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

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On SN systems, when setting the IORESOURCE_ROM_BIOS_COPY resource flag,
the resource length should be set to the actual size of the ROM image
so that a call to pci_map_rom() returns the correct size.

Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
John Keller 2007-07-09 11:42:24 -07:00 • committed by Tony Luck
parent 83ce6ef840
commit d7ad2254fa
4 changed files with 70 additions and 41 deletions
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73
drivers/pci/rom.c
View file

@ -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;
}