From 028480bfb1299a0a34ad19f20e2cc3f24b402235 Mon Sep 17 00:00:00 2001
From: tegge <tegge@FreeBSD.org>
Date: Wed, 1 Apr 1998 21:07:37 +0000
Subject: Add two workarounds for broken MP tables:

	- Attempt to handle PCI devices where the interrupt is
	  an ISA/EISA interrupt according to the mp table.

	- Attempt to handle multiple IO APIC pins connected to
	  the same PCI or ISA/EISA interrupt source.  Print a
	  warning if this happens, since performance is suboptimal.
	  This workaround is only used for PCI devices.

With these two workarounds, the -SMP kernel is capable of running on
my Asus P/I-P65UP5 motherboard when version 1.4 of the MP table is disabled.
---
 sys/i386/include/mptable.h | 51 ++++++++++++++++++++++++++++++++++++++++++++--
 sys/i386/include/smp.h     |  3 ++-
 2 files changed, 51 insertions(+), 3 deletions(-)

(limited to 'sys/i386/include')

diff --git a/sys/i386/include/mptable.h b/sys/i386/include/mptable.h
index aa6adb9..6657ae48 100644
--- a/sys/i386/include/mptable.h
+++ b/sys/i386/include/mptable.h
@@ -22,7 +22,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: mp_machdep.c,v 1.69 1998/03/03 22:56:24 tegge Exp $
+ *	$Id: mp_machdep.c,v 1.70 1998/03/07 20:16:49 tegge Exp $
  */
 
 #include "opt_smp.h"
@@ -1199,7 +1199,6 @@ isa_apic_pin(int isa_irq)
 	}
 	return -1;					/* NOT found */
 }
-#undef SRCBUSIRQ
 
 
 /*
@@ -1225,9 +1224,57 @@ pci_apic_pin(int pciBus, int pciDevice, int pciInt)
 
 	return -1;					/* NOT found */
 }
+
+int
+next_apic_pin(int pin) 
+{
+	int intr, ointr;
+	int bus, bustype;
+
+	bus = 0;
+	bustype = 0;
+	for (intr = 0; intr < nintrs; intr++) {
+		if (INTPIN(intr) != pin || INTTYPE(intr) != 0)
+			continue;
+		bus = SRCBUSID(intr);
+		bustype = apic_bus_type(bus);
+		if (bustype != ISA &&
+		    bustype != EISA &&
+		    bustype != PCI)
+			continue;
+		break;
+	}
+	if (intr >= nintrs) {
+		return -1;
+	}
+	for (ointr = intr + 1; ointr < nintrs; ointr++) {
+		if (INTTYPE(ointr) != 0)
+			continue;
+		if (bus != SRCBUSID(ointr))
+			continue;
+		if (bustype == PCI) {
+			if (SRCBUSDEVICE(intr) != SRCBUSDEVICE(ointr))
+				continue;
+			if (SRCBUSLINE(intr) != SRCBUSLINE(ointr))
+				continue;
+		}
+		if (bustype == ISA || bustype == EISA) {
+			if (SRCBUSIRQ(intr) != SRCBUSIRQ(ointr))
+				continue;
+		}
+		if (INTPIN(intr) == INTPIN(ointr))
+			continue;
+		break;
+	}
+	if (ointr >= nintrs) {
+		return -1;
+	}
+	return INTPIN(ointr);
+}
 #undef SRCBUSLINE
 #undef SRCBUSDEVICE
 #undef SRCBUSID
+#undef SRCBUSIRQ
 
 #undef INTPIN
 #undef INTTYPE
diff --git a/sys/i386/include/smp.h b/sys/i386/include/smp.h
index b31aadd..283c925 100644
--- a/sys/i386/include/smp.h
+++ b/sys/i386/include/smp.h
@@ -6,7 +6,7 @@
  * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
  * ----------------------------------------------------------------------------
  *
- * $Id: smp.h,v 1.40 1998/03/07 21:34:59 dyson Exp $
+ * $Id: smp.h,v 1.41 1998/04/01 20:38:28 tegge Exp $
  *
  */
 
@@ -112,6 +112,7 @@ void	mp_announce		__P((void));
 u_int	isa_apic_mask		__P((u_int));
 int	isa_apic_pin		__P((int));
 int	pci_apic_pin		__P((int, int, int));
+int	next_apic_pin		__P((int));
 int	undirect_isa_irq	__P((int));
 int	undirect_pci_irq	__P((int));
 int	apic_bus_type		__P((int));
-- 
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