[PATCH] PCI Allow OutOfRange PIRQ table address

[linux-2.6-omap-h63xx.git] / arch / i386 / pci / irq.c

diff --git a/arch/i386/pci/irq.c b/arch/i386/pci/irq.c
index 83458f81e661ef7283936565e396f594780137e6..78ca1ecbb90728dad8e56b199550bfca66ac9d35 100644 (file)
--- a/arch/i386/pci/irq.c
+++ b/arch/i386/pci/irq.c
@@ -57,6 +57,35 @@ struct irq_router_handler {
 
 int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
 
+/*
+ *  Check passed address for the PCI IRQ Routing Table signature
+ *  and perform checksum verification.
+ */
+
+static inline struct irq_routing_table * pirq_check_routing_table(u8 *addr)
+{
+       struct irq_routing_table *rt;
+       int i;
+       u8 sum;
+
+       rt = (struct irq_routing_table *) addr;
+       if (rt->signature != PIRQ_SIGNATURE ||
+           rt->version != PIRQ_VERSION ||
+           rt->size % 16 ||
+           rt->size < sizeof(struct irq_routing_table))
+               return NULL;
+       sum = 0;
+       for (i=0; i < rt->size; i++)
+               sum += addr[i];
+       if (!sum) {
+               DBG("PCI: Interrupt Routing Table found at 0x%p\n", rt);
+               return rt;
+       }
+       return NULL;
+}
+
+
+
 /*
  *  Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
  */
@@ -65,23 +94,17 @@ static struct irq_routing_table * __init pirq_find_routing_table(void)
 {
        u8 *addr;
        struct irq_routing_table *rt;
-       int i;
-       u8 sum;
 
+       if (pirq_table_addr) {
+               rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
+               if (rt)
+                       return rt;
+               printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
+       }
        for(addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
-               rt = (struct irq_routing_table *) addr;
-               if (rt->signature != PIRQ_SIGNATURE ||
-                   rt->version != PIRQ_VERSION ||
-                   rt->size % 16 ||
-                   rt->size < sizeof(struct irq_routing_table))
-                       continue;
-               sum = 0;
-               for(i=0; i<rt->size; i++)
-                       sum += addr[i];
-               if (!sum) {
-                       DBG("PCI: Interrupt Routing Table found at 0x%p\n", rt);
+               rt = pirq_check_routing_table(addr);
+               if (rt)
                        return rt;
-               }
        }
        return NULL;
 }