Provide a function to append a device_path to a list of device paths
that is separated by final end nodes.
Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com>
---
include/efi_loader.h | 3 +++
lib/efi_loader/efi_device_path.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+)
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 9600941aa32..a7d7b8324f1 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -944,6 +944,9 @@ struct efi_load_option {
struct efi_device_path *efi_dp_from_lo(struct efi_load_option *lo,
const efi_guid_t *guid);
+struct efi_device_path *efi_dp_merge(const struct efi_device_path *dp1,
+ efi_uintn_t *size,
+ const struct efi_device_path *dp2);
struct efi_device_path *efi_dp_concat(const struct efi_device_path *dp1,
const struct efi_device_path *dp2,
bool split_end_node);
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 46aa59b9e40..16cbe41d32f 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -270,6 +270,37 @@ struct efi_device_path *efi_dp_dup(const struct
efi_device_path *dp)
return ndp;
}
+/**
+ * efi_dp_merge() - Concatenate two device paths separated by final end node
+ *
+ * @dp1: first device path
+ * @size: pointer to length of @dp1, total size on return
+ * @dp2: second device path
+ *
+ * Return: concatenated device path or NULL
+ */
+struct efi_device_path *efi_dp_merge(const struct efi_device_path *dp1,
+ efi_uintn_t *size,
+ const struct efi_device_path *dp2)
+{
+ efi_uintn_t len, len1, len2;
+ struct efi_device_path *dp;
+ u8 *p;
+
+ len1 = *size;
+ len2 = efi_dp_size(dp2) + sizeof(END);
+ len = len1 + len2;
+ dp = efi_alloc(len);
+ if (!dp)
+ return NULL;
+ memcpy(dp, dp1, len1);
+ p = (u8 *)dp + len1;
+ memcpy(p, dp2, len2);
+ *size = len;
+
+ return dp;
+}
+
/**
* efi_dp_concat() - Concatenate two device paths and add and terminate them
* with an end node.
--
2.43.0
