include/asm-sparc64/string.h

   1 /* $Id: string.h,v 1.20 2001/09/27 04:36:24 kanoj Exp $
   2  * string.h: External definitions for optimized assembly string
   3  *           routines for the Linux Kernel.
   4  *
   5  * Copyright (C) 1995,1996 David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 1996,1997,1999 Jakub Jelinek (jakub@redhat.com)
   7  */
   8
   9 #ifndef __SPARC64_STRING_H__
  10 #define __SPARC64_STRING_H__
  11
  12 /* Really, userland/ksyms should not see any of this stuff. */
  13
  14 #ifdef __KERNEL__
  15
  16 #include <asm/asi.h>
  17
  18 extern void __memmove(void *,const void *,__kernel_size_t);
  19 extern __kernel_size_t __memcpy(void *,const void *,__kernel_size_t);
  20 extern void *__memset(void *,int,__kernel_size_t);
  21 extern void *__builtin_memcpy(void *,const void *,__kernel_size_t);
  22 extern void *__builtin_memset(void *,int,__kernel_size_t);
  23
  24 #ifndef EXPORT_SYMTAB_STROPS
  25
  26 /* First the mem*() things. */
  27 #define __HAVE_ARCH_BCOPY
  28 #define __HAVE_ARCH_MEMMOVE
  29
  30 #undef memmove
  31 #define memmove(_to, _from, _n) \
  32 ({ \
  33         void *_t = (_to); \
  34         __memmove(_t, (_from), (_n)); \
  35         _t; \
  36 })
  37
  38 #define __HAVE_ARCH_MEMCPY
  39
  40 static inline void *__constant_memcpy(void *to, const void *from, __kernel_size_t n)
  41 {
  42         if(n) {
  43                 if(n <= 32) {
  44                         __builtin_memcpy(to, from, n);
  45                 } else {
  46                         __memcpy(to, from, n);
  47                 }
  48         }
  49         return to;
  50 }
  51
  52 static inline void *__nonconstant_memcpy(void *to, const void *from, __kernel_size_t n)
  53 {
  54         __memcpy(to, from, n);
  55         return to;
  56 }
  57
  58 #undef memcpy
  59 #define memcpy(t, f, n) \
  60 (__builtin_constant_p(n) ? \
  61  __constant_memcpy((t),(f),(n)) : \
  62  __nonconstant_memcpy((t),(f),(n)))
  63
  64 #define __HAVE_ARCH_MEMSET
  65
  66 static inline void *__constant_memset(void *s, int c, __kernel_size_t count)
  67 {
  68         extern __kernel_size_t __bzero(void *, __kernel_size_t);
  69
  70         if(!c) {
  71                 __bzero(s, count);
  72                 return s;
  73         } else
  74                 return __memset(s, c, count);
  75 }
  76
  77 #undef memset
  78 #define memset(s, c, count) \
  79 ((__builtin_constant_p(count) && (count) <= 32) ? \
  80  __builtin_memset((s), (c), (count)) : \
  81  (__builtin_constant_p(c) ? \
  82   __constant_memset((s), (c), (count)) : \
  83   __memset((s), (c), (count))))
  84
  85 #define __HAVE_ARCH_MEMSCAN
  86
  87 #undef memscan
  88 #define memscan(__arg0, __char, __arg2)                                         \
  89 ({                                                                              \
  90         extern void *__memscan_zero(void *, size_t);                            \
  91         extern void *__memscan_generic(void *, int, size_t);                    \
  92         void *__retval, *__addr = (__arg0);                                     \
  93         size_t __size = (__arg2);                                               \
  94                                                                                 \
  95         if(__builtin_constant_p(__char) && !(__char))                           \
  96                 __retval = __memscan_zero(__addr, __size);                      \
  97         else                                                                    \
  98                 __retval = __memscan_generic(__addr, (__char), __size);         \
  99                                                                                 \
 100         __retval;                                                               \
 101 })
 102
 103 #define __HAVE_ARCH_MEMCMP
 104 extern int memcmp(const void *,const void *,__kernel_size_t);
 105
 106 /* Now the str*() stuff... */
 107 #define __HAVE_ARCH_STRLEN
 108
 109 extern __kernel_size_t __strlen(const char *);
 110 extern __kernel_size_t strlen(const char *);
 111
 112 #define __HAVE_ARCH_STRNCMP
 113
 114 extern int __strncmp(const char *, const char *, __kernel_size_t);
 115
 116 static inline int __constant_strncmp(const char *src, const char *dest, __kernel_size_t count)
 117 {
 118         register int retval;
 119         switch(count) {
 120         case 0: return 0;
 121         case 1: return (src[0] - dest[0]);
 122         case 2: retval = (src[0] - dest[0]);
 123                 if(!retval && src[0])
 124                   retval = (src[1] - dest[1]);
 125                 return retval;
 126         case 3: retval = (src[0] - dest[0]);
 127                 if(!retval && src[0]) {
 128                   retval = (src[1] - dest[1]);
 129                   if(!retval && src[1])
 130                     retval = (src[2] - dest[2]);
 131                 }
 132                 return retval;
 133         case 4: retval = (src[0] - dest[0]);
 134                 if(!retval && src[0]) {
 135                   retval = (src[1] - dest[1]);
 136                   if(!retval && src[1]) {
 137                     retval = (src[2] - dest[2]);
 138                     if (!retval && src[2])
 139                       retval = (src[3] - dest[3]);
 140                   }
 141                 }
 142                 return retval;
 143         case 5: retval = (src[0] - dest[0]);
 144                 if(!retval && src[0]) {
 145                   retval = (src[1] - dest[1]);
 146                   if(!retval && src[1]) {
 147                     retval = (src[2] - dest[2]);
 148                     if (!retval && src[2]) {
 149                       retval = (src[3] - dest[3]);
 150                       if (!retval && src[3])
 151                         retval = (src[4] - dest[4]);
 152                     }
 153                   }
 154                 }
 155                 return retval;
 156         default:
 157                 retval = (src[0] - dest[0]);
 158                 if(!retval && src[0]) {
 159                   retval = (src[1] - dest[1]);
 160                   if(!retval && src[1]) {
 161                     retval = (src[2] - dest[2]);
 162                     if(!retval && src[2])
 163                       retval = __strncmp(src+3,dest+3,count-3);
 164                   }
 165                 }
 166                 return retval;
 167         }
 168 }
 169
 170 #undef strncmp
 171 #define strncmp(__arg0, __arg1, __arg2) \
 172 (__builtin_constant_p(__arg2) ? \
 173  __constant_strncmp(__arg0, __arg1, __arg2) : \
 174  __strncmp(__arg0, __arg1, __arg2))
 175
 176 #endif /* !EXPORT_SYMTAB_STROPS */
 177
 178 #endif /* __KERNEL__ */
 179
 180 #endif /* !(__SPARC64_STRING_H__) */