include/asm-sparc/string.h

   1 /* $Id: string.h,v 1.36 2001/12/21 00:54:31 davem 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 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #ifndef __SPARC_STRING_H__
  10 #define __SPARC_STRING_H__
  11
  12 #include <asm/page.h>
  13
  14 /* Really, userland/ksyms should not see any of this stuff. */
  15
  16 #ifdef __KERNEL__
  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 __kernel_size_t __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 #undef memmove
  28 #define memmove(_to, _from, _n) \
  29 ({ \
  30         void *_t = (_to); \
  31         __memmove(_t, (_from), (_n)); \
  32         _t; \
  33 })
  34
  35 #define __HAVE_ARCH_MEMCPY
  36
  37 static inline void *__constant_memcpy(void *to, const void *from, __kernel_size_t n)
  38 {
  39         extern void __copy_1page(void *, const void *);
  40
  41         if(n <= 32) {
  42                 __builtin_memcpy(to, from, n);
  43         } else {
  44                 switch(n) {
  45                 case PAGE_SIZE:
  46                         __copy_1page(to, from);
  47                         break;
  48                 default:
  49                         __memcpy(to, from, n);
  50                         break;
  51                 }
  52         }
  53         return to;
  54 }
  55
  56 static inline void *__nonconstant_memcpy(void *to, const void *from, __kernel_size_t n)
  57 {
  58         __memcpy(to, from, n);
  59         return to;
  60 }
  61
  62 #undef memcpy
  63 #define memcpy(t, f, n) \
  64 (__builtin_constant_p(n) ? \
  65  __constant_memcpy((t),(f),(n)) : \
  66  __nonconstant_memcpy((t),(f),(n)))
  67
  68 #define __HAVE_ARCH_MEMSET
  69
  70 static inline void *__constant_c_and_count_memset(void *s, char c, __kernel_size_t count)
  71 {
  72         extern void bzero_1page(void *);
  73         extern __kernel_size_t __bzero(void *, __kernel_size_t);
  74
  75         if(!c) {
  76                 if(count == PAGE_SIZE)
  77                         bzero_1page(s);
  78                 else
  79                         __bzero(s, count);
  80         } else {
  81                 __memset(s, c, count);
  82         }
  83         return s;
  84 }
  85
  86 static inline void *__constant_c_memset(void *s, char c, __kernel_size_t count)
  87 {
  88         extern __kernel_size_t __bzero(void *, __kernel_size_t);
  89
  90         if(!c)
  91                 __bzero(s, count);
  92         else
  93                 __memset(s, c, count);
  94         return s;
  95 }
  96
  97 static inline void *__nonconstant_memset(void *s, char c, __kernel_size_t count)
  98 {
  99         __memset(s, c, count);
 100         return s;
 101 }
 102
 103 #undef memset
 104 #define memset(s, c, count) \
 105 (__builtin_constant_p(c) ? (__builtin_constant_p(count) ? \
 106                             __constant_c_and_count_memset((s), (c), (count)) : \
 107                             __constant_c_memset((s), (c), (count))) \
 108                           : __nonconstant_memset((s), (c), (count)))
 109
 110 #define __HAVE_ARCH_MEMSCAN
 111
 112 #undef memscan
 113 #define memscan(__arg0, __char, __arg2)                                         \
 114 ({                                                                              \
 115         extern void *__memscan_zero(void *, size_t);                            \
 116         extern void *__memscan_generic(void *, int, size_t);                    \
 117         void *__retval, *__addr = (__arg0);                                     \
 118         size_t __size = (__arg2);                                               \
 119                                                                                 \
 120         if(__builtin_constant_p(__char) && !(__char))                           \
 121                 __retval = __memscan_zero(__addr, __size);                      \
 122         else                                                                    \
 123                 __retval = __memscan_generic(__addr, (__char), __size);         \
 124                                                                                 \
 125         __retval;                                                               \
 126 })
 127
 128 #define __HAVE_ARCH_MEMCMP
 129 extern int memcmp(const void *,const void *,__kernel_size_t);
 130
 131 /* Now the str*() stuff... */
 132 #define __HAVE_ARCH_STRLEN
 133 extern __kernel_size_t strlen(const char *);
 134
 135 #define __HAVE_ARCH_STRNCMP
 136
 137 extern int __strncmp(const char *, const char *, __kernel_size_t);
 138
 139 static inline int __constant_strncmp(const char *src, const char *dest, __kernel_size_t count)
 140 {
 141         register int retval;
 142         switch(count) {
 143         case 0: return 0;
 144         case 1: return (src[0] - dest[0]);
 145         case 2: retval = (src[0] - dest[0]);
 146                 if(!retval && src[0])
 147                   retval = (src[1] - dest[1]);
 148                 return retval;
 149         case 3: retval = (src[0] - dest[0]);
 150                 if(!retval && src[0]) {
 151                   retval = (src[1] - dest[1]);
 152                   if(!retval && src[1])
 153                     retval = (src[2] - dest[2]);
 154                 }
 155                 return retval;
 156         case 4: retval = (src[0] - dest[0]);
 157                 if(!retval && src[0]) {
 158                   retval = (src[1] - dest[1]);
 159                   if(!retval && src[1]) {
 160                     retval = (src[2] - dest[2]);
 161                     if (!retval && src[2])
 162                       retval = (src[3] - dest[3]);
 163                   }
 164                 }
 165                 return retval;
 166         case 5: retval = (src[0] - dest[0]);
 167                 if(!retval && src[0]) {
 168                   retval = (src[1] - dest[1]);
 169                   if(!retval && src[1]) {
 170                     retval = (src[2] - dest[2]);
 171                     if (!retval && src[2]) {
 172                       retval = (src[3] - dest[3]);
 173                       if (!retval && src[3])
 174                         retval = (src[4] - dest[4]);
 175                     }
 176                   }
 177                 }
 178                 return retval;
 179         default:
 180                 retval = (src[0] - dest[0]);
 181                 if(!retval && src[0]) {
 182                   retval = (src[1] - dest[1]);
 183                   if(!retval && src[1]) {
 184                     retval = (src[2] - dest[2]);
 185                     if(!retval && src[2])
 186                       retval = __strncmp(src+3,dest+3,count-3);
 187                   }
 188                 }
 189                 return retval;
 190         }
 191 }
 192
 193 #undef strncmp
 194 #define strncmp(__arg0, __arg1, __arg2) \
 195 (__builtin_constant_p(__arg2) ? \
 196  __constant_strncmp(__arg0, __arg1, __arg2) : \
 197  __strncmp(__arg0, __arg1, __arg2))
 198
 199 #endif /* !EXPORT_SYMTAB_STROPS */
 200
 201 #endif /* __KERNEL__ */
 202
 203 #endif /* !(__SPARC_STRING_H__) */