/* * Copyright 2010 Tilera Corporation. All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. */ #ifndef _ASM_TILE_BITOPS_32_H #define _ASM_TILE_BITOPS_32_H #include <linux/compiler.h> #include <asm/atomic.h> #include <asm/system.h> /* Tile-specific routines to support <asm/bitops.h>. */ unsigned long _atomic_or(volatile unsigned long *p, unsigned long mask); unsigned long _atomic_andn(volatile unsigned long *p, unsigned long mask); unsigned long _atomic_xor(volatile unsigned long *p, unsigned long mask); /** * 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 set_bit(unsigned nr, volatile unsigned long *addr) { _atomic_or(addr + BIT_WORD(nr), BIT_MASK(nr)); } /** * 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. * See __clear_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. * * clear_bit() may 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() to ensure changes are visible on other cpus. */ static inline void clear_bit(unsigned nr, volatile unsigned long *addr) { _atomic_andn(addr + BIT_WORD(nr), BIT_MASK(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. * See __change_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 change_bit(unsigned nr, volatile unsigned long *addr) { _atomic_xor(addr + BIT_WORD(nr), BIT_MASK(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(unsigned nr, volatile unsigned long *addr) { unsigned long mask = BIT_MASK(nr); addr += BIT_WORD(nr); smp_mb(); /* barrier for proper semantics */ return (_atomic_or(addr, mask) & mask) != 0; } /** * 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(unsigned nr, volatile unsigned long *addr) { unsigned long mask = BIT_MASK(nr); addr += BIT_WORD(nr); smp_mb(); /* barrier for proper semantics */ return (_atomic_andn(addr, mask) & mask) != 0; } /** * 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(unsigned nr, volatile unsigned long *addr) { unsigned long mask = BIT_MASK(nr); addr += BIT_WORD(nr); smp_mb(); /* barrier for proper semantics */ return (_atomic_xor(addr, mask) & mask) != 0; } /* See discussion at smp_mb__before_atomic_dec() in <asm/atomic_32.h>. */ #define smp_mb__before_clear_bit() smp_mb() #define smp_mb__after_clear_bit() do {} while (0) #include <asm-generic/bitops/non-atomic.h> #include <asm-generic/bitops/ext2-atomic.h> #endif /* _ASM_TILE_BITOPS_32_H */