sun4v/os/mach_cpu_states.c

	mach_cpu_states.c revision fa9e4066f08beec538e775443c5be79dd423fcab
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <sys/types.h>
#include <sys/systm.h>
#include <sys/archsystm.h>
#include <sys/t_lock.h>
#include <sys/uadmin.h>
#include <sys/panic.h>
#include <sys/reboot.h>
#include <sys/autoconf.h>
#include <sys/machsystm.h>
#include <sys/promif.h>
#include <sys/membar.h>
#include <vm/hat_sfmmu.h>
#include <sys/cpu_module.h>
#include <sys/cpu_sgnblk_defs.h>
#include <sys/intreg.h>
#include <sys/consdev.h>
#include <sys/kdi_impl.h>
#include <sys/hypervisor_api.h>
#include <sys/vmsystm.h>
#include <sys/dtrace.h>
#include <sys/xc_impl.h>
#include <sys/callb.h>

/*
 * hvdump_buf_va is a pointer to the currently-configured hvdump_buf.
 * A value of NULL indicates that this area is not configured.
 * hvdump_buf_sz is tunable but will be clamped to HVDUMP_SIZE_MAX.
 */

caddr_t hvdump_buf_va;
uint64_t hvdump_buf_sz = HVDUMP_SIZE_DEFAULT;
static uint64_t hvdump_buf_pa;


#ifdef  TRAPTRACE
#include <sys/traptrace.h>
#include <sys/hypervisor_api.h>
u_longlong_t panic_tick;
#endif /* TRAPTRACE */

extern u_longlong_t gettick();
static void reboot_machine(char *);
static void update_hvdump_buffer(void);

/*
 * For xt_sync synchronization.
 */
extern uint64_t xc_tick_limit;
extern uint64_t xc_tick_jump_limit;

/*
 * We keep our own copies, used for cache flushing, because we can be called
 * before cpu_fiximpl().
 */
static int kdi_dcache_size;
static int kdi_dcache_linesize;
static int kdi_icache_size;
static int kdi_icache_linesize;

/*
 * Assembly support for generic modules in sun4v/ml/mach_xc.s
 */
extern void init_mondo_nocheck(xcfunc_t *func, uint64_t arg1, uint64_t arg2);
extern void kdi_flush_idcache(int, int, int, int);
extern uint64_t get_cpuaddr(uint64_t, uint64_t);

/*
 * Machine dependent code to reboot.
 * "mdep" is interpreted as a character pointer; if non-null, it is a pointer
 * to a string to be used as the argument string when rebooting.
 *
 * "invoke_cb" is a boolean. It is set to true when mdboot() can safely
 * invoke CB_CL_MDBOOT callbacks before shutting the system down, i.e. when
 * we are in a normal shutdown sequence (interrupts are not blocked, the
 * system is not panic'ing or being suspended).
 */
/*ARGSUSED*/
void
mdboot(int cmd, int fcn, char *bootstr, boolean_t invoke_cb)
{
    page_t *first, *pp;
    extern void pm_cfb_check_and_powerup(void);

    /*
     * Clear any unresolved UEs from memory.  We rely on the fact that on
     * sun4u, pagezero() will always clear UEs.  Since we're rebooting, we
     * just force p_selock to appear locked so pagezero()'s assert works.
     *
     * Pages that were retired successfully due to multiple CEs will
     * also be cleared.
     */
    if (memsegs != NULL) {
        pp = first = page_first();
        do {
            if (page_isretired(pp) || page_istoxic(pp)) {
                /* pagezero asserts PAGE_LOCKED */
                pp->p_selock = -1;
                pagezero(pp, 0, PAGESIZE);
            }
        } while ((pp = page_next(pp)) != first);
    }

    /*
     * XXX - rconsvp is set to NULL to ensure that output messages
     * are sent to the underlying "hardware" device using the
     * monitor's printf routine since we are in the process of
     * either rebooting or halting the machine.
     */
    rconsvp = NULL;

    /*
     * At a high interrupt level we can't:
     *  1) bring up the console
     * or
     *  2) wait for pending interrupts prior to redistribution
     *     to the current CPU
     *
     * so we do them now.
     */
    pm_cfb_check_and_powerup();

