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Optimiza assembly in the previous r185779, to save whooping 16 bytes.

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Submitted by:	Christoph Mallon
MFC after:	4 weeks
		(including r185779)
This commit is contained in:
sobomax 2008-12-08 23:45:41 +00:00
parent 592295f8b7
commit 3a6ba7bd63
1 changed files with 5 additions and 9 deletions
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14
sys/boot/i386/btx/btxldr/btxldr.S
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@ -67,11 +67,8 @@
* BTX program loader for ELF clients.
*/
start: cld # String ops inc
leal 0x4(%esp,1),%ebx # First argument
testl $OPT_SET(RBX_MUTE),(%ebx) # check for RBX_MUTE
jz nomute
movb $1,muted
nomute:
testl $OPT_SET(RBX_MUTE), 4(%esp) # Check first argument
setnz muted # for RBX_MUTE, set flag
movl $m_logo,%esi # Identify
call putstr # ourselves
movzwl BDA_MEM,%eax # Get base memory
@ -296,9 +293,8 @@ putstr: lodsb # Load char
/*
* Output character AL to the console.
*/
putchr: testb $1,muted
jz putchr_nm
ret
putchr: testb $1,muted # Check muted
jnz putchr.5 # do a nop
putchr_nm: pusha # Save
xorl %ecx,%ecx # Zero for loops
movb $SCR_MAT,%ah # Mode/attribute
@ -336,7 +332,7 @@ putchr.3: cmpb $SCR_ROW,%dh # Beyond screen?
movb $SCR_ROW-1,%dh # Bottom line
putchr.4: movw %dx,(%ebx) # Update position
popa # Restore
ret # To caller
putchr.5: ret # To caller
/*
* Convert EAX, AX, or AL to hex, saving the result to [EDI].
*/