+ return i;
+}
+
+static u64 __devinit
+add_io_space (struct pci_root_info *info, struct acpi_resource_address64 *addr)
+{
+ struct resource *resource;
+ char *name;
+ u64 base, min, max, base_port;
+ unsigned int sparse = 0, space_nr, len;
+
+ resource = kzalloc(sizeof(*resource), GFP_KERNEL);
+ if (!resource) {
+ printk(KERN_ERR "PCI: No memory for %s I/O port space\n",
+ info->name);
+ goto out;
+ }
+
+ len = strlen(info->name) + 32;
+ name = kzalloc(len, GFP_KERNEL);
+ if (!name) {
+ printk(KERN_ERR "PCI: No memory for %s I/O port space name\n",
+ info->name);
+ goto free_resource;
+ }
+
+ min = addr->minimum;
+ max = min + addr->address_length - 1;
+ if (addr->info.io.translation_type == ACPI_SPARSE_TRANSLATION)
+ sparse = 1;
+
+ space_nr = new_space(addr->translation_offset, sparse);
+ if (space_nr == ~0)
+ goto free_name;
+
+ base = __pa(io_space[space_nr].mmio_base);
+ base_port = IO_SPACE_BASE(space_nr);
+ snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
+ base_port + min, base_port + max);
+
+ /*
+ * The SDM guarantees the legacy 0-64K space is sparse, but if the
+ * mapping is done by the processor (not the bridge), ACPI may not
+ * mark it as sparse.
+ */
+ if (space_nr == 0)
+ sparse = 1;
+
+ resource->name = name;
+ resource->flags = IORESOURCE_MEM;
+ resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
+ resource->end = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
+ insert_resource(&iomem_resource, resource);
+
+ return base_port;
+
+free_name:
+ kfree(name);
+free_resource:
+ kfree(resource);
+out:
+ return ~0;
+}
+
+static acpi_status __devinit resource_to_window(struct acpi_resource *resource,
+ struct acpi_resource_address64 *addr)
+{
+ acpi_status status;
+
+ /*
+ * We're only interested in _CRS descriptors that are
+ * - address space descriptors for memory or I/O space
+ * - non-zero size
+ * - producers, i.e., the address space is routed downstream,
+ * not consumed by the bridge itself
+ */
+ status = acpi_resource_to_address64(resource, addr);
+ if (ACPI_SUCCESS(status) &&
+ (addr->resource_type == ACPI_MEMORY_RANGE ||
+ addr->resource_type == ACPI_IO_RANGE) &&
+ addr->address_length &&
+ addr->producer_consumer == ACPI_PRODUCER)
+ return AE_OK;
+
+ return AE_ERROR;