    /* make sure there are no more changes to the device tree */
    devtree_freeze();

    if (invoke_cb)
        (void) callb_execute_class(CB_CL_MDBOOT, NULL);

    /*
     * stop other cpus which also raise our priority. since there is only
     * one active cpu after this, and our priority will be too high
     * for us to be preempted, we're essentially single threaded
     * from here on out.
     */
    stop_other_cpus();

    /*
     * try and reset leaf devices.  reset_leaves() should only
     * be called when there are no other threads that could be
     * accessing devices
     */
    reset_leaves();

    if (fcn == AD_HALT) {
        halt((char *)NULL);
    } else if (fcn == AD_POWEROFF) {
        power_down(NULL);
    } else {
        if (bootstr == NULL) {
            switch (fcn) {

            case AD_BOOT:
                bootstr = "";
                break;

            case AD_IBOOT:
                bootstr = "-a";
                break;

            case AD_SBOOT:
                bootstr = "-s";
                break;

            case AD_SIBOOT:
                bootstr = "-sa";
                break;
            default:
                cmn_err(CE_WARN,
                    "mdboot: invalid function %d", fcn);
                bootstr = "";
                break;
            }
        }
        reboot_machine(bootstr);
    }
    /* MAYBE REACHED */
}

/* mdpreboot - may be called prior to mdboot while root fs still mounted */
/*ARGSUSED*/
void
mdpreboot(int cmd, int fcn, char *bootstr)
{
}

/*
 * Halt the machine and then reboot with the device
 * and arguments specified in bootstr.
 */
static void
reboot_machine(char *bootstr)
{
    flush_windows();
    stop_other_cpus();      /* send stop signal to other CPUs */
    prom_printf("rebooting...\n");
    /*
     * For platforms that use CPU signatures, we
     * need to set the signature block to OS and
     * the state to exiting for all the processors.
     */
    CPU_SIGNATURE(OS_SIG, SIGST_EXIT, SIGSUBST_REBOOT, -1);
    prom_reboot(bootstr);
    /*NOTREACHED*/
}

/*
 * We use the x-trap mechanism and idle_stop_xcall() to stop the other CPUs.
 * Once in panic_idle() they raise spl, record their location, and spin.
 */
static void
panic_idle(void)
{
    (void) spl7();

    debug_flush_windows();
    (void) setjmp(&curthread->t_pcb);

    CPU->cpu_m.in_prom = 1;
    membar_stld();

    for (;;);
}

/*
 * Force the other CPUs to trap into panic_idle(), and then remove them
 * from the cpu_ready_set so they will no longer receive cross-calls.
 */
/*ARGSUSED*/
void
panic_stopcpus(cpu_t *cp, kthread_t *t, int spl)
{
    cpuset_t cps;
    int i;

    (void) splzs();
    CPUSET_ALL_BUT(cps, cp->cpu_id);
    xt_some(cps, (xcfunc_t *)idle_stop_xcall, (uint64_t)&panic_idle, NULL);

    for (i = 0; i < NCPU; i++) {
        if (i != cp->cpu_id && CPU_XCALL_READY(i)) {
            int ntries = 0x10000;

            while (!cpu[i]->cpu_m.in_prom && ntries) {
                DELAY(50);
                ntries--;
            }

            if (!cpu[i]->cpu_m.in_prom)
                printf("panic: failed to stop cpu%d\n", i);

            cpu[i]->cpu_flags &= ~CPU_READY;
            cpu[i]->cpu_flags |= CPU_QUIESCED;
            CPUSET_DEL(cpu_ready_set, cpu[i]->cpu_id);
        }
    }
}

/*
 * Platform callback following each entry to panicsys().  If we've panicked at
 * level 14, we examine t_panic_trap to see if a fatal trap occurred.  If so,
 * we disable further %tick_cmpr interrupts.  If not, an explicit call to panic
 * was made and so we re-enqueue an interrupt request structure to allow
 * further level 14 interrupts to be processed once we lower PIL.  This allows
 * us to handle panics from the deadman() CY_HIGH_LEVEL cyclic.
 */
void
panic_enter_hw(int spl)
{
#ifdef TRAPTRACE
    if (!panic_tick) {
        uint64_t prev_freeze;

