Commit c6e052f0 authored Nov 29, 2012 by Paolo Bonzini Committed by Anthony Liguori Nov 30, 2012

multiboot: fix e801 memory map



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>

parent fe512d65

pc-bios/multiboot.bin

(1 KiB)

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pc-bios/optionrom/multiboot.S

+7 −0

Original line number	Diff line number	Diff line
		@@ -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