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 |
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(fmt: "Serial keyboard started\n" ); |
62 | result = kernel_thread_start_priority(continuation: (thread_continue_t)serial_keyboard_start, NULL, MAXPRI_KERNEL, new_thread: &thread); |
63 | if (result != KERN_SUCCESS) { |
64 | panic("serial_keyboard_init" ); |
65 | } |
66 | |
67 | thread_deallocate(thread); |
68 | } |
69 | |
70 | 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 |
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(ch: (char)chr); /* Buffer up the character */ |
90 | } |
91 | |
92 | clock_interval_to_deadline(interval: 16, scale_factor: 1000000, result: &next); /* Get time of pop */ |
93 | |
94 | assert_wait_deadline(event: (event_t)serial_keyboard_poll, THREAD_UNINT, deadline: next); /* Show we are "waiting" */ |
95 | thread_block(continuation: (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 |
100 | console_is_serial(void) |
101 | { |
102 | return cons_ops_index == SERIAL_CONS_OPS; |
103 | } |
104 | |
105 | int |
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 |
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 |
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(format: "switch_to_old_console: unknown ops %d\n" , ops); |
138 | } else { |
139 | cons_ops_index = ops; |
140 | } |
141 | } |
142 | |
143 | void |
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(s: data, n: 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 |
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 |
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 | |