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