+// SPDX-License-Identifier: GPL-2.0+
/*
* EFI device path from u-boot device-model mapping
*
* (C) Copyright 2017 Rob Clark
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#define LOG_CATEGORY LOGL_ERR
#include <usb.h>
#include <mmc.h>
#include <efi_loader.h>
-#include <inttypes.h>
#include <part.h>
/* template END node: */
.length = sizeof(END),
};
-#define U_BOOT_GUID \
- EFI_GUID(0xe61d73b9, 0xa384, 0x4acc, \
- 0xae, 0xab, 0x82, 0xe8, 0x28, 0xf3, 0x62, 0x8b)
-
/* template ROOT node: */
static const struct efi_device_path_vendor ROOT = {
.dp = {
/*
* Compare two device-paths, stopping when the shorter of the two hits
- * an End* node. This is useful to, for example, compare a device-path
+ * an End* node. This is useful to, for example, compare a device-path
* representing a device with one representing a file on the device, or
* a device with a parent device.
*/
}
/*
- * See UEFI spec (section 3.1.2, about short-form device-paths..
- * tl;dr: we can have a device-path that starts with a USB WWID
- * or USB Class node, and a few other cases which don't encode
- * the full device path with bus hierarchy:
+ * We can have device paths that start with a USB WWID or a USB Class node,
+ * and a few other cases which don't encode the full device path with bus
+ * hierarchy:
*
* - MESSAGING:USB_WWID
* - MESSAGING:USB_CLASS
* - MEDIA:FILE_PATH
* - MEDIA:HARD_DRIVE
* - MESSAGING:URI
+ *
+ * See UEFI spec (section 3.1.2, about short-form device-paths)
*/
static struct efi_device_path *shorten_path(struct efi_device_path *dp)
{
struct efi_device_path **rem)
{
struct efi_object *efiobj;
- unsigned int dp_size = efi_dp_size(dp);
+ efi_uintn_t dp_size = efi_dp_instance_size(dp);
list_for_each_entry(efiobj, &efi_obj_list, link) {
struct efi_handler *handler;
struct efi_device_path *obj_dp;
efi_status_t ret;
- ret = efi_search_protocol(efiobj->handle,
+ ret = efi_search_protocol(efiobj,
&efi_guid_device_path, &handler);
if (ret != EFI_SUCCESS)
continue;
* the caller.
*/
*rem = ((void *)dp) +
- efi_dp_size(obj_dp);
+ efi_dp_instance_size(obj_dp);
return efiobj;
} else {
/* Only return on exact matches */
- if (efi_dp_size(obj_dp) == dp_size)
+ if (efi_dp_instance_size(obj_dp) ==
+ dp_size)
return efiobj;
}
}
return ret;
}
-/* return size not including End node: */
-unsigned efi_dp_size(const struct efi_device_path *dp)
+/* get size of the first device path instance excluding end node */
+efi_uintn_t efi_dp_instance_size(const struct efi_device_path *dp)
{
- unsigned sz = 0;
+ efi_uintn_t sz = 0;
if (!dp || dp->type == DEVICE_PATH_TYPE_END)
return 0;
return sz;
}
+/* get size of multi-instance device path excluding end node */
+efi_uintn_t efi_dp_size(const struct efi_device_path *dp)
+{
+ const struct efi_device_path *p = dp;
+
+ if (!p)
+ return 0;
+ while (p->type != DEVICE_PATH_TYPE_END ||
+ p->sub_type != DEVICE_PATH_SUB_TYPE_END)
+ p = (void *)p + p->length;
+
+ return (void *)p - (void *)dp;
+}
+
+/* copy multi-instance device path */
struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp)
{
struct efi_device_path *ndp;
- unsigned sz = efi_dp_size(dp) + sizeof(END);
+ size_t sz = efi_dp_size(dp) + sizeof(END);
if (!dp)
return NULL;
} else if (!node) {
ret = efi_dp_dup(dp);
} else if (!dp) {
- unsigned sz = node->length;
+ size_t sz = node->length;
void *p = dp_alloc(sz + sizeof(END));
if (!p)
return NULL;
ret = p;
} else {
/* both dp and node are non-null */
- unsigned sz = efi_dp_size(dp);
+ size_t sz = efi_dp_size(dp);
void *p = dp_alloc(sz + node->length + sizeof(END));
if (!p)
return NULL;
return ret;
}
+struct efi_device_path *efi_dp_append_instance(
+ const struct efi_device_path *dp,
+ const struct efi_device_path *dpi)
+{
+ size_t sz, szi;
+ struct efi_device_path *p, *ret;
+
+ if (!dpi)
+ return NULL;
+ if (!dp)
+ return efi_dp_dup(dpi);
+ sz = efi_dp_size(dp);
+ szi = efi_dp_instance_size(dpi);
+ p = dp_alloc(sz + szi + 2 * sizeof(END));
+ if (!p)
+ return NULL;
+ ret = p;
+ memcpy(p, dp, sz + sizeof(END));
