arch/h8300/include/asm/bitops.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _H8300_BITOPS_H
   3 #define _H8300_BITOPS_H
   4
   5 /*
   6  * Copyright 1992, Linus Torvalds.
   7  * Copyright 2002, Yoshinori Sato
   8  */
   9
  10 #include <linux/compiler.h>
  11
  12 #ifdef __KERNEL__
  13
  14 #ifndef _LINUX_BITOPS_H
  15 #error only <linux/bitops.h> can be included directly
  16 #endif
  17
  18 /*
  19  * Function prototypes to keep gcc -Wall happy
  20  */
  21
  22 /*
  23  * ffz = Find First Zero in word. Undefined if no zero exists,
  24  * so code should check against ~0UL first..
  25  */
  26 static inline unsigned long ffz(unsigned long word)
  27 {
  28         unsigned long result;
  29
  30         result = -1;
  31         __asm__("1:\n\t"
  32                 "shlr.l %1\n\t"
  33                 "adds #1,%0\n\t"
  34                 "bcs 1b"
  35                 : "=r"(result),"=r"(word)
  36                 : "0"(result), "1"(word));
  37         return result;
  38 }
  39
  40 #define H8300_GEN_BITOP(FNAME, OP)                              \
  41 static inline void FNAME(int nr, volatile unsigned long *addr)  \
  42 {                                                               \
  43         unsigned char *b_addr;                                  \
  44         unsigned char bit = nr & 7;                             \
  45                                                                 \
  46         b_addr = (unsigned char *)addr + ((nr >> 3) ^ 3);       \
  47         if (__builtin_constant_p(nr)) {                         \
  48                 __asm__(OP " %1,%0" : "+WU"(*b_addr) : "i"(nr & 7));    \
  49         } else {                                                \
  50                 __asm__(OP " %s1,%0" : "+WU"(*b_addr) : "r"(bit));      \
  51         }                                                       \
  52 }
  53
  54 /*
  55  * clear_bit() doesn't provide any barrier for the compiler.
  56  */
  57 #define smp_mb__before_clear_bit()      barrier()
  58 #define smp_mb__after_clear_bit()       barrier()
  59
  60 H8300_GEN_BITOP(set_bit,    "bset")
  61 H8300_GEN_BITOP(clear_bit,  "bclr")
  62 H8300_GEN_BITOP(change_bit, "bnot")
  63 #define __set_bit(nr, addr)    set_bit((nr), (addr))
  64 #define __clear_bit(nr, addr)  clear_bit((nr), (addr))
  65 #define __change_bit(nr, addr) change_bit((nr), (addr))
  66
  67 #undef H8300_GEN_BITOP
  68
  69 static inline int test_bit(int nr, const volatile unsigned long *addr)
  70 {
  71         int ret = 0;
  72         unsigned char *b_addr;
  73         unsigned char bit = nr & 7;
  74
  75         b_addr = (unsigned char *)addr + ((nr >> 3) ^ 3);
  76         if (__builtin_constant_p(nr)) {
  77                 __asm__("bld %Z2,%1\n\t"
  78                         "rotxl %0\n\t"
  79                         : "=r"(ret)
  80                         : "WU"(*b_addr), "i"(nr & 7), "0"(ret) : "cc");
  81         } else {
  82                 __asm__("btst %w2,%1\n\t"
  83                         "beq 1f\n\t"
  84                         "inc.l #1,%0\n"
  85                         "1:"
  86                         : "=r"(ret)
  87                         : "WU"(*b_addr), "r"(bit), "0"(ret) : "cc");
  88         }
  89         return ret;
  90 }
  91
  92 #define __test_bit(nr, addr) test_bit(nr, addr)
  93
  94 #define H8300_GEN_TEST_BITOP(FNNAME, OP)                                \
  95 static inline int FNNAME(int nr, void *addr)                            \
  96 {                                                                       \
  97         int retval = 0;                                                 \
  98         char ccrsave;                                                   \
  99         unsigned char *b_addr;                                          \
 100         unsigned char bit = nr & 7;                                     \
 101                                                                         \
 102         b_addr = (unsigned char *)addr + ((nr >> 3) ^ 3);               \
 103         if (__builtin_constant_p(nr)) {                                 \
 104                 __asm__("stc ccr,%s2\n\t"                               \
 105                         "orc #0x80,ccr\n\t"                             \
 106                         "bld %4,%1\n\t"                                 \
 107                         OP " %4,%1\n\t"                                 \
