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43 lines
1.1 KiB
43 lines
1.1 KiB
/* -*- 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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* This file is part of the Linux kernel, and is made available under |
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* the terms of the GNU General Public License version 2. |
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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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static inline int 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 int variable_test_bit(int nr, const void *addr) |
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{ |
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u8 v; |
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const u32 *p = (const u32 *)addr; |
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asm("btl %2,%1; setc %0" : "=qm" (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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