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Shrink boot2 by 8 bytes, by eliminating some unneeded instructions in

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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
This commit is contained in:
Dimitry Andric 2012-11-08 23:21:02 +00:00
parent bbee93a84e
commit 56eaeab499
1 changed files with 2 additions and 4 deletions
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6
sys/boot/i386/boot2/sio.S
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@ -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