        panic_tick = gettick();
        /*  there are no possible error codes for this hcall */
        (void) hv_ttrace_freeze((uint64_t)TRAP_TFREEZE_ALL,
            &prev_freeze);
        TRAPTRACE_FREEZE;
    }
#endif

    if (spl == ipltospl(PIL_14)) {
        uint_t opstate = disable_vec_intr();

        if (curthread->t_panic_trap != NULL) {
            tickcmpr_disable();
            intr_dequeue_req(PIL_14, cbe_level14_inum);
        } else {
            if (!tickcmpr_disabled())
                intr_enqueue_req(PIL_14, cbe_level14_inum);
            /*
             * Clear SOFTINT<14>, SOFTINT<0> (TICK_INT)
             * and SOFTINT<16> (STICK_INT) to indicate
             * that the current level 14 has been serviced.
             */
            wr_clr_softint((1 << PIL_14) |
                TICK_INT_MASK | STICK_INT_MASK);
        }

        enable_vec_intr(opstate);
    }
}

/*
 * Miscellaneous hardware-specific code to execute after panicstr is set
 * by the panic code: we also print and record PTL1 panic information here.
 */
/*ARGSUSED*/
void
panic_quiesce_hw(panic_data_t *pdp)
{
    extern uint_t getpstate(void);
    extern void setpstate(uint_t);

#ifdef TRAPTRACE
    uint64_t prev_freeze;
    /*
     * Turn off TRAPTRACE and save the current %tick value in panic_tick.
     */
    if (!panic_tick)
        panic_tick = gettick();
    /*  there are no possible error codes for this hcall */
    (void) hv_ttrace_freeze((uint64_t)TRAP_TFREEZE_ALL, &prev_freeze);
    TRAPTRACE_FREEZE;
#endif
    /*
     * For Platforms that use CPU signatures, we
     * need to set the signature block to OS, the state to
     * exiting, and the substate to panic for all the processors.
     */
    CPU_SIGNATURE(OS_SIG, SIGST_EXIT, SIGSUBST_PANIC, -1);

    update_hvdump_buffer();

    /*
     * Disable further ECC errors from the bus nexus.
     */
    (void) bus_func_invoke(BF_TYPE_ERRDIS);

    /*
     * Redirect all interrupts to the current CPU.
     */
    intr_redist_all_cpus_shutdown();

    /*
     * This call exists solely to support dumps to network
     * devices after sync from OBP.
     *
     * If we came here via the sync callback, then on some
     * platforms, interrupts may have arrived while we were
     * stopped in OBP.  OBP will arrange for those interrupts to
     * be redelivered if you say "go", but not if you invoke a
     * client callback like 'sync'.  For some dump devices
     * (network swap devices), we need interrupts to be
     * delivered in order to dump, so we have to call the bus
     * nexus driver to reset the interrupt state machines.
     */
    (void) bus_func_invoke(BF_TYPE_RESINTR);

    setpstate(getpstate() | PSTATE_IE);
}

/*
 * Platforms that use CPU signatures need to set the signature block to OS and
 * the state to exiting for all CPUs. PANIC_CONT indicates that we're about to
 * write the crash dump, which tells the SSP/SMS to begin a timeout routine to
 * reboot the machine if the dump never completes.
 */
/*ARGSUSED*/
void
panic_dump_hw(int spl)
{
    CPU_SIGNATURE(OS_SIG, SIGST_EXIT, SIGSUBST_DUMP, -1);
}

/*
 * for ptl1_panic
 */
void
ptl1_init_cpu(struct cpu *cpu)
{
    ptl1_state_t *pstate = &cpu->cpu_m.ptl1_state;

    /*CONSTCOND*/
    if (sizeof (struct cpu) + PTL1_SSIZE > CPU_ALLOC_SIZE) {
        panic("ptl1_init_cpu: not enough space left for ptl1_panic "
            "stack, sizeof (struct cpu) = %d", sizeof (struct cpu));
    }

    pstate->ptl1_stktop = (uintptr_t)cpu + CPU_ALLOC_SIZE;
    cpu_pa[cpu->cpu_id] = va_to_pa(cpu);
}

