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 19static 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} 24static 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 38static 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