[Patch 3/5] xbox: block certain PCI devices

[Ed Schouten]

When probing certain devices or busses on the Xbox, the system may hang.
Therefore, we need to blacklist certain busses.

You can also download this patch at:
http://linux.g-rave.nl/patches/patch-xbox-pci_workaround.diff
---

 direct.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+)

diff -u -r --new-file linux-2.6.9-rc3/arch/i386/pci/direct.c
linux-2.6.9-rc3-ed0/arch/i386/pci/direct.c
--- linux-2.6.9-rc3/arch/i386/pci/direct.c	2004-09-30 05:04:23.000000000
+0200
+++ linux-2.6.9-rc3-ed0/arch/i386/pci/direct.c	2004-10-09
19:49:54.677610000 +0200
@@ -20,6 +20,22 @@
 	if (!value || (bus > 255) || (devfn > 255) || (reg > 255))
 		return -EINVAL;

+#ifdef CONFIG_X86_XBOX
+	/*
+	 * Workaround for the Microsoft Xbox:
+	 * Prevent it from tampering with some devices.
+	 */
+	if ((bus == 0) && !PCI_SLOT(devfn) &&
+			((PCI_FUNC(devfn) == 1) || (PCI_FUNC(devfn) == 2)))
+		return -EINVAL;
+
+	if ((bus == 1) && (PCI_SLOT(devfn) || PCI_FUNC(devfn)))
+		return -EINVAL;
+
+	if (bus >= 2)
+		return -EINVAL;
+#endif
+
 	spin_lock_irqsave(&pci_config_lock, flags);

 	outl(PCI_CONF1_ADDRESS(bus, devfn, reg), 0xCF8);
-
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