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