Author: dim
Date: Thu Nov 8 23:21:02 2012
New Revision: 242804
URL: http://svnweb.freebsd.org/changeset/base/242804
Log:
Shrink boot2 by 8 bytes, by eliminating some unneeded instructions in
sio.S. This is not particularly needed for head right now, but it is
intended to merge to stable/9, to fix boot2 build with clang there.
Reviewed by: avg
MFC after: 3 days
Modified:
head/sys/boot/i386/boot2/sio.S
Modified: head/sys/boot/i386/boot2/sio.S
==============================================================================
--- head/sys/boot/i386/boot2/sio.S Thu Nov 8 23:11:59 2012
(r242803)
+++ head/sys/boot/i386/boot2/sio.S Thu Nov 8 23:21:02 2012
(r242804)
@@ -40,13 +40,11 @@ sio_init: pushl %eax
movb $0x3,%al # Set RTS,
outb %al,(%dx) # DTR
incl %edx # Line status reg
- call sio_flush
- ret
+ # Fallthrough
/* int sio_flush(void) */
-sio_flush: xorl %eax,%eax # Return value
- xorl %ecx,%ecx # Timeout
+sio_flush: xorl %ecx,%ecx # Timeout
movb $0x80,%ch # counter
sio_flush.1: call sio_ischar # Check for character
jz sio_flush.2 # Till none
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