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Synchronize with sys/i386/boot/biosboot/serial.S revision 1.9.

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This commit is contained in:
KATO Takenori 1997-07-14 12:34:01 +00:00
parent c39114cfcf
commit 6e4f1ea7d6
1 changed files with 15 additions and 30 deletions
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45
sys/pc98/boot/biosboot/serial.S
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@ -24,7 +24,7 @@
* the rights to redistribute these changes.
*
* from: Mach, Revision 2.2 92/04/04 11:34:26 rpd
* $Id: serial.S,v 1.4 1997/02/22 09:43:08 peter Exp $
* $Id: serial.S,v 1.5 1997/05/18 12:28:38 kato Exp $
*/
/*
@ -71,12 +71,13 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.file "serial.s"
#include "asm.h"
#ifdef PC98
#include "../../pc98/sioreg.h"
#include <pc98/pc98/sioreg.h>
#else
#include "../../isa/sioreg.h"
#include <i386/isa/sioreg.h>
#endif
#include "asm.h"
.text
/*
@ -99,20 +100,16 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
ENTRY(serial_putc)
push %ebp
mov %esp, %ebp
mov $COMCONSOLE + 2, %edx # line status reg
1: inb %dx, %al
test $0x01, %al
testb $0x01, %al
jz 1b # TX buffer not empty
movb 0x8(%ebp), %al
movb 0x4(%esp), %al
sub $2, %edx # TX output reg
outb %al, %dx # send this one
pop %ebp
ret
/*
@ -121,24 +118,20 @@ ENTRY(serial_putc)
*/
ENTRY(serial_getc)
push %ebp
mov %esp, %ebp
mov $COMCONSOLE + 2, %edx # line status reg
1:
inb %dx, %al
testb $0x02, %al
jz 1b # no RX char available
xor %eax, %eax
sub $2, %edx # RX buffer reg
xorb %eax, %eax
subb $2, %edx # RX buffer reg
inb %dx, %al # fetch (first) character
cmp $0x7F, %eax # make DEL...
jne 2f
mov $0x08, %eax # look like BS
movb $0x08, %eax # look like BS
2:
pop %ebp
ret
/*
@ -146,15 +139,11 @@ ENTRY(serial_getc)
* if there is a character pending, return true; otherwise return 0
*/
ENTRY(serial_ischar)
push %ebp
mov %esp, %ebp
xorl %eax, %eax
mov $COMCONSOLE + 2, %edx # line status reg
movl $COMCONSOLE + 2, %edx # line status reg
inb %dx, %al
andb $0x02, %al # RX char available?
pop %ebp
ret
/*
@ -162,9 +151,6 @@ ENTRY(serial_ischar)
* initialize the serial console port to 9600 Bd, 8 bpc
*/
ENTRY(init_serial)
push %ebp
mov %esp, %ebp
/* set 8253 */
movb 0xb6, %al
outb %al, $0x77
@ -187,14 +173,14 @@ ENTRY(init_serial)
outb %al, $0x02
/* dummy command */
xor %al,%al
mov $COMCONSOLE + 2, %edx
xorb %al,%al
movl $COMCONSOLE + 2, %edx
outb %al, %dx
inb $0x5f, %al
xor %al,%al
xorb %al,%al
outb %al, %dx
inb $0x5f, %al
xor %al,%al
xorb %al,%al
outb %al, %dx
inb $0x5f, %al
@ -212,5 +198,4 @@ ENTRY(init_serial)
movb $0x37, %al
outb %al, %dx
pop %ebp
ret