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 <mach_kdb.h>
36#include <platforms.h>
37#include <kern/spl.h>
38#include <mach/std_types.h>
39#include <types.h>
40#include <kern/thread.h>
41#include <console/serial_protos.h>
42
43extern void cons_cinput(char ch);		/* The BSD routine that gets characters */
44
45unsigned int serialmode;				/* Serial mode keyboard and console control */
46
47/*
48 *  This routine will start a thread that polls the serial port, listening for
49 *  characters that have been typed.
50 */
51
52void
53serial_keyboard_init(void)
54{
55	kern_return_t	result;
56	thread_t		thread;
57
58	if(!(serialmode & 2)) /* Leave if we do not want a serial console */
59		return;
60
61	kprintf("Serial keyboard started\n");
62	result = kernel_thread_start_priority((thread_continue_t)serial_keyboard_start, NULL, MAXPRI_KERNEL, &thread);
63	if (result != KERN_SUCCESS)
64		panic("serial_keyboard_init");
65
66	thread_deallocate(thread);
67}
68
69void
70serial_keyboard_start(void)
71{
72	/* Go see if there are any characters pending now */
73	serial_keyboard_poll();
74	panic("serial_keyboard_start: we can't get back here\n");
75}
76
77void
78serial_keyboard_poll(void)
79{
80	int chr;
81	uint64_t next;
82
83
84	while(1) {
85		chr = _serial_getc(0, 1, 0, 1);	/* Get a character if there is one */
86		if(chr < 0) /* The serial buffer is empty */
87			break;
88		cons_cinput((char)chr);			/* Buffer up the character */
89	}
90
91	clock_interval_to_deadline(16, 1000000, &next);	/* Get time of pop */
92
93	assert_wait_deadline((event_t)serial_keyboard_poll, THREAD_UNINT, next);	/* Show we are "waiting" */
94	thread_block((thread_continue_t)serial_keyboard_poll);	/* Wait for it */
95	panic("serial_keyboard_poll: Shouldn't never ever get here...\n");
96}
97
98boolean_t
99console_is_serial(void)
100{
101	return (cons_ops_index == SERIAL_CONS_OPS);
102}
103
104int
105switch_to_video_console(void)
106{
107	int old_cons_ops = cons_ops_index;
108	cons_ops_index = VC_CONS_OPS;
109	return old_cons_ops;
110}
111
112int
113switch_to_serial_console(void)
114{
115	int old_cons_ops = cons_ops_index;
116	cons_ops_index = SERIAL_CONS_OPS;
117	return old_cons_ops;
118}
119
120/* The switch_to_{video,serial,kgdb}_console functions return a cookie that
121   can be used to restore the console to whatever it was before, in the
122   same way that splwhatever() and splx() work.  */
123void
124switch_to_old_console(int old_console)
125{
126	static boolean_t squawked;
127	uint32_t ops = old_console;
128
129	if ((ops >= nconsops) && !squawked) {
130		squawked = TRUE;
131		printf("switch_to_old_console: unknown ops %d\n", ops);
132	} else
133		cons_ops_index = ops;
134}
135