[IA64] SN: Correct ROM resource length for BIOS copy

[linux-2.6-omap-h63xx.git] / drivers / pci / rom.c

diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index d087e0817715a71a9405415d24f47220552c3533..dbbcc04abd1af1fe06eafc7be1a647d847233e25 100644 (file)
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -53,6 +53,49 @@ static void pci_disable_rom(struct pci_dev *pdev)
        pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
 }
 
+/**
+ * pci_get_rom_size - obtain the actual size of the ROM image
+ * @rom: kernel virtual pointer to image of ROM
+ * @size: size of PCI window
+ *  return: size of actual ROM image
+ *
+ * Determine the actual length of the ROM image.
+ * The PCI window size could be much larger than the
+ * actual image size.
+ */
+size_t pci_get_rom_size(void __iomem *rom, size_t size)
+{
+       void __iomem *image;
+       int last_image;
+
+       image = rom;
+       do {
+               void __iomem *pds;
+               /* Standard PCI ROMs start out with these bytes 55 AA */
+               if (readb(image) != 0x55)
+                       break;
+               if (readb(image + 1) != 0xAA)
+                       break;
+               /* get the PCI data structure and check its signature */
+               pds = image + readw(image + 24);
+               if (readb(pds) != 'P')
+                       break;
+               if (readb(pds + 1) != 'C')
+                       break;
+               if (readb(pds + 2) != 'I')
+                       break;
+               if (readb(pds + 3) != 'R')
+                       break;
+               last_image = readb(pds + 21) & 0x80;
+               /* this length is reliable */
+               image += readw(pds + 16) * 512;
+       } while (!last_image);
+
+       /* never return a size larger than the PCI resource window */
+       /* there are known ROMs that get the size wrong */
+       return min((size_t)(image - rom), size);
+}
+
 /**
  * pci_map_rom - map a PCI ROM to kernel space
  * @pdev: pointer to pci device struct
@@ -68,8 +111,6 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
        struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
        loff_t start;
        void __iomem *rom;
-       void __iomem *image;
-       int last_image;
 
        /*
         * IORESOURCE_ROM_SHADOW set on x86, x86_64 and IA64 supports legacy
@@ -117,33 +158,7 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
         * size is much larger than the actual size of the ROM.
         * True size is important if the ROM is going to be copied.
         */
-       image = rom;
-       do {
-               void __iomem *pds;
-               /* Standard PCI ROMs start out with these bytes 55 AA */
-               if (readb(image) != 0x55)
-                       break;
-               if (readb(image + 1) != 0xAA)
-                       break;
-               /* get the PCI data structure and check its signature */
-               pds = image + readw(image + 24);
-               if (readb(pds) != 'P')
-                       break;
-               if (readb(pds + 1) != 'C')
-                       break;
-               if (readb(pds + 2) != 'I')
-                       break;
-               if (readb(pds + 3) != 'R')
-                       break;
-               last_image = readb(pds + 21) & 0x80;
-               /* this length is reliable */
-               image += readw(pds + 16) * 512;
-       } while (!last_image);
-
-       /* never return a size larger than the PCI resource window */
-       /* there are known ROMs that get the size wrong */
-       *size = min((size_t)(image - rom), *size);
-
+       *size = pci_get_rom_size(rom, *size);
        return rom;
 }