1 files changed, 51 insertions, 0 deletions
diff --git a/arch/i386/kernel/acpi/earlyquirk.c b/arch/i386/kernel/acpi/earlyquirk.c
new file mode 100644
index 000000000000..726a5ca4b165
--- /dev/null
+++ b/arch/i386/kernel/acpi/earlyquirk.c
@@ -0,0 +1,51 @@
+/* 
+ * Do early PCI probing for bug detection when the main PCI subsystem is 
+ * not up yet.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <asm/pci-direct.h>
+#include <asm/acpi.h>
+
+static int __init check_bridge(int vendor, int device) 
+{
+	/* According to Nvidia all timer overrides are bogus. Just ignore
+	   them all. */
+	if (vendor == PCI_VENDOR_ID_NVIDIA) { 
+		acpi_skip_timer_override = 1; 		
+	}
+	return 0;
+}
+   
+void __init check_acpi_pci(void) 
+{ 
+	int num,slot,func; 
+
+	/* Assume the machine supports type 1. If not it will 
+	   always read ffffffff and should not have any side effect. */
+
+	/* Poor man's PCI discovery */
+	for (num = 0; num < 32; num++) { 
+		for (slot = 0; slot < 32; slot++) { 
+			for (func = 0; func < 8; func++) { 
+				u32 class;
+				u32 vendor;
+				class = read_pci_config(num,slot,func,
+							PCI_CLASS_REVISION);
+				if (class == 0xffffffff)
+					break; 
+
+				if ((class >> 16) != PCI_CLASS_BRIDGE_PCI)
+					continue; 
+				
+				vendor = read_pci_config(num, slot, func, 
+							 PCI_VENDOR_ID);
+				
+				if (check_bridge(vendor&0xffff, vendor >> 16))
+					return; 
+			} 
+			
+		}
+	}
+}