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#ifndef _I386_STRING_H_
#define _I386_STRING_H_
#ifdef __KERNEL__
/* Let gcc decide wether to inline or use the out of line functions */
#define __HAVE_ARCH_STRCPY
extern char *strcpy(char *dest, const char *src);
#define __HAVE_ARCH_STRNCPY
extern char *strncpy(char *dest, const char *src, size_t count);
#define __HAVE_ARCH_STRCAT
extern char *strcat(char *dest, const char *src);
#define __HAVE_ARCH_STRNCAT
extern char *strncat(char *dest, const char *src, size_t count);
#define __HAVE_ARCH_STRCMP
extern int strcmp(const char *cs, const char *ct);
#define __HAVE_ARCH_STRNCMP
extern int strncmp(const char *cs, const char *ct, size_t count);
#define __HAVE_ARCH_STRCHR
extern char *strchr(const char *s, int c);
#define __HAVE_ARCH_STRLEN
extern size_t strlen(const char *s);
static __always_inline void * __memcpy(void * to, const void * from, size_t n)
{
int d0, d1, d2;
__asm__ __volatile__(
"rep ; movsl\n\t"
"movl %4,%%ecx\n\t"
"andl $3,%%ecx\n\t"
"jz 1f\n\t"
"rep ; movsb\n\t"
"1:"
: "=&c" (d0), "=&D" (d1), "=&S" (d2)
: "0" (n/4), "g" (n), "1" ((long) to), "2" ((long) from)
: "memory");
return (to);
}
/*
* This looks ugly, but the compiler can optimize it totally,
* as the count is constant.
*/
static __always_inline void * __constant_memcpy(void * to, const void * from, size_t n)
{
long esi, edi;
if (!n) return to;
#if 1 /* want to do small copies with non-string ops? */
switch (n) {
case 1: *(char*)to = *(char*)from; return to;
case 2: *(short*)to = *(short*)from; return to;
case 4: *(int*)to = *(int*)from; return to;
#if 1 /* including those doable with two moves? */
case 3: *(short*)to = *(short*)from;
*((char*)to+2) = *((char*)from+2); return to;
case 5: *(int*)to = *(int*)from;
*((char*)to+4) = *((char*)from+4); return to;
case 6: *(int*)to = *(int*)from;
*((short*)to+2) = *((short*)from+2); return to;
case 8: *(int*)to = *(int*)from;
*((int*)to+1) = *((int*)from+1); return to;
#endif
}
#endif
esi = (long) from;
edi = (long) to;
if (n >= 5*4) {
/* large block: use rep prefix */
int ecx;
__asm__ __volatile__(
"rep ; movsl"
: "=&c" (ecx), "=&D" (edi), "=&S" (esi)
: "0" (n/4), "1" (edi),"2" (esi)
: "memory"
);
} else {
/* small block: don't clobber ecx + smaller code */
if (n >= 4*4) __asm__ __volatile__("movsl"
:"=&D"(edi),"=&S"(esi):"0"(edi),"1"(esi):"memory");
if (n >= 3*4) __asm__ __volatile__("movsl"
:"=&D"(edi),"=&S"(esi):"0"(edi),"1"(esi):"memory");
if (n >= 2*4) __asm__ __volatile__("movsl"
:"=&D"(edi),"=&S"(esi):"0"(edi),"1"(esi):"memory");
if (n >= 1*4) __asm__ __volatile__("movsl"
:"=&D"(edi),"=&S"(esi):"0"(edi),"1"(esi):"memory");
}
switch (n % 4) {
/* tail */
case 0: return to;
case 1: __asm__ __volatile__("movsb"
:"=&D"(edi),"=&S"(esi):"0"(edi),"1"(esi):"memory");
return to;
case 2: __asm__ __volatile__("movsw"
:"=&D"(edi),"=&S"(esi):"0"(edi),"1"(esi):"memory");
return to;
default: __asm__ __volatile__("movsw\n\tmovsb"
:"=&D"(edi),"=&S"(esi):"0"(edi),"1"(esi):"memory");
return to;
}
}
#define __HAVE_ARCH_MEMCPY
#ifdef CONFIG_X86_USE_3DNOW
#include <asm/mmx.h>
/*
* This CPU favours 3DNow strongly (eg AMD Athlon)
*/
static inline void * __constant_memcpy3d(void * to, const void * from, size_t len)
{
if (len < 512)
return __constant_memcpy(to, from, len);
return _mmx_memcpy(to, from, len);
}
static __inline__ void *__memcpy3d(void *to, const void *from, size_t len)
{
if (len < 512)
return __memcpy(to, from, len);
return _mmx_memcpy(to, from, len);
}
#define memcpy(t, f, n) \
(__builtin_constant_p(n) ? \
__constant_memcpy3d((t),(f),(n)) : \
__memcpy3d((t),(f),(n)))
#else
/*
* No 3D Now!
