openbios/openboot/obp/cpu/sparc/mutex.fth

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• Hash : 1a08f436
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  Date : 2010-08-25T09:23:17
  

  change to well-formed svn directory structure. git-svn-id: svn://coreboot.org/openboot/trunk@2 4486e004-3823-0410-90c7-fb508cc143bb

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• obp/cpu/sparc/mutex.fth

• \ ========== Copyright Header Begin ==========================================
  \ 
  \ Hypervisor Software File: mutex.fth
  \ 
  \ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
  \ 
  \  - Do no alter or remove copyright notices
  \ 
  \  - Redistribution and use of this software in source and binary forms, with 
  \    or without modification, are permitted provided that the following 
  \    conditions are met: 
  \ 
  \  - Redistribution of source code must retain the above copyright notice, 
  \    this list of conditions and the following disclaimer.
  \ 
  \  - Redistribution 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. 
  \ 
  \    Neither the name of Sun Microsystems, Inc. or the names of contributors 
  \ may be used to endorse or promote products derived from this software 
  \ without specific prior written permission. 
  \ 
  \     This software is provided "AS IS," without a warranty of any kind. 
  \ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, 
  \ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A 
  \ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN 
  \ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR 
  \ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR 
  \ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN 
  \ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR 
  \ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE 
  \ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, 
  \ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF 
  \ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  \ 
  \ You acknowledge that this software is not designed, licensed or
  \ intended for use in the design, construction, operation or maintenance of
  \ any nuclear facility. 
  \ 
  \ ========== Copyright Header End ============================================
  id: @(#)mutex.fth 1.5 01/05/11
  purpose: 
  copyright: Copyright 1999-2001 Sun Microsystems, Inc.  All Rights Reserved
  
  headers transient
  
  : mutex-create ( -- ) \ name
     label -1 l, end-code
  ;
  
  : sema-create ( -- ) \ name
     label 1 l, end-code
  ;
  
  also assembler definitions
  hex
  
  : mutex-exit ( scr sc1 sc2 -- ) \ which?
     dup get-mid
     over ' >body origin-  aligned swap  set	\ offset of mutex
     over base  over         add			\ Address of mutex
     rot  >r
     %g0   1           r@    sub			\ -1
  \   h# 80 swap        r>    casa
     h# 04 swap        r>    casa
  ; immediate
  
  : mutex-set ( value-reg scr -- ) \ which?
     ' >body origin- aligned over set
     dup  base  over      add
     %g0                  st
  ; immediate
  
  \
  \ if scr = -1 then you got the lock (ie the lock was -1), otherwise
  \ it is the current owner.
  \
  : mutex-try-enter ( scr sc1 sc2 -- scr ) \ which?
     dup  get-mid
     over ' >body origin-  aligned swap  set	\ offset of mutex
     over base  over         add			\ Address of mutex
     rot  >r
     %g0   1           r@    sub			\ -1
     h# 04 r@   rot >r r@    casa
  \   h# 80 r@   rot >r r@    casa
     r>    0           r>    sra
  ; immediate
  
  : mutex-enter ( scr sc1 sc2 sc3 -- ) \ which?
     over  get-mid
     2dup  move >r
     over ' >body origin-  aligned swap  set	\ offset of mutex
     over base  over         add			\ Address of mutex
     rot  >r
     [ also assembler ]
     begin -rot
        nop nop nop				\ allow a little slack time.
        2r@ drop  over move			\ restore mid
        %g0   1          r@  sub			\ -1
  \      h# 80 r> rot dup >r  casa
        h# 04 r> rot dup >r  casa
        r@ 0             r@  sra
        r@ -1                cmp
        0=  if
           r>    r>          cmp
           %g0   %g0   %g0   subcc		\ aquired lock
        then
     0= until  nop
     [ previous ]
  ; immediate
  
  0 value sema-scr
  0 value sema-sc1
  0 value sema-sc2
  
  \ src contains the value to init the semaphore with
  : init-sema ( scr sc1 -- ) \ name
     to sema-sc1
     to sema-scr
     ' >body origin-  aligned sema-sc1 set	\ sc1 = offset of semaphore
     sema-scr  sema-sc1  base	st		\ store
  ; immediate
  
  : sema-atsub ( -- )
     sema-scr  base  sema-scr	add		\ VA of semaphore
     sema-scr  %g0   sema-sc1	ld
     begin
        sema-sc1  1  sema-sc2	sub
        sema-scr h# 04 sema-sc1  sema-sc2  casa
        sema-sc1  sema-sc2  %g0	subcc
     0= until annul
        sema-scr  %g0   sema-sc1	ld
     sema-sc1  1  sema-scr	sub  
  ;
  
  \ decremented value is returned in scr.
  : decr-sema ( scr sc1 sc2 -- ) \ name
     to sema-sc2
     to sema-sc1
     to sema-scr
     ' >body origin-  aligned sema-scr set	\ scr = offset of semaphore
     sema-atsub
  ; immediate
  
  : wait-sema ( scr sc1 sc2 -- ) \ name
     to sema-sc2
     to sema-sc1
     to sema-scr
     ' >body origin-  aligned sema-scr set	\ scr = offset of semaphore
     sema-scr >r
     sema-atsub
     begin
        sema-scr  %g0  %g0  subcc
     0= until annul
        r>  base  sema-scr  ld
  ; immediate
  
  resident
  previous definitions
  

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