diff options
Diffstat (limited to 'include/asm-m68k')
| -rw-r--r-- | include/asm-m68k/string.h | 403 |
1 files changed, 7 insertions, 396 deletions
diff --git a/include/asm-m68k/string.h b/include/asm-m68k/string.h index 44def078132..6c59215b285 100644 --- a/include/asm-m68k/string.h +++ b/include/asm-m68k/string.h @@ -80,43 +80,6 @@ static inline char * strchr(const char * s, int c) return( (char *) s); } -#if 0 -#define __HAVE_ARCH_STRPBRK -static inline char *strpbrk(const char *cs,const char *ct) -{ - const char *sc1,*sc2; - - for( sc1 = cs; *sc1 != '\0'; ++sc1) - for( sc2 = ct; *sc2 != '\0'; ++sc2) - if (*sc1 == *sc2) - return((char *) sc1); - return( NULL ); -} -#endif - -#if 0 -#define __HAVE_ARCH_STRSPN -static inline size_t strspn(const char *s, const char *accept) -{ - const char *p; - const char *a; - size_t count = 0; - - for (p = s; *p != '\0'; ++p) - { - for (a = accept; *a != '\0'; ++a) - if (*p == *a) - break; - if (*a == '\0') - return count; - else - ++count; - } - - return count; -} -#endif - /* strstr !! */ #define __HAVE_ARCH_STRLEN @@ -173,370 +136,18 @@ static inline int strncmp(const char * cs,const char * ct,size_t count) } #define __HAVE_ARCH_MEMSET -/* - * This is really ugly, but its highly optimizatiable by the - * compiler and is meant as compensation for gcc's missing - * __builtin_memset(). For the 680[23]0 it might be worth considering - * the optimal number of misaligned writes compared to the number of - * tests'n'branches needed to align the destination address. The - * 680[46]0 doesn't really care due to their copy-back caches. - * 10/09/96 - Jes Sorensen - */ -static inline void * __memset_g(void * s, int c, size_t count) -{ - void *xs = s; - size_t temp; - - if (!count) - return xs; - - c &= 0xff; - c |= c << 8; - c |= c << 16; - - if (count < 36){ - long *ls = s; - - switch(count){ - case 32: case 33: case 34: case 35: - *ls++ = c; - case 28: case 29: case 30: case 31: - *ls++ = c; - case 24: case 25: case 26: case 27: - *ls++ = c; - case 20: case 21: case 22: case 23: - *ls++ = c; - case 16: case 17: case 18: case 19: - *ls++ = c; - case 12: case 13: case 14: case 15: - *ls++ = c; - case 8: case 9: case 10: case 11: - *ls++ = c; - case 4: case 5: case 6: case 7: - *ls++ = c; - break; - default: - break; - } - s = ls; - if (count & 0x02){ - short *ss = s; - *ss++ = c; - s = ss; - } - if (count & 0x01){ - char *cs = s; - *cs++ = c; - s = cs; - } - return xs; - } - - if ((long) s & 1) - { - char *cs = s; - *cs++ = c; - s = cs; - count--; - } - if (count > 2 && (long) s & 2) - { - short *ss = s; - *ss++ = c; - s = ss; - count -= 2; - } - temp = count >> 2; - if (temp) - { - long *ls = s; - temp--; - do - *ls++ = c; - while (temp--); - s = ls; - } - if (count & 2) - { - short *ss = s; - *ss++ = c; - s = ss; - } - if (count & 1) - { - char *cs = s; - *cs = c; - } - return xs; -} - -/* - * __memset_page assumes that data is longword aligned. Most, if not - * all, of these page sized memsets are performed on page aligned - * areas, thus we do not need to check if the destination is longword - * aligned. Of course we suffer a serious performance loss if this is - * not the