid)) == NULL) {
        pci_irq = apic_handle_pci_pci_bridge(dip, devid, ipin, &intrp);
        if (pci_irq == -1)
            return (-1);
    }

    return (apix_intx_setup(dip, inum, pci_irq, intrp, ispec, NULL));
}

/*
 * Translate and return IRQ no
 */
static int
apix_intx_xlate_irq(dev_info_t *dip, int inum, struct intrspec *ispec)
{
    int newirq, irqno = ispec->intrspec_vec;
    int parent_is_pci_or_pciex = 0, child_is_pciex = 0;
    int bustype = 0, dev_len;
    char dev_type[16];

    if (apic_defconf) {
        mutex_enter(&airq_mutex);
        goto defconf;
    }

    if ((dip == NULL) || (!apic_irq_translate && !apic_enable_acpi)) {
        mutex_enter(&airq_mutex);
        goto nonpci;
    }

    /*
     * use ddi_getlongprop_buf() instead of ddi_prop_lookup_string()
     * to avoid extra buffer allocation.
     */
    dev_len = sizeof (dev_type);
    if (ddi_getlongprop_buf(DDI_DEV_T_ANY, ddi_get_parent(dip),
        DDI_PROP_DONTPASS, "device_type", (caddr_t)dev_type,
        &dev_len) == DDI_PROP_SUCCESS) {
        if ((strcmp(dev_type, "pci") == 0) ||
            (strcmp(dev_type, "pciex") == 0))
            parent_is_pci_or_pciex = 1;
    }

    if (ddi_getlongprop_buf(DDI_DEV_T_ANY, dip,
        DDI_PROP_DONTPASS, "compatible", (caddr_t)dev_type,
        &dev_len) == DDI_PROP_SUCCESS) {
        if (strstr(dev_type, "pciex"))
            child_is_pciex = 1;
    }

    mutex_enter(&airq_mutex);

    if (parent_is_pci_or_pciex) {
        bustype = child_is_pciex ? BUS_PCIE : BUS_PCI;
        newirq = apix_intx_setup_pci(dip, inum, bustype, ispec);
        if (newirq != -1)
            goto done;
        bustype = 0;
    } else if (strcmp(dev_type, "isa") == 0)
        bustype = BUS_ISA;
    else if (strcmp(dev_type, "eisa") == 0)
        bustype = BUS_EISA;

nonpci:
    newirq = apix_intx_setup_nonpci(dip, inum, bustype, ispec);
    if (newirq != -1)
        goto done;

defconf:
    newirq = apix_intx_setup(dip, inum, irqno, NULL, ispec, NULL);
    if (newirq == -1) {
        mutex_exit(&airq_mutex);
        return (-1);
    }
done:
    ASSERT(apic_irq_table[newirq]);
    mutex_exit(&airq_mutex);
    return (newirq);
}

static int
apix_intx_alloc_vector(dev_info_t *dip, int inum, struct intrspec *ispec)
{
    int irqno;
    apix_vector_t *vecp;

    if ((irqno = apix_intx_xlate_irq(dip, inum, ispec)) == -1)
        return (0);

    if ((vecp = apix_alloc_intx(dip, inum, irqno)) == NULL)
        return (0);

    DDI_INTR_IMPLDBG((CE_CONT, "apix_intx_alloc_vector: dip=0x%p name=%s "
        "irqno=0x%x cpuid=%d vector=0x%x\n",
        (void *)dip, ddi_driver_name(dip), irqno,
        vecp->v_cpuid, vecp->v_vector));

    return (1);
}

/*
 * Return the vector number if the translated IRQ for this device
 * has a vector mapping setup. If no IRQ setup exists or no vector is
 * allocated to it then return 0.
 */
static apix_vector_t *
apix_intx_xlate_vector(dev_info_t *dip, int inum, struct intrspec *ispec)
{
    int irqno;
    apix_vector_t *vecp;

    /* get the IRQ number */
    if ((irqno = apix_intx_xlate_irq(dip, inum, ispec)) == -1)
        return (NULL);

    /* get the vector number if a vector is allocated to this irqno */
    vecp = apix_intx_get_vector(irqno);

    return (vecp);
}

/* stub function */
int
apix_loaded(void)
{
    return (apix_is_enabled);
}