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Annotation of sys/arch/alpha/alpha/multiproc.s, Revision 1.1.1.1

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)