| /* -*- 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 <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 */ |
