From 3a8680326098800670b849cc6026eac9a4e30472 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Sat, 24 Aug 2002 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2002-08-24

---
 alphapc/dat.h  |  6 +++++-
 alphapc/trap.c |  9 +++++++++
 pc/dat.h       | 10 +++++++---
 pc/main.c      |  5 +++++
 pc/pci.c       | 24 +++++++++++++-----------
 pc/trap.c      | 15 +++++++++++++--
 port/portdat.h |  2 +-
 7 files changed, 53 insertions(+), 18 deletions(-)

diff --git a/alphapc/dat.h b/alphapc/dat.h
index 637bcc1008c5a523911f917779045f649bc7535a..d863118c998c4fd13f85111066878489e1842bc2 100644
--- a/alphapc/dat.h
+++ b/alphapc/dat.h
@@ -47,9 +47,13 @@ struct Label
  */
 enum
 {
+	/* floating point states */
 	FPinit,
 	FPactive,
 	FPinactive,
+
+	/* bit or'd with the state */
+	FPillegal= 0x100,
 };
 
 struct	FPsave
@@ -243,7 +247,7 @@ typedef struct {
 
 struct DevConf
 {
-	ulong	interrupt;	/* interrupt number */
+	ulong	intnum;	/* interrupt number */
 	char		*type;	/* card type, malloced */
 	int		nports;	/* Number of ports */
 	port_t	*ports;	/* The ports themselves */
diff --git a/alphapc/trap.c b/alphapc/trap.c
index a066ee5f81d7731a404b184002a1158af7ae1bc9..bdc13bb7809dd5c1679c2b97b124849835b80d4a 100644
--- a/alphapc/trap.c
+++ b/alphapc/trap.c
@@ -521,6 +521,13 @@ notify(Ureg *ur)
 	spllo();
 	qlock(&up->debug);
 	up->notepending = 0;
+
+	if(up->fpstate == FPactive){
+		savefpregs(&up->fpsave);
+		up->fpstate = FPinactive;
+	}
+	up->fpstate |= FPillegal;
+
 	n = &up->note[0];
 	if(strncmp(n->msg, "sys:", 4) == 0) {
 		l = strlen(n->msg);
@@ -611,6 +618,8 @@ print("call to noted() when not notified\n");
 	}
 	up->notified = 0;
 
+	up->fpstate &= ~FPillegal;
+
 	nur = up->ureg;
 
 	oureg = (ulong)nur;
diff --git a/pc/dat.h b/pc/dat.h
index 7e93d7c14db51b56df65c6b4010385e56e2a870b..0532f1f18d7822dda12deb82bc9576a53badaaf5 100644
--- a/pc/dat.h
+++ b/pc/dat.h
@@ -45,9 +45,13 @@ struct Label
  */
 enum
 {
-	FPinit,
-	FPactive,
-	FPinactive,
+	/* this is a state */
+	FPinit=		0,
+	FPactive=	1,
+	FPinactive=	2,
+
+	/* the following is a bit that can be or'd into the state */
+	FPillegal=	0x100,
 };
 
 struct	FPsave
diff --git a/pc/main.c b/pc/main.c
index 1d9642965a83f8d167af5c401c412163c818fd73..874ed425d2ebd333e0451a4b75a1b31c56091bf9 100644
--- a/pc/main.c
+++ b/pc/main.c
@@ -487,6 +487,11 @@ matherror(Ureg *ur, void*)
 static void
 mathemu(Ureg*, void*)
 {
+	if(up->fpstate & FPillegal){
+		/* someone did floating point in a note handler */
+		postnote(up, 1, "sys: floating point in note handler", NDebug);
+		return;
+	}
 	switch(up->fpstate){
 	case FPinit:
 		fpinit();
diff --git a/pc/pci.c b/pc/pci.c
index e67eca9a657742aa2e76edb6bfdd5f1f8584770e..59370ef5ea30bc06f29740a172c1b6a18fd211a9 100644
--- a/pc/pci.c
+++ b/pc/pci.c
@@ -762,19 +762,19 @@ pcicfginit(void)
 	 * Mode2 uses a byte at 0xCF8 and another at 0xCFA; Mode1 uses
 	 * a DWORD at 0xCF8 and another at 0xCFC and will pass through
 	 * any non-DWORD accesses as normal I/O cycles. There shouldn't be
-	 * a device behind these addresses so if Mode2 accesses fail try
-	 * for Mode1 (which is preferred, Mode2 is deprecated).
+	 * a device behind these addresses so if Mode1 accesses fail try
+	 * for Mode2 (Mode2 is deprecated).
 	 */
-	outb(PciCSE, 0);
-	if(inb(PciCSE) == 0){
-		pcicfgmode = 2;
-		pcimaxdno = 15;
+	outl(PciADDR, 0);
+	if(inl(PciADDR) == 0){
+		pcicfgmode = 1;
+		pcimaxdno = 31;
 	}
-	else {
-		outl(PciADDR, 0);
-		if(inl(PciADDR) == 0){
-			pcicfgmode = 1;
-			pcimaxdno = 31;
+	else{
+		outb(PciCSE, 0);
+		if(inb(PciCSE) == 0){
+			pcicfgmode = 2;
+			pcimaxdno = 15;
 		}
 	}
 	
