io/pcplusmp/apic.c

	apic.c revision c8589f13ba961772dd5a0d699c5bb926f3006c33
/*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * 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.
 */
#define PSMI_1_5

#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/apic.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/cyclic.h>
#include <sys/note.h>
#include <sys/pci_intr_lib.h>
#include <sys/spl.h>

/*
 *  Local Function Prototypes
 */
static void apic_init_intr();
static void apic_ret();
static int get_apic_cmd1();
static int get_apic_pri();
static void apic_nmi_intr(caddr_t arg);

/*
 *  standard MP entries
 */
static int  apic_probe();
static int  apic_clkinit();
static int  apic_getclkirq(int ipl);
static uint_t   apic_calibrate(volatile uint32_t *addr,
    uint16_t *pit_ticks_adj);
static hrtime_t apic_gettime();
static hrtime_t apic_gethrtime();
static void apic_init();
static void apic_picinit(void);
static int  apic_cpu_start(processorid_t, caddr_t);
static int  apic_post_cpu_start(void);
static void apic_send_ipi(int cpun, int ipl);
static void apic_set_softintr(int softintr);
static void apic_set_idlecpu(processorid_t cpun);
static void apic_unset_idlecpu(processorid_t cpun);
static int  apic_softlvl_to_irq(int ipl);
static int  apic_intr_enter(int ipl, int *vect);
static void apic_setspl(int ipl);
static int  apic_addspl(int ipl, int vector, int min_ipl, int max_ipl);
static int  apic_delspl(int ipl, int vector, int min_ipl, int max_ipl);
static void apic_shutdown(int cmd, int fcn);
static void apic_preshutdown(int cmd, int fcn);
static int  apic_disable_intr(processorid_t cpun);
static void apic_enable_intr(processorid_t cpun);
static processorid_t    apic_get_next_processorid(processorid_t cpun);
static int      apic_get_ipivect(int ipl, int type);
static void apic_timer_reprogram(hrtime_t time);
static void apic_timer_enable(void);
static void apic_timer_disable(void);
static void apic_post_cyclic_setup(void *arg);

static int  apic_oneshot = 0;
int apic_oneshot_enable = 1; /* to allow disabling one-shot capability */

/* Now the ones for Dynamic Interrupt distribution */
int apic_enable_dynamic_migration = 0;


/*
 * These variables are frequently accessed in apic_intr_enter(),
 * apic_intr_exit and apic_setspl, so group them together
 */
volatile uint32_t *apicadr =  NULL; /* virtual addr of local APIC   */
int apic_setspl_delay = 1;      /* apic_setspl - delay enable   */
int apic_clkvect;

/* vector at which error interrupts come in */
int apic_errvect;
int apic_enable_error_intr = 1;
int apic_error_display_delay = 100;

/* vector at which performance counter overflow interrupts come in */
int apic_cpcovf_vect;
int apic_enable_cpcovf_intr = 1;

/*
 * The following vector assignments influence the value of ipltopri and
 * vectortoipl. Note that vectors 0 - 0x1f are not used. We can program
 * idle to 0 and IPL 0 to 0xf to differentiate idle in case
 * we care to do so in future. Note some IPLs which are rarely used
 * will share the vector ranges and heavily used IPLs (5 and 6) have
 * a wide range.
 *
 * This array is used to initialize apic_ipls[] (in apic_init()).
 *
 *  IPL     Vector range.       as passed to intr_enter
 *  0       none.
 *  1,2,3       0x20-0x2f       0x0-0xf
 *  4       0x30-0x3f       0x10-0x1f
 *  5       0x40-0x5f       0x20-0x3f
 *  6       0x60-0x7f       0x40-0x5f
 *  7,8,9       0x80-0x8f       0x60-0x6f
 *  10      0x90-0x9f       0x70-0x7f
 *  11      0xa0-0xaf       0x80-0x8f
 *  ...     ...
 *  15      0xe0-0xef       0xc0-0xcf
 *  15      0xf0-0xff       0xd0-0xdf
 */
uchar_t apic_vectortoipl[APIC_AVAIL_VECTOR / APIC_VECTOR_PER_IPL] = {
    3, 4, 5, 5, 6, 6, 9, 10, 11, 12, 13, 14, 15, 15
};
    /*
     * The ipl of an ISR at vector X is apic_vectortoipl[X>>4]
     * NOTE that this is vector as passed into intr_enter which is
     * programmed vector - 0x20 (APIC_BASE_VECT)
     */

uchar_t apic_ipltopri[MAXIPL + 1];  /* unix ipl to apic pri */
    /* The taskpri to be programmed into apic to mask given ipl */

#if defined(__amd64)
uchar_t apic_cr8pri[MAXIPL + 1];    /* unix ipl to cr8 pri  */
#endif

/*
 * Correlation of the hardware vector to the IPL in use, initialized
 * from apic_vectortoipl[] in apic_init().  The final IPLs may not correlate
 * to the IPLs in apic_vectortoipl on some systems that share interrupt lines
 * connected to errata-stricken IOAPICs
 */
uchar_t apic_ipls[APIC_AVAIL_VECTOR];

/*
 * Patchable global variables.
 */
int apic_forceload = 0;

int apic_coarse_hrtime = 1;     /* 0 - use accurate slow gethrtime() */
                    /* 1 - use gettime() for performance */
int apic_flat_model = 0;        /* 0 - clustered. 1 - flat */
int apic_enable_hwsoftint = 0;  /* 0 - disable, 1 - enable  */
int apic_enable_bind_log = 1;   /* 1 - display interrupt binding log */
int apic_panic_on_nmi = 0;
int apic_panic_on_apic_error = 0;

int apic_verbose = 0;

/* minimum number of timer ticks to program to */
int apic_min_timer_ticks = 1;
/*
 *  Local static data
 */
static struct   psm_ops apic_ops = {
    apic_probe,

    apic_init,
    apic_picinit,
    apic_intr_enter,
    apic_intr_exit,
    apic_setspl,
    apic_addspl,
    apic_delspl,
    apic_disable_intr,
    apic_enable_intr,
    apic_softlvl_to_irq,
    apic_set_softintr,

    apic_set_idlecpu,
    apic_unset_idlecpu,

    apic_clkinit,
    apic_getclkirq,
    (void (*)(void))NULL,       /* psm_hrtimeinit */
    apic_gethrtime,

    apic_get_next_processorid,
    apic_cpu_start,
    apic_post_cpu_start,
    apic_shutdown,
    apic_get_ipivect,
    apic_send_ipi,

    (int (*)(dev_info_t *, int))NULL,   /* psm_translate_irq */
    (void (*)(int, char *))NULL,    /* psm_notify_error */
    (void (*)(int))NULL,        /* psm_notify_func */
    apic_timer_reprogram,
    apic_timer_enable,
    apic_timer_disable,
    apic_post_cyclic_setup,
    apic_preshutdown,
    apic_intr_ops           /* Advanced DDI Interrupt framework */
};


static struct   psm_info apic_psm_info = {
    PSM_INFO_VER01_5,           /* version */
    PSM_OWN_EXCLUSIVE,          /* ownership */
    (struct psm_ops *)&apic_ops,        /* operation */
    "pcplusmp",             /* machine name */
    "pcplusmp v1.4 compatible %I%",
};

static void *apic_hdlp;

#ifdef DEBUG
int apic_debug = 0;
int apic_restrict_vector = 0;

int apic_debug_msgbuf[APIC_DEBUG_MSGBUFSIZE];
int apic_debug_msgbufindex = 0;

#endif /* DEBUG */

apic_cpus_info_t    *apic_cpus;

cpuset_t    apic_cpumask;
uint_t  apic_flag;

/* Flag to indicate that we need to shut down all processors */
static uint_t   apic_shutdown_processors;

uint_t apic_nsec_per_intr = 0;

/*
 * apic_let_idle_redistribute can have the following values:
 * 0 - If clock decremented it from 1 to 0, clock has to call redistribute.
 * apic_redistribute_lock prevents multiple idle cpus from redistributing
 */
int apic_num_idle_redistributions = 0;
static  int apic_let_idle_redistribute = 0;
static  uint_t apic_nticks = 0;
static  uint_t apic_skipped_redistribute = 0;