void
ptl1_panic_handler(ptl1_state_t *pstate)
{
    static const char *ptl1_reasons[] = {
#ifdef  PTL1_PANIC_DEBUG
        "trap for debug purpose",   /* PTL1_BAD_DEBUG */
#else
        "unknown trap",         /* PTL1_BAD_DEBUG */
#endif
        "register window trap",     /* PTL1_BAD_WTRAP */
        "kernel MMU miss",      /* PTL1_BAD_KMISS */
        "kernel protection fault",  /* PTL1_BAD_KPROT_FAULT */
        "ISM MMU miss",         /* PTL1_BAD_ISM */
        "kernel MMU trap",      /* PTL1_BAD_MMUTRAP */
        "kernel trap handler state",    /* PTL1_BAD_TRAP */
        "floating point trap",      /* PTL1_BAD_FPTRAP */
#ifdef  DEBUG
        "pointer to intr_req",      /* PTL1_BAD_INTR_REQ */
#else
        "unknown trap",         /* PTL1_BAD_INTR_REQ */
#endif
#ifdef  TRAPTRACE
        "TRACE_PTR state",      /* PTL1_BAD_TRACE_PTR */
#else
        "unknown trap",         /* PTL1_BAD_TRACE_PTR */
#endif
        "stack overflow",       /* PTL1_BAD_STACK */
        "DTrace flags",         /* PTL1_BAD_DTRACE_FLAGS */
        "attempt to steal locked ctx",  /* PTL1_BAD_CTX_STEAL */
        "CPU ECC error loop",       /* PTL1_BAD_ECC */
        "unexpected error from hypervisor call", /* PTL1_BAD_HCALL */
        "unexpected global level(%gl)", /* PTL1_BAD_GL */
    };

    uint_t reason = pstate->ptl1_regs.ptl1_gregs[0].ptl1_g1;
    uint_t tl = pstate->ptl1_regs.ptl1_trap_regs[0].ptl1_tl;
    struct trap_info ti = { 0 };

    /*
     * Use trap_info for a place holder to call panic_savetrap() and
     * panic_showtrap() to save and print out ptl1_panic information.
     */
    if (curthread->t_panic_trap == NULL)
        curthread->t_panic_trap = &ti;

    if (reason < sizeof (ptl1_reasons) / sizeof (ptl1_reasons[0]))
        panic("bad %s at TL %u", ptl1_reasons[reason], tl);
    else
        panic("ptl1_panic reason 0x%x at TL %u", reason, tl);
}

void
clear_watchdog_on_exit(void)
{
}

void
clear_watchdog_timer(void)
{
}

int
kdi_watchdog_disable(void)
{
    return (0); /* sun4v has no watchdog */
}

void
kdi_watchdog_restore(void)
{
    /* nothing to do -- no watchdog to re-enable */
}

void
mach_dump_buffer_init(void)
{
    uint64_t  ret, minsize = 0;

    if (hvdump_buf_sz > HVDUMP_SIZE_MAX)
        hvdump_buf_sz = HVDUMP_SIZE_MAX;

    hvdump_buf_va = contig_mem_alloc_align(hvdump_buf_sz, PAGESIZE);
    if (hvdump_buf_va == NULL)
        return;

    hvdump_buf_pa = va_to_pa(hvdump_buf_va);

    ret = hv_dump_buf_update(hvdump_buf_pa, hvdump_buf_sz,
        &minsize);

    if (ret != H_EOK) {
        contig_mem_free(hvdump_buf_va, hvdump_buf_sz);
        hvdump_buf_va = NULL;
        cmn_err(CE_NOTE, "!Error in setting up hvstate"
            "dump buffer. Error = 0x%lx, size = 0x%lx,"
            "buf_pa = 0x%lx", ret, hvdump_buf_sz,
            hvdump_buf_pa);

        if (ret == H_EINVAL) {
            cmn_err(CE_NOTE, "!Buffer size too small."
                "Available buffer size = 0x%lx,"
                "Minimum buffer size required = 0x%lx",
                hvdump_buf_sz, minsize);
        }
    }
}


static void
update_hvdump_buffer(void)
{
    uint64_t ret, dummy_val;

    if (hvdump_buf_va == NULL)
        return;

    ret = hv_dump_buf_update(hvdump_buf_pa, hvdump_buf_sz,
        &dummy_val);
    if (ret != H_EOK) {
        cmn_err(CE_NOTE, "!Cannot update hvstate dump"
            "buffer. Error = 0x%lx", ret);
    }
}