*/
#define memcpy(t, f, n) \
(__builtin_constant_p(n) ? \
__constant_memcpy((t),(f),(n)) : \
__memcpy((t),(f),(n)))
#endif
#define __HAVE_ARCH_MEMMOVE
void *memmove(void * dest,const void * src, size_t n);
#define memcmp __builtin_memcmp
#define __HAVE_ARCH_MEMCHR
extern void *memchr(const void * cs,int c,size_t count);
static inline void * __memset_generic(void * s, char c,size_t count)
{
int d0, d1;
__asm__ __volatile__(
"rep\n\t"
"stosb"
: "=&c" (d0), "=&D" (d1)
:"a" (c),"1" (s),"0" (count)
:"memory");
return s;
}
/* we might want to write optimized versions of these later */
#define __constant_count_memset(s,c,count) __memset_generic((s),(c),(count))
/*
* memset(x,0,y) is a reasonably common thing to do, so we want to fill
* things 32 bits at a time even when we don't know the size of the
* area at compile-time..
*/
static __always_inline void * __constant_c_memset(void * s, unsigned long c, size_t count)
{
int d0, d1;
__asm__ __volatile__(
"rep ; stosl\n\t"
"testb $2,%b3\n\t"
"je 1f\n\t"
"stosw\n"
"1:\ttestb $1,%b3\n\t"
"je 2f\n\t"
"stosb\n"
"2:"
:"=&c" (d0), "=&D" (d1)
:"a" (c), "q" (count), "0" (count/4), "1" ((long) s)
:"memory");
return (s);
}
/* Added by Gertjan van Wingerde to make minix and sysv module work */
#define __HAVE_ARCH_STRNLEN
extern size_t strnlen(const char * s, size_t count);
/* end of additional stuff */
#define __HAVE_ARCH_STRSTR
extern char *strstr(const char *cs, const char *ct);
/*
* This looks horribly ugly, but the compiler can optimize it totally,
* as we by now know that both pattern and count is constant..
*/
static __always_inline void * __constant_c_and_count_memset(void * s, unsigned long pattern, size_t count)
{
switch (count) {
case 0:
return s;
case 1:
*(unsigned char *)s = pattern & 0xff;
return s;
case 2:
*(unsigned short *)s = pattern & 0xffff;
return s;
case 3:
*(unsigned short *)s = pattern & 0xffff;
*(2+(unsigned char *)s) = pattern & 0xff;
return s;
case 4:
*(unsigned long *)s = pattern;
return s;
}
#define COMMON(x) \
__asm__ __volatile__( \
"rep ; stosl" \
x \
: "=&c" (d0), "=&D" (d1) \
: "a" (pattern),"0" (count/4),"1" ((long) s) \
: "memory")
{
int d0, d1;
switch (count % 4) {
case 0: COMMON(""); return s;
case 1: COMMON("\n\tstosb"); return s;
case 2: COMMON("\n\tstosw"); return s;
default: COMMON("\n\tstosw\n\tstosb"); return s;
}
}
#undef COMMON
}
#define __constant_c_x_memset(s, c, count) \
(__builtin_constant_p(count) ? \
__constant_c_and_count_memset((s),(c),(count)) : \
__constant_c_memset((s),(c),(count)))
#define __memset(s, c, count) \
(__builtin_constant_p(count) ? \
__constant_count_memset((s),(c),(count)) : \
__memset_generic((s),(c),(count)))
#define __HAVE_ARCH_MEMSET
#define memset(s, c, count) \
(__builtin_constant_p(c) ? \
__constant_c_x_memset((s),(0x01010101UL*(unsigned char)(c)),(count)) : \
__memset((s),(c),(count)))
/*
* find the first occurrence of byte 'c', or 1 past the area if none
*/
#define __HAVE_ARCH_MEMSCAN
extern void *memscan(void * addr, int c, size_t size);
#endif /* __KERNEL__ */
#endif
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