1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /* -*- linux-c -*- ------------------------------------------------------- *
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 1991, 1992 Linus Torvalds
5*4882a593Smuzhiyun * Copyright 2007 rPath, Inc. - All Rights Reserved
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * ----------------------------------------------------------------------- */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun /*
10*4882a593Smuzhiyun * Very simple bitops for the boot code.
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #ifndef BOOT_BITOPS_H
14*4882a593Smuzhiyun #define BOOT_BITOPS_H
15*4882a593Smuzhiyun #define _LINUX_BITOPS_H /* Inhibit inclusion of <linux/bitops.h> */
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include <linux/types.h>
18*4882a593Smuzhiyun #include <asm/asm.h>
19*4882a593Smuzhiyun
constant_test_bit(int nr,const void * addr)20*4882a593Smuzhiyun static inline bool constant_test_bit(int nr, const void *addr)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun const u32 *p = (const u32 *)addr;
23*4882a593Smuzhiyun return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0;
24*4882a593Smuzhiyun }
variable_test_bit(int nr,const void * addr)25*4882a593Smuzhiyun static inline bool variable_test_bit(int nr, const void *addr)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun bool v;
28*4882a593Smuzhiyun const u32 *p = (const u32 *)addr;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun asm("btl %2,%1" CC_SET(c) : CC_OUT(c) (v) : "m" (*p), "Ir" (nr));
31*4882a593Smuzhiyun return v;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun #define test_bit(nr,addr) \
35*4882a593Smuzhiyun (__builtin_constant_p(nr) ? \
36*4882a593Smuzhiyun constant_test_bit((nr),(addr)) : \
37*4882a593Smuzhiyun variable_test_bit((nr),(addr)))
38*4882a593Smuzhiyun
set_bit(int nr,void * addr)39*4882a593Smuzhiyun static inline void set_bit(int nr, void *addr)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr));
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun #endif /* BOOT_BITOPS_H */
45