static int
getintprop(pnode_t node, char *name, int deflt)
{
    int value;

    switch (prom_getproplen(node, name)) {
    case 0:
        value = 1;  /* boolean properties */
        break;

    case sizeof (int):
        (void) prom_getprop(node, name, (caddr_t)&value);
        break;

    default:
        value = deflt;
        break;
    }

    return (value);
}

/*
 * Called by setcpudelay
 */
void
cpu_init_tick_freq(void)
{
    sys_tick_freq = cpunodes[CPU->cpu_id].clock_freq;
}

int shipit(int n, uint64_t cpu_list_ra);
extern uint64_t xc_tick_limit;
extern uint64_t xc_tick_jump_limit;

#ifdef DEBUG
#define SEND_MONDO_STATS    1
#endif

#ifdef SEND_MONDO_STATS
uint32_t x_one_stimes[64];
uint32_t x_one_ltimes[16];
uint32_t x_set_stimes[64];
uint32_t x_set_ltimes[16];
uint32_t x_set_cpus[NCPU];
#endif

void
send_one_mondo(int cpuid)
{
    int retries, stat;
    uint64_t starttick, endtick, tick, lasttick;
    struct machcpu  *mcpup = &(CPU->cpu_m);

    CPU_STATS_ADDQ(CPU, sys, xcalls, 1);
    starttick = lasttick = gettick();
    mcpup->cpu_list[0] = (uint16_t)cpuid;
    stat = shipit(1, mcpup->cpu_list_ra);
    endtick = starttick + xc_tick_limit;
    retries = 0;
    while (stat != 0) {
        ASSERT(stat == H_EWOULDBLOCK);
        tick = gettick();
        /*
         * If there is a big jump between the current tick
         * count and lasttick, we have probably hit a break
         * point.  Adjust endtick accordingly to avoid panic.
         */
        if (tick > (lasttick + xc_tick_jump_limit))
            endtick += (tick - lasttick);
        lasttick = tick;
        if (tick > endtick) {
            if (panic_quiesce)
                return;
            cmn_err(CE_PANIC, "send mondo timeout "
                "(target 0x%x) [retries: 0x%x hvstat: 0x%x]",
                cpuid, retries, stat);
        }
        drv_usecwait(1);
        stat = shipit(1, mcpup->cpu_list_ra);
        retries++;
    }
#ifdef SEND_MONDO_STATS
    {
        int n = gettick() - starttick;
        if (n < 8192)
            x_one_stimes[n >> 7]++;
        else if (n < 16*8192)
            x_one_ltimes[(n >> 13) & 0xf]++;
        else
            x_one_ltimes[0xf]++;
    }
#endif
}

void
send_mondo_set(cpuset_t set)
{
    uint64_t starttick, endtick, tick, lasttick;
    int i, retries, stat, fcpuid, lcpuid;
    int ncpuids = 0;
    int shipped = 0;
    struct machcpu  *mcpup = &(CPU->cpu_m);

    ASSERT(!CPUSET_ISNULL(set));
    starttick = lasttick = gettick();
    endtick = starttick + xc_tick_limit;

    fcpuid = -1;
    for (i = 0; i < NCPU; i++) {
        if (CPU_IN_SET(set, i)) {
            ncpuids++;
            mcpup->cpu_list[0] = (uint16_t)i;
            stat = shipit(1, mcpup->cpu_list_ra);
            if (stat != 0) {
                ASSERT(stat == H_EWOULDBLOCK);
                if (fcpuid < 0)
                    fcpuid = i;
                lcpuid = i;
                continue;
            }
            shipped++;
            CPUSET_DEL(set, i);
            if (CPUSET_ISNULL(set))
                break;
        }
    }

    retries = 0;
    while (shipped < ncpuids) {
        ASSERT(fcpuid >= 0 && fcpuid <= lcpuid && lcpuid < NCPU);
        tick = gettick();
        /*
         * If there is a big jump between the current tick
         * count and lasttick, we have probably hit a break
         * point.  Adjust endtick accordingly to avoid panic.
         */
        if (tick > (lasttick + xc_tick_jump_limit))
            endtick += (tick - lasttick);
        lasttick = tick;
        if (tick > endtick) {
            if (panic_quiesce)
                return;
            cmn_err(CE_CONT, "send mondo timeout "
                "[retries: 0x%x]  cpuids: ", retries);
            for (i = fcpuid; i <= lcpuid; i++) {
                if (CPU_IN_SET(set, i))
                    cmn_err(CE_CONT, " 0x%x", i);
            }
            cmn_err(CE_CONT, "\n");
            cmn_err(CE_PANIC, "send_mondo_set: timeout");
        }

