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Removed some useless code:

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- gcc assumes that %ecx and %edx are clobbered (due to calling
  conventions), thus there is no need for saving/restoring those two
  registers.
- %es is reset to default value by real_to_prot, thus there is no need
  for saving/restorig that register.
Submitted by:	tegge
This commit is contained in:
Bruce Evans 1997-05-16 10:40:00 +00:00
parent 43f67e2b2e
commit 906265bada
2 changed files with 2 additions and 24 deletions
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16
sys/i386/boot/biosboot/bios.S
View File

@ -24,7 +24,7 @@
* the rights to redistribute these changes.
*
* from: Mach, Revision 2.2 92/04/04 11:34:26 rpd
* $Id$
* $Id: bios.S,v 1.9 1997/02/22 09:30:05 peter Exp $
*/
/*
@ -77,9 +77,6 @@ ENTRY(biosread)
push %ebx
push %esi
push %edi
push %ecx
push %edx
push %es
movb 0x10(%ebp), %dh
movw 0x0c(%ebp), %cx
@ -111,9 +108,6 @@ ENTRY(biosread)
xor %eax, %eax
movb %bh, %al /* return value in %ax */
pop %es
pop %edx
pop %ecx
pop %edi
pop %esi
pop %ebx
@ -138,7 +132,6 @@ ENTRY(putc)
push %ebx
push %esi
push %edi
push %ecx
movb 0x8(%ebp), %cl
@ -155,7 +148,6 @@ ENTRY(putc)
data32
call EXT(real_to_prot)
pop %ecx
pop %edi
pop %esi
pop %ebx
@ -252,12 +244,9 @@ nochar:
ENTRY(get_diskinfo)
push %ebp
mov %esp, %ebp
push %es
push %ebx
push %esi
push %edi
push %ecx
push %edx
movb 0x8(%ebp), %dl /* diskinfo(drive #) */
call EXT(prot_to_real) /* enter real mode */
@ -306,12 +295,9 @@ ok:
andb $0x3f, %cl /* mask of cylinder gunk */
movb %cl, %al /* max sector (and # sectors) */
pop %edx
pop %ecx
pop %edi
pop %esi
pop %ebx
pop %es
pop %ebp
ret

10
sys/i386/boot/biosboot/serial.S
View File

@ -24,7 +24,7 @@
* the rights to redistribute these changes.
*
* from: Mach, Revision 2.2 92/04/04 11:34:26 rpd
* $Id$
* $Id: serial.S,v 1.6 1997/02/22 09:30:11 peter Exp $
*/
/*
@ -93,7 +93,6 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
ENTRY(serial_putc)
push %ebp
mov %esp, %ebp
push %edx
mov $COMCONSOLE + 5, %edx # line status reg
1: inb %dx, %al
@ -105,7 +104,6 @@ ENTRY(serial_putc)
sub $5, %edx # TX output reg
outb %al, %dx # send this one
pop %edx
pop %ebp
ret
@ -117,7 +115,6 @@ ENTRY(serial_putc)
ENTRY(serial_getc)
push %ebp
mov %esp, %ebp
push %edx
mov $COMCONSOLE + 5, %edx # line status reg
1:
@ -134,7 +131,6 @@ ENTRY(serial_getc)
jne 2f
mov $0x08, %eax # look like BS
2:
pop %edx
pop %ebp
ret
@ -145,14 +141,12 @@ ENTRY(serial_getc)
ENTRY(serial_ischar)
push %ebp
mov %esp, %ebp
push %edx
xorl %eax, %eax
mov $COMCONSOLE + 5, %edx # line status reg
inb %dx, %al
andb $0x01, %al # RX char available?
pop %edx
pop %ebp
ret
@ -163,7 +157,6 @@ ENTRY(serial_ischar)
ENTRY(init_serial)
push %ebp
mov %esp, %ebp
push %edx
mov $COMCONSOLE + 3, %edx # line control reg
movb $0x80, %al
@ -195,6 +188,5 @@ ENTRY(init_serial)
add $5, %edx
jmp 1b
2:
pop %edx
pop %ebp
ret