diff options
| -rw-r--r-- | hw/pci.c | 73 |
1 files changed, 69 insertions, 4 deletions
@@ -61,7 +61,7 @@ struct BusInfo pci_bus_info = { static void pci_update_mappings(PCIDevice *d); static void pci_set_irq(void *opaque, int irq_num, int level); -static int pci_add_option_rom(PCIDevice *pdev); +static int pci_add_option_rom(PCIDevice *pdev, bool is_default_rom); static void pci_del_option_rom(PCIDevice *pdev); static uint16_t pci_default_sub_vendor_id = PCI_SUBVENDOR_ID_REDHAT_QUMRANET; @@ -1571,6 +1571,7 @@ static int pci_qdev_init(DeviceState *qdev, DeviceInfo *base) PCIDeviceInfo *info = container_of(base, PCIDeviceInfo, qdev); PCIBus *bus; int devfn, rc; + bool is_default_rom; /* initialize cap_present for pci_is_express() and pci_config_size() */ if (info->is_express) { @@ -1591,9 +1592,12 @@ static int pci_qdev_init(DeviceState *qdev, DeviceInfo *base) } /* rom loading */ - if (pci_dev->romfile == NULL && info->romfile != NULL) + is_default_rom = false; + if (pci_dev->romfile == NULL && info->romfile != NULL) { pci_dev->romfile = qemu_strdup(info->romfile); - pci_add_option_rom(pci_dev); + is_default_rom = true; + } + pci_add_option_rom(pci_dev, is_default_rom); if (bus->hotplug) { /* Let buses differentiate between hotplug and when device is @@ -1701,8 +1705,64 @@ static void pci_map_option_rom(PCIDevice *pdev, int region_num, pcibus_t addr, p cpu_register_physical_memory(addr, size, pdev->rom_offset); } +/* Patch the PCI vendor and device ids in a PCI rom image if necessary. + This is needed for an option rom which is used for more than one device. */ +static void pci_patch_ids(PCIDevice *pdev, uint8_t *ptr, int size) +{ + uint16_t vendor_id; + uint16_t device_id; + uint16_t rom_vendor_id; + uint16_t rom_device_id; + uint16_t rom_magic; + uint16_t pcir_offset; + uint8_t checksum; + + /* Words in rom data are little endian (like in PCI configuration), + so they can be read / written with pci_get_word / pci_set_word. */ + + /* Only a valid rom will be patched. */ + rom_magic = pci_get_word(ptr); + if (rom_magic != 0xaa55) { + PCI_DPRINTF("Bad ROM magic %04x\n", rom_magic); + return; + } + pcir_offset = pci_get_word(ptr + 0x18); + if (pcir_offset + 8 >= size || memcmp(ptr + pcir_offset, "PCIR", 4)) { + PCI_DPRINTF("Bad PCIR offset 0x%x or signature\n", pcir_offset); + return; + } + + vendor_id = pci_get_word(pdev->config + PCI_VENDOR_ID); + device_id = pci_get_word(pdev->config + PCI_DEVICE_ID); + rom_vendor_id = pci_get_word(ptr + pcir_offset + 4); + rom_device_id = pci_get_word(ptr + pcir_offset + 6); + + PCI_DPRINTF("%s: ROM id %04x%04x / PCI id %04x%04x\n", pdev->romfile, + vendor_id, device_id, rom_vendor_id, rom_device_id); + + checksum = ptr[6]; + + if (vendor_id != rom_vendor_id) { + /* Patch vendor id and checksum (at offset 6 for etherboot roms). */ + checksum += (uint8_t)rom_vendor_id + (uint8_t)(rom_vendor_id >> 8); + checksum -= (uint8_t)vendor_id + (uint8_t)(vendor_id >> 8); + PCI_DPRINTF("ROM checksum %02x / %02x\n", ptr[6], checksum); + ptr[6] = checksum; + pci_set_word(ptr + pcir_offset + 4, vendor_id); + } + + if (device_id != rom_device_id) { + /* Patch device id and checksum (at offset 6 for etherboot roms). */ + checksum += (uint8_t)rom_device_id + (uint8_t)(rom_device_id >> 8); + checksum -= (uint8_t)device_id + (uint8_t)(device_id >> 8); + PCI_DPRINTF("ROM checksum %02x / %02x\n", ptr[6], checksum); + ptr[6] = checksum; + pci_set_word(ptr + pcir_offset + 6, device_id); + } +} + /* Add an option rom for the device */ -static int pci_add_option_rom(PCIDevice *pdev) +static int pci_add_option_rom(PCIDevice *pdev, bool is_default_rom) { int size; char *path; @@ -1753,6 +1813,11 @@ static int pci_add_option_rom(PCIDevice *pdev) load_image(path, ptr); qemu_free(path); + if (is_default_rom) { + /* Only the default rom images will be patched (if needed). */ + pci_patch_ids(pdev, ptr, size); + } + pci_register_bar(pdev, PCI_ROM_SLOT, size, 0, pci_map_option_rom); |