arch/tile/include/asm/bitops_64.h

   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
  23 static 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
  29 static 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
  39 static inline void change_bit(unsigned nr, volatile unsigned long *addr)
  40 {
  41         unsigned long old, mask = (1UL << (nr % BITS_PER_LONG));
  42         long guess, oldval;
  43         addr += nr / BITS_PER_LONG;
  44         old = *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
  60 static 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
  72 static 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
  84 static inline int test_and_change_bit(unsigned nr,
  85                                       volatile unsigned long *addr)
  86 {
  87         unsigned long mask = (1UL << (nr % BITS_PER_LONG));
  88         long guess, oldval = *addr;
  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 */