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
20static 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}
25static 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
39static 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 */

 
 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
19static 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}
24static 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
38static 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 */