Author: imp
Date: Mon May  6 18:38:46 2019
New Revision: 347193
URL: https://svnweb.freebsd.org/changeset/base/347193

Log:
  Reach over and pull in devpath.c from libefi
  
  This allows us to remove three nearly identical functions because the
  differences don't matter, and the size difference is trivial.

Modified:
  head/stand/efi/boot1/Makefile
  head/stand/efi/boot1/boot1.c

Modified: head/stand/efi/boot1/boot1.c
==============================================================================
--- head/stand/efi/boot1/boot1.c	Mon May  6 18:24:07 2019	(r347192)
+++ head/stand/efi/boot1/boot1.c	Mon May  6 18:38:46 2019	(r347193)
@@ -79,6 +79,53 @@ Free(void *buf, const char *file __unused, int line __
 }
 
 /*
+ * nodes_match returns TRUE if the imgpath isn't NULL and the nodes match,
+ * FALSE otherwise.
+ */
+static BOOLEAN
+nodes_match(EFI_DEVICE_PATH *imgpath, EFI_DEVICE_PATH *devpath)
+{
+	size_t len;
+
+	if (imgpath == NULL || imgpath->Type != devpath->Type ||
+	    imgpath->SubType != devpath->SubType)
+		return (FALSE);
+
+	len = DevicePathNodeLength(imgpath);
+	if (len != DevicePathNodeLength(devpath))
+		return (FALSE);
+
+	return (memcmp(imgpath, devpath, (size_t)len) == 0);
+}
+
+/*
+ * device_paths_match returns TRUE if the imgpath isn't NULL and all nodes
+ * in imgpath and devpath match up to their respective occurrences of a
+ * media node, FALSE otherwise.
+ */
+static BOOLEAN
+device_paths_match(EFI_DEVICE_PATH *imgpath, EFI_DEVICE_PATH *devpath)
+{
+
+	if (imgpath == NULL)
+		return (FALSE);
+
+	while (!IsDevicePathEnd(imgpath) && !IsDevicePathEnd(devpath)) {
+		if (IsDevicePathType(imgpath, MEDIA_DEVICE_PATH) &&
+		    IsDevicePathType(devpath, MEDIA_DEVICE_PATH))
+			return (TRUE);
+
+		if (!nodes_match(imgpath, devpath))
+			return (FALSE);
+
+		imgpath = NextDevicePathNode(imgpath);
+		devpath = NextDevicePathNode(devpath);
+	}
+
+	return (FALSE);
+}
+
+/*
  * load_loader attempts to load the loader image data.
  *
  * It tries each module and its respective devices, identified by mod->probe,
@@ -261,7 +308,7 @@ probe_handle(EFI_HANDLE h, EFI_DEVICE_PATH *imgpath, B
 	if (!blkio->Media->LogicalPartition)
 		return (EFI_UNSUPPORTED);
 
-	*preferred = efi_devpath_match(imgpath, devpath);
+	*preferred = device_paths_match(imgpath, devpath);
 
 	/* Run through each module, see if it can load this partition */
 	for (i = 0; i < NUM_BOOT_MODULES; i++) {