/* $Id: string.h,v 1.36 2001/12/21 00:54:31 davem Exp $
* 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__) */
