grub2/0087-efi-Move-grub_reboot-into-kernel.patch

From 0ba90a7f017889d32a47897d9107ef45cc50a049 Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Thu, 31 Aug 2017 16:40:18 +0200
Subject: [PATCH] efi: Move grub_reboot() into kernel

The reboot function calls machine_fini() and then reboots the system.
Currently it lives in lib/ which means it gets compiled into the
reboot module which lives on the heap.

In a following patch, I want to free the heap on machine_fini()
though, so we would free the memory that the code is running in. That
obviously breaks with smarter UEFI implementations.

So this patch moves it into the core. That way we ensure that all
code running after machine_fini() in the UEFI case is running from
memory that got allocated (and gets deallocated) by the UEFI core.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/Makefile.core.def |  4 ----
 grub-core/kern/efi/efi.c    |  9 +++++++++
 grub-core/lib/efi/reboot.c  | 33 ---------------------------------
 include/grub/misc.h         |  3 ++-
 4 files changed, 11 insertions(+), 38 deletions(-)
 delete mode 100644 grub-core/lib/efi/reboot.c

diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index d90ad622082..2c1d62ceea9 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -872,10 +872,6 @@ module = {
   name = reboot;
   i386 = lib/i386/reboot.c;
   i386 = lib/i386/reboot_trampoline.S;
-  ia64_efi = lib/efi/reboot.c;
-  x86_64_efi = lib/efi/reboot.c;
-  arm_efi = lib/efi/reboot.c;
-  arm64_efi = lib/efi/reboot.c;
   powerpc_ieee1275 = lib/ieee1275/reboot.c;
   sparc64_ieee1275 = lib/ieee1275/reboot.c;
   mips_arc = lib/mips/arc/reboot.c;
diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index d467785fc6c..708581fcbde 100644
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -154,6 +154,15 @@ grub_efi_get_loaded_image (grub_efi_handle_t image_handle)
 				 GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL);
 }
 
+void
+grub_reboot (void)
+{
+  grub_machine_fini (GRUB_LOADER_FLAG_NORETURN);
+  efi_call_4 (grub_efi_system_table->runtime_services->reset_system,
+              GRUB_EFI_RESET_COLD, GRUB_EFI_SUCCESS, 0, NULL);
+  for (;;) ;
+}
+
 void
 grub_exit (void)
 {
diff --git a/grub-core/lib/efi/reboot.c b/grub-core/lib/efi/reboot.c
deleted file mode 100644
index 7de8bcb5d6e..00000000000
--- a/grub-core/lib/efi/reboot.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- *  GRUB  --  GRand Unified Bootloader
- *  Copyright (C) 2011  Free Software Foundation, Inc.
- *
- *  GRUB is free software: you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
- *  (at your option) any later version.
- *
- *  GRUB is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <grub/efi/api.h>
-#include <grub/efi/efi.h>
-#include <grub/mm.h>
-#include <grub/misc.h>
-#include <grub/kernel.h>
-#include <grub/loader.h>
-
-void
-grub_reboot (void)
-{
-  grub_machine_fini (GRUB_LOADER_FLAG_NORETURN);
-  efi_call_4 (grub_efi_system_table->runtime_services->reset_system,
-              GRUB_EFI_RESET_COLD, GRUB_EFI_SUCCESS, 0, NULL);
-  for (;;) ;
-}
diff --git a/include/grub/misc.h b/include/grub/misc.h
index 2a9f87cc255..372f009e84f 100644
--- a/include/grub/misc.h
+++ b/include/grub/misc.h
@@ -396,7 +396,8 @@ grub_abs (int x)
 }
 
 /* Reboot the machine.  */
-#if defined (GRUB_MACHINE_EMU) || defined (GRUB_MACHINE_QEMU_MIPS)
+#if defined (GRUB_MACHINE_EMU) || defined (GRUB_MACHINE_QEMU_MIPS) || \
+    defined (GRUB_MACHINE_EFI)
 void EXPORT_FUNC(grub_reboot) (void) __attribute__ ((noreturn));
 #else
 void grub_reboot (void) __attribute__ ((noreturn));