case but I think the risk of this ever happening is - * extremely small. We spend a lot of time clearing pages in - * get_empty_page() so I think it is worth it anyway. Besides, the - * 680[46]0 do not really care about misaligned writes due to their - * copy-back cache. - * - * The optimized case for the 680[46]0 is implemented using the move16 - * instruction. My tests showed that this implementation is 35-45% - * faster than the original implementation using movel, the only - * caveat is that the destination address must be 16-byte aligned. - * 01/09/96 - Jes Sorensen - */ -static inline void * __memset_page(void * s,int c,size_t count) -{ - unsigned long data, tmp; - void *xs = s; - - c = c & 255; - data = c | (c << 8); - data |= data << 16; - -#ifdef CPU_M68040_OR_M68060_ONLY - - if (((unsigned long) s) & 0x0f) - __memset_g(s, c, count); - else{ - unsigned long *sp = s; - *sp++ = data; - *sp++ = data; - *sp++ = data; - *sp++ = data; - - __asm__ __volatile__("1:\t" - ".chip 68040\n\t" - "move16 %2@+,%0@+\n\t" - ".chip 68k\n\t" - "subqw #8,%2\n\t" - "subqw #8,%2\n\t" - "dbra %1,1b\n\t" - : "=a" (sp), "=d" (tmp) - : "a" (s), "0" (sp), "1" ((count - 16) / 16 - 1) - ); - } - -#else - __asm__ __volatile__("1:\t" - "movel %2,%0@+\n\t" - "movel %2,%0@+\n\t" - "movel %2,%0@+\n\t" - "movel %2,%0@+\n\t" - "movel %2,%0@+\n\t" - "movel %2,%0@+\n\t" - "movel %2,%0@+\n\t" - "movel %2,%0@+\n\t" - "dbra %1,1b\n\t" - : "=a" (s), "=d" (tmp) - : "d" (data), "0" (s), "1" (count / 32 - 1) - ); -#endif - - return xs; -} - -extern void *memset(void *,int,__kernel_size_t); - -#define __memset_const(s,c,count) \ -((count==PAGE_SIZE) ? \ - __memset_page((s),(c),(count)) : \ - __memset_g((s),(c),(count))) - -#define memset(s, c, count) \ -(__builtin_constant_p(count) ? \ - __memset_const((s),(c),(count)) : \ - __memset_g((s),(c),(count))) +extern void *memset(void *, int, __kernel_size_t); +#define memset(d, c, n) __builtin_memset(d, c, n) #define __HAVE_ARCH_MEMCPY -extern void * memcpy(void *, const void *, size_t ); -/* - * __builtin_memcpy() does not handle page-sized memcpys very well, - * thus following the same assumptions as for page-sized memsets, this - * function copies page-sized areas using an unrolled loop, without - * considering alignment. - * - * For the 680[46]0 only kernels we use the move16 instruction instead - * as it writes through the data-cache, invalidating the cache-lines - * touched. In this way we do not use up the entire data-cache (well, - * half of it on the 68060) by copying a page. An unrolled loop of two - * move16 instructions seem to the fastest. The only caveat is that - * both source and destination must be 16-byte aligned, if not we fall - * back to the generic memcpy function. - Jes - */ -static inline void * __memcpy_page(void * to, const void * from, size_t count) -{ - unsigned long tmp; - void *xto = to; - -#ifdef CPU_M68040_OR_M68060_ONLY - - if (((unsigned long) to | (unsigned long) from) & 0x0f) - return memcpy(to, from, count); - - __asm__ __volatile__("1:\t" - ".chip 68040\n\t" - "move16 %1@+,%0@+\n\t" - "move16 %1@+,%0@+\n\t" - ".chip 68k\n\t" - "dbra %2,1b\n\t" - : "=a" (to), "=a" (from), "=d" (tmp) - : "0" (to), "1" (from) , "2" (count / 32 - 1) - ); -#else - __asm__ __volatile__("1:\t" - "movel %1@+,%0@+\n\t" - "movel %1@+,%0@+\n\t" - "movel %1@+,%0@+\n\t" - "movel %1@+,%0@+\n\t" - "movel %1@+,%0@+\n\t" - "movel %1@+,%0@+\n\t" - "movel %1@+,%0@+\n\t" - "movel %1@+,%0@+\n\t" - "dbra %2,1b\n\t" - : "=a" (to), "=a" (from), "=d" (tmp) - : "0" (to), "1" (from) , "2" (count / 32 - 1) - ); -#endif - return xto; -} - -#define __memcpy_const(to, from, n) \ -((n==PAGE_SIZE) ? \ - __memcpy_page((to),(from),(n)) : \ - __builtin_memcpy((to),(from),(n))) - -#define memcpy(to, from, n) \ -(__builtin_constant_p(n) ? \ - __memcpy_const((to),(from),(n)) : \ - memcpy((to),(from),(n))) +extern void *memcpy(void *, const void *, __kernel_size_t); +#define memcpy(d, s, n) __builtin_memcpy(d, s, n) #define __HAVE_ARCH_MEMMOVE -static inline void * memmove(void * dest,const void * src, size_t n) -{ - void *xdest = dest; - size_t temp; - - if (!n) - return xdest; - - if (dest < src) - { - if ((long) dest & 1) - { - char *cdest = dest; - const char *csrc = src; - *cdest++ = *csrc++; - dest = cdest; - src = csrc; - n--; - } - if (n > 2 && (long) dest & 2) - { - short *sdest = dest; - const short *ssrc = src; - *sdest++ = *ssrc++; - dest = sdest; - src = ssrc; - n -= 2; - } - temp = n >> 2; - if (temp) - { - long *ldest = dest; - const long *lsrc = src; - temp--; - do - *ldest++ = *lsrc++; - while (temp--); - dest = ldest; - src = lsrc; - } - if (n & 2) - { - short *sdest = dest; - const short *ssrc = src; - *sdest++ = *ssrc++; - dest = sdest; - src = ssrc; - } - if (n & 1) - { - char *cdest = dest; - const char *csrc = src; - *cdest = *csrc; - } - } - else - { - dest = (char *) dest + n; - src = (const char *) src + n; - if ((long) dest & 1) - { - char *cdest = dest; - const char *csrc = src; - *--cdest = *--csrc; - dest = cdest; - src = csrc; - n--; - } - if (n > 2 && (long) dest & 2) - { - short *sdest = dest; - const short *ssrc = src; - *--sdest = *--ssrc; - dest = sdest; - src = ssrc; - n -= 2; - } - temp = n >> 2; - if (temp) - { - long *ldest = dest; - const long *lsrc = src; - temp--; - do - *--ldest = *--lsrc; - while (temp--); - dest = ldest; - src = lsrc; - } - if (n & 2) - { - short *sdest = dest; - const short *ssrc = src; - *--sdest = *--ssrc; - dest = sdest; - src = ssrc; - } - if (n & 1) - { - char *cdest = dest; - const char *csrc = src; - *--cdest = *--csrc; - } - } - return xdest; -} +extern void *memmove(void *, const void *, __kernel_size_t); #define __HAVE_ARCH_MEMCMP -extern int memcmp(const void * ,const void * ,size_t ); -#define memcmp(cs, ct, n) \ -(__builtin_constant_p(n) ? \ - __builtin_memcmp((cs),(ct),(n)) : \ - memcmp((cs),(ct),(n))) - -#define __HAVE_ARCH_MEMCHR -static inline void *memchr(const void *cs, int c, size_t count) -{ - /* Someone else can optimize this, I don't care - tonym@mac.linux-m68k.org */ - unsigned char *ret = (unsigned char *)cs; - for(;count>0;count--,ret++) - if(*ret == c) return ret; - - return NULL; -} +extern int memcmp(const void *, const void *, __kernel_size_t); +#define memcmp(d, s, n) __builtin_memcmp(d, s, n) #endif /* _M68K_STRING_H_ */ |