hypervisor/src/common/src/traps_common.s

/*
* ========== Copyright Header Begin ==========================================
*
* Hypervisor Software File: traps_common.s
*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

        .ident  "@(#)traps_common.s     1.2     07/05/24 SMI"

        .file   "traps_common.s"

#include <sys/asm_linkage.h>
#include <sys/stack.h>
#include <hypervisor.h>
#include <hprivregs.h>
#include <asi.h>
#include <mmu.h>
#include <sun4v/traps.h>
#include <sun4v/mmu.h>

#include <traps.h>
#include <traptable.h>
#include <offsets.h>
#include <util.h>
#include <guest.h>
#include <traptrace.h>
#include <debug.h>
#include <abort.h>
#include <util.h>

/*
 * nonresumable_error_trap - enter a guest on the non-resumable error
 * trap vector.
 *
 * The processor does not detect nrq head != tail, any places
 * that possibly enqueue a nr error queue entry must check head != tail and
 * branch here.
 */
        ENTRY(nonresumable_error_trap)
        ! ensure that there is an outbound queue
        VCPU_STRUCT(%g1)
        ldx     [%g1 + CPU_ERRQNR_BASE_RA], %g2 ! get q base
        brnz    %g2, 1f                         ! if base RA is zero, skip
        nop
        ! The nonresumable error queue is not allocated/initialized
        HVABORT(-1, "nonresumable_error_trap: nrq missing\r\n")

1:
        REVECTOR(TT_NONRESUMABLE_ERR)
        SET_SIZE(nonresumable_error_trap)


/*
 * watchdog - enter a guest on the watchdog trap vector
 */
        ENTRY_NP(watchdog)
        LEGION_GOT_HERE
        rdhpr   %htstate, %g1
        btst    HTSTATE_HPRIV, %g1
        bz      1f
        nop

        /* XXX hypervisor_fatal */

1:
        ! Disable MMU
        ldxa    [%g0]ASI_LSUCR, %g1
        set     (LSUCR_DM | LSUCR_IM), %g2
        andn    %g1, %g2, %g1   ! disable MMU
        stxa    %g1, [%g0]ASI_LSUCR

        ! Get real-mode trap table base address
        VCPU_STRUCT(%g1)
        ldx     [%g1 + CPU_RTBA], %g1
        add     %g1, (TT_WDR << TT_OFFSET_SHIFT), %g1
        wrpr    %g1, %tnpc
        done
        SET_SIZE(watchdog)

        /* XXX for now just go to the guest since that tends
         * to be what we are debugging */

/*
 * xir - enter the guest on the xir trap vector
 *
 * XXX - for now just go to the guest since that tends
 * to be what we are debugging
 */
        ENTRY_NP(xir)
        wrpr    %g0, 1, %tl
        rdhpr   %hpstate, %g7
        wrhpr   %g7, HPSTATE_RED, %hpstate
        LEGION_GOT_HERE

        ! Disable MMU
        ldxa    [%g0]ASI_LSUCR, %g1
        set     (LSUCR_DM | LSUCR_IM), %g2
        andn    %g1, %g2, %g1   ! disable MMU
        stxa    %g1, [%g0]ASI_LSUCR

        ! Get real-mode trap table base address
        VCPU_STRUCT(%g1)
        ldx     [%g1 + CPU_RTBA], %g1
        wrpr    %g1, %tba
        add     %g1, (TT_XIR << TT_OFFSET_SHIFT), %g1
        wrpr    %g1, %tnpc
        done
        SET_SIZE(xir)

        ENTRY_NP(badtrap)
#ifdef DEBUG
        /*
         * This gives greater visibility into what's happening on debug
         * hypervisors.
         */
        ba,a    watchdog_guest
        nop
#endif
        LEGION_GOT_HERE
        ba,pt %xcc, hvabort
          rdpr  %tpc, %g1
        SET_SIZE(badtrap)