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   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_MEMMOVE
  26 #undef memmove
  27 #define memmove(_to, _from, _n) \
  28 ({ \
  29         void *_t = (_to); \
  30         __memmove(_t, (_from), (_n)); \
  31         _t; \
  32 })
  33
  34 #define __HAVE_ARCH_MEMCPY
  35
  36 static inline void *__constant_memcpy(void *to, const void *from, __kernel_size_t n)
  37 {
  38         extern void __copy_1page(void *, const void *);
  39
  40         if(n <= 32) {
  41                 __builtin_memcpy(to, from, n);
  42         } else if (((unsigned int) to & 7) != 0) {
  43                 /* Destination is not aligned on the double-word boundary */
  44                 __memcpy(to, from, n);
  45         } else {
  46                 switch(n) {
  47                 case PAGE_SIZE:
  48                         __copy_1page(to, from);
  49                         break;
  50                 default:
  51                         __memcpy(to, from, n);
  52                         break;
  53                 }
  54         }
  55         return to;
  56 }
  57
  58 static inline void *__nonconstant_memcpy(void *to, const void *from, __kernel_size_t n)
  59 {
  60         __memcpy(to, from, n);
  61         return to;
  62 }
  63
  64 #undef memcpy
  65 #define memcpy(t, f, n) \
  66 (__builtin_constant_p(n) ? \
  67  __constant_memcpy((t),(f),(n)) : \
  68  __nonconstant_memcpy((t),(f),(n)))
  69
  70 #define __HAVE_ARCH_MEMSET
  71
  72 static inline void *__constant_c_and_count_memset(void *s, char c, __kernel_size_t count)
  73 {
  74         extern void bzero_1page(void *);
  75         extern __kernel_size_t __bzero(void *, __kernel_size_t);
  76
  77         if(!c) {
  78                 if(count == PAGE_SIZE)
  79                         bzero_1page(s);
  80                 else
  81                         __bzero(s, count);
  82         } else {
  83                 __memset(s, c, count);
  84         }
  85         return s;
  86 }
  87
  88 static inline void *__constant_c_memset(void *s, char c, __kernel_size_t count)
  89 {
  90         extern __kernel_size_t __bzero(void *, __kernel_size_t);
  91
  92         if(!c)
  93                 __bzero(s, count);
  94         else
  95                 __memset(s, c, count);
  96         return s;
  97 }
  98
  99 static inline void *__nonconstant_memset(void *s, char c, __kernel_size_t count)
 100 {
 101         __memset(s, c, count);
 102         return s;
 103 }
 104
 105 #undef memset
 106 #define memset(s, c, count) \
 107 (__builtin_constant_p(c) ? (__builtin_constant_p(count) ? \
 108                             __constant_c_and_count_memset((s), (c), (count)) : \
 109                             __constant_c_memset((s), (c), (count))) \
 110                           : __nonconstant_memset((s), (c), (count)))
 111
 112 #define __HAVE_ARCH_MEMSCAN
 113
 114 #undef memscan
 115 #define memscan(__arg0, __char, __arg2)                                         \
 116 ({                                                                              \
 117         extern void *__memscan_zero(void *, size_t);                            \
 118         extern void *__memscan_generic(void *, int, size_t);                    \
 119         void *__retval, *__addr = (__arg0);                                     \
 120         size_t __size = (__arg2);                                               \
 121                                                                                 \
 122         if(__builtin_constant_p(__char) && !(__char))                           \
 123                 __retval = __memscan_zero(__addr, __size);                      \
 124         else                                                                    \
 125                 __retval = __memscan_generic(__addr, (__char), __size);         \
 126                                                                                 \
 127         __retval;                                                               \
 128 })
 129
 130 #define __HAVE_ARCH_MEMCMP
 131 extern int memcmp(const void *,const void *,__kernel_size_t);
 132
 133 /* Now the str*() stuff... */
 134 #define __HAVE_ARCH_STRLEN
 135 extern __kernel_size_t strlen(const char *);
 136
 137 #define __HAVE_ARCH_STRNCMP
 138
 139 extern int __strncmp(const char *, const char *, __kernel_size_t);
 140
 141 static inline int __constant_strncmp(const char *src, const char *dest, __kernel_size_t count)
 142 {
 143         register int retval;
 144         switch(count) {
 145         case 0: return 0;
 146         case 1: return (src[0] - dest[0]);
 147         case 2: retval = (src[0] - dest[0]);
 148                 if(!retval && src[0])
 149                   retval = (src[1] - dest[1]);
 150                 return retval;
 151         case 3: retval = (src[0] - dest[0]);
 152                 if(!retval && src[0]) {
 153                   retval = (src[1] - dest[1]);
 154                   if(!retval && src[1])
 155                     retval = (src[2] - dest[2]);
 156                 }
 157                 return retval;
 158         case 4: retval = (src[0] - dest[0]);
 159                 if(!retval && src[0]) {
 160                   retval = (src[1] - dest[1]);
 161                   if(!retval && src[1]) {
 162                     retval = (src[2] - dest[2]);
 163                     if (!retval && src[2])
 164                       retval = (src[3] - dest[3]);
 165                   }
 166                 }
 167                 return retval;
 168         case 5: retval = (src[0] - dest[0]);
 169                 if(!retval && src[0]) {
 170                   retval = (src[1] - dest[1]);
 171                   if(!retval && src[1]) {
 172                     retval = (src[2] - dest[2]);
 173                     if (!retval && src[2]) {
 174                       retval = (src[3] - dest[3]);
 175                       if (!retval && src[3])
 176                         retval = (src[4] - dest[4]);
 177                     }
 178                   }
 179                 }
 180                 return retval;
 181         default:
 182                 retval = (src[0] - dest[0]);
 183                 if(!retval && src[0]) {
 184                   retval = (src[1] - dest[1]);
 185                   if(!retval && src[1]) {
 186                     retval = (src[2] - dest[2]);
 187                     if(!retval && src[2])
 188                       retval = __strncmp(src+3,dest+3,count-3);
 189                   }
 190                 }
 191                 return retval;
 192         }
 193 }
 194
 195 #undef strncmp
 196 #define strncmp(__arg0, __arg1, __arg2) \
 197 (__builtin_constant_p(__arg2) ? \
 198  __constant_strncmp(__arg0, __arg1, __arg2) : \
 199  __strncmp(__arg0, __arg1, __arg2))
 200
 201 #endif /* !EXPORT_SYMTAB_STROPS */
 202
 203 #endif /* __KERNEL__ */
 204
 205 #endif /* !(__SPARC_STRING_H__) */