include/asm-frv/bitops.h

   1 /* bitops.h: bit operations for the Fujitsu FR-V CPUs
   2  *
   3  * For an explanation of how atomic ops work in this arch, see:
   4  *   Documentation/fujitsu/frv/atomic-ops.txt
   5  *
   6  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   7  * Written by David Howells (dhowells@redhat.com)
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14 #ifndef _ASM_BITOPS_H
  15 #define _ASM_BITOPS_H
  16
  17 #include <linux/config.h>
  18 #include <linux/compiler.h>
  19 #include <asm/byteorder.h>
  20 #include <asm/system.h>
  21 #include <asm/atomic.h>
  22
  23 #ifdef __KERNEL__
  24
  25 #include <asm-generic/bitops/ffz.h>
  26
  27 /*
  28  * clear_bit() doesn't provide any barrier for the compiler.
  29  */
  30 #define smp_mb__before_clear_bit()      barrier()
  31 #define smp_mb__after_clear_bit()       barrier()
  32
  33 static inline int test_and_clear_bit(int nr, volatile void *addr)
  34 {
  35         volatile unsigned long *ptr = addr;
  36         unsigned long mask = 1UL << (nr & 31);
  37         ptr += nr >> 5;
  38         return (atomic_test_and_ANDNOT_mask(mask, ptr) & mask) != 0;
  39 }
  40
  41 static inline int test_and_set_bit(int nr, volatile void *addr)
  42 {
  43         volatile unsigned long *ptr = addr;
  44         unsigned long mask = 1UL << (nr & 31);
  45         ptr += nr >> 5;
  46         return (atomic_test_and_OR_mask(mask, ptr) & mask) != 0;
  47 }
  48
  49 static inline int test_and_change_bit(int nr, volatile void *addr)
  50 {
  51         volatile unsigned long *ptr = addr;
  52         unsigned long mask = 1UL << (nr & 31);
  53         ptr += nr >> 5;
  54         return (atomic_test_and_XOR_mask(mask, ptr) & mask) != 0;
  55 }
  56
  57 static inline void clear_bit(int nr, volatile void *addr)
  58 {
  59         test_and_clear_bit(nr, addr);
  60 }
  61
  62 static inline void set_bit(int nr, volatile void *addr)
  63 {
  64         test_and_set_bit(nr, addr);
  65 }
  66
  67 static inline void change_bit(int nr, volatile void * addr)
  68 {
  69         test_and_change_bit(nr, addr);
  70 }
  71
  72 static inline void __clear_bit(int nr, volatile void * addr)
  73 {
  74         volatile unsigned long *a = addr;
  75         int mask;
  76
  77         a += nr >> 5;
  78         mask = 1 << (nr & 31);
  79         *a &= ~mask;
  80 }
  81
  82 static inline void __set_bit(int nr, volatile void * addr)
  83 {
  84         volatile unsigned long *a = addr;
  85         int mask;
  86
  87         a += nr >> 5;
  88         mask = 1 << (nr & 31);
  89         *a |= mask;
  90 }
  91
  92 static inline void __change_bit(int nr, volatile void *addr)
  93 {
  94         volatile unsigned long *a = addr;
  95         int mask;
  96
  97         a += nr >> 5;
  98         mask = 1 << (nr & 31);
  99         *a ^= mask;
 100 }
 101
 102 static inline int __test_and_clear_bit(int nr, volatile void * addr)
 103 {
 104         volatile unsigned long *a = addr;
 105         int mask, retval;
 106
 107         a += nr >> 5;
 108         mask = 1 << (nr & 31);
 109         retval = (mask & *a) != 0;
 110         *a &= ~mask;
 111         return retval;
 112 }
 113
 114 static inline int __test_and_set_bit(int nr, volatile void * addr)
 115 {
 116         volatile unsigned long *a = addr;
 117         int mask, retval;
 118
 119         a += nr >> 5;
 120         mask = 1 << (nr & 31);
 121         retval = (mask & *a) != 0;
 122         *a |= mask;
 123         return retval;
 124 }
 125
 126 static inline int __test_and_change_bit(int nr, volatile void * addr)
 127 {
 128         volatile unsigned long *a = addr;
 129         int mask, retval;
 130
 131         a += nr >> 5;
 132         mask = 1 << (nr & 31);
 133         retval = (mask & *a) != 0;
 134         *a ^= mask;
 135         return retval;
 136 }
 137
 138 /*
 139  * This routine doesn't need to be atomic.
 140  */
 141 static inline int __constant_test_bit(int nr, const volatile void * addr)
 142 {
 143         return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
 144 }
 145
 146 static inline int __test_bit(int nr, const volatile void * addr)
 147 {
 148         int     * a = (int *) addr;
 149         int     mask;
 150
 151         a += nr >> 5;
 152         mask = 1 << (nr & 0x1f);
 153         return ((mask & *a) != 0);
 154 }
 155
 156 #define test_bit(nr,addr) \
 157 (__builtin_constant_p(nr) ? \
 158  __constant_test_bit((nr),(addr)) : \
 159  __test_bit((nr),(addr)))
 160
 161 #include <asm-generic/bitops/ffs.h>
 162 #include <asm-generic/bitops/__ffs.h>
 163 #include <asm-generic/bitops/find.h>
 164
 165 /*
 166  * fls: find last bit set.
 167  */
 168 #define fls(x)                                          \
 169 ({                                                      \
 170         int bit;                                        \
 171                                                         \
 172         asm("scan %1,gr0,%0" : "=r"(bit) : "r"(x));     \
 173                                                         \
 174         bit ? 33 - bit : bit;                           \
 175 })
 176
 177 #include <asm-generic/bitops/fls64.h>
 178 #include <asm-generic/bitops/sched.h>
 179 #include <asm-generic/bitops/hweight.h>
 180
 181 #include <asm-generic/bitops/ext2-non-atomic.h>
 182
 183 #define ext2_set_bit_atomic(lock,nr,addr)       test_and_set_bit  ((nr) ^ 0x18, (addr))
 184 #define ext2_clear_bit_atomic(lock,nr,addr)     test_and_clear_bit((nr) ^ 0x18, (addr))
 185
 186 #include <asm-generic/bitops/minix-le.h>
 187
 188 #endif /* __KERNEL__ */
 189
 190 #endif /* _ASM_BITOPS_H */