On 9/27/18 6:41 AM, xypr...@archlinux.org wrote: > From: Alexander F. Rødseth <xypr...@archlinux.org> > > Only ah needs to be set to 0 before calling interrupt 0x16 for waiting > for a keypress. > > This patch changes the line that uses xor so that it only zeroes "ah" instead > of "ax". > This saves a byte. > > Signed-off-by: Alexander F. Rødseth <xypr...@archlinux.org>
Hi, You should Cc: the X86 maintainers on this patch. Otherwise it will just be lost in the ether. thanks. > --- > arch/x86/boot/header.S | 11 ++++++----- > 1 file changed, 6 insertions(+), 5 deletions(-) > > diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S > index 850b8762e889..905cb96f43d4 100644 > --- a/arch/x86/boot/header.S > +++ b/arch/x86/boot/header.S > @@ -71,14 +71,15 @@ msg_loop: > jmp msg_loop > > bs_die: > - # Allow the user to press a key, then reboot > - xorw %ax, %ax > + # Allow the user to press a key > + xorb %ah, %ah > int $0x16 > + > + # Boostrap by reading sector 1, head 0, track 0 from drive > int $0x19 > > - # int 0x19 should never return. In case it does anyway, > - # invoke the BIOS reset code... > - ljmp $0xf000,$0xfff0 > + # If boostrap somehow did not work, invoke the BIOS reset code > + ljmp $0xf000, $0xfff0 > > #ifdef CONFIG_EFI_STUB > .org 0x3c > -- ~Randy
