| /* |
| * 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/ext2-atomic.h> |
| |
| #endif /* _ASM_TILE_BITOPS_32_H */ |