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author | Al Viro <viro@zeniv.linux.org.uk> | 2008-08-18 05:05:42 +0400 |
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committer | H. Peter Anvin <hpa@zytor.com> | 2008-10-23 09:55:20 +0400 |
commit | bb8985586b7a906e116db835c64773b7a7d51663 (patch) | |
tree | de93ae58e88cc563d95cc124a73f3930594c6100 /include/asm-x86/sync_bitops.h | |
parent | 8ede0bdb63305d3353efd97e9af6210afb05734e (diff) | |
download | linux-bb8985586b7a906e116db835c64773b7a7d51663.tar.xz |
x86, um: ... and asm-x86 move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'include/asm-x86/sync_bitops.h')
-rw-r--r-- | include/asm-x86/sync_bitops.h | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/include/asm-x86/sync_bitops.h b/include/asm-x86/sync_bitops.h deleted file mode 100644 index b689bee71104..000000000000 --- a/include/asm-x86/sync_bitops.h +++ /dev/null @@ -1,130 +0,0 @@ -#ifndef ASM_X86__SYNC_BITOPS_H -#define ASM_X86__SYNC_BITOPS_H - -/* - * Copyright 1992, Linus Torvalds. - */ - -/* - * These have to be done with inline assembly: that way the bit-setting - * is guaranteed to be atomic. All bit operations return 0 if the bit - * was cleared before the operation and != 0 if it was not. - * - * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). - */ - -#define ADDR (*(volatile long *)addr) - -/** - * sync_set_bit - Atomically set a bit in memory - * @nr: the bit to set - * @addr: the address to start counting from - * - * This function is atomic and may not be reordered. See __set_bit() - * if you do not require the atomic guarantees. - * - * Note that @nr may be almost arbitrarily large; this function is not - * restricted to acting on a single-word quantity. - */ -static inline void sync_set_bit(int nr, volatile unsigned long *addr) -{ - asm volatile("lock; btsl %1,%0" - : "+m" (ADDR) - : "Ir" (nr) - : "memory"); -} - -/** - * sync_clear_bit - Clears a bit in memory - * @nr: Bit to clear - * @addr: Address to start counting from - * - * sync_clear_bit() is atomic and may not be reordered. However, it does - * not contain a memory barrier, so if it is used for locking purposes, - * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit() - * in order to ensure changes are visible on other processors. - */ -static inline void sync_clear_bit(int nr, volatile unsigned long *addr) -{ - asm volatile("lock; btrl %1,%0" - : "+m" (ADDR) - : "Ir" (nr) - : "memory"); -} - -/** - * sync_change_bit - Toggle a bit in memory - * @nr: Bit to change - * @addr: Address to start counting from - * - * sync_change_bit() is atomic and may not be reordered. - * Note that @nr may be almost arbitrarily large; this function is not - * restricted to acting on a single-word quantity. - */ -static inline void sync_change_bit(int nr, volatile unsigned long *addr) -{ - asm volatile("lock; btcl %1,%0" - : "+m" (ADDR) - : "Ir" (nr) - : "memory"); -} - -/** - * sync_test_and_set_bit - Set a bit and return its old value - * @nr: Bit to set - * @addr: Address to count from - * - * This operation is atomic and cannot be reordered. - * It also implies a memory barrier. - */ -static inline int sync_test_and_set_bit(int nr, volatile unsigned long *addr) -{ - int oldbit; - - asm volatile("lock; btsl %2,%1\n\tsbbl %0,%0" - : "=r" (oldbit), "+m" (ADDR) - : "Ir" (nr) : "memory"); - return oldbit; -} - -/** - * sync_test_and_clear_bit - Clear a bit and return its old value - * @nr: Bit to clear - * @addr: Address to count from - * - * This operation is atomic and cannot be reordered. - * It also implies a memory barrier. - */ -static inline int sync_test_and_clear_bit(int nr, volatile unsigned long *addr) -{ - int oldbit; - - asm volatile("lock; btrl %2,%1\n\tsbbl %0,%0" - : "=r" (oldbit), "+m" (ADDR) - : "Ir" (nr) : "memory"); - return oldbit; -} - -/** - * sync_test_and_change_bit - Change a bit and return its old value - * @nr: Bit to change - * @addr: Address to count from - * - * This operation is atomic and cannot be reordered. - * It also implies a memory barrier. - */ -static inline int sync_test_and_change_bit(int nr, volatile unsigned long *addr) -{ - int oldbit; - - asm volatile("lock; btcl %2,%1\n\tsbbl %0,%0" - : "=r" (oldbit), "+m" (ADDR) - : "Ir" (nr) : "memory"); - return oldbit; -} - -#define sync_test_bit(nr, addr) test_bit(nr, addr) - -#undef ADDR - -#endif /* ASM_X86__SYNC_BITOPS_H */ |