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