pci_rom
struct pci_rom rom;
offsetof(struct pci_rom, rom_vendor));
offsetof(struct pci_rom, rom_product));
ptr + offsetof (struct pci_rom, rom_class));
ptr + offsetof (struct pci_rom, rom_subclass));
ptr + offsetof (struct pci_rom, rom_interface));
ptr + offsetof (struct pci_rom, rom_len));
ptr + offsetof (struct pci_rom, rom_code_type));
ptr + offsetof (struct pci_rom, rom_indicator));