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 void *__memset(void *,int,__kernel_size_t);
  20 extern void *__builtin_memset(void *,int,__kernel_size_t);
  21
  22 #ifndef EXPORT_SYMTAB_STROPS
  23
  24 /* First the mem*() things. */
  25 #define __HAVE_ARCH_BCOPY
  26 #define __HAVE_ARCH_MEMMOVE
  27
  28 #undef memmove
  29 #define memmove(_to, _from, _n) \
  30 ({ \
  31         void *_t = (_to); \
  32         __memmove(_t, (_from), (_n)); \
  33         _t; \
  34 })
  35
  36 #define __HAVE_ARCH_MEMCPY
  37
  38 extern void * memcpy(void *,const void *,__kernel_size_t);
  39
  40 #define __HAVE_ARCH_MEMSET
  41
  42 static inline void *__constant_memset(void *s, int c, __kernel_size_t count)
  43 {
  44         extern __kernel_size_t __bzero(void *, __kernel_size_t);
  45
  46         if(!c) {
  47                 __bzero(s, count);
  48                 return s;
  49         } else
  50                 return __memset(s, c, count);
  51 }
  52
  53 #undef memset
  54 #define memset(s, c, count) \
  55 ((__builtin_constant_p(count) && (count) <= 32) ? \
  56  __builtin_memset((s), (c), (count)) : \
  57  (__builtin_constant_p(c) ? \
  58   __constant_memset((s), (c), (count)) : \
  59   __memset((s), (c), (count))))
  60
  61 #define __HAVE_ARCH_MEMSCAN
  62
  63 #undef memscan
  64 #define memscan(__arg0, __char, __arg2)                                         \
  65 ({                                                                              \
  66         extern void *__memscan_zero(void *, size_t);                            \
  67         extern void *__memscan_generic(void *, int, size_t);                    \
  68         void *__retval, *__addr = (__arg0);                                     \
  69         size_t __size = (__arg2);                                               \
  70                                                                                 \
  71         if(__builtin_constant_p(__char) && !(__char))                           \
  72                 __retval = __memscan_zero(__addr, __size);                      \
  73         else                                                                    \
  74                 __retval = __memscan_generic(__addr, (__char), __size);         \
  75                                                                                 \
  76         __retval;                                                               \
  77 })
  78
  79 #define __HAVE_ARCH_MEMCMP
  80 extern int memcmp(const void *,const void *,__kernel_size_t);
  81
  82 /* Now the str*() stuff... */
  83 #define __HAVE_ARCH_STRLEN
  84
  85 extern __kernel_size_t __strlen(const char *);
  86 extern __kernel_size_t strlen(const char *);
  87
  88 #define __HAVE_ARCH_STRNCMP
  89
  90 extern int __strncmp(const char *, const char *, __kernel_size_t);
  91
  92 static inline int __constant_strncmp(const char *src, const char *dest, __kernel_size_t count)
  93 {
  94         register int retval;
  95         switch(count) {
  96         case 0: return 0;
  97         case 1: return (src[0] - dest[0]);
  98         case 2: retval = (src[0] - dest[0]);
  99                 if(!retval && src[0])
 100                   retval = (src[1] - dest[1]);
 101                 return retval;
 102         case 3: retval = (src[0] - dest[0]);
 103                 if(!retval && src[0]) {
 104                   retval = (src[1] - dest[1]);
 105                   if(!retval && src[1])
 106                     retval = (src[2] - dest[2]);
 107                 }
 108                 return retval;
 109         case 4: retval = (src[0] - dest[0]);
 110                 if(!retval && src[0]) {
 111                   retval = (src[1] - dest[1]);
 112                   if(!retval && src[1]) {
 113                     retval = (src[2] - dest[2]);
 114                     if (!retval && src[2])
 115                       retval = (src[3] - dest[3]);
 116                   }
 117                 }
 118                 return retval;
 119         case 5: retval = (src[0] - dest[0]);
 120                 if(!retval && src[0]) {
 121                   retval = (src[1] - dest[1]);
 122                   if(!retval && src[1]) {
 123                     retval = (src[2] - dest[2]);
 124                     if (!retval && src[2]) {
 125                       retval = (src[3] - dest[3]);
 126                       if (!retval && src[3])
 127                         retval = (src[4] - dest[4]);
 128                     }
 129                   }
 130                 }
 131                 return retval;
 132         default:
 133                 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 = __strncmp(src+3,dest+3,count-3);
 140                   }
 141                 }
 142                 return retval;
 143         }
 144 }
 145
 146 #undef strncmp
 147 #define strncmp(__arg0, __arg1, __arg2) \
 148 (__builtin_constant_p(__arg2) ? \
 149  __constant_strncmp(__arg0, __arg1, __arg2) : \
 150  __strncmp(__arg0, __arg1, __arg2))
 151
 152 #endif /* !EXPORT_SYMTAB_STROPS */
 153
 154 #endif /* __KERNEL__ */
 155
 156 #endif /* !(__SPARC64_STRING_H__) */