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