/* to gather intr data and redistribute */
static void apic_redistribute_compute(void);

static  uint_t last_count_read = 0;
static  lock_t  apic_gethrtime_lock;
volatile int    apic_hrtime_stamp = 0;
volatile hrtime_t apic_nsec_since_boot = 0;
static uint_t apic_hertz_count;

uint64_t apic_ticks_per_SFnsecs;    /* # of ticks in SF nsecs */

static hrtime_t apic_nsec_max;

static  hrtime_t    apic_last_hrtime = 0;
int     apic_hrtime_error = 0;
int     apic_remote_hrterr = 0;
int     apic_num_nmis = 0;
int     apic_apic_error = 0;
int     apic_num_apic_errors = 0;
int     apic_num_cksum_errors = 0;

int apic_error = 0;
static  int apic_cmos_ssb_set = 0;

/* use to make sure only one cpu handles the nmi */
static  lock_t  apic_nmi_lock;
/* use to make sure only one cpu handles the error interrupt */
static  lock_t  apic_error_lock;

static  struct {
    uchar_t cntl;
    uchar_t data;
} aspen_bmc[] = {
    { CC_SMS_WR_START,  0x18 },     /* NetFn/LUN */
    { CC_SMS_WR_NEXT,   0x24 },     /* Cmd SET_WATCHDOG_TIMER */
    { CC_SMS_WR_NEXT,   0x84 },     /* DataByte 1: SMS/OS no log */
    { CC_SMS_WR_NEXT,   0x2 },      /* DataByte 2: Power Down */
    { CC_SMS_WR_NEXT,   0x0 },      /* DataByte 3: no pre-timeout */
    { CC_SMS_WR_NEXT,   0x0 },      /* DataByte 4: timer expir. */
    { CC_SMS_WR_NEXT,   0xa },      /* DataByte 5: init countdown */
    { CC_SMS_WR_END,    0x0 },      /* DataByte 6: init countdown */

    { CC_SMS_WR_START,  0x18 },     /* NetFn/LUN */
    { CC_SMS_WR_END,    0x22 }      /* Cmd RESET_WATCHDOG_TIMER */
};

static  struct {
    int port;
    uchar_t data;
} sitka_bmc[] = {
    { SMS_COMMAND_REGISTER, SMS_WRITE_START },
    { SMS_DATA_REGISTER,    0x18 },     /* NetFn/LUN */
    { SMS_DATA_REGISTER,    0x24 },     /* Cmd SET_WATCHDOG_TIMER */
    { SMS_DATA_REGISTER,    0x84 },     /* DataByte 1: SMS/OS no log */
    { SMS_DATA_REGISTER,    0x2 },      /* DataByte 2: Power Down */
    { SMS_DATA_REGISTER,    0x0 },      /* DataByte 3: no pre-timeout */
    { SMS_DATA_REGISTER,    0x0 },      /* DataByte 4: timer expir. */
    { SMS_DATA_REGISTER,    0xa },      /* DataByte 5: init countdown */
    { SMS_COMMAND_REGISTER, SMS_WRITE_END },
    { SMS_DATA_REGISTER,    0x0 },      /* DataByte 6: init countdown */

    { SMS_COMMAND_REGISTER, SMS_WRITE_START },
    { SMS_DATA_REGISTER,    0x18 },     /* NetFn/LUN */
    { SMS_COMMAND_REGISTER, SMS_WRITE_END },
    { SMS_DATA_REGISTER,    0x22 }      /* Cmd RESET_WATCHDOG_TIMER */
};

/* Patchable global variables. */
int     apic_kmdb_on_nmi = 0;       /* 0 - no, 1 - yes enter kmdb */
uint32_t    apic_divide_reg_init = 0;   /* 0 - divide by 2 */

/*
 *  This is the loadable module wrapper
 */

int
_init(void)
{
    if (apic_coarse_hrtime)
        apic_ops.psm_gethrtime = &apic_gettime;
    return (psm_mod_init(&apic_hdlp, &apic_psm_info));
}

int
_fini(void)
{
    return (psm_mod_fini(&apic_hdlp, &apic_psm_info));
}

int
_info(struct modinfo *modinfop)
{
    return (psm_mod_info(&apic_hdlp, &apic_psm_info, modinfop));
}


static int
apic_probe()
{
    return (apic_probe_common(apic_psm_info.p_mach_idstring));
}

void
apic_init()
{
    int i;
    int j = 1;

    apic_ipltopri[0] = APIC_VECTOR_PER_IPL; /* leave 0 for idle */
    for (i = 0; i < (APIC_AVAIL_VECTOR / APIC_VECTOR_PER_IPL); i++) {
        if ((i < ((APIC_AVAIL_VECTOR / APIC_VECTOR_PER_IPL) - 1)) &&
            (apic_vectortoipl[i + 1] == apic_vectortoipl[i]))
            /* get to highest vector at the same ipl */
            continue;
        for (; j <= apic_vectortoipl[i]; j++) {
            apic_ipltopri[j] = (i << APIC_IPL_SHIFT) +
                APIC_BASE_VECT;
        }
    }
    for (; j < MAXIPL + 1; j++)
        /* fill up any empty ipltopri slots */
        apic_ipltopri[j] = (i << APIC_IPL_SHIFT) + APIC_BASE_VECT;
    apic_init_common();
#if defined(__amd64)
    /*
     * Make cpu-specific interrupt info point to cr8pri vector
     */
    for (i = 0; i <= MAXIPL; i++)
        apic_cr8pri[i] = apic_ipltopri[i] >> APIC_IPL_SHIFT;
    CPU->cpu_pri_data = apic_cr8pri;
#endif  /* __amd64 */
}

/*
 * handler for APIC Error interrupt. Just print a warning and continue
 */
static int
apic_error_intr()
{
    uint_t  error0, error1, error;
    uint_t  i;

    /*
     * We need to write before read as per 7.4.17 of system prog manual.
     * We do both and or the results to be safe
     */
    error0 = apicadr[APIC_ERROR_STATUS];
    apicadr[APIC_ERROR_STATUS] = 0;
    error1 = apicadr[APIC_ERROR_STATUS];
    error = error0 | error1;

    /*
     * Clear the APIC error status (do this on all cpus that enter here)
     * (two writes are required due to the semantics of accessing the
     * error status register.)
     */
    apicadr[APIC_ERROR_STATUS] = 0;
    apicadr[APIC_ERROR_STATUS] = 0;

    /*
     * Prevent more than 1 CPU from handling error interrupt causing
     * double printing (interleave of characters from multiple
     * CPU's when using prom_printf)
     */
    if (lock_try(&apic_error_lock) == 0)
        return (error ? DDI_INTR_CLAIMED : DDI_INTR_UNCLAIMED);
    if (error) {
#if DEBUG
        if (apic_debug)
            debug_enter("pcplusmp: APIC Error interrupt received");
#endif /* DEBUG */
        if (apic_panic_on_apic_error)
            cmn_err(CE_PANIC,
                "APIC Error interrupt on CPU %d. Status = %x\n",
                psm_get_cpu_id(), error);
        else {
            if ((error & ~APIC_CS_ERRORS) == 0) {
                /* cksum error only */
                apic_error |= APIC_ERR_APIC_ERROR;
                apic_apic_error |= error;
                apic_num_apic_errors++;
                apic_num_cksum_errors++;
            } else {
                /*
                 * prom_printf is the best shot we have of
                 * something which is problem free from
                 * high level/NMI type of interrupts
                 */
                prom_printf("APIC Error interrupt on CPU %d. "
                    "Status 0 = %x, Status 1 = %x\n",
                    psm_get_cpu_id(), error0, error1);
                apic_error |= APIC_ERR_APIC_ERROR;
                apic_apic_error |= error;
                apic_num_apic_errors++;
                for (i = 0; i < apic_error_display_delay; i++) {
                    tenmicrosec();
                }
                /*
                 * provide more delay next time limited to
                 * roughly 1 clock tick time
                 */
                if (apic_error_display_delay < 500)
                    apic_error_display_delay *= 2;
            }
        }
        lock_clear(&apic_error_lock);
        return (DDI_INTR_CLAIMED);
    } else {
        lock_clear(&apic_error_lock);
        return (DDI_INTR_UNCLAIMED);
    }
    /* NOTREACHED */
}

