svn commit: r346881 - head/stand/efi/loader

[Warner Losh]

Author: imp
Date: Mon Apr 29 05:02:54 2019
New Revision: 346881
URL: https://svnweb.freebsd.org/changeset/base/346881

Log:
  Implement uefi_ignore_boot_mgr env variable.
  
  When set, we ignore all the hints that the UEFI boot manager has set
  for us. We also always fail back to the OK prompt when we can't find
  the right thing to boot rather than failing back to the UEFI boot
  manager. This has the side effect of also expanding the cases where we
  fail back to the OK prompt to include when we're booted under UEFI,
  but UEFI::BootCurrent isn't set in the environment and we can't find a
  proper place to boot from.
  
  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 05:02:50 2019	(r346880)
+++ head/stand/efi/loader/main.c	Mon Apr 29 05:02:54 2019	(r346881)
@@ -1027,36 +1027,41 @@ main(int argc, CHAR16 *argv[])
 		}
 	}
 
-	uefi_boot_mgr = true;
-	boot_current = 0;
-	sz = sizeof(boot_current);
-	rv = efi_global_getenv("BootCurrent", &boot_current, &sz);
-	if (rv == EFI_SUCCESS)
-		printf("   BootCurrent: %04x\n", boot_current);
-	else {
-		boot_current = 0xffff;
+	if (getenv("uefi_ignore_boot_mgr") != NULL) {
+		printf("    Ignoring UEFI boot manager\n");
 		uefi_boot_mgr = false;
-	}
+	} else {
+		uefi_boot_mgr = true;
+		boot_current = 0;
+		sz = sizeof(boot_current);
+		rv = efi_global_getenv("BootCurrent", &boot_current, &sz);
+		if (rv == EFI_SUCCESS)
+			printf("   BootCurrent: %04x\n", boot_current);
+		else {
+			boot_current = 0xffff;
+			uefi_boot_mgr = false;
+		}
 
-	sz = sizeof(boot_order);
-	rv = efi_global_getenv("BootOrder", &boot_order, &sz);
-	if (rv == EFI_SUCCESS) {
-		printf("   BootOrder:");
-		for (i = 0; i < sz / sizeof(boot_order[0]); i++)
-			printf(" %04x%s", boot_order[i],
-			    boot_order[i] == boot_current ? "[*]" : "");
-		printf("\n");
-		is_last = boot_order[(sz / sizeof(boot_order[0])) - 1] == boot_current;
-		bosz = sz;
-	} else if (uefi_boot_mgr) {
-		/*
-		 * u-boot doesn't set BootOrder, but otherwise participates in the
-		 * boot manager protocol. So we fake it here and don't consider it
-		 * a failure.
-		 */
-		bosz = sizeof(boot_order[0]);
-		boot_order[0] = boot_current;
-		is_last = true;
+		sz = sizeof(boot_order);
+		rv = efi_global_getenv("BootOrder", &boot_order, &sz);
+		if (rv == EFI_SUCCESS) {
+			printf("   BootOrder:");
+			for (i = 0; i < sz / sizeof(boot_order[0]); i++)
+				printf(" %04x%s", boot_order[i],
+				    boot_order[i] == boot_current ? "[*]" : "");
+			printf("\n");
+			is_last = boot_order[(sz / sizeof(boot_order[0])) - 1] == boot_current;
+			bosz = sz;
+		} else if (uefi_boot_mgr) {
+			/*
+			 * u-boot doesn't set BootOrder, but otherwise participates in the
+			 * boot manager protocol. So we fake it here and don't consider it
+			 * a failure.
+			 */
+			bosz = sizeof(boot_order[0]);
+			boot_order[0] = boot_current;
+			is_last = true;
+		}
 	}
 
 	/*
@@ -1105,7 +1110,8 @@ main(int argc, CHAR16 *argv[])
 	 * to try something different.
 	 */
 	if (find_currdev(uefi_boot_mgr, is_last, boot_info, bisz) != 0)
-		if (!interactive_interrupt("Failed to find bootable partition"))
+		if (uefi_boot_mgr &&
+		    !interactive_interrupt("Failed to find bootable partition"))
 			return (EFI_NOT_FOUND);
 
 	efi_init_environment();