@@ -853,6 +853,8 @@ pcicfginit(void)
 out:
 	unlock(&pcicfginitlock);
 
+	if(getconf("*pcihinv"))
+		pcihinv(nil);
 }
 
 static int
diff --git a/pc/trap.c b/pc/trap.c
index 5fde0cd9308d36ec1d74be4f33609eef932b6dd0..0f827a541620c6cd8f2e5a4736a8870387fdd6dc 100644
--- a/pc/trap.c
+++ b/pc/trap.c
@@ -652,6 +652,12 @@ notify(Ureg* ureg)
 	if(up->nnote == 0)
 		return 0;
 
+	if(user && up->fpstate == FPactive){
+		fpsave(&up->fpsave);
+		up->fpstate = FPinactive;
+	}
+	up->fpstate |= FPillegal;
+
 	s = spllo();
 	qlock(&up->debug);
 	up->notepending = 0;
@@ -697,9 +703,9 @@ notify(Ureg* ureg)
 	sp -= BY2WD+ERRMAX;
 	memmove((char*)sp, up->note[0].msg, ERRMAX);
 	sp -= 3*BY2WD;
-	*(ulong*)(sp+2*BY2WD) = sp+3*BY2WD;	/* arg 2 is string */
+	*(ulong*)(sp+2*BY2WD) = sp+3*BY2WD;		/* arg 2 is string */
 	*(ulong*)(sp+1*BY2WD) = (ulong)up->ureg;	/* arg 1 is ureg* */
-	*(ulong*)(sp+0*BY2WD) = 0;		/* arg 0 is pc */
+	*(ulong*)(sp+0*BY2WD) = 0;			/* arg 0 is pc */
 	ureg->usp = sp;
 	ureg->pc = (ulong)up->notify;
 	up->notified = 1;
@@ -731,6 +737,8 @@ noted(Ureg* ureg, ulong arg0)
 
 	nureg = up->ureg;	/* pointer to user returned Ureg struct */
 
+	up->fpstate &= ~FPillegal;
+
 	/* sanity clause */
 	oureg = (ulong)nureg;
 	if(!okaddr((ulong)oureg-BY2WD, BY2WD+sizeof(Ureg), 0)){
@@ -807,6 +815,9 @@ execregs(ulong entry, ulong ssize, ulong nargs)
 	ulong *sp;
 	Ureg *ureg;
 
+	up->fpstate = FPinit;
+	fpoff();
+
 	sp = (ulong*)(USTKTOP - ssize);
 	*--sp = nargs;
 
diff --git a/port/portdat.h b/port/portdat.h
index 558fd6662273d284ab40e5622457842ba4fd03ca..406131b2ab3d255fc59eab610eb409cbb74e2965 100644
--- a/port/portdat.h
+++ b/port/portdat.h
@@ -589,7 +589,7 @@ struct Proc
 
 	ulong	parentpid;
 	ulong	time[6];	/* User, Sys, Real; child U, S, R */
-	short	insyscall;
+	int	insyscall;
 	int	fpstate;
 
 	QLock	debug;		/* to access debugging elements of User */