/*
 * Turn off the mask bit in the performance counter Local Vector Table entry.
 */
static void
apic_cpcovf_mask_clear(void)
{
    apicadr[APIC_PCINT_VECT] &= ~APIC_LVT_MASK;
}

static void
apic_init_intr()
{
    processorid_t   cpun = psm_get_cpu_id();

#if defined(__amd64)
    setcr8((ulong_t)(APIC_MASK_ALL >> APIC_IPL_SHIFT));
#else
    apicadr[APIC_TASK_REG] = APIC_MASK_ALL;
#endif

    if (apic_flat_model)
        apicadr[APIC_FORMAT_REG] = APIC_FLAT_MODEL;
    else
        apicadr[APIC_FORMAT_REG] = APIC_CLUSTER_MODEL;
    apicadr[APIC_DEST_REG] = AV_HIGH_ORDER >> cpun;

    /* need to enable APIC before unmasking NMI */
    apicadr[APIC_SPUR_INT_REG] = AV_UNIT_ENABLE | APIC_SPUR_INTR;

    apicadr[APIC_LOCAL_TIMER] = AV_MASK;
    apicadr[APIC_INT_VECT0] = AV_MASK;  /* local intr reg 0 */
    apicadr[APIC_INT_VECT1] = AV_NMI;   /* enable NMI */

    if (apic_cpus[cpun].aci_local_ver < APIC_INTEGRATED_VERS)
        return;

    /* Enable performance counter overflow interrupt */

    if ((x86_feature & X86_MSR) != X86_MSR)
        apic_enable_cpcovf_intr = 0;
    if (apic_enable_cpcovf_intr) {
        if (apic_cpcovf_vect == 0) {
            int ipl = APIC_PCINT_IPL;
            int irq = apic_get_ipivect(ipl, -1);

            ASSERT(irq != -1);
            apic_cpcovf_vect = apic_irq_table[irq]->airq_vector;
            ASSERT(apic_cpcovf_vect);
            (void) add_avintr(NULL, ipl,
                (avfunc)kcpc_hw_overflow_intr,
                "apic pcint", irq, NULL, NULL, NULL, NULL);
            kcpc_hw_overflow_intr_installed = 1;
            kcpc_hw_enable_cpc_intr = apic_cpcovf_mask_clear;
        }
        apicadr[APIC_PCINT_VECT] = apic_cpcovf_vect;
    }

    /* Enable error interrupt */

    if (apic_enable_error_intr) {
        if (apic_errvect == 0) {
            int ipl = 0xf;  /* get highest priority intr */
            int irq = apic_get_ipivect(ipl, -1);

            ASSERT(irq != -1);
            apic_errvect = apic_irq_table[irq]->airq_vector;
            ASSERT(apic_errvect);
            /*
             * Not PSMI compliant, but we are going to merge
             * with ON anyway
             */
            (void) add_avintr((void *)NULL, ipl,
                (avfunc)apic_error_intr, "apic error intr",
                irq, NULL, NULL, NULL, NULL);
        }
        apicadr[APIC_ERR_VECT] = apic_errvect;
        apicadr[APIC_ERROR_STATUS] = 0;
        apicadr[APIC_ERROR_STATUS] = 0;
    }
}

static void
apic_disable_local_apic()
{
    apicadr[APIC_TASK_REG] = APIC_MASK_ALL;
    apicadr[APIC_LOCAL_TIMER] = AV_MASK;
    apicadr[APIC_INT_VECT0] = AV_MASK;  /* local intr reg 0 */
    apicadr[APIC_INT_VECT1] = AV_MASK;  /* disable NMI */
    apicadr[APIC_ERR_VECT] = AV_MASK;   /* and error interrupt */
    apicadr[APIC_PCINT_VECT] = AV_MASK; /* and perf counter intr */
    apicadr[APIC_SPUR_INT_REG] = APIC_SPUR_INTR;
}

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

    /*
     * 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--) {
        if ((isr = apicadr[APIC_ISR_REG + (i * 4)]) != 0)
            for (j = 0; ((j < 32) && (isr != 0)); j++)
                if (isr & (1 << j)) {
                    apicadr[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_flag = 1;
    LOCK_INIT_CLEAR(&apic_gethrtime_lock);
    LOCK_INIT_CLEAR(&apic_ioapic_lock);
    LOCK_INIT_CLEAR(&apic_error_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,
        "pcplusmp NMI handler", (caddr_t)NULL))
        cmn_err(CE_WARN, "pcplusmp: Unable to add nmi handler");

    apic_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);
    }

    ioapic_init_intr(IOAPIC_MASK);
}


/*ARGSUSED1*/
static int
apic_cpu_start(processorid_t cpun, caddr_t arg)
{
    int     loop_count;
    uint32_t    vector;
    uint_t      cpu_id;
    ulong_t     iflag;

    cpu_id = apic_cpus[cpun].aci_local_id;

    apic_cmos_ssb_set = 1;

    /*
     * Interrupts on BSP cpu will be disabled during these startup
     * steps in order to avoid unwanted side effects from
     * executing interrupt handlers on a problematic BIOS.
     */

    iflag = intr_clear();
    outb(CMOS_ADDR, SSB);
    outb(CMOS_DATA, BIOS_SHUTDOWN);

    while (get_apic_cmd1() & AV_PENDING)
        apic_ret();

    /* for integrated - make sure there is one INIT IPI in buffer */
    /* for external - it will wake up the cpu */
    apicadr[APIC_INT_CMD2] = cpu_id << APIC_ICR_ID_BIT_OFFSET;
    apicadr[APIC_INT_CMD1] = AV_ASSERT | AV_RESET;

    /* If only 1 CPU is installed, PENDING bit will not go low */
    for (loop_count = 0x1000; loop_count; loop_count--)
        if (get_apic_cmd1() & AV_PENDING)
            apic_ret();
        else
            break;

    apicadr[APIC_INT_CMD2] = cpu_id << APIC_ICR_ID_BIT_OFFSET;
    apicadr[APIC_INT_CMD1] = AV_DEASSERT | AV_RESET;

    drv_usecwait(20000);        /* 20 milli sec */

    if (apic_cpus[cpun].aci_local_ver >= APIC_INTEGRATED_VERS) {
        /* integrated apic */

        vector = (rm_platter_pa >> MMU_PAGESHIFT) &
            (APIC_VECTOR_MASK | APIC_IPL_MASK);

        /* to offset the INIT IPI queue up in the buffer */
        apicadr[APIC_INT_CMD2] = cpu_id << APIC_ICR_ID_BIT_OFFSET;
        apicadr[APIC_INT_CMD1] = vector | AV_STARTUP;

        drv_usecwait(200);      /* 20 micro sec */

        apicadr[APIC_INT_CMD2] = cpu_id << APIC_ICR_ID_BIT_OFFSET;
        apicadr[APIC_INT_CMD1] = vector | AV_STARTUP;

        drv_usecwait(200);      /* 20 micro sec */
    }
    intr_restore(iflag);
    return (0);
}


#ifdef  DEBUG
int apic_break_on_cpu = 9;
int apic_stretch_interrupts = 0;
int apic_stretch_ISR = 1 << 3;  /* IPL of 3 matches nothing now */

void
apic_break()
{
}
#endif /* DEBUG */

/*
 * 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
 *
 */
/*ARGSUSED*/
static int
apic_intr_enter(int ipl, int *vectorp)
{
    uchar_t vector;
    int nipl;
    int irq;
    ulong_t iflag;
    apic_cpus_info_t *cpu_infop;

    /*
     * 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 = (uchar_t)*vectorp;

    /* if interrupted by the clock, increment apic_nsec_since_boot */
    if (vector == apic_clkvect) {
        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;
            apic_redistribute_compute();
        }

