/* $OpenBSD: multiproc.s,v 1.5 2014/01/26 17:40:09 miod Exp $ */
/* $NetBSD: multiproc.s,v 1.5 1999/12/16 20:17:23 thorpej Exp $ */

/*-
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

.file   4 __FILE__
.loc    4 __LINE__

/*
 * Multiprocessor glue code.
 */

        .text

/*
 * cpu_spinup_trampoline:
 *
 * We come here via the secondary processor's console.  We simply
 * make the function call look right, and call cpu_hatch() to finish
 * starting up the processor.
 *
 * We are provided an argument in $27 (pv) (which will be our cpu_info).
 */
NESTED_NOPROFILE(cpu_spinup_trampoline,0,0,ra,0,0)
        mov     pv, s0                  /* squirrel away argument */

        br      pv, 1f                  /* compute new GP */
1:      LDGP(pv)

        /* Write new KGP. */
        mov     gp, a0
        call_pal PAL_OSF1_wrkgp         /* clobbers a0, t0, t8-t11 */

        /* Store our CPU info in SysValue. */
        mov     s0, a0
        call_pal PAL_OSF1_wrval

        /* Switch to this CPU's idle thread. */
        ldq     a0, CPU_INFO_IDLE_PCB_PADDR(s0)
        SWITCH_CONTEXT

        /* Invalidate TLB and I-stream. */
        ldiq    a0, -2                  /* TBIA */
        call_pal PAL_OSF1_tbi
        call_pal PAL_imb

        /* Make sure the FPU is turned off. */
        mov     zero, a0
        call_pal PAL_OSF1_wrfen

        /* Restore argument and call cpu_hatch() */
        mov     s0, a0
        CALL(cpu_hatch)

        /* cpu_hatch() returned!  Just halt (forever). */
2:      call_pal PAL_halt
        br      zero, 2b
        END(cpu_spinup_trampoline)