From d126254a4f0f4d257ed191f9230352ce664f6015 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 12 Jan 1999 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1999-01-12

---
 pc/archgeneric.c |  2 +-
 pc/ether79c970.c | 19 ++++++++++++++++---
 port/fault.c     | 26 ++++----------------------
 port/swap.c      |  4 ----
 4 files changed, 21 insertions(+), 30 deletions(-)

diff --git a/pc/archgeneric.c b/pc/archgeneric.c
index 1e4645c38f24ecca3d4436e51426f95274cd2a5d..6b9716ba81ebd3661c9911afcf5935cd5567b73e 100644
--- a/pc/archgeneric.c
+++ b/pc/archgeneric.c
@@ -201,7 +201,7 @@ archinit(void)
 	if(X86FAMILY(m->cpuidax) == 3 || conf.nmach > 1)
 		conf.copymode = 1;
 
-	if(X86FAMILY(m->cpuidax) == 6 /*&& conf.nmach > 1*/)
+	if(X86FAMILY(m->cpuidax) >= 5)
 		coherence = wbflush;
 }
 
diff --git a/pc/ether79c970.c b/pc/ether79c970.c
index 741bfa8692010d355fe09edeb3a7fefb033d497c..761692edd7436bc27a4d2006696b0496fdb4859b 100644
--- a/pc/ether79c970.c
+++ b/pc/ether79c970.c
@@ -132,6 +132,10 @@ typedef struct Ctlr {
 	ulong	lcol;
 	ulong	uflo;
 	ulong	txbuff;
+
+	ulong	merr;			/* bobf is such a whiner */
+	ulong	miss;
+	ulong	babl;
 } Ctlr;
 
 #define csr32r(c, r)	(inl((c)->port+(r)))
@@ -179,7 +183,10 @@ ifstat(Ether* ether, void* a, long n, ulong offset)
 	len += snprint(p+len, READSTR-len, "Lcar: %ld\n", ctlr->lcar);
 	len += snprint(p+len, READSTR-len, "Lcol: %ld\n", ctlr->lcol);
 	len += snprint(p+len, READSTR-len, "Uflo: %ld\n", ctlr->uflo);
-	snprint(p+len, READSTR-len, "Txbuff: %ld\n", ctlr->txbuff);
+	len += snprint(p+len, READSTR-len, "Txbuff: %ld\n", ctlr->txbuff);
+	len += snprint(p+len, READSTR-len, "Merr: %ld\n", ctlr->merr);
+	len += snprint(p+len, READSTR-len, "Miss: %ld\n", ctlr->miss);
+	snprint(p+len, READSTR-len, "Babl: %ld\n", ctlr->babl);
 
 	n = readstr(offset, a, n, p);
 	free(p);
@@ -326,8 +333,14 @@ interrupt(Ureg*, void* arg)
 intrloop:
 	csr0 = csr32r(ctlr, Rdp) & 0xFFFF;
 	csr32w(ctlr, Rdp, Babl|Cerr|Miss|Merr|Rint|Tint|Iena);
-	if(csr0 & (Babl|Miss|Merr))
-		print("#l%d: csr0 = 0x%uX\n", ether->ctlrno, csr0);
+	if(csr0 & Merr)
+		ctlr->merr++;
+	if(csr0 & Miss)
+		ctlr->miss++;
+	if(csr0 & Babl)
+		ctlr->babl++;
+	//if(csr0 & (Babl|Miss|Merr))
+	//	print("#l%d: csr0 = 0x%uX\n", ether->ctlrno, csr0);
 	if(!(csr0 & (Rint|Tint)))
 		return;
 
diff --git a/port/fault.c b/port/fault.c
index 1ed8c118cd75081e0cc69921575cf75d71f645e0..9b8b342ff29e3b43d70b3753bae2b52f4864b86e 100644
--- a/port/fault.c
+++ b/port/fault.c
@@ -87,21 +87,6 @@ fixfault(Segment *s, ulong addr, int read, int doputmmu)
 		(*pg)->modref = PG_REF;
 		break;
 
-	case SG_SHDATA:			/* Shared data */
-	shared:
-		if(pagedout(*pg))
-			pio(s, addr, soff, pg);
-
-		lkp = *pg;
-		lock(lkp);
-
-		/* save a copy of the original for the image cache */
-		if(lkp->image)
-			duppage(lkp);
-
-		unlock(lkp);
-		goto done;
-
 	case SG_BSS:
 	case SG_SHARED:			/* Zero fill on demand */
 	case SG_STACK:
@@ -117,13 +102,11 @@ fixfault(Segment *s, ulong addr, int read, int doputmmu)
 
 			*pg = new;
 		}
-		if(type == SG_SHARED)
-			goto shared;
-
-		goto notshared;
+		goto common;
 
 	case SG_DATA:
-	notshared:			/* Demand load/pagein/copy on write */
+	case SG_SHDATA:
+	common:			/* Demand load/pagein/copy on write */
 		if(pagedout(*pg))
 			pio(s, addr, soff, pg);
 
@@ -135,6 +118,7 @@ fixfault(Segment *s, ulong addr, int read, int doputmmu)
 
 		lkp = *pg;
 		lock(lkp);
+
 		if(lkp->image == &swapimage)
 			ref = lkp->ref + swapcount(lkp->daddr);
 		else
@@ -155,7 +139,6 @@ fixfault(Segment *s, ulong addr, int read, int doputmmu)
 
 			unlock(lkp);
 		}
-	done:
 		mmuphys = PPN((*pg)->pa) | PTEWRITE|PTEVALID;
 		(*pg)->modref = PG_MOD|PG_REF;
 		break;
@@ -289,7 +272,6 @@ retry:
 				putpage(new);
 				goto done;
 			} else {
-print("!");
 				/* another process and the pager got in */
 				putpage(new);
 				goto retry;
diff --git a/port/swap.c b/port/swap.c
index 4b7c7504fd698c3be5b55b65243166f06a7b1bbe..337bdf0788d471d0d16ad0ccaa19c43028c2d8f3 100644
--- a/port/swap.c
+++ b/port/swap.c
@@ -338,14 +338,12 @@ executeio(void)
 		if(ioptr > conf.nswppo)
 			panic("executeio: ioptr %d > %d\n", ioptr, conf.nswppo);
 		out = iolist[i];
-		up->psstate = "I/Okm";
 		k = kmap(out);
 		kaddr = (char*)VA(k);
 
 		if(waserror())
 			panic("executeio: page out I/O error");
 
-		up->psstate = "I/Owr";
 		n = devtab[c->type]->write(c, kaddr, BY2PG, out->daddr);
 		if(n != BY2PG)
 			nexterror();
@@ -354,11 +352,9 @@ executeio(void)
 		poperror();
 
 		/* Free up the page after I/O */
-		up->psstate = "I/Odec";
 		lock(out);
 		out->ref--;
 		unlock(out);
-		up->psstate = "I/Oput";
 		putpage(out);
 	}
 	ioptr = 0;