        /* We will avoid all the book keeping overhead for clock */
        nipl = apic_ipls[vector];

#if defined(__amd64)
        setcr8((ulong_t)apic_cr8pri[nipl]);
#else
        apicadr[APIC_TASK_REG] = apic_ipltopri[nipl];
#endif
        *vectorp = apic_vector_to_irq[vector + APIC_BASE_VECT];
        apicadr[APIC_EOI_REG] = 0;
        return (nipl);
    }

    cpu_infop = &apic_cpus[psm_get_cpu_id()];

    if (vector == (APIC_SPUR_INTR - APIC_BASE_VECT)) {
        cpu_infop->aci_spur_cnt++;
        return (APIC_INT_SPURIOUS);
    }

    /* Check if the vector we got is really what we need */
    if (apic_revector_pending) {
        /*
         * Disable interrupts for the duration of
         * the vector translation to prevent a self-race for
         * the apic_revector_lock.  This cannot be done
         * in apic_xlate_vector because it is recursive and
         * we want the vector translation to be atomic with
         * respect to other (higher-priority) interrupts.
         */
        iflag = intr_clear();
        vector = apic_xlate_vector(vector + APIC_BASE_VECT) -
            APIC_BASE_VECT;
        intr_restore(iflag);
    }

    nipl = apic_ipls[vector];
    *vectorp = irq = apic_vector_to_irq[vector + APIC_BASE_VECT];

#if defined(__amd64)
    setcr8((ulong_t)apic_cr8pri[nipl]);
#else
    apicadr[APIC_TASK_REG] = apic_ipltopri[nipl];
#endif

    cpu_infop->aci_current[nipl] = (uchar_t)irq;
    cpu_infop->aci_curipl = (uchar_t)nipl;
    cpu_infop->aci_ISR_in_progress |= 1 << nipl;

    /*
     * apic_level_intr could have been assimilated into the irq struct.
     * but, having it as a character array is more efficient in terms of
     * cache usage. So, we leave it as is.
     */
    if (!apic_level_intr[irq])
        apicadr[APIC_EOI_REG] = 0;

#ifdef  DEBUG
    APIC_DEBUG_BUF_PUT(vector);
    APIC_DEBUG_BUF_PUT(irq);
    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);

    if (apic_break_on_cpu == psm_get_cpu_id())
        apic_break();
#endif /* DEBUG */
    return (nipl);
}

void
apic_intr_exit(int prev_ipl, int irq)
{
    apic_cpus_info_t *cpu_infop;

#if defined(__amd64)
    setcr8((ulong_t)apic_cr8pri[prev_ipl]);
#else
    apicadr[APIC_TASK_REG] = apic_ipltopri[prev_ipl];
#endif

    cpu_infop = &apic_cpus[psm_get_cpu_id()];
    if (apic_level_intr[irq])
        apicadr[APIC_EOI_REG] = 0;

    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;
}

/*
 * Mask all interrupts below or equal to the given IPL
 */
static void
apic_setspl(int ipl)
{

#if defined(__amd64)
    setcr8((ulong_t)apic_cr8pri[ipl]);
#else
    apicadr[APIC_TASK_REG] = apic_ipltopri[ipl];
#endif

    /* interrupts at ipl above this cannot be in progress */
    apic_cpus[psm_get_cpu_id()].aci_ISR_in_progress &= (2 << ipl) - 1;
    /*
     * 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) get_apic_pri();
}

/*
 * trigger a software interrupt at the given IPL
 */
static void
apic_set_softintr(int ipl)
{
    int vector;
    ulong_t flag;

    vector = apic_resv_vector[ipl];

    flag = intr_clear();

    while (get_apic_cmd1() & AV_PENDING)
        apic_ret();

    /* generate interrupt at vector on itself only */
    apicadr[APIC_INT_CMD1] = AV_SH_SELF | vector;

    intr_restore(flag);
}

/*
 * generates an interprocessor interrupt to another CPU
 */
static void
apic_send_ipi(int cpun, int ipl)
{
    int vector;
    ulong_t flag;

    vector = apic_resv_vector[ipl];

    flag = intr_clear();

    while (get_apic_cmd1() & AV_PENDING)
        apic_ret();

    apicadr[APIC_INT_CMD2] =
        apic_cpus[cpun].aci_local_id << APIC_ICR_ID_BIT_OFFSET;
    apicadr[APIC_INT_CMD1] = vector;

    intr_restore(flag);
}


/*ARGSUSED*/
static void
apic_set_idlecpu(processorid_t cpun)
{
}

/*ARGSUSED*/
static void
apic_unset_idlecpu(processorid_t cpun)
{
}


static void
apic_ret()
{
}

static int
get_apic_cmd1()
{
    return (apicadr[APIC_INT_CMD1]);
}

static int
get_apic_pri()
{
#if defined(__amd64)
    return ((int)getcr8());
#else
    return (apicadr[APIC_TASK_REG]);
#endif
}

/*
 * If apic_coarse_time == 1, then apic_gettime() is used instead of
 * apic_gethrtime().  This is used for performance instead of accuracy.
 */

static hrtime_t
apic_gettime()
{
    int old_hrtime_stamp;
    hrtime_t temp;

    /*
     * In one-shot mode, we do not keep time, so if anyone
     * calls psm_gettime() directly, we vector over to
     * gethrtime().
     * one-shot mode MUST NOT be enabled if this psm is the source of
     * hrtime.
     */

    if (apic_oneshot)
        return (gethrtime());


gettime_again:
    while ((old_hrtime_stamp = apic_hrtime_stamp) & 1)
        apic_ret();

    temp = apic_nsec_since_boot;

    if (apic_hrtime_stamp != old_hrtime_stamp) {    /* got an interrupt */
        goto gettime_again;
    }
    return (temp);
}

/*
 * Here we return the number of nanoseconds since booting.  Note every
 * clock interrupt increments apic_nsec_since_boot by the appropriate
 * amount.
 */
static hrtime_t
apic_gethrtime()
{
    int curr_timeval, countval, elapsed_ticks;
    int old_hrtime_stamp, status;
    hrtime_t temp;
    uchar_t cpun;
    ulong_t oflags;

    /*
     * In one-shot mode, we do not keep time, so if anyone
     * calls psm_gethrtime() directly, we vector over to
     * gethrtime().
     * one-shot mode MUST NOT be enabled if this psm is the source of
     * hrtime.
     */

    if (apic_oneshot)
        return (gethrtime());

    oflags = intr_clear();  /* prevent migration */

    cpun = (uchar_t)((uint_t)apicadr[APIC_LID_REG] >> APIC_ID_BIT_OFFSET);

    lock_set(&apic_gethrtime_lock);

gethrtime_again:
    while ((old_hrtime_stamp = apic_hrtime_stamp) & 1)
        apic_ret();

    /*
     * Check to see which CPU we are on.  Note the time is kept on
     * the local APIC of CPU 0.  If on CPU 0, simply read the current
     * counter.  If on another CPU, issue a remote read command to CPU 0.
     */
    if (cpun == apic_cpus[0].aci_local_id) {
        countval = apicadr[APIC_CURR_COUNT];
    } else {
        while (get_apic_cmd1() & AV_PENDING)
            apic_ret();

        apicadr[APIC_INT_CMD2] =
            apic_cpus[0].aci_local_id << APIC_ICR_ID_BIT_OFFSET;
        apicadr[APIC_INT_CMD1] = APIC_CURR_ADD|AV_REMOTE;

        while ((status = get_apic_cmd1()) & AV_READ_PENDING)
            apic_ret();

        if (status & AV_REMOTE_STATUS)  /* 1 = valid */
            countval = apicadr[APIC_REMOTE_READ];
        else {  /* 0 = invalid */
            apic_remote_hrterr++;
            /*
             * return last hrtime right now, will need more
             * testing if change to retry
             */
            temp = apic_last_hrtime;

            lock_clear(&apic_gethrtime_lock);

            intr_restore(oflags);

