From ad7e906d5687bb076fe6c3c980d6e013a3a42bde Mon Sep 17 00:00:00 2001 From: "H. Peter Anvin" Date: Wed, 11 Jul 2007 12:18:40 -0700 Subject: Simple bitops for the new x86 setup code. A simple collection of bitops for the new x86 setup code. Signed-off-by: H. Peter Anvin Signed-off-by: Linus Torvalds --- arch/i386/boot/bitops.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 arch/i386/boot/bitops.h (limited to 'arch/i386/boot/bitops.h') diff --git a/arch/i386/boot/bitops.h b/arch/i386/boot/bitops.h new file mode 100644 index 00000000000..8dcc8dc7db8 --- /dev/null +++ b/arch/i386/boot/bitops.h @@ -0,0 +1,45 @@ +/* -*- 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. + * + * ----------------------------------------------------------------------- */ + +/* + * arch/i386/boot/bitops.h + * + * Very simple bitops for the boot code. + */ + +#ifndef BOOT_BITOPS_H +#define BOOT_BITOPS_H +#define _LINUX_BITOPS_H /* Inhibit inclusion of */ + +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 */ -- cgit v1.2.3