1 /* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2010-2011 Intel Corporation; author: H. Peter Anvin 4 * 5 * Permission is hereby granted, free of charge, to any person 6 * obtaining a copy of this software and associated documentation 7 * files (the "Software"), to deal in the Software without 8 * restriction, including without limitation the rights to use, 9 * copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom 11 * the Software is furnished to do so, subject to the following 12 * conditions: 13 * 14 * The above copyright notice and this permission notice shall 15 * be included in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 24 * OTHER DEALINGS IN THE SOFTWARE. 25 * 26 * ----------------------------------------------------------------------- */ 27 28 /* 29 * i386 bitops.h 30 * 31 * Simple bitwise operations 32 */ 33 static inline void set_bit(long __bit, void *__bitmap) 34 { 35 asm volatile("btsl %1,%0" 36 : "+m" (*(unsigned char *)__bitmap) 37 : "Ir" (__bit) : "memory"); 38 } 39 40 static inline void clr_bit(long __bit, void *__bitmap) 41 { 42 asm volatile("btcl %1,%0" 43 : "+m" (*(unsigned char *)__bitmap) 44 : "Ir" (__bit) : "memory"); 45 } 46 47 static inline int __purefunc test_bit(long __bit, const void *__bitmap) 48 { 49 unsigned char __r; 50 asm("btl %2,%1; setc %0" 51 : "=qm" (__r) 52 : "m" (*(const unsigned char *)__bitmap), "Ir" (__bit)); 53 return __r; 54 } 55
