diff options
Diffstat (limited to 'include/asm-s390/checksum.h')
| -rw-r--r-- | include/asm-s390/checksum.h | 176 |
1 files changed, 55 insertions, 121 deletions
diff --git a/include/asm-s390/checksum.h b/include/asm-s390/checksum.h index 471f2af..37c362d 100644 --- a/include/asm-s390/checksum.h +++ b/include/asm-s390/checksum.h @@ -30,57 +30,13 @@ static inline unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum) { - /* - * Experiments with ethernet and slip connections show that buf - * is aligned on either a 2-byte or 4-byte boundary. - */ -#ifndef __s390x__ - register_pair rp; - - rp.subreg.even = (unsigned long) buff; - rp.subreg.odd = (unsigned long) len; - __asm__ __volatile__ ( - "0: cksm %0,%1\n" /* do checksum on longs */ - " jo 0b\n" - : "+&d" (sum), "+&a" (rp) : : "cc", "memory" ); -#else /* __s390x__ */ - __asm__ __volatile__ ( - " lgr 2,%1\n" /* address in gpr 2 */ - " lgfr 3,%2\n" /* length in gpr 3 */ - "0: cksm %0,2\n" /* do checksum on longs */ - " jo 0b\n" - : "+&d" (sum) - : "d" (buff), "d" (len) - : "cc", "memory", "2", "3" ); -#endif /* __s390x__ */ - return sum; -} - -/* - * csum_partial as an inline function - */ -static inline unsigned int -csum_partial_inline(const unsigned char * buff, int len, unsigned int sum) -{ -#ifndef __s390x__ - register_pair rp; + register unsigned long reg2 asm("2") = (unsigned long) buff; + register unsigned long reg3 asm("3") = (unsigned long) len; - rp.subreg.even = (unsigned long) buff; - rp.subreg.odd = (unsigned long) len; - __asm__ __volatile__ ( - "0: cksm %0,%1\n" /* do checksum on longs */ - " jo 0b\n" - : "+&d" (sum), "+&a" (rp) : : "cc", "memory" ); -#else /* __s390x__ */ - __asm__ __volatile__ ( - " lgr 2,%1\n" /* address in gpr 2 */ - " lgfr 3,%2\n" /* length in gpr 3 */ - "0: cksm %0,2\n" /* do checksum on longs */ - " jo 0b\n" - : "+&d" (sum) - : "d" (buff), "d" (len) - : "cc", "memory", "2", "3" ); -#endif /* __s390x__ */ + asm volatile( + "0: cksm %0,%1\n" /* do checksum on longs */ + " jo 0b\n" + : "+d" (sum), "+d" (reg2), "+d" (reg3) : : "cc", "memory"); return sum; } @@ -114,7 +70,7 @@ static inline unsigned int csum_partial_copy_nocheck (const char *src, char *dst, int len, unsigned int sum) { memcpy(dst,src,len); - return csum_partial_inline(dst, len, sum); + return csum_partial(dst, len, sum); } /* @@ -126,22 +82,22 @@ csum_fold(unsigned int sum) #ifndef __s390x__ register_pair rp; - __asm__ __volatile__ ( - " slr %N1,%N1\n" /* %0 = H L */ - " lr %1,%0\n" /* %0 = H L, %1 = H L 0 0 */ - " srdl %1,16\n" /* %0 = H L, %1 = 0 H L 0 */ - " alr %1,%N1\n" /* %0 = H L, %1 = L H L 0 */ - " alr %0,%1\n" /* %0 = H+L+C L+H */ - " srl %0,16\n" /* %0 = H+L+C */ - : "+&d" (sum), "=d" (rp) : : "cc" ); + asm volatile( + " slr %N1,%N1\n" /* %0 = H L */ + " lr %1,%0\n" /* %0 = H L, %1 = H L 0 0 */ + " srdl %1,16\n" /* %0 = H L, %1 = 0 H L 0 */ + " alr %1,%N1\n" /* %0 = H L, %1 = L H L 0 */ + " alr %0,%1\n" /* %0 = H+L+C L+H */ + " srl %0,16\n" /* %0 = H+L+C */ + : "+&d" (sum), "=d" (rp) : : "cc"); #else /* __s390x__ */ - __asm__ __volatile__ ( - " sr 3,3\n" /* %0 = H*65536 + L */ - " lr 2,%0\n" /* %0 = H L, R2/R3 = H L / 0 0 */ - " srdl 2,16\n" /* %0 = H L, R2/R3 = 0 H / L 0 */ - " alr 2,3\n" /* %0 = H L, R2/R3 = L H / L 0 */ - " alr %0,2\n" /* %0 = H+L+C L+H */ - " srl %0,16\n" /* %0 = H+L+C */ + asm volatile( + " sr 3,3\n" /* %0 = H*65536 + L */ + " lr 2,%0\n" /* %0 = H L, 2/3 = H L / 0 0 */ + " srdl 2,16\n" /* %0 = H L, 2/3 = 0 H / L 0 */ + " alr 2,3\n" /* %0 = H L, 2/3 = L H / L 0 */ + " alr %0,2\n" /* %0 = H+L+C L+H */ + " srl %0,16\n" /* %0 = H+L+C */ : "+&d" (sum) : : "cc", "2", "3"); #endif /* __s390x__ */ return ((unsigned short) ~sum); @@ -155,29 +111,7 @@ csum_fold(unsigned int sum) static inline unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl) { - unsigned long sum; -#ifndef __s390x__ - register_pair rp; - - rp.subreg.even = (unsigned long) iph; - rp.subreg.odd = (unsigned long) ihl*4; - __asm__ __volatile__ ( - " sr %0,%0\n" /* set sum to zero */ - "0: cksm %0,%1\n" /* do checksum on longs */ - " jo 0b\n" - : "=&d" (sum), "+&a" (rp) : : "cc", "memory" ); -#else /* __s390x__ */ - __asm__ __volatile__ ( - " slgr %0,%0\n" /* set sum to zero */ - " lgr 2,%1\n" /* address in gpr 2 */ - " lgfr 3,%2\n" /* length in gpr 3 */ - "0: cksm %0,2\n" /* do checksum on ints */ - " jo 0b\n" - : "=&d" (sum) - : "d" (iph), "d" (ihl*4) - : "cc", "memory", "2", "3" ); -#endif /* __s390x__ */ - return csum_fold(sum); + return csum_fold(csum_partial(iph, ihl*4, 0)); } /* @@ -190,47 +124,47 @@ csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned int sum) { #ifndef __s390x__ - __asm__ __volatile__ ( - " alr %0,%1\n" /* sum += saddr */ - " brc 12,0f\n" - " ahi %0,1\n" /* add carry */ + asm volatile( + " alr %0,%1\n" /* sum += saddr */ + " brc 12,0f\n" + " ahi %0,1\n" /* add carry */ "0:" - : "+&d" (sum) : "d" (saddr) : "cc" ); - __asm__ __volatile__ ( - " alr %0,%1\n" /* sum += daddr */ - " brc 12,1f\n" - " ahi %0,1\n" /* add carry */ + : "+&d" (sum) : "d" (saddr) : "cc"); + asm volatile( + " alr %0,%1\n" /* sum += daddr */ + " brc 12,1f\n" + " ahi %0,1\n" /* add carry */ "1:" - : "+&d" (sum) : "d" (daddr) : "cc" ); - __asm__ __volatile__ ( - " alr %0,%1\n" /* sum += (len<<16) + (proto<<8) */ - " brc 12,2f\n" - " ahi %0,1\n" /* add carry */ + : "+&d" (sum) : "d" (daddr) : "cc"); + asm volatile( + " alr %0,%1\n" /* sum += (len<<16) + (proto<<8) */ + " brc 12,2f\n" + " ahi %0,1\n" /* add carry */ "2:" : "+&d" (sum) : "d" (((unsigned int) len<<16) + (unsigned int) proto) - : "cc" ); + : "cc"); #else /* __s390x__ */ - __asm__ __volatile__ ( - " lgfr %0,%0\n" - " algr %0,%1\n" /* sum += saddr */ - " brc 12,0f\n" - " aghi %0,1\n" /* add carry */ - "0: algr %0,%2\n" /* sum += daddr */ - " brc 12,1f\n" - " aghi %0,1\n" /* add carry */ - "1: algfr %0,%3\n" /* sum += (len<<16) + proto */ - " brc 12,2f\n" - " aghi %0,1\n" /* add carry */ - "2: srlg 0,%0,32\n" - " alr %0,0\n" /* fold to 32 bits */ - " brc 12,3f\n" - " ahi %0,1\n" /* add carry */ - "3: llgfr %0,%0" + asm volatile( + " lgfr %0,%0\n" + " algr %0,%1\n" /* sum += saddr */ + " brc 12,0f\n" + " aghi %0,1\n" /* add carry */ + "0: algr %0,%2\n" /* sum += daddr */ + " brc 12,1f\n" + " aghi %0,1\n" /* add carry */ + "1: algfr %0,%3\n" /* sum += (len<<16) + proto */ + " brc 12,2f\n" + " aghi %0,1\n" /* add carry */ + "2: srlg 0,%0,32\n" + " alr %0,0\n" /* fold to 32 bits */ + " brc 12,3f\n" + " ahi %0,1\n" /* add carry */ + "3: llgfr %0,%0" : "+&d" (sum) : "d" (saddr), "d" (daddr), "d" (((unsigned int) len<<16) + (unsigned int) proto) - : "cc", "0" ); + : "cc", "0"); #endif /* __s390x__ */ return sum; } |
