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From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 16 Jul 2013 14:42:16 +0000 (UTC)
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Subject: svn commit: r253392 - head/sys/dev/acpica
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Author: jhb
Date: Tue Jul 16 14:42:16 2013
New Revision: 253392
URL: http://svnweb.freebsd.org/changeset/base/253392

Log:
  Workaround some broken BIOSes that specify edge-sensitive but active-low
  settings for ACPI-enumerated serial ports by forcing any IRQs that use
  an ISA IRQ value with these settings to active-high instead of active-low.
  
  This is known to occur with the BIOS on an Intel D2500CCE motherboard.
  
  Tested by:	Robert Ames <robertames@hotmail.com>, lev
  Submitted by:	Juergen Weiss weiss at uni-mainz.de (original patch)

Modified:
  head/sys/dev/acpica/acpi_resource.c

Modified: head/sys/dev/acpica/acpi_resource.c
==============================================================================
--- head/sys/dev/acpica/acpi_resource.c	Tue Jul 16 12:22:36 2013	(r253391)
+++ head/sys/dev/acpica/acpi_resource.c	Tue Jul 16 14:42:16 2013	(r253392)
@@ -135,6 +135,17 @@ acpi_config_intr(device_t dev, ACPI_RESO
     default:
 	panic("%s: bad resource type %u", __func__, res->Type);
     }
+
+#if defined(__amd64__) || defined(__i386__)
+    /*
+     * XXX: Certain BIOSes have buggy AML that specify an IRQ that is
+     * edge-sensitive and active-lo.  However, edge-sensitive IRQs
+     * should be active-hi.  Force IRQs with an ISA IRQ value to be
+     * active-hi instead.
+     */
+    if (irq < 16 && trig == ACPI_EDGE_SENSITIVE && pol == ACPI_ACTIVE_LOW)
+	pol = ACPI_ACTIVE_HIGH;
+#endif
     BUS_CONFIG_INTR(dev, irq, (trig == ACPI_EDGE_SENSITIVE) ?
 	INTR_TRIGGER_EDGE : INTR_TRIGGER_LEVEL, (pol == ACPI_ACTIVE_HIGH) ?
 	INTR_POLARITY_HIGH : INTR_POLARITY_LOW);