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From 5804ce3d46ef5792ea4aa53e1460c341137961e9 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Thu, 25 Jun 2015 11:59:09 -0400
Subject: [PATCH 2/6] Make efi machines load an env block from a variable

Signed-off-by: Peter Jones <pjones@redhat.com>
---
 grub-core/Makefile.core.def |  1 +
 grub-core/kern/efi/init.c   | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 38291ce..b3ba5ed 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -174,6 +174,7 @@ kernel = {
   efi = kern/efi/init.c;
   efi = kern/efi/mm.c;
   efi = term/efi/console.c;
+  efi = lib/envblk.c;
 
   x86 = kern/i386/tsc.c;
 
diff --git a/grub-core/kern/efi/init.c b/grub-core/kern/efi/init.c
index e9c85de..d17d18e 100644
--- a/grub-core/kern/efi/init.c
+++ b/grub-core/kern/efi/init.c
@@ -25,9 +25,40 @@
 #include <grub/env.h>
 #include <grub/mm.h>
 #include <grub/kernel.h>
+#include <grub/lib/envblk.h>
 
 grub_addr_t grub_modbase;
 
+#define GRUB_EFI_GRUB_VARIABLE_GUID \
+  { 0x91376aff, 0xcba6, 0x42be, \
+    { 0x94, 0x9d, 0x06, 0xfd, 0xe8, 0x11, 0x28, 0xe8 } \
+  }
+
+/* Helper for grub_efi_env_init */
+static int
+set_var (const char *name, const char *value,
+	 void *whitelist __attribute__((__unused__)))
+{
+  grub_env_set (name, value);
+  return 0;
+}
+
+static void
+grub_efi_env_init (void)
+{
+  grub_efi_guid_t efi_grub_guid = GRUB_EFI_GRUB_VARIABLE_GUID;
+  struct grub_envblk envblk_s = { NULL, 0 };
+  grub_envblk_t envblk = &envblk_s;
+
+  envblk_s.buf = grub_efi_get_variable ("GRUB_ENV", &efi_grub_guid,
+					&envblk_s.size);
+  if (!envblk_s.buf || envblk_s.size < 1)
+    return;
+
+  grub_envblk_iterate (envblk, NULL, set_var);
+  grub_free (envblk_s.buf);
+}
+
 void
 grub_efi_init (void)
 {
@@ -42,6 +73,7 @@ grub_efi_init (void)
   efi_call_4 (grub_efi_system_table->boot_services->set_watchdog_timer,
 	      0, 0, 0, NULL);
 
+  grub_efi_env_init ();
   grub_efidisk_init ();
 }
 
-- 
2.4.3