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41 lines
1.7 KiB
Plaintext
41 lines
1.7 KiB
Plaintext
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/*
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* @(#)parisc.gcc 8.5 (Sleepycat) 1/18/97
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*
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* Copyright (c) 1996-1997, The University of Utah and the Computer Systems
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* Laboratory at the University of Utah (CSL). All rights reserved.
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*
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* Permission to use, copy, modify and distribute this software is hereby
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* granted provided that (1) source code retains these copyright, permission,
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* and disclaimer notices, and (2) redistributions including binaries
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* reproduce the notices in supporting documentation, and (3) all advertising
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* materials mentioning features or use of this software display the following
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* acknowledgement: ``This product includes software developed by the Computer
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* Systems Laboratory at the University of Utah.''
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*
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* THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
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* IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
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* ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* CSL requests users of this software to return to csl-dist@cs.utah.edu any
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* improvements that they make and grant CSL redistribution rights.
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*/
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/*
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* The PA-RISC has a "load and clear" instead of a "test and set" instruction.
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* The 32-bit word used by that instruction must be 16-byte aligned hence we
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* allocate 16 bytes for a tsl_t and use the word that is properly aligned.
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* We could use the "aligned" attribute in GCC but that doesn't work for stack
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* variables.
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*/
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#define TSL_SET(tsl) ({ \
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int *__l = (int *)(((int)(tsl)+15)&~15); \
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int __r; \
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asm volatile("ldcws 0(%1),%0" : "=r" (__r) : "r" (__l)); \
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__r & 1; \
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})
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#define TSL_UNSET(tsl) ({ \
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int *__l = (int *)(((int)(tsl)+15)&~15); \
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*__l = -1; \
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})
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