include/asm-v850/bitops.h

   1 /*
   2  * include/asm-v850/bitops.h -- Bit operations
   3  *
   4  *  Copyright (C) 2001,02,03,04,05  NEC Electronics Corporation
   5  *  Copyright (C) 2001,02,03,04,05  Miles Bader <miles@gnu.org>
   6  *  Copyright (C) 1992  Linus Torvalds.
   7  *
   8  * This file is subject to the terms and conditions of the GNU General
   9  * Public License.  See the file COPYING in the main directory of this
  10  * archive for more details.
  11  */
  12
  13 #ifndef __V850_BITOPS_H__
  14 #define __V850_BITOPS_H__
  15
  16
  17 #include <linux/compiler.h>     /* unlikely  */
  18 #include <asm/byteorder.h>      /* swab32 */
  19 #include <asm/system.h>         /* interrupt enable/disable */
  20
  21
  22 #ifdef __KERNEL__
  23
  24 #include <asm-generic/bitops/ffz.h>
  25
  26 /*
  27  * The __ functions are not atomic
  28  */
  29
  30 /* In the following constant-bit-op macros, a "g" constraint is used when
  31    we really need an integer ("i" constraint).  This is to avoid
  32    warnings/errors from the compiler in the case where the associated
  33    operand _isn't_ an integer, and shouldn't produce bogus assembly because
  34    use of that form is protected by a guard statement that checks for
  35    constants, and should otherwise be removed by the optimizer.  This
  36    _usually_ works -- however, __builtin_constant_p returns true for a
  37    variable with a known constant value too, and unfortunately gcc will
  38    happily put the variable in a register and use the register for the "g"
  39    constraint'd asm operand.  To avoid the latter problem, we add a
  40    constant offset to the operand and subtract it back in the asm code;
  41    forcing gcc to do arithmetic on the value is usually enough to get it
  42    to use a real constant value.  This is horrible, and ultimately
  43    unreliable too, but it seems to work for now (hopefully gcc will offer
  44    us more control in the future, so we can do a better job).  */
  45
  46 #define __const_bit_op(op, nr, addr)                                    \
  47   ({ __asm__ (op " (%0 - 0x123), %1"                                    \
  48               :: "g" (((nr) & 0x7) + 0x123),                            \
  49                  "m" (*((char *)(addr) + ((nr) >> 3)))                  \
  50               : "memory"); })
  51 #define __var_bit_op(op, nr, addr)                                      \
  52   ({ int __nr = (nr);                                                   \
  53      __asm__ (op " %0, [%1]"                                            \
  54               :: "r" (__nr & 0x7),                                      \
  55                  "r" ((char *)(addr) + (__nr >> 3))                     \
  56               : "memory"); })
  57 #define __bit_op(op, nr, addr)                                          \
  58   ((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF)             \
  59    ? __const_bit_op (op, nr, addr)                                      \
  60    : __var_bit_op (op, nr, addr))
  61
  62 #define __set_bit(nr, addr)             __bit_op ("set1", nr, addr)
  63 #define __clear_bit(nr, addr)           __bit_op ("clr1", nr, addr)
  64 #define __change_bit(nr, addr)          __bit_op ("not1", nr, addr)
  65
  66 /* The bit instructions used by `non-atomic' variants are actually atomic.  */
  67 #define set_bit __set_bit
  68 #define clear_bit __clear_bit
  69 #define change_bit __change_bit
  70
  71
  72 #define __const_tns_bit_op(op, nr, addr)                                      \
  73   ({ int __tns_res;                                                           \
  74      __asm__ __volatile__ (                                                   \
  75              "tst1 (%1 - 0x123), %2; setf nz, %0; " op " (%1 - 0x123), %2"    \
  76              : "=&r" (__tns_res)                                              \
  77              : "g" (((nr) & 0x7) + 0x123),                                    \
  78                "m" (*((char *)(addr) + ((nr) >> 3)))                          \
  79              : "memory");                                                     \
