1 /* -*- linux-c -*- ------------------------------------------------------- * 2 * 3 * Copyright (C) 1991, 1992 Linus Torvalds 4 * Copyright 2007 rPath, Inc. - All Rights Reserved 5 * 6 * This file is part of the Linux kernel, and is made available under 7 * the terms of the GNU General Public License version 2. 8 * 9 * ----------------------------------------------------------------------- */ 10 11 /* 12 * Very simple bitops for the boot code. 13 */ 14 15 #ifndef BOOT_BITOPS_H 16 #define BOOT_BITOPS_H 17 #define _LINUX_BITOPS_H /* Inhibit inclusion of <linux/bitops.h> */ 18 19 #include <linux/types.h> 20 #include <asm/asm.h> 21 22 static inline bool constant_test_bit(int nr, const void *addr) 23 { 24 const u32 *p = (const u32 *)addr; 25 return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0; 26 } 27 static inline bool variable_test_bit(int nr, const void *addr) 28 { 29 bool v; 30 const u32 *p = (const u32 *)addr; 31 32 asm("btl %2,%1" CC_SET(c) : CC_OUT(c) (v) : "m" (*p), "Ir" (nr)); 33 return v; 34 } 35 36 #define test_bit(nr,addr) \ 37 (__builtin_constant_p(nr) ? \ 38 constant_test_bit((nr),(addr)) : \ 39 variable_test_bit((nr),(addr))) 40 41 static inline void set_bit(int nr, void *addr) 42 { 43 asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr)); 44 } 45 46 #endif /* BOOT_BITOPS_H */ 47