diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/arch/hppa/hppa/in_cksum.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/sys/arch/hppa/hppa/in_cksum.c b/sys/arch/hppa/hppa/in_cksum.c new file mode 100644 index 00000000000..cfd291cb113 --- /dev/null +++ b/sys/arch/hppa/hppa/in_cksum.c @@ -0,0 +1,128 @@ +/* $OpenBSD: in_cksum.c,v 1.1 2001/01/13 00:00:20 mickey Exp $ */ + +/* + * Copyright (c) 2000 Michael Shalayeff + * All rights reserved. + * + * based on a sparc version of Zubin Dittia. + * Copyright (c) 1995 Zubin Dittia. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Michael Shalayeff. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF + * THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/mbuf.h> +#include <netinet/in.h> + +/* + * Checksum routine for Internet Protocol family headers. + * + * This routine is very heavily used in the network + * code and should be modified for each CPU to be as fast as possible. + * + * HPPA version. + */ + +#define ADD32 asm volatile( "ldw 0x00(%1), %%r19! ldw 0x04(%1), %%r20\n\t" \ + "add %0, %%r19, %0 ! addc %0, %%r20, %0\n\t" \ + "ldw 0x08(%1), %%r19! ldw 0x0c(%1), %%r20\n\t" \ + "addc %0, %%r19, %0 ! addc %0, %%r20, %0\n\t" \ + "ldw 0x10(%1), %%r19! ldw 0x14(%1), %%r20\n\t" \ + "addc %0, %%r19, %0 ! addc %0, %%r20, %0\n\t" \ + "ldw 0x18(%1), %%r19! ldw 0x1c(%1), %%r20\n\t" \ + "addc %0, %%r19, %0 ! addc %0, %%r20, %0\n\t" \ + "ldo 0x20(%1), %1 ! addc %0, %%r0 , %0" \ + : "+r" (sum), "+r" (w) :: "r20", "r19") +#define ADD16 asm volatile( "ldw 0x00(%1), %%r19! ldw 0x04(%1), %%r20\n\t" \ + "add %0, %%r19, %0! addc %0, %%r20, %0\n\t" \ + "ldw 0x08(%1), %%r19! ldw 0x0c(%1), %%r20\n\t" \ + "addc %0, %%r19, %0! addc %0, %%r20, %0\n\t" \ + "ldo 0x10(%1), %1 ! addc %0, %%r0 , %0" \ + : "+r" (sum), "+r" (w) :: "r20", "r19") + +#define ADDCARRY {if (sum > 0xffff) sum -= 0xffff;} +#define REDUCE {sum = (sum & 0xffff) + (sum >> 16); ADDCARRY} +#define ROL asm volatile ("shd %0, %0, 8, %0" : "+r" (sum)) +#define ADDBYTE {ROL; sum += *w++; bins++; mlen--;} +#define ADDSHORT {sum += *((u_short *)w)++; mlen -= 2;} +#define ADDWORD asm volatile( "ldwm 4(%1), %%r19! add %0, %%r19, %0\n\t" \ + "ldo -4(%2), %2 ! addc %0, 0, %0" \ + : "+r" (sum), "+r" (w), "+r" (mlen) :: "r19") + +int +in_cksum(m, len) + register struct mbuf *m; + register int len; +{ + register u_int sum = 0; + register u_int bins = 0; + + for (; m && len; m = m->m_next) { + register int mlen = m->m_len; + register u_char *w; + + if (!mlen) + continue; + if (len < mlen) + mlen = len; + len -= mlen; + w = mtod(m, u_char *); + + if (mlen > 16) { + /* + * If we are aligned on a doubleword boundary + * do 32 bit bundled operations + */ + if ((7 & (u_long)w) != 0) { + if ((1 & (u_long)w) != 0) + ADDBYTE; + if ((2 & (u_long)w) != 0) + ADDSHORT; + if ((4 & (u_long)w) != 0) + ADDWORD; + } + + while ((mlen -= 32) >= 0) + ADD32; + + mlen += 32; + if (mlen >= 16) { + ADD16; + mlen -= 16; + } + } + + while (mlen > 0) + ADDBYTE; + } + if (bins & 1) + ROL; + REDUCE; + + return (0xffff ^ sum); +} |