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/
usr/
src/
linux-headers-3.0.0-14/
arch/
tile/
include/
asm/
- drwxr-xr-x
|
Viewing file:  bitops_64.h (2.97 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
/*
* Copyright 2011 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_64_H
#define _ASM_TILE_BITOPS_64_H
#include <linux/compiler.h>
#include <asm/atomic.h>
#include <asm/system.h>
/* See <asm/bitops.h> for API comments. */
static inline void set_bit(unsigned nr, volatile unsigned long *addr)
{
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask);
}
static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
{
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask);
}
#define smp_mb__before_clear_bit() smp_mb()
#define smp_mb__after_clear_bit() smp_mb()
static inline void change_bit(unsigned nr, volatile unsigned long *addr)
{
unsigned long old, mask = (1UL << (nr % BITS_PER_LONG));
long guess, oldval;
addr += nr / BITS_PER_LONG;
old = *addr;
do {
guess = oldval;
oldval = atomic64_cmpxchg((atomic64_t *)addr,
guess, guess ^ mask);
} while (guess != oldval);
}
/*
* The test_and_xxx_bit() routines require a memory fence before we
* start the operation, and after the operation completes. We use
* smp_mb() before, and rely on the "!= 0" comparison, plus a compiler
* barrier(), to block until the atomic op is complete.
*/
static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)
{
int val;
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
smp_mb(); /* barrier for proper semantics */
val = (__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask)
& mask) != 0;
barrier();
return val;
}
static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)
{
int val;
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
smp_mb(); /* barrier for proper semantics */
val = (__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask)
& mask) != 0;
barrier();
return val;
}
static inline int test_and_change_bit(unsigned nr,
volatile unsigned long *addr)
{
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
long guess, oldval = *addr;
addr += nr / BITS_PER_LONG;
oldval = *addr;
do {
guess = oldval;
oldval = atomic64_cmpxchg((atomic64_t *)addr,
guess, guess ^ mask);
} while (guess != oldval);
return (oldval & mask) != 0;
}
#define ext2_set_bit_atomic(lock, nr, addr) \
test_and_set_bit((nr), (unsigned long *)(addr))
#define ext2_clear_bit_atomic(lock, nr, addr) \
test_and_clear_bit((nr), (unsigned long *)(addr))
#endif /* _ASM_TILE_BITOPS_64_H */
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