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Added PowerPC specific header checksum code.

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This commit is contained in:
Joel Sherrill
1999-02-04 14:56:09 +00:00
parent 8cce4452a5
commit 1564ca8e5e
5 changed files with 25 additions and 170 deletions
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39
c/src/exec/libnetworking/netinet/in_cksum_powerpc.c
View File

@@ -42,6 +42,7 @@ in_cksum(m, len)
register struct mbuf *m;
register int len;
{
u_char junk;
register u_short *w;
register unsigned sum = 0;
register unsigned tmp;
@@ -91,30 +92,13 @@ in_cksum(m, len)
mlen -= 2;
}
}
/*
* Advance to a cache line boundary.
*/
if (4 & (int) w && mlen >= 4) {
ADD(0);
MOP;
w += 2;
mlen -= 4;
}
if (8 & (int) w && mlen >= 8) {
ADD(0);
ADDC(4);
MOP;
w += 4;
mlen -= 8;
}
/*
* Do as much of the checksum as possible 32 bits at at time.
* In fact, this loop is unrolled to make overhead from
* branches &c small.
* In fact, this loop is unrolled to keep overhead from
* branches small.
*/
mlen -= 1;
while ((mlen -= 32) >= 0) {
u_char junk;
while (mlen >= 32) {
/*
* Add with carry 16 words and fold in the last
* carry by adding a 0 with carry.
@@ -133,19 +117,6 @@ in_cksum(m, len)
ADDC(28);
MOP;
w += 16;
}
mlen += 32 + 1;
if (mlen >= 32) {
ADD(16);
ADDC(0);
ADDC(4);
ADDC(8);
ADDC(12);
ADDC(20);
ADDC(24);
ADDC(28);
MOP;
w += 16;
mlen -= 32;
}
if (mlen >= 16) {

39
c/src/lib/libnetworking/netinet/in_cksum_powerpc.c
View File

@@ -42,6 +42,7 @@ in_cksum(m, len)
register struct mbuf *m;
register int len;
{
u_char junk;
register u_short *w;
register unsigned sum = 0;
register unsigned tmp;
@@ -91,30 +92,13 @@ in_cksum(m, len)
mlen -= 2;
}
}
/*
* Advance to a cache line boundary.
*/
if (4 & (int) w && mlen >= 4) {
ADD(0);
MOP;
w += 2;
mlen -= 4;
}
if (8 & (int) w && mlen >= 8) {
ADD(0);
ADDC(4);
MOP;
w += 4;
mlen -= 8;
}
/*
* Do as much of the checksum as possible 32 bits at at time.
* In fact, this loop is unrolled to make overhead from
* branches &c small.
* In fact, this loop is unrolled to keep overhead from
* branches small.
*/
mlen -= 1;
while ((mlen -= 32) >= 0) {
u_char junk;
while (mlen >= 32) {
/*
* Add with carry 16 words and fold in the last
* carry by adding a 0 with carry.
@@ -133,19 +117,6 @@ in_cksum(m, len)
ADDC(28);
MOP;
w += 16;
}
mlen += 32 + 1;
if (mlen >= 32) {
ADD(16);
ADDC(0);
ADDC(4);
ADDC(8);
ADDC(12);
ADDC(20);
ADDC(24);
ADDC(28);
MOP;
w += 16;
mlen -= 32;
}
if (mlen >= 16) {

39
c/src/libnetworking/netinet/in_cksum_powerpc.c
View File

@@ -42,6 +42,7 @@ in_cksum(m, len)
register struct mbuf *m;
register int len;
{
u_char junk;
register u_short *w;
register unsigned sum = 0;
register unsigned tmp;
@@ -91,30 +92,13 @@ in_cksum(m, len)
mlen -= 2;
}
}
/*
* Advance to a cache line boundary.
*/
if (4 & (int) w && mlen >= 4) {
ADD(0);
MOP;
w += 2;
mlen -= 4;
}
if (8 & (int) w && mlen >= 8) {
ADD(0);
ADDC(4);
MOP;
w += 4;
mlen -= 8;
}
/*
* Do as much of the checksum as possible 32 bits at at time.
* In fact, this loop is unrolled to make overhead from
* branches &c small.
* In fact, this loop is unrolled to keep overhead from
* branches small.
*/
mlen -= 1;
while ((mlen -= 32) >= 0) {
u_char junk;
while (mlen >= 32) {
/*
* Add with carry 16 words and fold in the last
* carry by adding a 0 with carry.
@@ -133,19 +117,6 @@ in_cksum(m, len)
ADDC(28);
MOP;
w += 16;
}
mlen += 32 + 1;
if (mlen >= 32) {
ADD(16);
ADDC(0);
ADDC(4);
ADDC(8);
ADDC(12);
ADDC(20);
ADDC(24);
ADDC(28);
MOP;
w += 16;
mlen -= 32;
}
if (mlen >= 16) {