+ p = (void *)p + sz;
+ p->sub_type = DEVICE_PATH_SUB_TYPE_INSTANCE_END;
+ p = (void *)p + sizeof(END);
+ memcpy(p, dpi, szi);
+ p = (void *)p + szi;
+ memcpy(p, &END, sizeof(END));
+ return ret;
+}
+
+struct efi_device_path *efi_dp_get_next_instance(struct efi_device_path **dp,
+ efi_uintn_t *size)
+{
+ size_t sz;
+ struct efi_device_path *p;
+
+ if (size)
+ *size = 0;
+ if (!dp || !*dp)
+ return NULL;
+ sz = efi_dp_instance_size(*dp);
+ p = dp_alloc(sz + sizeof(END));
+ if (!p)
+ return NULL;
+ memcpy(p, *dp, sz + sizeof(END));
+ *dp = (void *)*dp + sz;
+ if ((*dp)->sub_type == DEVICE_PATH_SUB_TYPE_INSTANCE_END)
+ *dp = (void *)*dp + sizeof(END);
+ else
+ *dp = NULL;
+ if (size)
+ *size = sz + sizeof(END);
+ return p;
+}
+
+bool efi_dp_is_multi_instance(const struct efi_device_path *dp)
+{
+ const struct efi_device_path *p = dp;
+
+ if (!p)
+ return false;
+ while (p->type != DEVICE_PATH_TYPE_END)
+ p = (void *)p + p->length;
+ return p->sub_type == DEVICE_PATH_SUB_TYPE_INSTANCE_END;
+}
+
#ifdef CONFIG_DM
/* size of device-path not including END node for device and all parents
* up to the root device.
/*
* Create a device node for a block device partition.
*
- * @buf buffer to which the device path is wirtten
+ * @buf buffer to which the device path is written
* @desc block device descriptor
* @part partition number, 0 identifies a block device
*/
/*
* Create a device path for a block device or one of its partitions.
*
- * @buf buffer to which the device path is wirtten
+ * @buf buffer to which the device path is written
* @desc block device descriptor
* @part partition number, 0 identifies a block device
*/
/*
* We *could* make a more accurate path, by looking at if_type
* and handling all the different cases like we do for non-
- * legacy (ie CONFIG_BLK=y) case. But most important thing
+ * legacy (i.e. CONFIG_BLK=y) case. But most important thing
* is just to have a unique device-path for if_type+devnum.
* So map things to a fictitious USB device.
*/
return dp_part_node(buf, desc, part);
}
-/* Construct a device-path from a partition on a blk device: */
+/* Construct a device-path from a partition on a block device: */
struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part)
{
void *buf, *start;
/*
* Create a device node for a block device partition.
*
- * @buf buffer to which the device path is wirtten
+ * @buf buffer to which the device path is written
* @desc block device descriptor
* @part partition number, 0 identifies a block device
*/
return buf;
}
-/* convert path to an UEFI style path (ie. DOS style backslashes and utf16) */
+/* convert path to an UEFI style path (i.e. DOS style backslashes and UTF-16) */
static void path_to_uefi(u16 *uefi, const char *path)
{
while (*path) {
*file_path = fp;
return EFI_SUCCESS;
}
+
+efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
+ const char *path,
+ struct efi_device_path **device,
+ struct efi_device_path **file)
+{
+ int is_net;
+ struct blk_desc *desc = NULL;
+ disk_partition_t fs_partition;
+ int part = 0;
+ char filename[32] = { 0 }; /* dp->str is u16[32] long */
+ char *s;
+
+ if (path && !file)
+ return EFI_INVALID_PARAMETER;
+
+ is_net = !strcmp(dev, "Net");
+ if (!is_net) {
+ part = blk_get_device_part_str(dev, devnr, &desc, &fs_partition,
+ 1);
+ if (part < 0)
+ return EFI_INVALID_PARAMETER;
+
+ if (device)
+ *device = efi_dp_from_part(desc, part);
+ } else {
+#ifdef CONFIG_NET
+ if (device)
+ *device = efi_dp_from_eth();
+#endif
+ }
+
+ if (!path)
+ return EFI_SUCCESS;
+
+ if (!is_net) {
+ /* Add leading / to fs paths, because they're absolute */
+ snprintf(filename, sizeof(filename), "/%s", path);
+ } else {
+ snprintf(filename, sizeof(filename), "%s", path);
+ }
+ /* DOS style file path: */
+ s = filename;
+ while ((s = strchr(s, '/')))
+ *s++ = '\\';
+ *file = efi_dp_from_file(((!is_net && device) ? desc : NULL),
+ part, filename);
+
+ return EFI_SUCCESS;
+}
projects / platform / kernel / u-boot.git / blobdiff