From d705bfa698806e7e7a6220e43b207f09f93c1643 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Fri, 22 Sep 2000 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2000-09-22

---
 ip/ethermedium.c | 17 +++++++++++++++++
 pc/devarch.c     | 16 +++++++++++++---
 pc/ptclbsum386.s | 13 +------------
 3 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/ip/ethermedium.c b/ip/ethermedium.c
index b15f6f06d2f1b375c24f112c3320e1958a089220..dc3870a27e6a54ed80dcb176f7a228e2929976ed 100644
--- a/ip/ethermedium.c
+++ b/ip/ethermedium.c
@@ -44,6 +44,22 @@ Medium ethermedium =
 .areg=		sendgarp,
 };
 
+Medium gbemedium =
+{
+.name=		"gbe",
+.hsize=		14,
+.minmtu=	60,
+.maxmtu=	9014,
+.maclen=	6,
+.bind=		etherbind,
+.unbind=	etherunbind,
+.bwrite=	etherbwrite,
+.addmulti=	etheraddmulti,
+.remmulti=	etherremmulti,
+.ares=		arpenter,
+.areg=		sendgarp,
+};
+
 typedef struct	Etherrock Etherrock;
 struct Etherrock
 {
@@ -561,4 +577,5 @@ void
 ethermediumlink(void)
 {
 	addipmedium(&ethermedium);
+	addipmedium(&gbemedium);
 }
diff --git a/pc/devarch.c b/pc/devarch.c
index b6563b39f5a5c98ecbf51393fe7d279229d22739..71a85f015e50c40beb28734cfdf13158ce3aeee1 100644
--- a/pc/devarch.c
+++ b/pc/devarch.c
@@ -482,10 +482,11 @@ cpuidprint(void)
 int
 cpuidentify(void)
 {
-	int family, model;
+	char *p;
+	int family, model, nomce;
 	X86type *t;
 	ulong cr4;
-	vlong mct;
+	vlong mca, mct;
 
 	cpuid(m->cpuidid, &m->cpuidax, &m->cpuiddx);
 	if(strncmp(m->cpuidid, "AuthenticAMD", 12) == 0)
@@ -515,8 +516,17 @@ cpuidentify(void)
 		cr4 = 0;
 		if(m->cpuiddx & 0x08)
 			cr4 |= 0x10;		/* page size extensions */
-		if(m->cpuiddx & 0x80)
+		if(p = getconf("*nomce"))
+			nomce = strtoul(p, 0, 0);
+		else
+			nomce = 0;
+		if((m->cpuiddx & 0x80) && !nomce){
 			cr4 |= 0x40;		/* machine check enable */
+			if(family == 5){
+				rdmsr(0x00, &mca);
+				rdmsr(0x01, &mct);
+			}
+		}
 		putcr4(cr4);
 		if(m->cpuiddx & 0x80)
 			rdmsr(0x01, &mct);
diff --git a/pc/ptclbsum386.s b/pc/ptclbsum386.s
index 6e44302461fc6d2aefad0f766e5c0fba6b022278..ba0a6a4d14e05cbc87b5b19c23bdf10b6db2bdb8 100644
--- a/pc/ptclbsum386.s
+++ b/pc/ptclbsum386.s
@@ -84,23 +84,12 @@ _2loop:
 	CMPL	CX, $0x02
 	JLT	_1dreg
 
-_2fold:
-	MOVL	AX, BX
-	SHRL	$16, BX
-	JEQ	_2foldx
-
-	ANDL	$0xFFFF, AX
-	ADDL	BX, AX
-	JMP	_2fold
-
-_2foldx:
 	MOVL	CX, BP
 	SHRL	$1, BP
 	ANDL	$0x01, CX
 
 _2loopx:
-	XORL	BX, BX			/* in the loop for PPro */
-	MOVW	0x00(SI), BX
+	MOVWLZX	0x00(SI), BX
 	ADCL	BX, AX
 
 	LEAL	0x02(SI), SI