kernel/arch/h8300/include/asm/bitops.h

   1 #ifndef _H8300_BITOPS_H
   2 #define _H8300_BITOPS_H
   3
   4 /*
   5  * Copyright 1992, Linus Torvalds.
   6  * Copyright 2002, Yoshinori Sato
   7  */
   8
   9 #include <linux/compiler.h>
  10
  11 #ifdef __KERNEL__
  12
  13 #ifndef _LINUX_BITOPS_H
  14 #error only <linux/bitops.h> can be included directly
  15 #endif
  16
  17 /*
  18  * Function prototypes to keep gcc -Wall happy
  19  */
  20
  21 /*
  22  * ffz = Find First Zero in word. Undefined if no zero exists,
  23  * so code should check against ~0UL first..
  24  */
  25 static inline unsigned long ffz(unsigned long word)
  26 {
  27         unsigned long result;
  28
  29         result = -1;
  30         __asm__("1:\n\t"
  31                 "shlr.l %2\n\t"
  32                 "adds #1,%0\n\t"
  33                 "bcs 1b"
  34                 : "=r"(result)
  35                 : "0"(result), "r"(word));
  36         return result;
  37 }
  38
  39 #define H8300_GEN_BITOP(FNAME, OP)                              \
  40 static inline void FNAME(int nr, volatile unsigned long *addr)  \
  41 {                                                               \
  42         unsigned char *b_addr;                                  \
  43         unsigned char bit = nr & 7;                             \
  44                                                                 \
  45         b_addr = (unsigned char *)addr + ((nr >> 3) ^ 3);       \
  46         if (__builtin_constant_p(nr)) {                         \
  47                 __asm__(OP " %1,%0" : "+WU"(*b_addr) : "i"(nr & 7));    \
  48         } else {                                                \
  49                 __asm__(OP " %s1,%0" : "+WU"(*b_addr) : "r"(bit));      \
  50         }                                                       \
  51 }
  52
  53 /*
  54  * clear_bit() doesn't provide any barrier for the compiler.
  55  */
  56 #define smp_mb__before_clear_bit()      barrier()
  57 #define smp_mb__after_clear_bit()       barrier()
  58
  59 H8300_GEN_BITOP(set_bit,    "bset")
  60 H8300_GEN_BITOP(clear_bit,  "bclr")
  61 H8300_GEN_BITOP(change_bit, "bnot")
  62 #define __set_bit(nr, addr)    set_bit((nr), (addr))
  63 #define __clear_bit(nr, addr)  clear_bit((nr), (addr))
  64 #define __change_bit(nr, addr) change_bit((nr), (addr))
  65
  66 #undef H8300_GEN_BITOP
  67
  68 static inline int test_bit(int nr, const unsigned long *addr)
  69 {
  70         int ret = 0;
  71         unsigned char *b_addr;
  72         unsigned char bit = nr & 7;
  73
  74         b_addr = (unsigned char *)addr + ((nr >> 3) ^ 3);
  75         if (__builtin_constant_p(nr)) {
  76                 __asm__("bld %Z2,%1\n\t"
  77                         "rotxl %0\n\t"
  78                         : "=r"(ret)
  79                         : "WU"(*b_addr), "i"(nr & 7), "0"(ret) : "cc");
  80         } else {
  81                 __asm__("btst %w2,%1\n\t"
  82                         "beq 1f\n\t"
  83                         "inc.l #1,%0\n"
  84                         "1:"
  85                         : "=r"(ret)
  86                         : "WU"(*b_addr), "r"(bit), "0"(ret) : "cc");
  87         }
  88         return ret;
  89 }
  90
  91 #define __test_bit(nr, addr) test_bit(nr, addr)
  92
  93 #define H8300_GEN_TEST_BITOP(FNNAME, OP)                                \
  94 static inline int FNNAME(int nr, void *addr)                            \
  95 {                                                                       \
  96         int retval = 0;                                                 \
  97         char ccrsave;                                                   \
  98         unsigned char *b_addr;                                          \
  99         unsigned char bit = nr & 7;                                     \
 100                                                                         \
 101         b_addr = (unsigned char *)addr + ((nr >> 3) ^ 3);               \
 102         if (__builtin_constant_p(nr)) {                                 \
 103                 __asm__("stc ccr,%s2\n\t"                               \
 104                         "orc #0x80,ccr\n\t"                             \
 105                         "bld %4,%1\n\t"                                 \
 106                         OP " %4,%1\n\t"                                 \
