grub2/0064-grub-core-kern-i386-pc-mmap.c-Fallback-to-EISA-memor.patch

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From 37e3b5e42930e8cd4e801e4203dc2fde335b4b10 Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Fri, 28 Feb 2014 10:07:11 +0100
Subject: [PATCH 064/125] * grub-core/kern/i386/pc/mmap.c: Fallback to
EISA memory map if E820 failed to return any regions.
---
ChangeLog | 5 +++++
grub-core/kern/i386/pc/mmap.c | 40 +++++++++++++++++++++-------------------
2 files changed, 26 insertions(+), 19 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 6ed6cf4..97cf57e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
2014-02-28 Vladimir Serbinenko <phcoder@gmail.com>
+ * grub-core/kern/i386/pc/mmap.c: Fallback to EISA memory map
+ if E820 failed to return any regions.
+
+2014-02-28 Vladimir Serbinenko <phcoder@gmail.com>
+
* grub-core/mmap/i386/uppermem.c (lower_hook) [COREBOOT]: Ignore low
tables for low memory calculations.
diff --git a/grub-core/kern/i386/pc/mmap.c b/grub-core/kern/i386/pc/mmap.c
index 8009e83..f1375f3 100644
--- a/grub-core/kern/i386/pc/mmap.c
+++ b/grub-core/kern/i386/pc/mmap.c
@@ -141,33 +141,35 @@ grub_get_mmap_entry (struct grub_machine_mmap_entry *entry,
grub_err_t
grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
{
- grub_uint32_t cont;
+ grub_uint32_t cont = 0;
struct grub_machine_mmap_entry *entry
= (struct grub_machine_mmap_entry *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
+ int e820_works = 0;
- grub_memset (entry, 0, sizeof (entry));
+ while (1)
+ {
+ grub_memset (entry, 0, sizeof (entry));
- /* Check if grub_get_mmap_entry works. */
- cont = grub_get_mmap_entry (entry, 0);
+ cont = grub_get_mmap_entry (entry, cont);
- if (entry->size)
- do
- {
- if (hook (entry->addr, entry->len,
- /* GRUB mmaps have been defined to match with the E820 definition.
- Therefore, we can just pass type through. */
- entry->type, hook_data))
- break;
+ if (!entry->size)
+ break;
- if (! cont)
- break;
+ if (entry->len)
+ e820_works = 1;
+ if (entry->len
+ && hook (entry->addr, entry->len,
+ /* GRUB mmaps have been defined to match with
+ the E820 definition.
+ Therefore, we can just pass type through. */
+ entry->type, hook_data))
+ break;
- grub_memset (entry, 0, sizeof (entry));
+ if (! cont)
+ break;
+ }
- cont = grub_get_mmap_entry (entry, cont);
- }
- while (entry->size);
- else
+ if (!e820_works)
{
grub_uint32_t eisa_mmap = grub_get_eisa_mmap ();
--
1.9.0