            return (temp);
        }
    }
    if (countval > last_count_read)
        countval = 0;
    else
        last_count_read = countval;

    elapsed_ticks = apic_hertz_count - countval;

    curr_timeval = APIC_TICKS_TO_NSECS(elapsed_ticks);
    temp = apic_nsec_since_boot + curr_timeval;

    if (apic_hrtime_stamp != old_hrtime_stamp) {    /* got an interrupt */
        /* we might have clobbered last_count_read. Restore it */
        last_count_read = apic_hertz_count;
        goto gethrtime_again;
    }

    if (temp < apic_last_hrtime) {
        /* return last hrtime if error occurs */
        apic_hrtime_error++;
        temp = apic_last_hrtime;
    }
    else
        apic_last_hrtime = temp;

    lock_clear(&apic_gethrtime_lock);
    intr_restore(oflags);

    return (temp);
}

/* apic NMI handler */
/*ARGSUSED*/
static void
apic_nmi_intr(caddr_t arg)
{
    if (apic_shutdown_processors) {
        apic_disable_local_apic();
        return;
    }

    if (lock_try(&apic_nmi_lock)) {
        if (apic_kmdb_on_nmi) {
            if (psm_debugger() == 0) {
                cmn_err(CE_PANIC,
                    "NMI detected, kmdb is not available.");
            } else {
                debug_enter("\nNMI detected, entering kmdb.\n");
            }
        } else {
            if (apic_panic_on_nmi) {
                /* Keep panic from entering kmdb. */
                nopanicdebug = 1;
                cmn_err(CE_PANIC, "pcplusmp: NMI received");
            } else {
                /*
                 * prom_printf is the best shot we have
                 * of something which is problem free from
                 * high level/NMI type of interrupts
                 */
                prom_printf("pcplusmp: NMI received\n");
                apic_error |= APIC_ERR_NMI;
                apic_num_nmis++;
            }
        }
        lock_clear(&apic_nmi_lock);
    }
}

/*ARGSUSED*/
static int
apic_addspl(int irqno, int ipl, int min_ipl, int max_ipl)
{
    return (apic_addspl_common(irqno, ipl, min_ipl, max_ipl));
}

static int
apic_delspl(int irqno, int ipl, int min_ipl, int max_ipl)
{
    return (apic_delspl_common(irqno, ipl, min_ipl,  max_ipl));
}

/*
 * Return HW interrupt number corresponding to the given IPL
 */
/*ARGSUSED*/
static int
apic_softlvl_to_irq(int ipl)
{
    /*
     * Do not use apic to trigger soft interrupt.
     * It will cause the system to hang when 2 hardware interrupts
     * at the same priority with the softint are already accepted
     * by the apic.  Cause the AV_PENDING bit will not be cleared
     * until one of the hardware interrupt is eoi'ed.  If we need
     * to send an ipi at this time, we will end up looping forever
     * to wait for the AV_PENDING bit to clear.
     */
    return (PSM_SV_SOFTWARE);
}

static int
apic_post_cpu_start()
{
    int i, cpun;
    ulong_t iflag;
    apic_irq_t *irq_ptr;

    splx(ipltospl(LOCK_LEVEL));
    apic_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));

    while (get_apic_cmd1() & AV_PENDING)
        apic_ret();

    cpun = psm_get_cpu_id();
    apic_cpus[cpun].aci_status = APIC_CPU_ONLINE | APIC_CPU_INTR_ENABLE;

    for (i = apic_min_device_irq; i <= apic_max_device_irq; i++) {
        irq_ptr = apic_irq_table[i];
        if ((irq_ptr == NULL) ||
            ((irq_ptr->airq_cpu & ~IRQ_USER_BOUND) != cpun))
            continue;

        while (irq_ptr) {
            if (irq_ptr->airq_temp_cpu != IRQ_UNINIT) {
                iflag = intr_clear();
                lock_set(&apic_ioapic_lock);

                (void) apic_rebind(irq_ptr, cpun, NULL);

                lock_clear(&apic_ioapic_lock);
                intr_restore(iflag);
            }
            irq_ptr = irq_ptr->airq_next;
        }
    }

    apicadr[APIC_DIVIDE_REG] = apic_divide_reg_init;
    return (PSM_SUCCESS);
}

processorid_t
apic_get_next_processorid(processorid_t cpu_id)
{

    int i;

    if (cpu_id == -1)
        return ((processorid_t)0);

    for (i = cpu_id + 1; i < NCPU; i++) {
        if (CPU_IN_SET(apic_cpumask, i))
            return (i);
    }

    return ((processorid_t)-1);
}


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

    if (irq = apic_allocate_irq(APIC_VECTOR(ipl))) {
        if (vector = apic_allocate_vector(ipl, irq, 1)) {
            apic_irq_table[irq]->airq_mps_intr_index =
                RESERVE_INDEX;
            apic_irq_table[irq]->airq_vector = vector;
            if (type != -1) {
                apic_resv_vector[ipl] = vector;
            }
            return (irq);
        }
    }
    apic_error |= APIC_ERR_GET_IPIVECT_FAIL;
    return (-1);    /* shouldn't happen */
}

static int
apic_getclkirq(int ipl)
{
    int irq;

    if ((irq = apic_get_ipivect(ipl, -1)) == -1)
        return (-1);
    /*
     * Note the vector in apic_clkvect for per clock handling.
     */
    apic_clkvect = apic_irq_table[irq]->airq_vector - APIC_BASE_VECT;
    APIC_VERBOSE_IOAPIC((CE_NOTE, "get_clkirq: vector = %x\n",
        apic_clkvect));
    return (irq);
}


/*
 * Return the number of APIC clock ticks elapsed for 8245 to decrement
 * (APIC_TIME_COUNT + pit_ticks_adj) ticks.
 */
static uint_t
apic_calibrate(volatile uint32_t *addr, uint16_t *pit_ticks_adj)
{
    uint8_t     pit_tick_lo;
    uint16_t    pit_tick, target_pit_tick;
    uint32_t    start_apic_tick, end_apic_tick;
    ulong_t     iflag;

    addr += APIC_CURR_COUNT;

    iflag = intr_clear();

    do {
        pit_tick_lo = inb(PITCTR0_PORT);
        pit_tick = (inb(PITCTR0_PORT) << 8) | pit_tick_lo;
    } while (pit_tick < APIC_TIME_MIN ||
        pit_tick_lo <= APIC_LB_MIN || pit_tick_lo >= APIC_LB_MAX);

    /*
     * Wait for the 8254 to decrement by 5 ticks to ensure
     * we didn't start in the middle of a tick.
     * Compare with 0x10 for the wrap around case.
     */
    target_pit_tick = pit_tick - 5;
    do {
        pit_tick_lo = inb(PITCTR0_PORT);
        pit_tick = (inb(PITCTR0_PORT) << 8) | pit_tick_lo;
    } while (pit_tick > target_pit_tick || pit_tick_lo < 0x10);

    start_apic_tick = *addr;

    /*
     * Wait for the 8254 to decrement by
     * (APIC_TIME_COUNT + pit_ticks_adj) ticks
     */
    target_pit_tick = pit_tick - APIC_TIME_COUNT;
    do {
        pit_tick_lo = inb(PITCTR0_PORT);
        pit_tick = (inb(PITCTR0_PORT) << 8) | pit_tick_lo;
    } while (pit_tick > target_pit_tick || pit_tick_lo < 0x10);

    end_apic_tick = *addr;