 107                         "rotxl.l %0\n\t"                                \
 108                         "ldc %s2,ccr"                                   \
 109                         : "=r"(retval), "+WU" (*b_addr), "=&r"(ccrsave) \
 110                         : "0"(retval), "i"(nr & 7) : "cc");             \
 111         } else {                                                        \
 112                 __asm__("stc ccr,%t3\n\t"                               \
 113                         "orc #0x80,ccr\n\t"                             \
 114                         "btst %s3,%1\n\t"                               \
 115                         OP " %s3,%1\n\t"                                \
 116                         "beq 1f\n\t"                                    \
 117                         "inc.l #1,%0\n\t"                               \
 118                         "1:\n"                                          \
 119                         "ldc %t3,ccr"                                   \
 120                         : "=r"(retval), "+WU" (*b_addr)                 \
 121                         : "0" (retval), "r"(bit) : "cc");               \
 122         }                                                               \
 123         return retval;                                                  \
 124 }                                                                       \
 125                                                                         \
 126 static inline int __ ## FNNAME(int nr, void *addr)                      \
 127 {                                                                       \
 128         int retval = 0;                                                 \
 129         unsigned char *b_addr;                                          \
 130         unsigned char bit = nr & 7;                                     \
 131                                                                         \
 132         b_addr = (unsigned char *)addr + ((nr >> 3) ^ 3);               \
 133         if (__builtin_constant_p(nr)) {                                 \
 134                 __asm__("bld %3,%1\n\t"                                 \
 135                         OP " %3,%1\n\t"                                 \
 136                         "rotxl.l %0\n\t"                                \
 137                         : "=r"(retval), "+WU"(*b_addr)                  \
 138                         : "0" (retval), "i"(nr & 7));                   \
 139         } else {                                                        \
 140                 __asm__("btst %s3,%1\n\t"                               \
 141                         OP " %s3,%1\n\t"                                \
 142                         "beq 1f\n\t"                                    \
 143                         "inc.l #1,%0\n\t"                               \
 144                         "1:"                                            \
 145                         : "=r"(retval), "+WU"(*b_addr)                  \
 146                         : "0" (retval), "r"(bit));                      \
 147         }                                                               \
 148         return retval;                                                  \
 149 }
 150
 151 H8300_GEN_TEST_BITOP(test_and_set_bit,    "bset")
 152 H8300_GEN_TEST_BITOP(test_and_clear_bit,  "bclr")
 153 H8300_GEN_TEST_BITOP(test_and_change_bit, "bnot")
 154 #undef H8300_GEN_TEST_BITOP
 155
 156 #include <asm-generic/bitops/ffs.h>
 157
 158 static inline unsigned long __ffs(unsigned long word)
 159 {
 160         unsigned long result;
 161
 162         result = -1;
 163         __asm__("1:\n\t"
 164                 "shlr.l %2\n\t"
 165                 "adds #1,%0\n\t"
 166                 "bcc 1b"
 167                 : "=r" (result)
 168                 : "0"(result), "r"(word));
 169         return result;
 170 }
 171
 172 #include <asm-generic/bitops/find.h>
 173 #include <asm-generic/bitops/sched.h>
 174 #include <asm-generic/bitops/hweight.h>
 175 #include <asm-generic/bitops/lock.h>
 176 #include <asm-generic/bitops/le.h>
 177 #include <asm-generic/bitops/ext2-atomic.h>
 178
 179 #endif /* __KERNEL__ */
 180
 181 #include <asm-generic/bitops/fls.h>
 182 #include <asm-generic/bitops/__fls.h>
 183 #include <asm-generic/bitops/fls64.h>
 184
 185 #endif /* _H8300_BITOPS_H */