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PCI: Introduce named defines for PCI ROM

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Convert the magic numbers associated with PCI ROM into named
definitions. Some of these definitions will be used in the second
fix patch.

Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Link: https://patch.msgid.link/20260508082128.3344255-2-kanie@linux.alibaba.com
This commit is contained in:
Guixin Liu 2026-05-08 16:21:27 +08:00 committed by Bjorn Helgaas
parent 254f49634e
commit 113e86bc58
1 changed files with 28 additions and 12 deletions
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40
drivers/pci/rom.c
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@ -5,13 +5,28 @@
* (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
* (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
*/
#include <linux/bits.h>
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/pci.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include "pci.h"
#define PCI_ROM_HEADER_SIZE 0x1A
#define PCI_ROM_POINTER_TO_DATA_STRUCT 0x18
#define PCI_ROM_LAST_IMAGE_INDICATOR 0x15
#define PCI_ROM_LAST_IMAGE_INDICATOR_BIT BIT(7)
#define PCI_ROM_IMAGE_LEN 0x10
#define PCI_ROM_IMAGE_SECTOR_SIZE SZ_512
#define PCI_ROM_IMAGE_SIGNATURE 0xAA55
/* Data structure signature is "PCIR" in ASCII representation */
#define PCI_ROM_DATA_STRUCT_SIGNATURE 0x52494350
#define PCI_ROM_DATA_STRUCT_LEN 0x0A
/**
* pci_enable_rom - enable ROM decoding for a PCI device
* @pdev: PCI device to enable
@ -91,26 +106,27 @@ static size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom,
do {
void __iomem *pds;
/* Standard PCI ROMs start out with these bytes 55 AA */
if (readw(image) != 0xAA55) {
pci_info(pdev, "Invalid PCI ROM header signature: expecting 0xaa55, got %#06x\n",
readw(image));
if (readw(image) != PCI_ROM_IMAGE_SIGNATURE) {
pci_info(pdev, "Invalid PCI ROM header signature: expecting %#06x, got %#06x\n",
PCI_ROM_IMAGE_SIGNATURE, readw(image));
break;
}
/* get the PCI data structure and check its "PCIR" signature */
pds = image + readw(image + 24);
if (readl(pds) != 0x52494350) {
pci_info(pdev, "Invalid PCI ROM data signature: expecting 0x52494350, got %#010x\n",
readl(pds));
/* Get the PCI data structure and check its "PCIR" signature */
pds = image + readw(image + PCI_ROM_POINTER_TO_DATA_STRUCT);
if (readl(pds) != PCI_ROM_DATA_STRUCT_SIGNATURE) {
pci_info(pdev, "Invalid PCI ROM data signature: expecting %#010x, got %#010x\n",
PCI_ROM_DATA_STRUCT_SIGNATURE, readl(pds));
break;
}
last_image = readb(pds + 21) & 0x80;
length = readw(pds + 16);
image += length * 512;
last_image = readb(pds + PCI_ROM_LAST_IMAGE_INDICATOR) &
PCI_ROM_LAST_IMAGE_INDICATOR_BIT;
length = readw(pds + PCI_ROM_IMAGE_LEN);
image += length * PCI_ROM_IMAGE_SECTOR_SIZE;
/* Avoid iterating through memory outside the resource window */
if (image >= rom + size)
break;
if (!last_image) {
if (readw(image) != 0xAA55) {
if (readw(image) != PCI_ROM_IMAGE_SIGNATURE) {
pci_info(pdev, "No more image in the PCI ROM\n");
break;
}