1 /* -*- linux-c -*- ------------------------------------------------------- *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
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.
9 * ----------------------------------------------------------------------- */
12 * arch/i386/boot/bitops.h
14 * Very simple bitops for the boot code.
19 #define _LINUX_BITOPS_H /* Inhibit inclusion of <linux/bitops.h> */
21 static inline int constant_test_bit(int nr
, const void *addr
)
23 const u32
*p
= (const u32
*)addr
;
24 return ((1UL << (nr
& 31)) & (p
[nr
>> 5])) != 0;
26 static inline int variable_test_bit(int nr
, const void *addr
)
29 const u32
*p
= (const u32
*)addr
;
31 asm("btl %2,%1; setc %0" : "=qm" (v
) : "m" (*p
), "Ir" (nr
));
35 #define test_bit(nr,addr) \
36 (__builtin_constant_p(nr) ? \
37 constant_test_bit((nr),(addr)) : \
38 variable_test_bit((nr),(addr)))
40 static inline void set_bit(int nr
, void *addr
)
42 asm("btsl %1,%0" : "+m" (*(u32
*)addr
) : "Ir" (nr
));
45 #endif /* BOOT_BITOPS_H */
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