 108                         "rotxl.l %0\n\t"                                \
 109                         "ldc %s2,ccr"                                   \
 110                         : "=r"(retval), "+WU" (*b_addr), "=&r"(ccrsave) \
 111                         : "0"(retval), "i"(nr & 7) : "cc");             \
 112         } else {                                                        \
 113                 __asm__("stc ccr,%t3\n\t"                               \
 114                         "orc #0x80,ccr\n\t"                             \
 115                         "btst %s3,%1\n\t"                               \
 116                         OP " %s3,%1\n\t"                                \
 117                         "beq 1f\n\t"                                    \
 118                         "inc.l #1,%0\n\t"                               \
 119                         "1:\n"                                          \
 120                         "ldc %t3,ccr"                                   \
 121                         : "=r"(retval), "+WU" (*b_addr)                 \
 122                         : "0" (retval), "r"(bit) : "cc");               \
 123         }                                                               \
 124         return retval;                                                  \
 125 }                                                                       \
 126                                                                         \
 127 static inline int __ ## FNNAME(int nr, void *addr)                      \
 128 {                                                                       \
 129         int retval = 0;                                                 \
 130         unsigned char *b_addr;                                          \
 131         unsigned char bit = nr & 7;                                     \
 132                                                                         \
 133         b_addr = (unsigned char *)addr + ((nr >> 3) ^ 3);               \
 134         if (__builtin_constant_p(nr)) {                                 \
 135                 __asm__("bld %3,%1\n\t"                                 \
 136                         OP " %3,%1\n\t"                                 \
 137                         "rotxl.l %0\n\t"                                \
 138                         : "=r"(retval), "+WU"(*b_addr)                  \
 139                         : "0" (retval), "i"(nr & 7));                   \
 140         } else {                                                        \
 141                 __asm__("btst %s3,%1\n\t"                               \
 142                         OP " %s3,%1\n\t"                                \
 143                         "beq 1f\n\t"                                    \
 144                         "inc.l #1,%0\n\t"                               \
 145                         "1:"                                            \
 146                         : "=r"(retval), "+WU"(*b_addr)                  \
 147                         : "0" (retval), "r"(bit));                      \
 148         }                                                               \
 149         return retval;                                                  \
 150 }
 151
 152 H8300_GEN_TEST_BITOP(test_and_set_bit,    "bset")
 153 H8300_GEN_TEST_BITOP(test_and_clear_bit,  "bclr")
 154 H8300_GEN_TEST_BITOP(test_and_change_bit, "bnot")
 155 #undef H8300_GEN_TEST_BITOP
 156
 157 #include <asm-generic/bitops/ffs.h>
 158
 159 static inline unsigned long __ffs(unsigned long word)
 160 {
 161         unsigned long result;
 162
 163         result = -1;
 164         __asm__("1:\n\t"
 165                 "shlr.l %1\n\t"
 166                 "adds #1,%0\n\t"
 167                 "bcc 1b"
 168                 : "=r" (result),"=r"(word)
 169                 : "0"(result), "1"(word));
 170         return result;
 171 }
 172
 173 #include <asm-generic/bitops/find.h>
 174 #include <asm-generic/bitops/sched.h>
 175 #include <asm-generic/bitops/hweight.h>
 176 #include <asm-generic/bitops/lock.h>
 177 #include <asm-generic/bitops/le.h>
 178 #include <asm-generic/bitops/ext2-atomic.h>
 179
 180 #endif /* __KERNEL__ */
 181
 182 #include <asm-generic/bitops/fls.h>
 183 #include <asm-generic/bitops/__fls.h>
 184 #include <asm-generic/bitops/fls64.h>
 185
 186 #endif /* _H8300_BITOPS_H */