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
constant_test_bit(int nr,const void * addr)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 }
variable_test_bit(int nr,const void * addr)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
set_bit(int nr,void * addr)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