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string_32.h

/*
 * string.h: External definitions for optimized assembly string
 *           routines for the Linux Kernel.
 *
 * Copyright (C) 1995,1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#ifndef __SPARC_STRING_H__
#define __SPARC_STRING_H__

#include <asm/page.h>

/* Really, userland/ksyms should not see any of this stuff. */

#ifdef __KERNEL__

extern void __memmove(void *,const void *,__kernel_size_t);
extern __kernel_size_t __memcpy(void *,const void *,__kernel_size_t);
extern __kernel_size_t __memset(void *,int,__kernel_size_t);

#ifndef EXPORT_SYMTAB_STROPS

/* First the mem*() things. */
#define __HAVE_ARCH_MEMMOVE
#undef memmove
#define memmove(_to, _from, _n) \
({ \
      void *_t = (_to); \
      __memmove(_t, (_from), (_n)); \
      _t; \
})

#define __HAVE_ARCH_MEMCPY

static inline void *__constant_memcpy(void *to, const void *from, __kernel_size_t n)
{
      extern void __copy_1page(void *, const void *);

      if(n <= 32) {
            __builtin_memcpy(to, from, n);
      } else if (((unsigned int) to & 7) != 0) {
            /* Destination is not aligned on the double-word boundary */
            __memcpy(to, from, n);
      } else {
            switch(n) {
            case PAGE_SIZE:
                  __copy_1page(to, from);
                  break;
            default:
                  __memcpy(to, from, n);
                  break;
            }
      }
      return to;
}

static inline void *__nonconstant_memcpy(void *to, const void *from, __kernel_size_t n)
{
      __memcpy(to, from, n);
      return to;
}

#undef memcpy
#define memcpy(t, f, n) \
(__builtin_constant_p(n) ? \
 __constant_memcpy((t),(f),(n)) : \
 __nonconstant_memcpy((t),(f),(n)))

#define __HAVE_ARCH_MEMSET

static inline void *__constant_c_and_count_memset(void *s, char c, __kernel_size_t count)
{
      extern void bzero_1page(void *);
      extern __kernel_size_t __bzero(void *, __kernel_size_t);

      if(!c) {
            if(count == PAGE_SIZE)
                  bzero_1page(s);
            else
                  __bzero(s, count);
      } else {
            __memset(s, c, count);
      }
      return s;
}

static inline void *__constant_c_memset(void *s, char c, __kernel_size_t count)
{
      extern __kernel_size_t __bzero(void *, __kernel_size_t);

      if(!c)
            __bzero(s, count);
      else
            __memset(s, c, count);
      return s;
}

static inline void *__nonconstant_memset(void *s, char c, __kernel_size_t count)
{
      __memset(s, c, count);
      return s;
}

#undef memset
#define memset(s, c, count) \
(__builtin_constant_p(c) ? (__builtin_constant_p(count) ? \
                            __constant_c_and_count_memset((s), (c), (count)) : \
                            __constant_c_memset((s), (c), (count))) \
                          : __nonconstant_memset((s), (c), (count)))

#define __HAVE_ARCH_MEMSCAN

#undef memscan
#define memscan(__arg0, __char, __arg2)                                 \
({                                                          \
      extern void *__memscan_zero(void *, size_t);                      \
      extern void *__memscan_generic(void *, int, size_t);              \
      void *__retval, *__addr = (__arg0);                         \
      size_t __size = (__arg2);                                   \
                                                            \
      if(__builtin_constant_p(__char) && !(__char))                     \
            __retval = __memscan_zero(__addr, __size);                  \
      else                                                  \
            __retval = __memscan_generic(__addr, (__char), __size);           \
                                                            \
      __retval;                                             \
})

#define __HAVE_ARCH_MEMCMP
extern int memcmp(const void *,const void *,__kernel_size_t);

/* Now the str*() stuff... */
#define __HAVE_ARCH_STRLEN
extern __kernel_size_t strlen(const char *);

#define __HAVE_ARCH_STRNCMP

extern int __strncmp(const char *, const char *, __kernel_size_t);

static inline int __constant_strncmp(const char *src, const char *dest, __kernel_size_t count)
{
      register int retval;
      switch(count) {
      case 0: return 0;
      case 1: return (src[0] - dest[0]);
      case 2: retval = (src[0] - dest[0]);
            if(!retval && src[0])
              retval = (src[1] - dest[1]);
            return retval;
      case 3: retval = (src[0] - dest[0]);
            if(!retval && src[0]) {
              retval = (src[1] - dest[1]);
              if(!retval && src[1])
                retval = (src[2] - dest[2]);
            }
            return retval;
      case 4: retval = (src[0] - dest[0]);
            if(!retval && src[0]) {
              retval = (src[1] - dest[1]);
              if(!retval && src[1]) {
                retval = (src[2] - dest[2]);
                if (!retval && src[2])
                  retval = (src[3] - dest[3]);
              }
            }
            return retval;
      case 5: retval = (src[0] - dest[0]);
            if(!retval && src[0]) {
              retval = (src[1] - dest[1]);
              if(!retval && src[1]) {
                retval = (src[2] - dest[2]);
                if (!retval && src[2]) {
                  retval = (src[3] - dest[3]);
                  if (!retval && src[3])
                    retval = (src[4] - dest[4]);
                }
              }
            }
            return retval;
      default:
            retval = (src[0] - dest[0]);
            if(!retval && src[0]) {
              retval = (src[1] - dest[1]);
              if(!retval && src[1]) {
                retval = (src[2] - dest[2]);
                if(!retval && src[2])
                  retval = __strncmp(src+3,dest+3,count-3);
              }
            }
            return retval;
      }
}

#undef strncmp
#define strncmp(__arg0, __arg1, __arg2)   \
(__builtin_constant_p(__arg2) ?     \
 __constant_strncmp(__arg0, __arg1, __arg2) : \
 __strncmp(__arg0, __arg1, __arg2))

#endif /* !EXPORT_SYMTAB_STROPS */

#endif /* __KERNEL__ */

#endif /* !(__SPARC_STRING_H__) */

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