        /* adjust fcpuid to the first CPU in set */
        for (; fcpuid <= lcpuid; fcpuid++)
            if (CPU_IN_SET(set, fcpuid))
                break;

        /* adjust lcpuid to the last CPU in set */
        for (; lcpuid >= fcpuid; lcpuid--)
            if (CPU_IN_SET(set, lcpuid))
                break;

        /* resend undelivered mondo */
        for (i = fcpuid; i <= lcpuid; i++) {
            if (CPU_IN_SET(set, i)) {
                mcpup->cpu_list[0] = (uint16_t)i;
                stat = shipit(1, mcpup->cpu_list_ra);
                if (stat != 0) {
                    ASSERT(stat == H_EWOULDBLOCK);
                    continue;
                }
                shipped++;
                CPUSET_DEL(set, i);
                if (shipped == ncpuids)
                    break;
            }
        }
        if (shipped == ncpuids)
            break;

        while (gettick() < (tick + sys_clock_mhz))
            ;
        retries++;
    }

#ifdef SEND_MONDO_STATS
    {
        int n = gettick() - starttick;
        if (n < 8192)
            x_set_stimes[n >> 7]++;
        else if (n < 16*8192)
            x_set_ltimes[(n >> 13) & 0xf]++;
        else
            x_set_ltimes[0xf]++;
    }
    x_set_cpus[shipped]++;
#endif
}

void
syncfpu(void)
{
}

void
cpu_flush_ecache(void)
{
}

void
sticksync_slave(void)
{}

void
sticksync_master(void)
{}

void
cpu_init_cache_scrub(void)
{}

int
dtrace_blksuword32_err(uintptr_t addr, uint32_t *data)
{
    int ret, watched;

    watched = watch_disable_addr((void *)addr, 4, S_WRITE);
    ret = dtrace_blksuword32(addr, data, 0);
    if (watched)
        watch_enable_addr((void *)addr, 4, S_WRITE);

    return (ret);
}

int
dtrace_blksuword32(uintptr_t addr, uint32_t *data, int tryagain)
{
    if (suword32((void *)addr, *data) == -1)
        return (tryagain ? dtrace_blksuword32_err(addr, data) : -1);
    dtrace_flush_sec(addr);

    return (0);
}

/*ARGSUSED*/
void
cpu_faulted_enter(struct cpu *cp)
{
}

/*ARGSUSED*/
void
cpu_faulted_exit(struct cpu *cp)
{
}

static int
kdi_cpu_ready_iter(int (*cb)(int, void *), void *arg)
{
    int rc, i;

    for (rc = 0, i = 0; i < NCPU; i++) {
        if (CPU_IN_SET(cpu_ready_set, i))
            rc += cb(i, arg);
    }

    return (rc);
}

/*
 * Sends a cross-call to a specified processor.  The caller assumes
 * responsibility for repetition of cross-calls, as appropriate (MARSA for
 * debugging).
 */
static int
kdi_xc_one(int cpuid, void (*func)(uintptr_t, uintptr_t), uintptr_t arg1,
    uintptr_t arg2)
{
    int stat;
    struct machcpu  *mcpup;
    uint64_t cpuaddr_reg = 0, cpuaddr_scr = 0;

    mcpup = &(((cpu_t *)get_cpuaddr(cpuaddr_reg, cpuaddr_scr))->cpu_m);