    *pit_ticks_adj = target_pit_tick - pit_tick;

    intr_restore(iflag);

    return (start_apic_tick - end_apic_tick);
}

/*
 * Initialise the APIC timer on the local APIC of CPU 0 to the desired
 * frequency.  Note at this stage in the boot sequence, the boot processor
 * is the only active processor.
 * hertz value of 0 indicates a one-shot mode request.  In this case
 * the function returns the resolution (in nanoseconds) for the hardware
 * timer interrupt.  If one-shot mode capability is not available,
 * the return value will be 0. apic_enable_oneshot is a global switch
 * for disabling the functionality.
 * A non-zero positive value for hertz indicates a periodic mode request.
 * In this case the hardware will be programmed to generate clock interrupts
 * at hertz frequency and returns the resolution of interrupts in
 * nanosecond.
 */

static int
apic_clkinit(int hertz)
{

    uint_t      apic_ticks = 0;
    uint_t      pit_ticks;
    int     ret;
    uint16_t    pit_ticks_adj;
    static int  firsttime = 1;

    if (firsttime) {
        /* first time calibrate on CPU0 only */

        apicadr[APIC_DIVIDE_REG] = apic_divide_reg_init;
        apicadr[APIC_INIT_COUNT] = APIC_MAXVAL;
        apic_ticks = apic_calibrate(apicadr, &pit_ticks_adj);

        /* total number of PIT ticks corresponding to apic_ticks */
        pit_ticks = APIC_TIME_COUNT + pit_ticks_adj;

        /*
         * Determine the number of nanoseconds per APIC clock tick
         * and then determine how many APIC ticks to interrupt at the
         * desired frequency
         * apic_ticks / (pitticks / PIT_HZ) = apic_ticks_per_s
         * (apic_ticks * PIT_HZ) / pitticks = apic_ticks_per_s
         * apic_ticks_per_ns = (apic_ticks * PIT_HZ) / (pitticks * 10^9)
         * pic_ticks_per_SFns =
         *   (SF * apic_ticks * PIT_HZ) / (pitticks * 10^9)
         */
        apic_ticks_per_SFnsecs =
            ((SF * apic_ticks * PIT_HZ) /
            ((uint64_t)pit_ticks * NANOSEC));

        /* the interval timer initial count is 32 bit max */
        apic_nsec_max = APIC_TICKS_TO_NSECS(APIC_MAXVAL);
        firsttime = 0;
    }

    if (hertz != 0) {
        /* periodic */
        apic_nsec_per_intr = NANOSEC / hertz;
        apic_hertz_count = APIC_NSECS_TO_TICKS(apic_nsec_per_intr);
    }

    apic_int_busy_mark = (apic_int_busy_mark *
        apic_sample_factor_redistribution) / 100;
    apic_int_free_mark = (apic_int_free_mark *
        apic_sample_factor_redistribution) / 100;
    apic_diff_for_redistribution = (apic_diff_for_redistribution *
        apic_sample_factor_redistribution) / 100;

    if (hertz == 0) {
        /* requested one_shot */
        if (!apic_oneshot_enable)
            return (0);
        apic_oneshot = 1;
        ret = (int)APIC_TICKS_TO_NSECS(1);
    } else {
        /* program the local APIC to interrupt at the given frequency */
        apicadr[APIC_INIT_COUNT] = apic_hertz_count;
        apicadr[APIC_LOCAL_TIMER] =
            (apic_clkvect + APIC_BASE_VECT) | AV_TIME;
        apic_oneshot = 0;
        ret = NANOSEC / hertz;
    }

    return (ret);

}

/*
 * apic_preshutdown:
 * Called early in shutdown whilst we can still access filesystems to do
 * things like loading modules which will be required to complete shutdown
 * after filesystems are all unmounted.
 */
static void
apic_preshutdown(int cmd, int fcn)
{
    APIC_VERBOSE_POWEROFF(("apic_preshutdown(%d,%d); m=%d a=%d\n",
        cmd, fcn, apic_poweroff_method, apic_enable_acpi));

}

static void
apic_shutdown(int cmd, int fcn)
{
    int restarts, attempts;
    int i;
    uchar_t byte;
    ulong_t iflag;

    /* Send NMI to all CPUs except self to do per processor shutdown */
    iflag = intr_clear();
    while (get_apic_cmd1() & AV_PENDING)
        apic_ret();
    apic_shutdown_processors = 1;
    apicadr[APIC_INT_CMD1] = AV_NMI | AV_LEVEL | AV_SH_ALL_EXCSELF;

    /* restore cmos shutdown byte before reboot */
    if (apic_cmos_ssb_set) {
        outb(CMOS_ADDR, SSB);
        outb(CMOS_DATA, 0);
    }

    ioapic_disable_redirection();

    /*  disable 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_PIC);
    }

    apic_disable_local_apic();

    intr_restore(iflag);

    /* remainder of function is for shutdown cases only */
    if (cmd != A_SHUTDOWN)
        return;

    /* switch system back into Legacy Mode if using ACPI */
    if (apic_enable_acpi)
        (void) AcpiDisable();

    /* remainder of function is for shutdown+poweroff case only */
    if (fcn != AD_POWEROFF)
        return;

    switch (apic_poweroff_method) {
        case APIC_POWEROFF_VIA_RTC:

            /* select the extended NVRAM bank in the RTC */
            outb(CMOS_ADDR, RTC_REGA);
            byte = inb(CMOS_DATA);
            outb(CMOS_DATA, (byte | EXT_BANK));

            outb(CMOS_ADDR, PFR_REG);

            /* for Predator must toggle the PAB bit */
            byte = inb(CMOS_DATA);

            /*
             * clear power active bar, wakeup alarm and
             * kickstart
             */
            byte &= ~(PAB_CBIT | WF_FLAG | KS_FLAG);
            outb(CMOS_DATA, byte);

            /* delay before next write */
            drv_usecwait(1000);

            /* for S40 the following would suffice */
            byte = inb(CMOS_DATA);

            /* power active bar control bit */
            byte |= PAB_CBIT;
            outb(CMOS_DATA, byte);

            break;

        case APIC_POWEROFF_VIA_ASPEN_BMC:
            restarts = 0;
restart_aspen_bmc:
            if (++restarts == 3)
                break;
            attempts = 0;
            do {
                byte = inb(MISMIC_FLAG_REGISTER);
                byte &= MISMIC_BUSY_MASK;
                if (byte != 0) {
                    drv_usecwait(1000);
                    if (attempts >= 3)
                        goto restart_aspen_bmc;
                    ++attempts;
                }
            } while (byte != 0);
            outb(MISMIC_CNTL_REGISTER, CC_SMS_GET_STATUS);
            byte = inb(MISMIC_FLAG_REGISTER);
            byte |= 0x1;
            outb(MISMIC_FLAG_REGISTER, byte);
            i = 0;
            for (; i < (sizeof (aspen_bmc)/sizeof (aspen_bmc[0]));
                i++) {
                attempts = 0;
                do {
                    byte = inb(MISMIC_FLAG_REGISTER);
                    byte &= MISMIC_BUSY_MASK;
                    if (byte != 0) {
                        drv_usecwait(1000);
                        if (attempts >= 3)
                            goto restart_aspen_bmc;
                        ++attempts;
                    }
                } while (byte != 0);
                outb(MISMIC_CNTL_REGISTER, aspen_bmc[i].cntl);
                outb(MISMIC_DATA_REGISTER, aspen_bmc[i].data);
                byte = inb(MISMIC_FLAG_REGISTER);
                byte |= 0x1;
                outb(MISMIC_FLAG_REGISTER, byte);
            }
            break;

        case APIC_POWEROFF_VIA_SITKA_BMC:
            restarts = 0;
restart_sitka_bmc:
            if (++restarts == 3)
                break;
            attempts = 0;
            do {
                byte = inb(SMS_STATUS_REGISTER);
                byte &= SMS_STATE_MASK;
                if ((byte == SMS_READ_STATE) ||
                    (byte == SMS_WRITE_STATE)) {
                    drv_usecwait(1000);
                    if (attempts >= 3)
                        goto restart_sitka_bmc;
                    ++attempts;
                }
            } while ((byte == SMS_READ_STATE) ||
                (byte == SMS_WRITE_STATE));
            outb(SMS_COMMAND_REGISTER, SMS_GET_STATUS);
            i = 0;
            for (; i < (sizeof (sitka_bmc)/sizeof (sitka_bmc[0]));
                i++) {
                attempts = 0;
                do {
                    byte = inb(SMS_STATUS_REGISTER);
                    byte &= SMS_IBF_MASK;
                    if (byte != 0) {
                        drv_usecwait(1000);
                        if (attempts >= 3)
                            goto restart_sitka_bmc;
                        ++attempts;
                    }
                } while (byte != 0);
                outb(sitka_bmc[i].port, sitka_bmc[i].data);
            }
            break;

        case APIC_POWEROFF_NONE:

