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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 b47a1d0b8a8..00000000000 --- a/include/asm-x86/sync_bitops.h +++ /dev/null @@ -1,130 +0,0 @@ -#ifndef _I386_SYNC_BITOPS_H -#define _I386_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 /* _I386_SYNC_BITOPS_H */ |