tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include "linux/fs.h"
7#include "linux/tty.h"
8#include "linux/tty_driver.h"
9#include "linux/major.h"
10#include "linux/mm.h"
11#include "linux/init.h"
12#include "linux/console.h"
13#include "asm/termbits.h"
14#include "asm/irq.h"
15#include "line.h"
16#include "ssl.h"
17#include "chan_kern.h"
18#include "kern_util.h"
19#include "kern.h"
20#include "init.h"
21#include "irq_user.h"
22#include "mconsole_kern.h"
23
24static const int ssl_version = 1;
25
26/* Referenced only by tty_driver below - presumably it's locked correctly
27 * by the tty driver.
28 */
29
30static struct tty_driver *ssl_driver;
31
32#define NR_PORTS 64
33
34static void ssl_announce(char *dev_name, int dev)
35{
36 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
37 dev_name);
38}
39
40/* Almost const, except that xterm_title may be changed in an initcall */
41static struct chan_opts opts = {
42 .announce = ssl_announce,
43 .xterm_title = "Serial Line #%d",
44 .raw = 1,
45 .tramp_stack = 0,
46 .in_kernel = 1,
47};
48
49static int ssl_config(char *str, char **error_out);
50static int ssl_get_config(char *dev, char *str, int size, char **error_out);
51static int ssl_remove(int n, char **error_out);
52
53
54/* Const, except for .mc.list */
55static struct line_driver driver = {
56 .name = "UML serial line",
57 .device_name = "ttyS",
58 .major = TTY_MAJOR,
59 .minor_start = 64,
60 .type = TTY_DRIVER_TYPE_SERIAL,
61 .subtype = 0,
62 .read_irq = SSL_IRQ,
63 .read_irq_name = "ssl",
64 .write_irq = SSL_WRITE_IRQ,
65 .write_irq_name = "ssl-write",
66 .mc = {
67 .list = LIST_HEAD_INIT(driver.mc.list),
68 .name = "ssl",
69 .config = ssl_config,
70 .get_config = ssl_get_config,
71 .id = line_id,
72 .remove = ssl_remove,
73 },
74};
75
76/* The array is initialized by line_init, at initcall time. The
77 * elements are locked individually as needed.
78 */
79static struct line serial_lines[NR_PORTS] =
80 { [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
81
82static int ssl_config(char *str, char **error_out)
83{
84 return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
85 error_out);
86}
87
88static int ssl_get_config(char *dev, char *str, int size, char **error_out)
89{
90 return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
91 size, error_out);
92}
93
94static int ssl_remove(int n, char **error_out)
95{
96 return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
97 error_out);
98}
99
100static int ssl_open(struct tty_struct *tty, struct file *filp)
101{
102 return line_open(serial_lines, tty);
103}
104
105#if 0
106static void ssl_flush_buffer(struct tty_struct *tty)
107{
108 return;
109}
110
111static void ssl_stop(struct tty_struct *tty)
112{
113 printk(KERN_ERR "Someone should implement ssl_stop\n");
114}
115
116static void ssl_start(struct tty_struct *tty)
117{
118 printk(KERN_ERR "Someone should implement ssl_start\n");
119}
120
121void ssl_hangup(struct tty_struct *tty)
122{
123}
124#endif
125
126static const struct tty_operations ssl_ops = {
127 .open = ssl_open,
128 .close = line_close,
129 .write = line_write,
130 .put_char = line_put_char,
131 .write_room = line_write_room,
132 .chars_in_buffer = line_chars_in_buffer,
133 .flush_buffer = line_flush_buffer,
134 .flush_chars = line_flush_chars,
135 .set_termios = line_set_termios,
136 .ioctl = line_ioctl,
137 .throttle = line_throttle,
138 .unthrottle = line_unthrottle,
139#if 0
140 .stop = ssl_stop,
141 .start = ssl_start,
142 .hangup = ssl_hangup,
143#endif
144};
145
146/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
147 * by being an initcall and exitcall, respectively.
148 */
149static int ssl_init_done = 0;
150
151static void ssl_console_write(struct console *c, const char *string,
152 unsigned len)
153{
154 struct line *line = &serial_lines[c->index];
155 unsigned long flags;
156
157 spin_lock_irqsave(&line->lock, flags);
158 console_write_chan(&line->chan_list, string, len);
159 spin_unlock_irqrestore(&line->lock, flags);
160}
161
162static struct tty_driver *ssl_console_device(struct console *c, int *index)
163{
164 *index = c->index;
165 return ssl_driver;
166}
167
168static int ssl_console_setup(struct console *co, char *options)
169{
170 struct line *line = &serial_lines[co->index];
171
172 return console_open_chan(line, co);
173}
174
175/* No locking for register_console call - relies on single-threaded initcalls */
176static struct console ssl_cons = {
177 .name = "ttyS",
178 .write = ssl_console_write,
179 .device = ssl_console_device,
180 .setup = ssl_console_setup,
181 .flags = CON_PRINTBUFFER|CON_ANYTIME,
182 .index = -1,
183};
184
185static int ssl_init(void)
186{
187 char *new_title;
188
189 printk(KERN_INFO "Initializing software serial port version %d\n",
190 ssl_version);
191 ssl_driver = register_lines(&driver, &ssl_ops, serial_lines,
192 ARRAY_SIZE(serial_lines));
193
194 new_title = add_xterm_umid(opts.xterm_title);
195 if (new_title != NULL)
196 opts.xterm_title = new_title;
197
198 lines_init(serial_lines, ARRAY_SIZE(serial_lines), &opts);
199
200 ssl_init_done = 1;
201 register_console(&ssl_cons);
202 return 0;
203}
204late_initcall(ssl_init);
205
206static void ssl_exit(void)
207{
208 if (!ssl_init_done)
209 return;
210 close_lines(serial_lines, ARRAY_SIZE(serial_lines));
211}
212__uml_exitcall(ssl_exit);
213
214static int ssl_chan_setup(char *str)
215{
216 char *error;
217 int ret;
218
219 ret = line_setup(serial_lines, ARRAY_SIZE(serial_lines), str, &error);
220 if(ret < 0)
221 printk(KERN_ERR "Failed to set up serial line with "
222 "configuration string \"%s\" : %s\n", str, error);
223
224 return 1;
225}
226
227__setup("ssl", ssl_chan_setup);
228__channel_help(ssl_chan_setup, "ssl");