While trying to run -kernel with -bios pc-bios/pcbios.bin, I realized
that I was actually writing data to %es, but only set up %ds to a 32-bit
segment we want to write to.
So at the end of the day the data hasn't actually been copied. Oops.
So here's a fix to set ES instead of DS, which makes -kernel work with
BOCHS bios again (and actually makes the code do the correct thing)!
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
mov $1, %eax
mov %eax, %cr0
- /* So we can set DS to a 32-bit segment */
+ /* So we can set ES to a 32-bit segment */
mov $0x10, %eax
- mov %eax, %ds
+ mov %eax, %es
- /* We're now running in 16-bit CS, but 32-bit DS! */
+ /* We're now running in 16-bit CS, but 32-bit ES! */
/* Load kernel and initrd */
read_fw_blob(FW_CFG_KERNEL)
mov $0, %eax
mov %eax, %cr0
- /* DS = CS */
+ /* ES = CS */
mov %cs, %ax
- mov %ax, %ds
+ mov %ax, %es
jmp boot_kernel