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Diffstat (limited to 'include/asm-x86/bitops.h')
| -rw-r--r-- | include/asm-x86/bitops.h | 321 |
1 files changed, 0 insertions, 321 deletions
diff --git a/include/asm-x86/bitops.h b/include/asm-x86/bitops.h deleted file mode 100644 index 1a23ce1a569..00000000000 --- a/include/asm-x86/bitops.h +++ /dev/null @@ -1,321 +0,0 @@ -#ifndef _ASM_X86_BITOPS_H -#define _ASM_X86_BITOPS_H - -/* - * Copyright 1992, Linus Torvalds. - */ - -#ifndef _LINUX_BITOPS_H -#error only <linux/bitops.h> can be included directly -#endif - -#include <linux/compiler.h> -#include <asm/alternative.h> - -/* - * 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). - */ - -#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 1) -/* Technically wrong, but this avoids compilation errors on some gcc - versions. */ -#define ADDR "=m" (*(volatile long *) addr) -#else -#define ADDR "+m" (*(volatile long *) addr) -#endif - -/** - * 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: there are no guarantees that this function will not be reordered - * on non x86 architectures, so if you are writing portable code, - * make sure not to rely on its reordering guarantees. - * - * Note that @nr may be almost arbitrarily large; this function is not - * restricted to acting on a single-word quantity. - */ -static inline void set_bit(int nr, volatile void *addr) -{ - asm volatile(LOCK_PREFIX "bts %1,%0" - : ADDR - : "Ir" (nr) : "memory"); -} - -/** - * __set_bit - Set a bit in memory - * @nr: the bit to set - * @addr: the address to start counting from - * - * Unlike set_bit(), this function is non-atomic and may be reordered. - * If it's called on the same region of memory simultaneously, the effect - * may be that only one operation succeeds. - */ -static inline void __set_bit(int nr, volatile void *addr) -{ - asm volatile("bts %1,%0" - : ADDR - : "Ir" (nr) : "memory"); -} - - -/** - * clear_bit - Clears a bit in memory - * @nr: Bit to clear - * @addr: Address to start counting from - * - * 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 clear_bit(int nr, volatile void *addr) -{ - asm volatile(LOCK_PREFIX "btr %1,%0" - : ADDR - : "Ir" (nr)); -} - -/* - * clear_bit_unlock - Clears a bit in memory - * @nr: Bit to clear - * @addr: Address to start counting from - * - * clear_bit() is atomic and implies release semantics before the memory - * operation. It can be used for an unlock. - */ -static inline void clear_bit_unlock(unsigned nr, volatile void *addr) -{ - barrier(); - clear_bit(nr, addr); -} - -static inline void __clear_bit(int nr, volatile void *addr) -{ - asm volatile("btr %1,%0" : ADDR : "Ir" (nr)); -} - -/* - * __clear_bit_unlock - Clears a bit in memory - * @nr: Bit to clear - * @addr: Address to start counting from - * - * __clear_bit() is non-atomic and implies release semantics before the memory - * operation. It can be used for an unlock if no other CPUs can concurrently - * modify other bits in the word. - * - * No memory barrier is required here, because x86 cannot reorder stores past - * older loads. Same principle as spin_unlock. - */ -static inline void __clear_bit_unlock(unsigned nr, volatile void *addr) -{ - barrier(); - __clear_bit(nr, addr); -} - -#define smp_mb__before_clear_bit() barrier() -#define smp_mb__after_clear_bit() barrier() - -/** - * __change_bit - Toggle a bit in memory - * @nr: the bit to change - * @addr: the address to start counting from - * - * Unlike change_bit(), this function is non-atomic and may be reordered. - * If it's called on the same region of memory simultaneously, the effect - * may be that only one operation succeeds. - */ -static inline void __change_bit(int nr, volatile void *addr) -{ - asm volatile("btc %1,%0" : ADDR : "Ir" (nr)); -} - -/** - * change_bit - Toggle a bit in memory - * @nr: Bit to change - * @addr: Address to start counting from - * - * 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 change_bit(int nr, volatile void *addr) -{ - asm volatile(LOCK_PREFIX "btc %1,%0" - : ADDR : "Ir" (nr)); -} - -/** - * 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 test_and_set_bit(int nr, volatile void *addr) -{ - int oldbit; - - asm volatile(LOCK_PREFIX "bts %2,%1\n\t" - "sbb %0,%0" - : "=r" (oldbit), ADDR - : "Ir" (nr) : "memory"); - - return oldbit; -} - -/** - * test_and_set_bit_lock - Set a bit and return its old value for lock - * @nr: Bit to set - * @addr: Address to count from - * - * This is the same as test_and_set_bit on x86. - */ -static inline int test_and_set_bit_lock(int nr, volatile void *addr) -{ - return test_and_set_bit(nr, addr); -} - -/** - * __test_and_set_bit - Set a bit and return its old value - * @nr: Bit to set - * @addr: Address to count from - * - * This operation is non-atomic and can be reordered. - * If two examples of this operation race, one can appear to succeed - * but actually fail. You must protect multiple accesses with a lock. - */ -static inline int __test_and_set_bit(int nr, volatile void *addr) -{ - int oldbit; - - asm("bts %2,%1\n\t" - "sbb %0,%0" - : "=r" (oldbit), ADDR - : "Ir" (nr)); - return oldbit; -} - -/** - * 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 test_and_clear_bit(int nr, volatile void *addr) -{ - int oldbit; - - asm volatile(LOCK_PREFIX "btr %2,%1\n\t" - "sbb %0,%0" - : "=r" (oldbit), ADDR - : "Ir" (nr) : "memory"); - - return oldbit; -} - -/** - * __test_and_clear_bit - Clear a bit and return its old value - * @nr: Bit to clear - * @addr: Address to count from - * - * This operation is non-atomic and can be reordered. - * If two examples of this operation race, one can appear to succeed - * but actually fail. You must protect multiple accesses with a lock. - */ -static inline int __test_and_clear_bit(int nr, volatile void *addr) -{ - int oldbit; - - asm volatile("btr %2,%1\n\t" - "sbb %0,%0" - : "=r" (oldbit), ADDR - : "Ir" (nr)); - return oldbit; -} - -/* WARNING: non atomic and it can be reordered! */ -static inline int __test_and_change_bit(int nr, volatile void *addr) -{ - int oldbit; - - asm volatile("btc %2,%1\n\t" - "sbb %0,%0" - : "=r" (oldbit), ADDR - : "Ir" (nr) : "memory"); - - return oldbit; -} - -/** - * 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 test_and_change_bit(int nr, volatile void *addr) -{ - int oldbit; - - asm volatile(LOCK_PREFIX "btc %2,%1\n\t" - "sbb %0,%0" - : "=r" (oldbit), ADDR - : "Ir" (nr) : "memory"); - - return oldbit; -} - -static inline int constant_test_bit(int nr, const volatile void *addr) -{ - return ((1UL << (nr % BITS_PER_LONG)) & - (((unsigned long *)addr)[nr / BITS_PER_LONG])) != 0; -} - -static inline int variable_test_bit(int nr, volatile const void *addr) -{ - int oldbit; - - asm volatile("bt %2,%1\n\t" - "sbb %0,%0" - : "=r" (oldbit) - : "m" (*(unsigned long *)addr), "Ir" (nr)); - - return oldbit; -} - -#if 0 /* Fool kernel-doc since it doesn't do macros yet */ -/** - * test_bit - Determine whether a bit is set - * @nr: bit number to test - * @addr: Address to start counting from - */ -static int test_bit(int nr, const volatile unsigned long *addr); -#endif - -#define test_bit(nr,addr) \ - (__builtin_constant_p(nr) ? \ - constant_test_bit((nr),(addr)) : \ - variable_test_bit((nr),(addr))) - -#undef ADDR - -#ifdef CONFIG_X86_32 -# include "bitops_32.h" -#else -# include "bitops_64.h" -#endif - -#endif /* _ASM_X86_BITOPS_H */ |