[mirror_ubuntu-bionic-kernel.git] / arch / x86 / boot / bitops.h

/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

/*
 * Very simple bitops for the boot code.
 */

#ifndef BOOT_BITOPS_H
#define BOOT_BITOPS_H
#define _LINUX_BITOPS_H		/* Inhibit inclusion of <linux/bitops.h> */

static inline int constant_test_bit(int nr, const void *addr)
{
	const u32 *p = (const u32 *)addr;
	return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0;
}
static inline int variable_test_bit(int nr, const void *addr)
{
	u8 v;
	const u32 *p = (const u32 *)addr;

	asm("btl %2,%1; setc %0" : "=qm" (v) : "m" (*p), "Ir" (nr));
	return v;
}

#define test_bit(nr,addr) \
(__builtin_constant_p(nr) ? \
 constant_test_bit((nr),(addr)) : \
 variable_test_bit((nr),(addr)))

static inline void set_bit(int nr, void *addr)
{
	asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr));
}

#endif /* BOOT_BITOPS_H */
Commit	Line	Data
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 */