  80      __tns_res;                                                               \
  81   })
  82 #define __var_tns_bit_op(op, nr, addr)                                        \
  83   ({ int __nr = (nr);                                                         \
  84      int __tns_res;                                                           \
  85      __asm__ __volatile__ (                                                   \
  86              "tst1 %1, [%2]; setf nz, %0; " op " %1, [%2]"                    \
  87               : "=&r" (__tns_res)                                             \
  88               : "r" (__nr & 0x7),                                             \
  89                 "r" ((char *)(addr) + (__nr >> 3))                            \
  90               : "memory");                                                    \
  91      __tns_res;                                                               \
  92   })
  93 #define __tns_bit_op(op, nr, addr)                                      \
  94   ((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF)             \
  95    ? __const_tns_bit_op (op, nr, addr)                                  \
  96    : __var_tns_bit_op (op, nr, addr))
  97 #define __tns_atomic_bit_op(op, nr, addr)                               \
  98   ({ int __tns_atomic_res, __tns_atomic_flags;                          \
  99      local_irq_save (__tns_atomic_flags);                               \
 100      __tns_atomic_res = __tns_bit_op (op, nr, addr);                    \
 101      local_irq_restore (__tns_atomic_flags);                            \
 102      __tns_atomic_res;                                                  \
 103   })
 104
 105 #define __test_and_set_bit(nr, addr)    __tns_bit_op ("set1", nr, addr)
 106 #define test_and_set_bit(nr, addr)      __tns_atomic_bit_op ("set1", nr, addr)
 107
 108 #define __test_and_clear_bit(nr, addr)  __tns_bit_op ("clr1", nr, addr)
 109 #define test_and_clear_bit(nr, addr)    __tns_atomic_bit_op ("clr1", nr, addr)
 110
 111 #define __test_and_change_bit(nr, addr) __tns_bit_op ("not1", nr, addr)
 112 #define test_and_change_bit(nr, addr)   __tns_atomic_bit_op ("not1", nr, addr)
 113
 114
 115 #define __const_test_bit(nr, addr)                                            \
 116   ({ int __test_bit_res;                                                      \
 117      __asm__ __volatile__ ("tst1 (%1 - 0x123), %2; setf nz, %0"               \
 118                            : "=r" (__test_bit_res)                            \
 119                            : "g" (((nr) & 0x7) + 0x123),                      \
 120                              "m" (*((const char *)(addr) + ((nr) >> 3))));    \
 121      __test_bit_res;                                                          \
 122   })
 123 static inline int __test_bit (int nr, const void *addr)
 124 {
 125         int res;
 126         __asm__ __volatile__ ("tst1 %1, [%2]; setf nz, %0"
 127                               : "=r" (res)
 128                               : "r" (nr & 0x7), "r" (addr + (nr >> 3)));
 129         return res;
 130 }
 131 #define test_bit(nr,addr)                                               \
 132   ((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF)             \
 133    ? __const_test_bit ((nr), (addr))                                    \
 134    : __test_bit ((nr), (addr)))
 135
 136
 137 /* clear_bit doesn't provide any barrier for the compiler.  */
 138 #define smp_mb__before_clear_bit()      barrier ()
 139 #define smp_mb__after_clear_bit()       barrier ()
 140
 141 #include <asm-generic/bitops/ffs.h>
 142 #include <asm-generic/bitops/fls.h>
 143 #include <asm-generic/bitops/fls64.h>
 144 #include <asm-generic/bitops/__ffs.h>
 145 #include <asm-generic/bitops/find.h>
 146 #include <asm-generic/bitops/sched.h>
 147 #include <asm-generic/bitops/hweight.h>
 148
 149 #include <asm-generic/bitops/ext2-non-atomic.h>
 150 #define ext2_set_bit_atomic(l,n,a)      test_and_set_bit(n,a)
 151 #define ext2_clear_bit_atomic(l,n,a)    test_and_clear_bit(n,a)
 152
 153 #include <asm-generic/bitops/minix.h>
 154
 155 #endif /* __KERNEL__ */
 156
 157 #endif /* __V850_BITOPS_H__ */