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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Vladimir Serbinenko <phcoder@gmail.com>
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Date: Fri, 28 Feb 2014 10:07:11 +0100
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Subject: [PATCH] * grub-core/kern/i386/pc/mmap.c: Fallback to EISA memory map
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if E820 failed to return any regions.
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---
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grub-core/kern/i386/pc/mmap.c | 40 +++++++++++++++++++++-------------------
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ChangeLog | 5 +++++
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2 files changed, 26 insertions(+), 19 deletions(-)
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diff --git a/grub-core/kern/i386/pc/mmap.c b/grub-core/kern/i386/pc/mmap.c
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index 8009e833c1a..f1375f3e12d 100644
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--- a/grub-core/kern/i386/pc/mmap.c
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+++ b/grub-core/kern/i386/pc/mmap.c
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@@ -141,33 +141,35 @@ grub_get_mmap_entry (struct grub_machine_mmap_entry *entry,
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grub_err_t
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grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
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{
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- grub_uint32_t cont;
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+ grub_uint32_t cont = 0;
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struct grub_machine_mmap_entry *entry
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= (struct grub_machine_mmap_entry *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
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+ int e820_works = 0;
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- grub_memset (entry, 0, sizeof (entry));
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+ while (1)
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+ {
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+ grub_memset (entry, 0, sizeof (entry));
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- /* Check if grub_get_mmap_entry works. */
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- cont = grub_get_mmap_entry (entry, 0);
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+ cont = grub_get_mmap_entry (entry, cont);
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- if (entry->size)
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- do
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- {
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- if (hook (entry->addr, entry->len,
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- /* GRUB mmaps have been defined to match with the E820 definition.
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- Therefore, we can just pass type through. */
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- entry->type, hook_data))
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- break;
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+ if (!entry->size)
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+ break;
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- if (! cont)
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- break;
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+ if (entry->len)
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+ e820_works = 1;
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+ if (entry->len
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+ && hook (entry->addr, entry->len,
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+ /* GRUB mmaps have been defined to match with
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+ the E820 definition.
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+ Therefore, we can just pass type through. */
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+ entry->type, hook_data))
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+ break;
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- grub_memset (entry, 0, sizeof (entry));
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+ if (! cont)
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+ break;
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+ }
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- cont = grub_get_mmap_entry (entry, cont);
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- }
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- while (entry->size);
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- else
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+ if (!e820_works)
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{
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grub_uint32_t eisa_mmap = grub_get_eisa_mmap ();
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diff --git a/ChangeLog b/ChangeLog
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index 6ed6cf4ec2b..97cf57e253d 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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+2014-02-28 Vladimir Serbinenko <phcoder@gmail.com>
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+
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+ * grub-core/kern/i386/pc/mmap.c: Fallback to EISA memory map
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+ if E820 failed to return any regions.
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+
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2014-02-28 Vladimir Serbinenko <phcoder@gmail.com>
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* grub-core/mmap/i386/uppermem.c (lower_hook) [COREBOOT]: Ignore low
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