Author: imp
Date: Mon Apr 29 05:02:50 2019
New Revision: 346880
URL: https://svnweb.freebsd.org/changeset/base/346880

Log:
  Implement uefi_rootdev
  
  If uefi_rootdev is set in the environment, then treat it like a device
  path. Convert the string to a device path and see if we can find a
  device that matches. If so, use that device at our root dev no matter
  what. If it's bad in any way, the boot will fail.
  
  Reviewed by: bcran
  Differential Revision: https://reviews.freebsd.org/D20016

Modified:
  head/stand/efi/loader/main.c

Modified: head/stand/efi/loader/main.c
==============================================================================
--- head/stand/efi/loader/main.c        Mon Apr 29 05:02:25 2019        
(r346879)
+++ head/stand/efi/loader/main.c        Mon Apr 29 05:02:50 2019        
(r346880)
@@ -472,13 +472,35 @@ find_currdev(bool do_bootmgr, bool is_last,
         */
        rootdev = getenv("rootdev");
        if (rootdev != NULL) {
-               printf("Setting currdev to configured rootdev %s\n", rootdev);
+               printf("    Setting currdev to configured rootdev %s\n",
+                   rootdev);
                set_currdev(rootdev);
                return (0);
        }
 
        /*
-        * Second choice: If we can find out image boot_info, and there's
+        * Second choice: If uefi_rootdev is set, translate that UEFI device
+        * path to the loader's internal name and use that.
+        */
+       do {
+               rootdev = getenv("uefi_rootdev");
+               if (rootdev == NULL)
+                       break;
+               devpath = efi_name_to_devpath(rootdev);
+               if (devpath == NULL)
+                       break;
+               dp = efiblk_get_pdinfo_by_device_path(devpath);
+               efi_devpath_free(devpath);
+               if (dp == NULL)
+                       break;
+               printf("    Setting currdev to UEFI path %s\n",
+                   rootdev);
+               set_currdev_pdinfo(dp);
+               return (0);
+       } while (0);
+
+       /*
+        * Third choice: If we can find out image boot_info, and there's
         * a follow-on boot image in that boot_info, use that. In this
         * case root will be the partition specified in that image and
         * we'll load the kernel specified by the file path. Should there
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