path: root/pc-bios/optionrom
diff options
authorPaolo Bonzini <pbonzini@redhat.com>2012-11-29 18:11:50 +0100
committerAnthony Liguori <aliguori@us.ibm.com>2012-11-30 08:27:47 -0600
commitc6e052f0809b56a657b2afcd728e07ffddb28f06 (patch)
tree9264399c00d2c4e3fe79b1b60f5af98a1f7a7720 /pc-bios/optionrom
parentfe512d65e0b752dfa7af6cfb374a0820d35040d0 (diff)
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>
Diffstat (limited to 'pc-bios/optionrom')
1 files changed, 7 insertions, 0 deletions
diff --git a/pc-bios/optionrom/multiboot.S b/pc-bios/optionrom/multiboot.S
index f08222a3c6..003bcfb49f 100644
--- a/pc-bios/optionrom/multiboot.S
+++ b/pc-bios/optionrom/multiboot.S
@@ -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