This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / i386 / pci / pcifront.c

diff --git a/arch/i386/pci/pcifront.c b/arch/i386/pci/pcifront.c
new file mode 100644 (file)
index 0000000..7009115
--- /dev/null
+++ b/arch/i386/pci/pcifront.c
@@ -0,0 +1,55 @@
+/*
+ * PCI Frontend Stub - puts some "dummy" functions in to the Linux x86 PCI core
+ *                     to support the Xen PCI Frontend's operation
+ *
+ *   Author: Ryan Wilson <hap9@epoch.ncsc.mil>
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <asm/acpi.h>
+#include "pci.h"
+
+static int pcifront_enable_irq(struct pci_dev *dev)
+{
+       u8 irq;
+       pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
+       dev->irq = irq;
+
+       return 0;
+}
+
+extern u8 pci_cache_line_size;
+
+static int __init pcifront_x86_stub_init(void)
+{
+       struct cpuinfo_x86 *c = &boot_cpu_data;
+
+       /* Only install our method if we haven't found real hardware already */
+       if (raw_pci_ops)
+               return 0;
+
+       printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
+
+       /* Copied from arch/i386/pci/common.c */
+       pci_cache_line_size = 32 >> 2;
+       if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
+               pci_cache_line_size = 64 >> 2;  /* K7 & K8 */
+       else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
+               pci_cache_line_size = 128 >> 2; /* P4 */
+
+       /* On x86, we need to disable the normal IRQ routing table and
+        * just ask the backend
+        */
+       pcibios_enable_irq = pcifront_enable_irq;
+       pcibios_disable_irq = NULL;
+
+#ifdef CONFIG_ACPI
+       /* Keep ACPI out of the picture */
+       acpi_noirq = 1;
+#endif
+
+       return 0;
+}
+
+arch_initcall(pcifront_x86_stub_init);