55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2010-2011 Intel Corporation; author: H. Peter Anvin
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* i386 bitops.h
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*
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* Simple bitwise operations
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*/
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static inline void set_bit(long __bit, void *__bitmap)
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{
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asm volatile("btsl %1,%0"
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: "+m" (*(unsigned char *)__bitmap)
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: "Ir" (__bit) : "memory");
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}
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static inline void clr_bit(long __bit, void *__bitmap)
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{
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asm volatile("btcl %1,%0"
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: "+m" (*(unsigned char *)__bitmap)
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: "Ir" (__bit) : "memory");
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}
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static inline int __purefunc test_bit(long __bit, const void *__bitmap)
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{
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unsigned char __r;
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asm("btl %2,%1; setc %0"
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: "=qm" (__r)
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: "m" (*(const unsigned char *)__bitmap), "Ir" (__bit));
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return __r;
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}
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