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 #include <libkern/section_keywords.h>
41
42 extern void cons_cinput(char ch); /* The BSD routine that gets characters */
43
44 SECURITY_READ_ONLY_LATE(unsigned 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
51 void
serial_keyboard_init(void)52 serial_keyboard_init(void)
53 {
54 kern_return_t result;
55 thread_t thread;
56
57 if (!(serialmode & SERIALMODE_INPUT)) { /* Leave if we do not want a serial console */
58 return;
59 }
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
67 thread_deallocate(thread);
68 }
69
70 void
serial_keyboard_start(void)71 serial_keyboard_start(void)
72 {
73 /* Go see if there are any characters pending now */
74 serial_keyboard_poll();
75 }
76
77 __dead2
78 void
serial_keyboard_poll(void)79 serial_keyboard_poll(void)
80 {
81 int chr;
82 uint64_t next;
83
84 while (1) {
85 chr = _serial_getc(false); /* Get a character if there is one */
86 if (chr < 0) { /* The serial buffer is empty */
87 break;
88 }
89 cons_cinput((char)chr); /* Buffer up the character */
90 }
91
92 clock_interval_to_deadline(16, 1000000, &next); /* Get time of pop */
93
94 assert_wait_deadline((event_t)serial_keyboard_poll, THREAD_UNINT, next); /* Show we are "waiting" */
95 thread_block((thread_continue_t)serial_keyboard_poll); /* Wait for it */
96 panic("serial_keyboard_poll: Shouldn't never ever get here...");
97 }
98
99 boolean_t
console_is_serial(void)100 console_is_serial(void)
101 {
102 return cons_ops_index == SERIAL_CONS_OPS;
103 }
104
105 int
switch_to_video_console(void)106 switch_to_video_console(void)
107 {
108 int old_cons_ops = cons_ops_index;
109 cons_ops_index = VC_CONS_OPS;
110 return old_cons_ops;
111 }
112
113 int
switch_to_serial_console(void)114 switch_to_serial_console(void)
115 {
116 extern bool serial_console_enabled;
117 int old_cons_ops = cons_ops_index;
118
119 if (serial_console_enabled) {
120 cons_ops_index = SERIAL_CONS_OPS;
121 }
122
123 return old_cons_ops;
124 }
125
126 /* The switch_to_{video,serial,kgdb}_console functions return a cookie that
127 * can be used to restore the console to whatever it was before, in the
128 * same way that splwhatever() and splx() work. */
129 void
switch_to_old_console(int old_console)130 switch_to_old_console(int old_console)
131 {
132 static boolean_t squawked;
133 uint32_t ops = old_console;
134
135 if ((ops >= nconsops) && !squawked) {
136 squawked = TRUE;
137 printf("switch_to_old_console: unknown ops %d\n", ops);
138 } else {
139 cons_ops_index = ops;
140 }
141 }
142
143 void
console_printbuf_state_init(struct console_printbuf_state * data,int write_on_newline,int can_block)144 console_printbuf_state_init(struct console_printbuf_state * data, int write_on_newline, int can_block)
145 {
146 if (data == NULL) {
147 return;
148 }
149 bzero(data, sizeof(struct console_printbuf_state));
150 if (write_on_newline) {
151 data->flags |= CONS_PB_WRITE_NEWLINE;
152 }
153 if (can_block) {
154 data->flags |= CONS_PB_CANBLOCK;
155 }
156 }
157
158 void
console_printbuf_putc(int ch,void * arg)159 console_printbuf_putc(int ch, void * arg)
160 {
161 struct console_printbuf_state * info = (struct console_printbuf_state *)arg;
162 info->total += 1;
163 if (info->pos < (SERIAL_CONS_BUF_SIZE - 1)) {
164 info->str[info->pos] = (char)ch;
165 info->pos += 1;
166 } else {
167 /*
168 * when len(line) > SERIAL_CONS_BUF_SIZE, we truncate the message
169 * if boot-arg 'drain_uart_sync=1' is set, then
170 * drain all the buffer right now and append new ch
171 */
172 if (serialmode & SERIALMODE_SYNCDRAIN) {
173 info->str[info->pos] = '\0';
174 console_write(info->str, info->pos);
175 info->pos = 0;
176 info->str[info->pos] = (char)ch;
177 info->pos += 1;
178 }
179 }
180
181 info->str[info->pos] = '\0';
182 /* if newline, then try output to console */
183 if (ch == '\n' && info->flags & CONS_PB_WRITE_NEWLINE) {
184 console_write(info->str, info->pos);
185 info->pos = 0;
186 info->str[info->pos] = '\0';
187 }
188 }
189
190 void
console_printbuf_clear(struct console_printbuf_state * info)191 console_printbuf_clear(struct console_printbuf_state * info)
192 {
193 if (info->pos != 0) {
194 console_write(info->str, info->pos);
195 }
196 info->pos = 0;
197 info->str[info->pos] = '\0';
198 info->total = 0;
199 }
200