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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/tile/include/asm/bitops_64.h
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/*

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 * Copyright 2011 Tilera Corporation. All Rights Reserved.

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 *

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 *   This program is free software; you can redistribute it and/or

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 *   modify it under the terms of the GNU General Public License

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 *   as published by the Free Software Foundation, version 2.

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 *

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 *   This program is distributed in the hope that it will be useful, but

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 *   WITHOUT ANY WARRANTY; without even the implied warranty of

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 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or

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 *   NON INFRINGEMENT.  See the GNU General Public License for

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 *   more details.

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 */

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#ifndef _ASM_TILE_BITOPS_64_H

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#define _ASM_TILE_BITOPS_64_H

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#include <linux/compiler.h>

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#include <asm/atomic.h>

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#include <asm/system.h>

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/* See <asm/bitops.h> for API comments. */

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static inline void set_bit(unsigned nr, volatile unsigned long *addr)

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{

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	unsigned long mask = (1UL << (nr % BITS_PER_LONG));

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	__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask);

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}

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static inline void clear_bit(unsigned nr, volatile unsigned long *addr)

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{

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	unsigned long mask = (1UL << (nr % BITS_PER_LONG));

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	__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask);

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}

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#define smp_mb__before_clear_bit()	smp_mb()

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#define smp_mb__after_clear_bit()	smp_mb()

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static inline void change_bit(unsigned nr, volatile unsigned long *addr)

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{

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	unsigned long old, mask = (1UL << (nr % BITS_PER_LONG));

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	long guess, oldval;

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	addr += nr / BITS_PER_LONG;

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	old = *addr;

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	do {

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		guess = oldval;

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		oldval = atomic64_cmpxchg((atomic64_t *)addr,

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					  guess, guess ^ mask);

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	} while (guess != oldval);

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}

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/*

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 * The test_and_xxx_bit() routines require a memory fence before we

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 * start the operation, and after the operation completes.  We use

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 * smp_mb() before, and rely on the "!= 0" comparison, plus a compiler

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 * barrier(), to block until the atomic op is complete.

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 */

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static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)

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{

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	int val;

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	unsigned long mask = (1UL << (nr % BITS_PER_LONG));

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	smp_mb();  /* barrier for proper semantics */

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	val = (__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask)

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	       & mask) != 0;

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	barrier();

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	return val;

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}

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static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)

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{

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	int val;

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	unsigned long mask = (1UL << (nr % BITS_PER_LONG));

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	smp_mb();  /* barrier for proper semantics */

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	val = (__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask)

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	       & mask) != 0;

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	barrier();

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	return val;

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}

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static inline int test_and_change_bit(unsigned nr,

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				      volatile unsigned long *addr)

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{

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	unsigned long mask = (1UL << (nr % BITS_PER_LONG));

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	long guess, oldval = *addr;

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	addr += nr / BITS_PER_LONG;

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	oldval = *addr;

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	do {

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		guess = oldval;

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		oldval = atomic64_cmpxchg((atomic64_t *)addr,

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					  guess, guess ^ mask);

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	} while (guess != oldval);

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	return (oldval & mask) != 0;

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}

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#define ext2_set_bit_atomic(lock, nr, addr)			\

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	test_and_set_bit((nr), (unsigned long *)(addr))

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#define ext2_clear_bit_atomic(lock, nr, addr)			\

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	test_and_clear_bit((nr), (unsigned long *)(addr))

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#endif /* _ASM_TILE_BITOPS_64_H */

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