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
42extern void cons_cinput(char ch); /* The BSD routine that gets characters */
43
44SECURITY_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
51void
52serial_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 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
134void
135console_printbuf_state_init(struct console_printbuf_state * data, int write_on_newline, int can_block)
136{
137 if (data == NULL)
138 return;
139 bzero(data, sizeof(struct console_printbuf_state));
140 if (write_on_newline)
141 data->flags |= CONS_PB_WRITE_NEWLINE;
142 if (can_block)
143 data->flags |= CONS_PB_CANBLOCK;
144}
145
146void
147console_printbuf_putc(int ch, void * arg)
148{
149 struct console_printbuf_state * info = (struct console_printbuf_state *)arg;
150 info->total += 1;
151 if (info->pos < (SERIAL_CONS_BUF_SIZE - 1)) {
152 info->str[info->pos] = ch;
153 info->pos += 1;
154 } else {
155 /*
156 * when len(line) > SERIAL_CONS_BUF_SIZE, we truncate the message
157 * if boot-arg 'drain_uart_sync=1' is set, then
158 * drain all the buffer right now and append new ch
159 */
160 if (serialmode & SERIALMODE_SYNCDRAIN) {
161 info->str[info->pos] = '\0';
162 console_write(info->str, info->pos);
163 info->pos = 0;
164 info->str[info->pos] = ch;
165 info->pos += 1;
166 }
167 }
168
169 info->str[info->pos] = '\0';
170 /* if newline, then try output to console */
171 if (ch == '\n' && info->flags & CONS_PB_WRITE_NEWLINE) {
172 console_write(info->str, info->pos);
173 info->pos = 0;
174 info->str[info->pos] = '\0';
175 }
176}
177
178void
179console_printbuf_clear(struct console_printbuf_state * info) {
180 if (info->pos != 0) {
181 console_write(info->str, info->pos);
182 }
183 info->pos = 0;
184 info->str[info->pos] = '\0';
185 info->total = 0;
186}
187
188