            /* If no APIC direct method, we will try using ACPI */
            if (apic_enable_acpi) {
                if (acpi_poweroff() == 1)
                    return;
            } else
                return;

            break;
    }
    /*
     * Wait a limited time here for power to go off.
     * If the power does not go off, then there was a
     * problem and we should continue to the halt which
     * prints a message for the user to press a key to
     * reboot.
     */
    drv_usecwait(7000000); /* wait seven seconds */

}

/*
 * 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
apic_disable_intr(processorid_t cpun)
{
    int bind_cpu = 0, i, hardbound = 0;
    apic_irq_t *irq_ptr;
    ulong_t iflag;

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

    for (i = 0; i <= APIC_MAX_VECTOR; i++) {
        if (apic_reprogram_info[i].done == B_FALSE) {
            if (apic_reprogram_info[i].bindcpu == cpun) {
                /*
                 * CPU is busy -- it's the target of
                 * a pending reprogramming attempt
                 */
                lock_clear(&apic_ioapic_lock);
                intr_restore(iflag);
                return (PSM_FAILURE);
            }
        }
    }

    apic_cpus[cpun].aci_status &= ~APIC_CPU_INTR_ENABLE;

    apic_cpus[cpun].aci_curipl = 0;

    i = apic_min_device_irq;
    for (; i <= apic_max_device_irq; i++) {
        /*
         * If there are bound interrupts on this cpu, then
         * rebind them to other processors.
         */
        if ((irq_ptr = apic_irq_table[i]) != NULL) {
            ASSERT((irq_ptr->airq_temp_cpu == IRQ_UNBOUND) ||
                (irq_ptr->airq_temp_cpu == IRQ_UNINIT) ||
                ((irq_ptr->airq_temp_cpu & ~IRQ_USER_BOUND) <
                apic_nproc));

            if (irq_ptr->airq_temp_cpu == (cpun | IRQ_USER_BOUND)) {
                hardbound = 1;
                continue;
            }

            if (irq_ptr->airq_temp_cpu == cpun) {
                do {
                    bind_cpu = apic_next_bind_cpu++;
                    if (bind_cpu >= apic_nproc) {
                        apic_next_bind_cpu = 1;
                        bind_cpu = 0;

                    }
                } while (apic_rebind_all(irq_ptr, bind_cpu));
            }
        }
    }

    lock_clear(&apic_ioapic_lock);
    intr_restore(iflag);

    if (hardbound) {
        cmn_err(CE_WARN, "Could not disable interrupts on %d"
            "due to user bound interrupts", cpun);
        return (PSM_FAILURE);
    }
    else
        return (PSM_SUCCESS);
}

static void
apic_enable_intr(processorid_t cpun)
{
    int i;
    apic_irq_t *irq_ptr;
    ulong_t iflag;

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

    apic_cpus[cpun].aci_status |= APIC_CPU_INTR_ENABLE;

    i = apic_min_device_irq;
    for (i = apic_min_device_irq; i <= apic_max_device_irq; i++) {
        if ((irq_ptr = apic_irq_table[i]) != NULL) {
            if ((irq_ptr->airq_cpu & ~IRQ_USER_BOUND) == cpun) {
                (void) apic_rebind_all(irq_ptr,
                    irq_ptr->airq_cpu);
            }
        }
    }

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


/*
 * This function will reprogram the timer.
 *
 * When in oneshot mode the argument is the absolute time in future to
 * generate the interrupt at.
 *
 * When in periodic mode, the argument is the interval at which the
 * interrupts should be generated. There is no need to support the periodic
 * mode timer change at this time.
 */
static void
apic_timer_reprogram(hrtime_t time)
{
    hrtime_t now;
    uint_t ticks;
    int64_t delta;

    /*
     * We should be called from high PIL context (CBE_HIGH_PIL),
     * so kpreempt is disabled.
     */

    if (!apic_oneshot) {
        /* time is the interval for periodic mode */
        ticks = APIC_NSECS_TO_TICKS(time);
    } else {
        /* one shot mode */

        now = gethrtime();
        delta = time - now;

        if (delta <= 0) {
            /*
             * requested to generate an interrupt in the past
             * generate an interrupt as soon as possible
             */
            ticks = apic_min_timer_ticks;
        } else if (delta > apic_nsec_max) {
            /*
             * requested to generate an interrupt at a time
             * further than what we are capable of. Set to max
             * the hardware can handle
             */

            ticks = APIC_MAXVAL;
#ifdef DEBUG
            cmn_err(CE_CONT, "apic_timer_reprogram, request at"
                "  %lld  too far in future, current time"
                "  %lld \n", time, now);
#endif
        } else
            ticks = APIC_NSECS_TO_TICKS(delta);
    }

    if (ticks < apic_min_timer_ticks)
        ticks = apic_min_timer_ticks;

    apicadr[APIC_INIT_COUNT] = ticks;

}

/*
 * This function will enable timer interrupts.
 */
static void
apic_timer_enable(void)
{
    /*
     * We should be Called from high PIL context (CBE_HIGH_PIL),
     * so kpreempt is disabled.
     */

    if (!apic_oneshot)
        apicadr[APIC_LOCAL_TIMER] =
            (apic_clkvect + APIC_BASE_VECT) | AV_TIME;
    else {
        /* one shot */
        apicadr[APIC_LOCAL_TIMER] = (apic_clkvect + APIC_BASE_VECT);
    }
}

/*
 * This function will disable timer interrupts.
 */
static void
apic_timer_disable(void)
{
    /*
     * We should be Called from high PIL context (CBE_HIGH_PIL),
     * so kpreempt is disabled.
     */

    apicadr[APIC_LOCAL_TIMER] = (apic_clkvect + APIC_BASE_VECT) | AV_MASK;
}


cyclic_id_t apic_cyclic_id;

/*
 * If this module needs to be a consumer of cyclic subsystem, they
 * can be added here, since at this time kernel cyclic subsystem is initialized
 * argument is not currently used, and is reserved for future.
 */
static void
apic_post_cyclic_setup(void *arg)
{
_NOTE(ARGUNUSED(arg))
    cyc_handler_t hdlr;
    cyc_time_t when;

    /* cpu_lock is held */

    /* set up cyclics for intr redistribution */

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

    hdlr.cyh_level = CY_LOW_LEVEL;
    hdlr.cyh_func = (cyc_func_t)apic_redistribute_compute;
    hdlr.cyh_arg = NULL;

    when.cyt_when = 0;
    when.cyt_interval = apic_redistribute_sample_interval;
    apic_cyclic_id = cyclic_add(&hdlr, &when);


}

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

    if (apic_enable_dynamic_migration) {
        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++) {

            /*
             * 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 irq;
                apic_cpus[i].aci_busy++;
                irq = apic_cpus[i].aci_current[j];
                apic_irq_table[irq]->airq_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.
             */
                if (apic_skipped_redistribute) {
                    apic_cleanup_busy();
                    apic_skipped_redistribute = 0;
                } else {
                    apic_intr_redistribute();
                }
            } else
                apic_skipped_redistribute++;
        }
    }
}


/*
 * The following functions are in the platform specific file so that they
 * can be different functions depending on whether we are running on
 * bare metal or a hypervisor.
 */

/*
 * map an apic for memory-mapped access
 */
uint32_t *
mapin_apic(uint32_t addr, size_t len, int flags)
{
    /*LINTED: pointer cast may result in improper alignment */
    return ((uint32_t *)psm_map_phys(addr, len, flags));
}

uint32_t *
mapin_ioapic(uint32_t addr, size_t len, int flags)
{
    return (mapin_apic(addr, len, flags));
}

