1/*
2 * Copyright (c) 2005-2006 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * @OSF_COPYRIGHT@
30 */
31/*
32 * @APPLE_FREE_COPYRIGHT@
33 */
34
35#include <platforms.h>
36#include <kern/spl.h>
37#include <mach/std_types.h>
38#include <types.h>
39#include <kern/thread.h>
40#include <console/serial_protos.h>
41
42extern void cons_cinput(char ch);		/* The BSD routine that gets characters */
43
44unsigned int serialmode;				/* Serial mode keyboard and console control */
45
46/*
47 *  This routine will start a thread that polls the serial port, listening for
48 *  characters that have been typed.
49 */
50
51void
52serial_keyboard_init(void)
53{
54	kern_return_t	result;
55	thread_t		thread;
56
57	if(!(serialmode & 2)) /* Leave if we do not want a serial console */
58		return;
59
60	kprintf("Serial keyboard started\n");
61	result = kernel_thread_start_priority((thread_continue_t)serial_keyboard_start, NULL, MAXPRI_KERNEL, &thread);
62	if (result != KERN_SUCCESS)
63		panic("serial_keyboard_init");
64
65	thread_deallocate(thread);
66}
67
68void
69serial_keyboard_start(void)
70{
71	/* Go see if there are any characters pending now */
72	serial_keyboard_poll();
73	panic("serial_keyboard_start: we can't get back here\n");
74}
75
76void
77serial_keyboard_poll(void)
78{
79	int chr;
80	uint64_t next;
81
82	while(1) {
83		chr = _serial_getc(0, 1, 0, 1);	/* Get a character if there is one */
84		if(chr < 0) /* The serial buffer is empty */
85			break;
86		cons_cinput((char)chr);			/* Buffer up the character */
87	}
88
89	clock_interval_to_deadline(16, 1000000, &next);	/* Get time of pop */
90
91	assert_wait_deadline((event_t)serial_keyboard_poll, THREAD_UNINT, next);	/* Show we are "waiting" */
92	thread_block((thread_continue_t)serial_keyboard_poll);	/* Wait for it */
93	panic("serial_keyboard_poll: Shouldn't never ever get here...\n");
94}
95
96boolean_t
97console_is_serial(void)
98{
99	return (cons_ops_index == SERIAL_CONS_OPS);
100}
101
102int
103switch_to_video_console(void)
104{
105	int old_cons_ops = cons_ops_index;
106	cons_ops_index = VC_CONS_OPS;
107	return old_cons_ops;
108}
109
110int
111switch_to_serial_console(void)
112{
113	int old_cons_ops = cons_ops_index;
114	cons_ops_index = SERIAL_CONS_OPS;
115	return old_cons_ops;
116}
117
118/* The switch_to_{video,serial,kgdb}_console functions return a cookie that
119   can be used to restore the console to whatever it was before, in the
120   same way that splwhatever() and splx() work.  */
121void
122switch_to_old_console(int old_console)
123{
124	static boolean_t squawked;
125	uint32_t ops = old_console;
126
127	if ((ops >= nconsops) && !squawked) {
128		squawked = TRUE;
129		printf("switch_to_old_console: unknown ops %d\n", ops);
130	} else
131		cons_ops_index = ops;
132}
133