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ad7e906d PA |
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 | /* | |
ad7e906d PA |
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 */ |