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multiboot: fix e801 memory map

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The e801 memory sizes in the multiboot structures hard-code the available
low memory to 640.  However, the value should not include the size of the
EBDA.  Fill the value in the option ROM, getting the size of low memory
from the BIOS.

Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-11-29 18:11:50 +01:00 committed by Anthony Liguori
parent fe512d65e0
commit c6e052f080
2 changed files with 7 additions and 0 deletions
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pc-bios/multiboot.bin
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7
pc-bios/optionrom/multiboot.S
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@ -75,6 +75,13 @@ run_multiboot:
shr $4, %eax
mov %ax, %fs
/* Account for the EBDA in the multiboot structure's e801
* map.
*/
int $0x12
cwtl
movl %eax, %fs:4
/* ES = mmap_addr */
mov %fs:48, %eax
shr $4, %eax