From 42c1756fd0ff7d94dcc8e9be2e429a2a976f6d41 Mon Sep 17 00:00:00 2001
From: Piotr Krysiuk <piotras@gmail.com>
Date: Sun, 20 Apr 2014 15:58:45 +0200
Subject: [PATCH 079/152] Allow loading old kernels by placing GDT in
conventional memory.
---
ChangeLog | 5 +++++
grub-core/lib/i386/relocator.c | 11 +++++++----
2 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 3556468..73a8928 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-04-20 Piotr Krysiuk <piotras@gmail.com>
+
+ * grub-core/lib/i386/relocator.c: Allow loading old kernels by placing
+ GDT in conventional memory.
+
2014-04-10 Colin Watson <cjwatson@ubuntu.com>
* util/grub.d/30_os-prober.in: Tolerate devices with no filesystem
diff --git a/grub-core/lib/i386/relocator.c b/grub-core/lib/i386/relocator.c
index d2a1b27..ffaf25f 100644
--- a/grub-core/lib/i386/relocator.c
+++ b/grub-core/lib/i386/relocator.c
@@ -81,10 +81,13 @@ grub_relocator32_boot (struct grub_relocator *rel,
void *relst;
grub_relocator_chunk_t ch;
- err = grub_relocator_alloc_chunk_align (rel, &ch, 0,
- (0xffffffff - RELOCATOR_SIZEOF (32))
- + 1, RELOCATOR_SIZEOF (32), 16,
- GRUB_RELOCATOR_PREFERENCE_NONE,
+ /* Specific memory range due to Global Descriptor Table for use by payload
+ that we will store in returned chunk. The address range and preference
+ are based on "THE LINUX/x86 BOOT PROTOCOL" specification. */
+ err = grub_relocator_alloc_chunk_align (rel, &ch, 0x1000,
+ 0x9a000 - RELOCATOR_SIZEOF (32),
+ RELOCATOR_SIZEOF (32), 16,
+ GRUB_RELOCATOR_PREFERENCE_LOW,
avoid_efi_bootservices);
if (err)
return err;
--
1.9.3