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 static inline int constant_test_bit(int nr, const void *addr) 20 { 21 const u32 *p = (const u32 *)addr; 22 return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0; 23 } 24 static inline int variable_test_bit(int nr, const void *addr) 25 { 26 u8 v; 27 const u32 *p = (const u32 *)addr; 28 29 asm("btl %2,%1; setc %0" : "=qm" (v) : "m" (*p), "Ir" (nr)); 30 return v; 31 } 32 33 #define test_bit(nr,addr) \ 34 (__builtin_constant_p(nr) ? \ 35 constant_test_bit((nr),(addr)) : \ 36 variable_test_bit((nr),(addr))) 37 38 static inline void set_bit(int nr, void *addr) 39 { 40 asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr)); 41 } 42 43 #endif /* BOOT_BITOPS_H */ 44