    /*
     * if (idsr_busy())
     *  return (KDI_XC_RES_ERR);
     */

    init_mondo_nocheck((xcfunc_t *)func, arg1, arg2);

    mcpup->cpu_list[0] = (uint16_t)cpuid;
    stat = shipit(1, mcpup->cpu_list_ra);

    if (stat == 0)
        return (KDI_XC_RES_OK);
    else
        return (KDI_XC_RES_NACK);
}

static void
kdi_tickwait(clock_t nticks)
{
    clock_t endtick = gettick() + nticks;

    while (gettick() < endtick);
}

static void
kdi_cpu_init(int dcache_size, int dcache_linesize, int icache_size,
    int icache_linesize)
{
    kdi_dcache_size = dcache_size;
    kdi_dcache_linesize = dcache_linesize;
    kdi_icache_size = icache_size;
    kdi_icache_linesize = icache_linesize;
}

/* used directly by kdi_read/write_phys */
void
kdi_flush_caches(void)
{
    /* Not required on sun4v architecture. */
}

/*ARGSUSED*/
int
kdi_get_stick(uint64_t *stickp)
{
    return (-1);
}

void
cpu_kdi_init(kdi_t *kdi)
{
    kdi->kdi_flush_caches = kdi_flush_caches;
    kdi->mkdi_cpu_init = kdi_cpu_init;
    kdi->mkdi_cpu_ready_iter = kdi_cpu_ready_iter;
    kdi->mkdi_xc_one = kdi_xc_one;
    kdi->mkdi_tickwait = kdi_tickwait;
    kdi->mkdi_get_stick = kdi_get_stick;
}

/*
 * Routine to return memory information associated
 * with a physical address and syndrome.
 */
/* ARGSUSED */
int
cpu_get_mem_info(uint64_t synd, uint64_t afar,
    uint64_t *mem_sizep, uint64_t *seg_sizep, uint64_t *bank_sizep,
    int *segsp, int *banksp, int *mcidp)
{
    return (ENOTSUP);
}

/*
 * This routine returns the size of the kernel's FRU name buffer.
 */
size_t
cpu_get_name_bufsize()
{
    return (UNUM_NAMLEN);
}

/*
 * This routine is a more generic interface to cpu_get_mem_unum(),
 * that may be used by other modules (e.g. mm).
 */
/* ARGSUSED */
int
cpu_get_mem_name(uint64_t synd, uint64_t *afsr, uint64_t afar,
    char *buf, int buflen, int *lenp)
{
    return (ENOTSUP);
}

/*
 * xt_sync - wait for previous x-traps to finish
 */
void
xt_sync(cpuset_t cpuset)
{
    union {
        uint8_t volatile byte[NCPU];
        uint64_t volatile xword[NCPU / 8];
    } cpu_sync;
    uint64_t starttick, endtick, tick, lasttick;
    int i;

    kpreempt_disable();
    CPUSET_DEL(cpuset, CPU->cpu_id);
    CPUSET_AND(cpuset, cpu_ready_set);

    /*
     * Sun4v uses a queue for receiving mondos. Successful
     * transmission of a mondo only indicates that the mondo
     * has been written into the queue.
     *
     * We use an array of bytes to let each cpu to signal back
     * to the cross trap sender that the cross trap has been
     * executed. Set the byte to 1 before sending the cross trap
     * and wait until other cpus reset it to 0.
     */
    bzero((void *)&cpu_sync, NCPU);
    for (i = 0; i < NCPU; i++)
        if (CPU_IN_SET(cpuset, i))
            cpu_sync.byte[i] = 1;

    xt_some(cpuset, (xcfunc_t *)xt_sync_tl1,
        (uint64_t)cpu_sync.byte, 0);

    starttick = lasttick = gettick();
    endtick = starttick + xc_tick_limit;

    for (i = 0; i < (NCPU / 8); i ++) {
        while (cpu_sync.xword[i] != 0) {
            tick = gettick();
            /*
             * If there is a big jump between the current tick
             * count and lasttick, we have probably hit a break
             * point. Adjust endtick accordingly to avoid panic.
             */
            if (tick > (lasttick + xc_tick_jump_limit)) {
                endtick += (tick - lasttick);
            }
            lasttick = tick;
            if (tick > endtick) {
                if (panic_quiesce)
                    goto out;
                cmn_err(CE_CONT, "Cross trap sync timeout "
                    "at cpu_sync.xword[%d]: 0x%lx\n",
                    i, cpu_sync.xword[i]);
                cmn_err(CE_PANIC, "xt_sync: timeout");
            }
        }
    }

out:
    kpreempt_enable();
}