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Annotation of sys/arch/alpha/alpha/multiproc.s, Revision 1.1

1.1     ! nbrk        1: /* $OpenBSD: multiproc.s,v 1.2 2000/11/08 19:16:59 ericj Exp $ */
        !             2: /* $NetBSD: multiproc.s,v 1.5 1999/12/16 20:17:23 thorpej Exp $ */
        !             3:
        !             4: /*-
        !             5:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * This code is derived from software contributed to The NetBSD Foundation
        !             9:  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
        !            10:  * NASA Ames Research Center.
        !            11:  *
        !            12:  * Redistribution and use in source and binary forms, with or without
        !            13:  * modification, are permitted provided that the following conditions
        !            14:  * are met:
        !            15:  * 1. Redistributions of source code must retain the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer.
        !            17:  * 2. Redistributions in binary form must reproduce the above copyright
        !            18:  *    notice, this list of conditions and the following disclaimer in the
        !            19:  *    documentation and/or other materials provided with the distribution.
        !            20:  * 3. All advertising materials mentioning features or use of this software
        !            21:  *    must display the following acknowledgement:
        !            22:  *     This product includes software developed by the NetBSD
        !            23:  *     Foundation, Inc. and its contributors.
        !            24:  * 4. Neither the name of The NetBSD Foundation nor the names of its
        !            25:  *    contributors may be used to endorse or promote products derived
        !            26:  *    from this software without specific prior written permission.
        !            27:  *
        !            28:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
        !            29:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            30:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            31:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
        !            32:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            33:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            34:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            35:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            36:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            37:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            38:  * POSSIBILITY OF SUCH DAMAGE.
        !            39:  */
        !            40:
        !            41: __KERNEL_RCSID(5, "$NetBSD: multiproc.s,v 1.5 1999/12/16 20:17:23 thorpej Exp $")
        !            42:
        !            43: /*
        !            44:  * Multiprocessor glue code.
        !            45:  */
        !            46:
        !            47:        .text
        !            48: inc5:  .stabs  __FILE__,132,0,0,inc5; .loc     1 __LINE__
        !            49:
        !            50: /*
        !            51:  * cpu_spinup_trampoline:
        !            52:  *
        !            53:  * We come here via the secondary processor's console.  We simply
        !            54:  * make the function call look right, and call cpu_hatch() to finish
        !            55:  * starting up the processor.
        !            56:  *
        !            57:  * We are provided an argument in $27 (pv) (which will be our cpu_info).
        !            58:  */
        !            59: NESTED_NOPROFILE(cpu_spinup_trampoline,0,0,ra,0,0)
        !            60:        mov     pv, s0                  /* squirrel away argument */
        !            61:
        !            62:        br      pv, 1f                  /* compute new GP */
        !            63: 1:     LDGP(pv)
        !            64:
        !            65:        /* Invalidate TLB and I-stream. */
        !            66:        ldiq    a0, -2                  /* TBIA */
        !            67:        call_pal PAL_OSF1_tbi
        !            68:        call_pal PAL_imb
        !            69:
        !            70:        /* Load KGP with current GP. */
        !            71:        mov     gp, a0
        !            72:        call_pal PAL_OSF1_wrkgp         /* clobbers a0, t0, t8-t11 */
        !            73:
        !            74:        /* Restore argument and write it in SysValue. */
        !            75:        mov     s0, a0
        !            76:        call_pal PAL_OSF1_wrval
        !            77:
        !            78:        /* Restore argument and call cpu_hatch() */
        !            79:        mov     s0, a0
        !            80:        CALL(cpu_hatch)
        !            81:
        !            82:        /* cpu_hatch() returned!  Just halt (forever). */
        !            83: 2:     call_pal PAL_halt
        !            84:        br      zero, 2b
        !            85:        END(cpu_spinup_trampoline)