1/*
2 * Copyright (c) 1998 Robert Nordier
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are freely
6 * permitted provided that the above copyright notice and this
7 * paragraph and the following disclaimer are duplicated in all
8 * such forms.
9 *
10 * This software is provided "AS IS" and without any express or
11 * implied warranties, including, without limitation, the implied
12 * warranties of merchantability and fitness for a particular
13 * purpose.
14 *
| 1/*
2 * Copyright (c) 1998 Robert Nordier
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are freely
6 * permitted provided that the above copyright notice and this
7 * paragraph and the following disclaimer are duplicated in all
8 * such forms.
9 *
10 * This software is provided "AS IS" and without any express or
11 * implied warranties, including, without limitation, the implied
12 * warranties of merchantability and fitness for a particular
13 * purpose.
14 *
|
15 * $FreeBSD: head/sys/boot/i386/boot2/sio.S 129240 2004-05-14 20:29:30Z ru $
| 15 * $FreeBSD: head/sys/boot/i386/boot2/sio.S 149212 2005-08-18 00:42:45Z iedowse $
|
16 */
17
18 .set SIO_PRT,SIOPRT # Base port
19 .set SIO_FMT,SIOFMT # 8N1
| 16 */
17
18 .set SIO_PRT,SIOPRT # Base port
19 .set SIO_FMT,SIOFMT # 8N1
|
20 .set SIO_DIV,(115200/SIOSPD) # 115200 / SPD
| |
21
22 .globl sio_init
23 .globl sio_flush
24 .globl sio_putc
25 .globl sio_getc
26 .globl sio_ischar
27
| 20
21 .globl sio_init
22 .globl sio_flush
23 .globl sio_putc
24 .globl sio_getc
25 .globl sio_ischar
26
|
28/* void sio_init(void) */
| 27/* void sio_init(int div) */
|
29
30sio_init: movw $SIO_PRT+0x3,%dx # Data format reg
31 movb $SIO_FMT|0x80,%al # Set format
32 outb %al,(%dx) # and DLAB
33 pushl %edx # Save
34 subb $0x3,%dl # Divisor latch reg
| 28
29sio_init: movw $SIO_PRT+0x3,%dx # Data format reg
30 movb $SIO_FMT|0x80,%al # Set format
31 outb %al,(%dx) # and DLAB
32 pushl %edx # Save
33 subb $0x3,%dl # Divisor latch reg
|
35 movw $SIO_DIV,%ax # Set
| 34 movl 0x8(%esp),%eax # Set
|
36 outw %ax,(%dx) # BPS
37 popl %edx # Restore
38 movb $SIO_FMT,%al # Clear
39 outb %al,(%dx) # DLAB
40 incl %edx # Modem control reg
41 movb $0x3,%al # Set RTS,
42 outb %al,(%dx) # DTR
43 incl %edx # Line status reg
| 35 outw %ax,(%dx) # BPS
36 popl %edx # Restore
37 movb $SIO_FMT,%al # Clear
38 outb %al,(%dx) # DLAB
39 incl %edx # Modem control reg
40 movb $0x3,%al # Set RTS,
41 outb %al,(%dx) # DTR
42 incl %edx # Line status reg
|
| 43 call sio_flush
44 ret $0x4
|
44
45/* void sio_flush(void) */
46
47sio_flush.0: call sio_getc.1 # Get character
48sio_flush: call sio_ischar # Check for character
49 jnz sio_flush.0 # Till none
50 ret # To caller
51
--- 29 unchanged lines hidden --- | 45
46/* void sio_flush(void) */
47
48sio_flush.0: call sio_getc.1 # Get character
49sio_flush: call sio_ischar # Check for character
50 jnz sio_flush.0 # Till none
51 ret # To caller
52
--- 29 unchanged lines hidden --- |