1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
* Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/config.h"
#include "linux/fs.h"
#include "linux/tty.h"
#include "linux/tty_driver.h"
#include "linux/major.h"
#include "linux/mm.h"
#include "linux/init.h"
#include "linux/console.h"
#include "asm/termbits.h"
#include "asm/irq.h"
#include "line.h"
#include "ssl.h"
#include "chan_kern.h"
#include "user_util.h"
#include "kern_util.h"
#include "kern.h"
#include "init.h"
#include "irq_user.h"
#include "mconsole_kern.h"
static int ssl_version = 1;
/* Referenced only by tty_driver below - presumably it's locked correctly
* by the tty driver.
*/
static struct tty_driver *ssl_driver;
#define NR_PORTS 64
void ssl_announce(char *dev_name, int dev)
{
printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
dev_name);
}
static struct chan_opts opts = {
.announce = ssl_announce,
.xterm_title = "Serial Line #%d",
.raw = 1,
.tramp_stack = 0,
.in_kernel = 1,
};
static int ssl_config(char *str);
static int ssl_get_config(char *dev, char *str, int size, char **error_out);
static int ssl_remove(int n);
static struct line_driver driver = {
.name = "UML serial line",
.device_name = "ttyS",
.devfs_name = "tts/",
.major = TTY_MAJOR,
.minor_start = 64,
.type = TTY_DRIVER_TYPE_SERIAL,
.subtype = 0,
.read_irq = SSL_IRQ,
.read_irq_name = "ssl",
.write_irq = SSL_WRITE_IRQ,
.write_irq_name = "ssl-write",
.symlink_from = "serial",
.symlink_to = "tts",
.mc = {
.name = "ssl",
.config = ssl_config,
.get_config = ssl_get_config,
.id = line_id,
.remove = ssl_remove,
},
};
/* The array is initialized by line_init, which is an initcall. The
* individual elements are protected by individual semaphores.
*/
static struct line serial_lines[NR_PORTS] =
{ [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
static struct lines lines = LINES_INIT(NR_PORTS);
static int ssl_config(char *str)
{
return(line_config(serial_lines,
sizeof(serial_lines)/sizeof(serial_lines[0]), str));
}
static int ssl_get_config(char *dev, char *str, int size, char **error_out)
{
return(line_get_config(dev, serial_lines,
sizeof(serial_lines)/sizeof(serial_lines[0]),
str, size, error_out));
}
static int ssl_remove(int n)
{
return line_remove(serial_lines,
sizeof(serial_lines)/sizeof(serial_lines[0]), n);
}
int ssl_open(struct tty_struct *tty, struct file *filp)
{
return line_open(serial_lines, tty, &opts);
}
#if 0
static void ssl_flush_buffer(struct tty_struct *tty)
{
return;
}
static void ssl_throttle(struct tty_struct * tty)
{
printk(KERN_ERR "Someone should implement ssl_throttle\n");
}
static void ssl_unthrottle(struct tty_struct * tty)
{
printk(KERN_ERR "Someone should implement ssl_unthrottle\n");
}
static void ssl_stop(struct tty_struct *tty)
{
printk(KERN_ERR "Someone should implement ssl_stop\n");
}
static void ssl_start(struct tty_struct *tty)
{
printk(KERN_ERR "Someone should implement ssl_start\n");
}
void ssl_hangup(struct tty_struct *tty)
{
}
#endif
static struct tty_operations ssl_ops = {
.open = ssl_open,
.close = line_close,
.write = line_write,
.put_char = line_put_char,
.write_room = line_write_room,
.chars_in_buffer = line_chars_in_buffer,
.flush_buffer = line_flush_buffer,
.flush_chars = line_flush_chars,
.set_termios = line_set_termios,
.ioctl = line_ioctl,
#if 0
.throttle = ssl_throttle,
.unthrottle = ssl_unthrottle,
.stop = ssl_stop,
.start = ssl_start,
.hangup = ssl_hangup,
#endif
};
/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
* by being an initcall and exitcall, respectively.
*/
static int ssl_init_done = 0;
static void ssl_console_write(struct console *c, const char *string,
unsigned len)
{
struct line *line = &serial_lines[c->index];
unsigned long flags;
spin_lock_irqsave(&line->lock, flags);
console_write_chan(&line->chan_list, string, len);
spin_unlock_irqrestore(&line->lock, flags);
}
static struct tty_driver *ssl_console_device(struct console *c, int *index)
{
*index = c->index;
return ssl_driver;
}
static int ssl_console_setup(struct console *co, char *options)
{
struct line *line = &serial_lines[co->index];
return console_open_chan(line,co,&opts);
}
static struct console ssl_cons = {
.name = "ttyS",
.write = ssl_console_write,
.device = ssl_console_device,
.setup = ssl_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
};
int ssl_init(void)
{
char *new_title;
printk(KERN_INFO "Initializing software serial port version %d\n",
ssl_version);
ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops,
serial_lines, ARRAY_SIZE(serial_lines));
lines_init(serial_lines, sizeof(serial_lines)/sizeof(serial_lines[0]));
new_title = add_xterm_umid(opts.xterm_title);
if (new_title != NULL)
opts.xterm_title = new_title;
ssl_init_done = 1;
register_console(&ssl_cons);
return(0);
}
late_initcall(ssl_init);
static void ssl_exit(void)
{
if (!ssl_init_done)
return;
close_lines(serial_lines,
sizeof(serial_lines)/sizeof(serial_lines[0]));
}
__uml_exitcall(ssl_exit);
static int ssl_chan_setup(char *str)
{
return(line_setup(serial_lines,
sizeof(serial_lines)/sizeof(serial_lines[0]),
str, 1));
}
__setup("ssl", ssl_chan_setup);
__channel_help(ssl_chan_setup, "ssl");
|
