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 00000000000..726a5ca4b16
--- /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; 
+                        } 
+                        
+                }
+        }
+}