forked from Minki/linux
5fb682b064
This is a grab bag of changes with no actual change to generated code. This includes whitespace and comment typos, plus a couple of stale comments being removed. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
133 lines
4.2 KiB
C
133 lines
4.2 KiB
C
/*
|
|
* 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 */
|