1 /*
2 * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6 #include "linux/posix_types.h"
7 #include "linux/tty.h"
8 #include "linux/tty_flip.h"
9 #include "linux/types.h"
10 #include "linux/major.h"
11 #include "linux/kdev_t.h"
12 #include "linux/console.h"
13 #include "linux/string.h"
14 #include "linux/sched.h"
15 #include "linux/list.h"
16 #include "linux/init.h"
17 #include "linux/interrupt.h"
18 #include "linux/slab.h"
19 #include "linux/hardirq.h"
20 #include "asm/current.h"
21 #include "asm/irq.h"
22 #include "stdio_console.h"
23 #include "line.h"
24 #include "chan_kern.h"
25 #include "irq_user.h"
26 #include "mconsole_kern.h"
27 #include "init.h"
28
29 #define MAX_TTYS (16)
30
31 /* Referenced only by tty_driver below - presumably it's locked correctly
32 * by the tty driver.
33 */
34
35 static struct tty_driver *console_driver;
36
37 static void stdio_announce(char *dev_name, int dev)
38 {
39 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
40 dev_name);
41 }
42
43 /* Almost const, except that xterm_title may be changed in an initcall */
44 static struct chan_opts opts = {
45 .announce = stdio_announce,
46 .xterm_title = "Virtual Console #%d",
47 .raw = 1,
48 };
49
50 static int con_config(char *str, char **error_out);
51 static int con_get_config(char *dev, char *str, int size, char **error_out);
52 static int con_remove(int n, char **con_remove);
53
54
55 /* Const, except for .mc.list */
56 static struct line_driver driver = {
57 .name = "UML console",
58 .device_name = "tty",
59 .major = TTY_MAJOR,
60 .minor_start = 0,
61 .type = TTY_DRIVER_TYPE_CONSOLE,
62 .subtype = SYSTEM_TYPE_CONSOLE,
63 .read_irq = CONSOLE_IRQ,
64 .read_irq_name = "console",
65 .write_irq = CONSOLE_WRITE_IRQ,
66 .write_irq_name = "console-write",
67 .mc = {
68 .list = LIST_HEAD_INIT(driver.mc.list),
69 .name = "con",
70 .config = con_config,
71 .get_config = con_get_config,
72 .id = line_id,
73 .remove = con_remove,
74 },
75 };
76
77 /* The array is initialized by line_init, at initcall time. The
78 * elements are locked individually as needed.
79 */
80 static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver),
81 [ 1 ... MAX_TTYS - 1 ] =
82 LINE_INIT(CONFIG_CON_CHAN, &driver) };
83
84 static int con_config(char *str, char **error_out)
85 {
86 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
87 }
88
89 static int con_get_config(char *dev, char *str, int size, char **error_out)
90 {
91 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
92 }
93
94 static int con_remove(int n, char **error_out)
95 {
96 return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
97 }
98
99 static int con_open(struct tty_struct *tty, struct file *filp)
100 {
101 int err = line_open(vts, tty);
102 if (err)
103 printk(KERN_ERR "Failed to open console %d, err = %d\n",
104 tty->index, err);
105
106 return err;
107 }
108
109 /* Set in an initcall, checked in an exitcall */
110 static int con_init_done = 0;
111
112 static const struct tty_operations console_ops = {
113 .open = con_open,
114 .close = line_close,
115 .write = line_write,
116 .put_char = line_put_char,
117 .write_room = line_write_room,
118 .chars_in_buffer = line_chars_in_buffer,
119 .flush_buffer = line_flush_buffer,
120 .flush_chars = line_flush_chars,
121 .set_termios = line_set_termios,
122 .ioctl = line_ioctl,
123 .throttle = line_throttle,
124 .unthrottle = line_unthrottle,
125 };
126
127 static void uml_console_write(struct console *console, const char *string,
128 unsigned len)
129 {
130 struct line *line = &vts[console->index];
131 unsigned long flags;
132
133 spin_lock_irqsave(&line->lock, flags);
134 console_write_chan(&line->chan_list, string, len);
135 spin_unlock_irqrestore(&line->lock, flags);
136 }
137
138 static struct tty_driver *uml_console_device(struct console *c, int *index)
139 {
140 *index = c->index;
141 return console_driver;
142 }
143
144 static int uml_console_setup(struct console *co, char *options)
145 {
146 struct line *line = &vts[co->index];
147
148 return console_open_chan(line, co);
149 }
150
151 /* No locking for register_console call - relies on single-threaded initcalls */
152 static struct console stdiocons = {
153 .name = "tty",
154 .write = uml_console_write,
155 .device = uml_console_device,
156 .setup = uml_console_setup,
157 .flags = CON_PRINTBUFFER|CON_ANYTIME,
158 .index = -1,
159 };
160
161 static int stdio_init(void)
162 {
163 char *new_title;
164
165 console_driver = register_lines(&driver, &console_ops, vts,
166 ARRAY_SIZE(vts));
167 if (console_driver == NULL)
168 return -1;
169 printk(KERN_INFO "Initialized stdio console driver\n");
170
171 new_title = add_xterm_umid(opts.xterm_title);
172 if(new_title != NULL)
173 opts.xterm_title = new_title;
174
175 lines_init(vts, ARRAY_SIZE(vts), &opts);
176
177 con_init_done = 1;
178 register_console(&stdiocons);
179 return 0;
180 }
181 late_initcall(stdio_init);
182
183 static void console_exit(void)
184 {
185 if (!con_init_done)
186 return;
187 close_lines(vts, ARRAY_SIZE(vts));
188 }
189 __uml_exitcall(console_exit);
190
191 static int console_chan_setup(char *str)
192 {
193 char *error;
194 int ret;
195
196 ret = line_setup(vts, ARRAY_SIZE(vts), str, &error);
197 if(ret < 0)
198 printk(KERN_ERR "Failed to set up console with "
199 "configuration string \"%s\" : %s\n", str, error);
200
201 return 1;
202 }
203 __setup("con", console_chan_setup);
204 __channel_help(console_chan_setup, "con");
205
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