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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Piotr Krysiuk <piotras@gmail.com>
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Date: Sun, 20 Apr 2014 15:58:45 +0200
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Subject: [PATCH] Allow loading old kernels by placing GDT in conventional
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memory.
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---
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grub-core/lib/i386/relocator.c | 11 +++++++----
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ChangeLog | 5 +++++
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2 files changed, 12 insertions(+), 4 deletions(-)
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diff --git a/grub-core/lib/i386/relocator.c b/grub-core/lib/i386/relocator.c
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index d2a1b27ae0e..ffaf25f088d 100644
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--- a/grub-core/lib/i386/relocator.c
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+++ b/grub-core/lib/i386/relocator.c
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@@ -81,10 +81,13 @@ grub_relocator32_boot (struct grub_relocator *rel,
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void *relst;
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grub_relocator_chunk_t ch;
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- err = grub_relocator_alloc_chunk_align (rel, &ch, 0,
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- (0xffffffff - RELOCATOR_SIZEOF (32))
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- + 1, RELOCATOR_SIZEOF (32), 16,
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- GRUB_RELOCATOR_PREFERENCE_NONE,
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+ /* Specific memory range due to Global Descriptor Table for use by payload
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+ that we will store in returned chunk. The address range and preference
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+ are based on "THE LINUX/x86 BOOT PROTOCOL" specification. */
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+ err = grub_relocator_alloc_chunk_align (rel, &ch, 0x1000,
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+ 0x9a000 - RELOCATOR_SIZEOF (32),
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+ RELOCATOR_SIZEOF (32), 16,
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+ GRUB_RELOCATOR_PREFERENCE_LOW,
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avoid_efi_bootservices);
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if (err)
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return err;
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diff --git a/ChangeLog b/ChangeLog
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index 35564681a4d..73a89289945 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,3 +1,8 @@
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+2014-04-20 Piotr Krysiuk <piotras@gmail.com>
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+
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+ * grub-core/lib/i386/relocator.c: Allow loading old kernels by placing
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+ GDT in conventional memory.
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+
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2014-04-10 Colin Watson <cjwatson@ubuntu.com>
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* util/grub.d/30_os-prober.in: Tolerate devices with no filesystem
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