/*
 * unmap an apic
 */
void
mapout_apic(caddr_t addr, size_t len)
{
    psm_unmap_phys(addr, len);
}

void
mapout_ioapic(caddr_t addr, size_t len)
{
    mapout_apic(addr, len);
}

/*
 * This function allocate "count" vector(s) for the given "dip/pri/type"
 */
int
apic_alloc_vectors(dev_info_t *dip, int inum, int count, int pri, int type,
    int behavior)
{
    int rcount, i;
    uchar_t start, irqno, cpu;
    major_t major;
    apic_irq_t  *irqptr;

    /* only supports MSI at the moment, will add MSI-X support later */
    if (type != DDI_INTR_TYPE_MSI)
        return (0);

    DDI_INTR_IMPLDBG((CE_CONT, "apic_alloc_vectors: dip=0x%p type=%d "
        "inum=0x%x  pri=0x%x count=0x%x behavior=%d\n",
        (void *)dip, type, inum, pri, count, behavior));

    if (count > 1) {
        if (behavior == DDI_INTR_ALLOC_STRICT &&
            (apic_multi_msi_enable == 0 || count > apic_multi_msi_max))
            return (0);

        if (apic_multi_msi_enable == 0)
            count = 1;
        else if (count > apic_multi_msi_max)
            count = apic_multi_msi_max;
    }

    if ((rcount = apic_navail_vector(dip, pri)) > count)
        rcount = count;
    else if (rcount == 0 || (rcount < count &&
        behavior == DDI_INTR_ALLOC_STRICT))
        return (0);

    /* if not ISP2, then round it down */
    if (!ISP2(rcount))
        rcount = 1 << (highbit(rcount) - 1);

    mutex_enter(&airq_mutex);

    for (start = 0; rcount > 0; rcount >>= 1) {
        if ((start = apic_find_multi_vectors(pri, rcount)) != 0 ||
            behavior == DDI_INTR_ALLOC_STRICT)
            break;
    }

    if (start == 0) {
        /* no vector available */
        mutex_exit(&airq_mutex);
        return (0);
    }

    major = (dip != NULL) ? ddi_name_to_major(ddi_get_name(dip)) : 0;
    for (i = 0; i < rcount; i++) {
        if ((irqno = apic_allocate_irq(apic_first_avail_irq)) ==
            (uchar_t)-1) {
            mutex_exit(&airq_mutex);
            DDI_INTR_IMPLDBG((CE_CONT, "apic_alloc_vectors: "
                "apic_allocate_irq failed\n"));
            return (i);
        }
        apic_max_device_irq = max(irqno, apic_max_device_irq);
        apic_min_device_irq = min(irqno, apic_min_device_irq);
        irqptr = apic_irq_table[irqno];
#ifdef  DEBUG
        if (apic_vector_to_irq[start + i] != APIC_RESV_IRQ)
            DDI_INTR_IMPLDBG((CE_CONT, "apic_alloc_vectors: "
                "apic_vector_to_irq is not APIC_RESV_IRQ\n"));
#endif
        apic_vector_to_irq[start + i] = (uchar_t)irqno;

        irqptr->airq_vector = (uchar_t)(start + i);
        irqptr->airq_ioapicindex = (uchar_t)inum;   /* start */
        irqptr->airq_intin_no = (uchar_t)rcount;
        irqptr->airq_ipl = pri;
        irqptr->airq_vector = start + i;
        irqptr->airq_origirq = (uchar_t)(inum + i);
        irqptr->airq_share_id = 0;
        irqptr->airq_mps_intr_index = MSI_INDEX;
        irqptr->airq_dip = dip;
        irqptr->airq_major = major;
        if (i == 0) /* they all bound to the same cpu */
            cpu = irqptr->airq_cpu = apic_bind_intr(dip, irqno,
                0xff, 0xff);
        else
            irqptr->airq_cpu = cpu;
        DDI_INTR_IMPLDBG((CE_CONT, "apic_alloc_vectors: irq=0x%x "
            "dip=0x%p vector=0x%x origirq=0x%x pri=0x%x\n", irqno,
            (void *)irqptr->airq_dip, irqptr->airq_vector,
            irqptr->airq_origirq, pri));
    }
    mutex_exit(&airq_mutex);
    return (rcount);
}

/*
 * Allocate a free vector for irq at ipl. Takes care of merging of multiple
 * IPLs into a single APIC level as well as stretching some IPLs onto multiple
 * levels. APIC_HI_PRI_VECTS interrupts are reserved for high priority
 * requests and allocated only when pri is set.
 */
uchar_t
apic_allocate_vector(int ipl, int irq, int pri)
{
    int lowest, highest, i;

    highest = apic_ipltopri[ipl] + APIC_VECTOR_MASK;
    lowest = apic_ipltopri[ipl - 1] + APIC_VECTOR_PER_IPL;

    if (highest < lowest) /* Both ipl and ipl - 1 map to same pri */
        lowest -= APIC_VECTOR_PER_IPL;

#ifdef  DEBUG
    if (apic_restrict_vector)   /* for testing shared interrupt logic */
        highest = lowest + apic_restrict_vector + APIC_HI_PRI_VECTS;
#endif /* DEBUG */
    if (pri == 0)
        highest -= APIC_HI_PRI_VECTS;

    for (i = lowest; i < highest; i++) {
        if (APIC_CHECK_RESERVE_VECTORS(i))
            continue;
        if (apic_vector_to_irq[i] == APIC_RESV_IRQ) {
            apic_vector_to_irq[i] = (uchar_t)irq;
            return (i);
        }
    }

    return (0);
}

/* Mark vector as not being used by any irq */
void
apic_free_vector(uchar_t vector)
{
    apic_vector_to_irq[vector] = APIC_RESV_IRQ;
}

uint32_t
ioapic_read(int ioapic_ix, uint32_t reg)
{
    volatile uint32_t *ioapic;

    ioapic = apicioadr[ioapic_ix];
    ioapic[APIC_IO_REG] = reg;
    return (ioapic[APIC_IO_DATA]);
}

void
ioapic_write(int ioapic_ix, uint32_t reg, uint32_t value)
{
    volatile uint32_t *ioapic;

    ioapic = apicioadr[ioapic_ix];
    ioapic[APIC_IO_REG] = reg;
    ioapic[APIC_IO_DATA] = value;
}

static processorid_t
apic_find_cpu(int flag)
{
    processorid_t acid = 0;
    int i;

    /* Find the first CPU with the passed-in flag set */
    for (i = 0; i < apic_nproc; i++) {
        if (apic_cpus[i].aci_status & flag) {
            acid = i;
            break;
        }
    }

    ASSERT((apic_cpus[acid].aci_status & flag) != 0);
    return (acid);
}

/*
 * Call rebind to do the actual programming.
 * Must be called with interrupts disabled and apic_ioapic_lock held
 * 'p' is polymorphic -- if this function is called to process a deferred
 * reprogramming, p is of type 'struct ioapic_reprogram_data *', from which
 * the irq pointer is retrieved.  If not doing deferred reprogramming,
 * p is of the type 'apic_irq_t *'.
 *
 * apic_ioapic_lock must be held across this call, as it protects apic_rebind
 * and it protects apic_find_cpu() from a race in which a CPU can be taken
 * offline after a cpu is selected, but before apic_rebind is called to
 * bind interrupts to it.
 */
int
apic_setup_io_intr(void *p, int irq, boolean_t deferred)
{
    apic_irq_t *irqptr;
    struct ioapic_reprogram_data *drep = NULL;
    int rv;

    if (deferred) {
        drep = (struct ioapic_reprogram_data *)p;
        ASSERT(drep != NULL);
        irqptr = drep->irqp;
    } else
        irqptr = (apic_irq_t *)p;

    ASSERT(irqptr != NULL);

    rv = apic_rebind(irqptr, apic_irq_table[irq]->airq_cpu, drep);
    if (rv) {
        /*
         * CPU is not up or interrupts are disabled. Fall back to
         * the first available CPU
         */
        rv = apic_rebind(irqptr, apic_find_cpu(APIC_CPU_INTR_ENABLE),
            drep);
    }

    return (rv);
}


uchar_t
apic_modify_vector(uchar_t vector, int irq)
{
    apic_vector_to_irq[vector] = (uchar_t)irq;
    return (vector);
}