1/*
  2 * Copyright 2011 Tilera Corporation. All Rights Reserved.
  3 *
  4 *   This program is free software; you can redistribute it and/or
  5 *   modify it under the terms of the GNU General Public License
  6 *   as published by the Free Software Foundation, version 2.
  7 *
  8 *   This program is distributed in the hope that it will be useful, but
  9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 11 *   NON INFRINGEMENT.  See the GNU General Public License for
 12 *   more details.
 13 */
 14
 15#ifndef _ASM_TILE_BITOPS_64_H
 16#define _ASM_TILE_BITOPS_64_H
 17
 18#include <linux/compiler.h>
 19#include <linux/atomic.h>
 20
 21/* See <asm/bitops.h> for API comments. */
 22
 23static inline void set_bit(unsigned nr, volatile unsigned long *addr)
 24{
 25	unsigned long mask = (1UL << (nr % BITS_PER_LONG));
 26	__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask);
 27}
 28
 29static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
 30{
 31	unsigned long mask = (1UL << (nr % BITS_PER_LONG));
 32	__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask);
 33}
 34
 35#define smp_mb__before_clear_bit()	smp_mb()
 36#define smp_mb__after_clear_bit()	smp_mb()
 37
 38
 39static inline void change_bit(unsigned nr, volatile unsigned long *addr)
 40{
 41	unsigned long mask = (1UL << (nr % BITS_PER_LONG));
 42	unsigned long guess, oldval;
 43	addr += nr / BITS_PER_LONG;
 44	oldval = *addr;
 45	do {
 46		guess = oldval;
 47		oldval = atomic64_cmpxchg((atomic64_t *)addr,
 48					  guess, guess ^ mask);
 49	} while (guess != oldval);
 50}
 51
 52
 53/*
 54 * The test_and_xxx_bit() routines require a memory fence before we
 55 * start the operation, and after the operation completes.  We use
 56 * smp_mb() before, and rely on the "!= 0" comparison, plus a compiler
 57 * barrier(), to block until the atomic op is complete.
 58 */
 59
 60static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)
 61{
 62	int val;
 63	unsigned long mask = (1UL << (nr % BITS_PER_LONG));
 64	smp_mb();  /* barrier for proper semantics */
 65	val = (__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask)
 66	       & mask) != 0;
 67	barrier();
 68	return val;
 69}
 70
 71
 72static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)
 73{
 74	int val;
 75	unsigned long mask = (1UL << (nr % BITS_PER_LONG));
 76	smp_mb();  /* barrier for proper semantics */
 77	val = (__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask)
 78	       & mask) != 0;
 79	barrier();
 80	return val;
 81}
 82
 83
 84static inline int test_and_change_bit(unsigned nr,
 85				      volatile unsigned long *addr)
 86{
 87	unsigned long mask = (1UL << (nr % BITS_PER_LONG));
 88	unsigned long guess, oldval;
 89	addr += nr / BITS_PER_LONG;
 90	oldval = *addr;
 91	do {
 92		guess = oldval;
 93		oldval = atomic64_cmpxchg((atomic64_t *)addr,
 94					  guess, guess ^ mask);
 95	} while (guess != oldval);
 96	return (oldval & mask) != 0;
 97}
 98
 99#include <asm-generic/bitops/ext2-atomic-setbit.h>
100
101#endif /* _ASM_TILE_BITOPS_64_H */