forked from Minki/linux
97873a3daf
Based on 1 normalized pattern(s): this file is part of the linux kernel and is made available under the terms of the gnu general public license version 2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 28 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.534229504@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* -*- linux-c -*- ------------------------------------------------------- *
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright 2007 rPath, Inc. - All Rights Reserved
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*
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* ----------------------------------------------------------------------- */
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/*
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* Very simple bitops for the boot code.
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*/
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#ifndef BOOT_BITOPS_H
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#define BOOT_BITOPS_H
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#define _LINUX_BITOPS_H /* Inhibit inclusion of <linux/bitops.h> */
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#include <linux/types.h>
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#include <asm/asm.h>
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static inline bool constant_test_bit(int nr, const void *addr)
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{
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const u32 *p = (const u32 *)addr;
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return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0;
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}
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static inline bool variable_test_bit(int nr, const void *addr)
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{
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bool v;
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const u32 *p = (const u32 *)addr;
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asm("btl %2,%1" CC_SET(c) : CC_OUT(c) (v) : "m" (*p), "Ir" (nr));
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return v;
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}
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#define test_bit(nr,addr) \
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(__builtin_constant_p(nr) ? \
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constant_test_bit((nr),(addr)) : \
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variable_test_bit((nr),(addr)))
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static inline void set_bit(int nr, void *addr)
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{
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asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr));
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}
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#endif /* BOOT_BITOPS_H */
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