1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 
  27 #include <sys/param.h>
  28 #include <sys/errno.h>
  29 #include <sys/asm_linkage.h>
  30 #include <sys/vtrace.h>
  31 #include <sys/machthread.h>
  32 #include <sys/clock.h>
  33 #include <sys/asi.h>
  34 #include <sys/fsr.h>
  35 #include <sys/privregs.h>
  36 #include <sys/pte.h>
  37 #include <sys/mmu.h>
  38 #include <sys/spitregs.h>
  39 
  40 #include "assym.h"
  41 
  42 #define TT_HSM  0x99
  43 
  44 /*
  45  * This routine quiets a cpu and has it spin on a barrier.
  46  * It is used during memory sparing so that no memory operation
  47  * occurs during the memory copy.
  48  *
  49  *      Entry:
  50  *              %g1    - gate array base address
  51  *              %g2    - barrier base address
  52  *              %g3    - arg2
  53  *              %g4    - arg3
  54  *
  55  *      Register Usage:
  56  *              %g3    - saved pstate
  57  *              %g4    - temporary
  58  *              %g5    - check for panicstr
  59  */
  60         ENTRY_NP(sysctrl_freeze)
  61         CPU_INDEX(%g4, %g5)
  62         sll     %g4, 2, %g4
  63         add     %g4, %g1, %g4                   ! compute address of gate id
  64 
  65         st      %g4, [%g4]                      ! indicate we are ready
  66         membar  #Sync
  67 1:
  68         sethi   %hi(panicstr), %g5
  69         ldn     [%g5 + %lo(panicstr)], %g5
  70         brnz    %g5, 2f                         ! exit if in panic
  71          nop
  72         ld      [%g2], %g4
  73         brz,pt  %g4, 1b                         ! spin until barrier true
  74          nop
  75 
  76 2:
  77         retry
  78         membar  #Sync
  79         SET_SIZE(sysctrl_freeze)
  80