+
+static int pci_device_linux_sysfs_boot_vga(struct pci_device *dev)
+{
+ char name[256];
+ char reply[3];
+ int fd, bytes_read;
+ int ret = 0;
+
+ snprintf( name, 255, "%s/%04x:%02x:%02x.%1u/boot_vga",
+ SYS_BUS_PCI,
+ dev->domain,
+ dev->bus,
+ dev->dev,
+ dev->func );
+
+ fd = open( name, O_RDONLY );
+ if (fd == -1)
+ return 0;
+
+ bytes_read = read(fd, reply, 1);
+ if (bytes_read != 1)
+ goto out;
+ if (reply[0] == '1')
+ ret = 1;
+out:
+ close(fd);
+ return ret;
+}
+
+static int pci_device_linux_sysfs_has_kernel_driver(struct pci_device *dev)
+{
+ char name[256];
+ struct stat dummy;
+ int ret;
+
+ snprintf( name, 255, "%s/%04x:%02x:%02x.%1u/driver",
+ SYS_BUS_PCI,
+ dev->domain,
+ dev->bus,
+ dev->dev,
+ dev->func );
+
+ ret = stat(name, &dummy);
+ if (ret < 0)
+ return 0;
+ return 1;
+}
+
+static struct pci_io_handle *
+pci_device_linux_sysfs_open_device_io(struct pci_io_handle *ret,
+ struct pci_device *dev, int bar,
+ pciaddr_t base, pciaddr_t size)
+{
+ char name[PATH_MAX];
+
+ snprintf(name, PATH_MAX, "%s/%04x:%02x:%02x.%1u/resource%d",
+ SYS_BUS_PCI, dev->domain, dev->bus, dev->dev, dev->func, bar);
+
+ ret->fd = open(name, O_RDWR);
+
+ if (ret->fd < 0)
+ return NULL;
+
+ ret->base = base;
+ ret->size = size;
+
+ return ret;
+}
+
+static struct pci_io_handle *
+pci_device_linux_sysfs_open_legacy_io(struct pci_io_handle *ret,
+ struct pci_device *dev, pciaddr_t base,
+ pciaddr_t size)
+{
+ char name[PATH_MAX];
+
+ /* First check if there's a legacy io method for the device */
+ while (dev) {
+ snprintf(name, PATH_MAX, "/sys/class/pci_bus/%04x:%02x/legacy_io",
+ dev->domain, dev->bus);
+
+ ret->fd = open(name, O_RDWR);
+ if (ret->fd >= 0)
+ break;
+
+ dev = pci_device_get_parent_bridge(dev);
+ }
+
+ /* If not, /dev/port is the best we can do */
+ if (!dev)
+ ret->fd = open("/dev/port", O_RDWR);
+
+ if (ret->fd < 0)
+ return NULL;
+
+ ret->base = base;
+ ret->size = size;
+
+ return ret;
+}
+
+static void
+pci_device_linux_sysfs_close_io(struct pci_device *dev,
+ struct pci_io_handle *handle)
+{
+ close(handle->fd);
+}
+
+static uint32_t
+pci_device_linux_sysfs_read32(struct pci_io_handle *handle, uint32_t port)
+{
+ uint32_t ret;
+
+ pread(handle->fd, &ret, 4, port + handle->base);
+
+ return ret;
+}
+
+static uint16_t
+pci_device_linux_sysfs_read16(struct pci_io_handle *handle, uint32_t port)
+{
+ uint16_t ret;
+
+ pread(handle->fd, &ret, 2, port + handle->base);
+
+ return ret;
+}
+
+static uint8_t
+pci_device_linux_sysfs_read8(struct pci_io_handle *handle, uint32_t port)
+{
+ uint8_t ret;
+
+ pread(handle->fd, &ret, 1, port + handle->base);
+
+ return ret;
+}
+
+static void
+pci_device_linux_sysfs_write32(struct pci_io_handle *handle, uint32_t port,
+ uint32_t data)
+{
+ pwrite(handle->fd, &data, 4, port + handle->base);
+}
+
+static void
+pci_device_linux_sysfs_write16(struct pci_io_handle *handle, uint32_t port,
+ uint16_t data)
+{
+ pwrite(handle->fd, &data, 2, port + handle->base);
+}
+
+static void
+pci_device_linux_sysfs_write8(struct pci_io_handle *handle, uint32_t port,
+ uint8_t data)
+{
+ pwrite(handle->fd, &data, 1, port + handle->base);
+}
+
+static const struct pci_system_methods linux_sysfs_methods = {
+ .destroy = NULL,
+ .destroy_device = NULL,
+ .read_rom = pci_device_linux_sysfs_read_rom,
+ .probe = pci_device_linux_sysfs_probe,
+ .map_range = pci_device_linux_sysfs_map_range,
+ .unmap_range = pci_device_linux_sysfs_unmap_range,
+
+ .read = pci_device_linux_sysfs_read,
+ .write = pci_device_linux_sysfs_write,
+
+ .fill_capabilities = pci_fill_capabilities_generic,
+ .enable = pci_device_linux_sysfs_enable,
+ .boot_vga = pci_device_linux_sysfs_boot_vga,
+ .has_kernel_driver = pci_device_linux_sysfs_has_kernel_driver,
+
+ .open_device_io = pci_device_linux_sysfs_open_device_io,
+ .open_legacy_io = pci_device_linux_sysfs_open_legacy_io,
+ .close_io = pci_device_linux_sysfs_close_io,
+ .read32 = pci_device_linux_sysfs_read32,
+ .read16 = pci_device_linux_sysfs_read16,
+ .read8 = pci_device_linux_sysfs_read8,
+ .write32 = pci_device_linux_sysfs_write32,
+ .write16 = pci_device_linux_sysfs_write16,
+ .write8 = pci_device_linux_sysfs_write8,
+};