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 | 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 | |
68 | void |
69 | serial_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 | |
76 | void |
77 | serial_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 | |
96 | boolean_t |
97 | console_is_serial(void) |
98 | { |
99 | return (cons_ops_index == SERIAL_CONS_OPS); |
100 | } |
101 | |
102 | int |
103 | switch_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 | |
110 | int |
111 | switch_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. */ |
121 | void |
122 | switch_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 | |
134 | void |
135 | console_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 | |
146 | void |
147 | console_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 | |
178 | void |
179 | console_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 | |