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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28 
  29 #include <sys/param.h>
  30 #include <sys/errno.h>
  31 #include <sys/asm_linkage.h>
  32 #include <sys/vtrace.h>
  33 #include <sys/machthread.h>
  34 #include <sys/clock.h>
  35 #include <sys/asi.h>
  36 #include <sys/fsr.h>
  37 #include <sys/privregs.h>
  38 #include <sys/pte.h>
  39 #include <sys/mmu.h>
  40 #include <sys/spitregs.h>
  41 
  42 #if defined(lint)
  43 
  44 #else   /* lint */
  45 #include "assym.h"
  46 #endif  /* lint */
  47 
  48 #define TT_HSM  0x99
  49 
  50 #if defined(lint)
  51 void
  52 sysctrl_freeze(void)
  53 {}
  54 #else /* lint */
  55 /*
  56  * This routine quiets a cpu and has it spin on a barrier.
  57  * It is used during memory sparing so that no memory operation
  58  * occurs during the memory copy.
  59  *
  60  *      Entry:
  61  *              %g1    - gate array base address
  62  *              %g2    - barrier base address
  63  *              %g3    - arg2
  64  *              %g4    - arg3
  65  *
  66  *      Register Usage:
  67  *              %g3    - saved pstate
  68  *              %g4    - temporary
  69  *              %g5    - check for panicstr
  70  */
  71         ENTRY_NP(sysctrl_freeze)
  72         CPU_INDEX(%g4, %g5)
  73         sll     %g4, 2, %g4
  74         add     %g4, %g1, %g4                   ! compute address of gate id
  75 
  76         st      %g4, [%g4]                      ! indicate we are ready
  77         membar  #Sync
  78 1:
  79         sethi   %hi(panicstr), %g5
  80         ldn     [%g5 + %lo(panicstr)], %g5
  81         brnz    %g5, 2f                         ! exit if in panic
  82          nop
  83         ld      [%g2], %g4
  84         brz,pt  %g4, 1b                         ! spin until barrier true
  85          nop
  86 
  87 2:
  88         retry
  89         membar  #Sync
  90         SET_SIZE(sysctrl_freeze)
  91 
  92 #endif  /* lint */