spin.s
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- ; ***** BEGIN LICENSE BLOCK *****
- ; Source last modified: $Id: spin.s,v 1.1 2003/05/22 00:18:41 dcollins Exp $
- ;
- ; Portions Copyright (c) 1995-2003 RealNetworks, Inc. All Rights Reserved.
- ;
- ; The contents of this file, and the files included with this file,
- ; are subject to the current version of the RealNetworks Public
- ; Source License (the "RPSL") available at
- ; http://www.helixcommunity.org/content/rpsl unless you have licensed
- ; the file under the current version of the RealNetworks Community
- ; Source License (the "RCSL") available at
- ; http://www.helixcommunity.org/content/rcsl, in which case the RCSL
- ; will apply. You may also obtain the license terms directly from
- ; RealNetworks. You may not use this file except in compliance with
- ; the RPSL or, if you have a valid RCSL with RealNetworks applicable
- ; to this file, the RCSL. Please see the applicable RPSL or RCSL for
- ; the rights, obligations and limitations governing use of the
- ; contents of the file.
- ;
- ; This file is part of the Helix DNA Technology. RealNetworks is the
- ; developer of the Original Code and owns the copyrights in the
- ; portions it created.
- ;
- ; This file, and the files included with this file, is distributed
- ; and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
- ; KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
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- ; OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
- ; ENJOYMENT OR NON-INFRINGEMENT.
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- ; Technology Compatibility Kit Test Suite(s) Location:
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- ; Contributor(s):
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- ; ***** END LICENSE BLOCK *****
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;
- ;
- ; spin.s: Example assembly language routine for spinlock support.
- ;
- ;
- ; XXXDC -- Since the caller has aligned the pointer I simplified this
- ; routine by eliminating this code. The pointer must be 16-byte aligned
- ; for a 32-bit environment.
- ;
- ; Also, couldn't we eliminate the nop's? This is only needed for
- ; old hardware.
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- .code
- ; .level 2.0W ; use this option for 64-bit assembly
- .export load_and_clear,entry,priv_lev=3,rtnval=gr
- .proc
- load_and_clear
- .callinfo no_calls
- .enter
- ; create a 16 byte aligned pointer to the load+clear word area
- addi 15,%arg0,%arg2 ; add 15 to pointer provided to round up
- ; Choose one of these statements and comment out the other:
- depi 0,31,4,%arg2 ; mask off the lower 4 bits (32-bit version)
- ;; depdi 0,63,4,%arg2 ; mask off the lower 4 bits (64-bit version)
-
- ; load and clear the spinlock. If locked, return 0
- stbys,e 0,(%arg2) ; scrub cache; important for performance
- ldcws (%arg2),%ret0 ; load and clear the spinlock word
- nop ; 3 No-Op instructions; needed for older
- nop ; HP-PA chips
- nop
- bv,n (%r2)
- .leave
- .procend
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;OLD OLD OLD
- ;;
- ; create a 16 byte aligned pointer to the load+clear word area
- ; addi 15,%arg0,%arg2 ; add 15 to pointer provided to round up
- ;
- ; Choose one of these statements and comment out the other:
- ; depi 0,31,4,%arg2 ; mask off the lower 4 bits (32-bit version)
- ;; depdi 0,63,4,%arg2 ; mask off the lower 4 bits (64-bit version)
- ;
- ; load and clear the spinlock. If locked, return 0
- ; stbys,e 0,(%arg2) ; scrub cache; important for performance
- ; ldcws (%arg2),%ret0 ; load and clear the spinlock word
- ; nop ; 3 No-Op instructions; needed for older
- ; nop ; HP-PA chips
- ; nop
- ; bv,n (%r2)
- ; .leave
- ; .procend
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;