Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
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 "chan.h"
24 : #include <irq_user.h>
25 : #include "mconsole_kern.h"
26 : #include <init.h>
27 :
28 : #define MAX_TTYS (16)
29 :
30 0 : static void stdio_announce(char *dev_name, int dev)
31 : {
32 0 : printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
33 : dev_name);
34 0 : }
35 :
36 : /* Almost const, except that xterm_title may be changed in an initcall */
37 : static struct chan_opts opts = {
38 : .announce = stdio_announce,
39 : .xterm_title = "Virtual Console #%d",
40 : .raw = 1,
41 : };
42 :
43 : static int con_config(char *str, char **error_out);
44 : static int con_get_config(char *dev, char *str, int size, char **error_out);
45 : static int con_remove(int n, char **con_remove);
46 :
47 :
48 : /* Const, except for .mc.list */
49 : static struct line_driver driver = {
50 : .name = "UML console",
51 : .device_name = "tty",
52 : .major = TTY_MAJOR,
53 : .minor_start = 0,
54 : .type = TTY_DRIVER_TYPE_CONSOLE,
55 : .subtype = SYSTEM_TYPE_CONSOLE,
56 : .read_irq_name = "console",
57 : .write_irq_name = "console-write",
58 : .mc = {
59 : .list = LIST_HEAD_INIT(driver.mc.list),
60 : .name = "con",
61 : .config = con_config,
62 : .get_config = con_get_config,
63 : .id = line_id,
64 : .remove = con_remove,
65 : },
66 : };
67 :
68 : /* The array is initialized by line_init, at initcall time. The
69 : * elements are locked individually as needed.
70 : */
71 : static char *vt_conf[MAX_TTYS];
72 : static char *def_conf;
73 : static struct line vts[MAX_TTYS];
74 :
75 0 : static int con_config(char *str, char **error_out)
76 : {
77 0 : return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out);
78 : }
79 :
80 0 : static int con_get_config(char *dev, char *str, int size, char **error_out)
81 : {
82 0 : return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out);
83 : }
84 :
85 0 : static int con_remove(int n, char **error_out)
86 : {
87 0 : return line_remove(vts, ARRAY_SIZE(vts), n, error_out);
88 : }
89 :
90 : /* Set in an initcall, checked in an exitcall */
91 : static int con_init_done;
92 :
93 0 : static int con_install(struct tty_driver *driver, struct tty_struct *tty)
94 : {
95 0 : return line_install(driver, tty, &vts[tty->index]);
96 : }
97 :
98 : static const struct tty_operations console_ops = {
99 : .open = line_open,
100 : .install = con_install,
101 : .close = line_close,
102 : .write = line_write,
103 : .write_room = line_write_room,
104 : .chars_in_buffer = line_chars_in_buffer,
105 : .flush_buffer = line_flush_buffer,
106 : .flush_chars = line_flush_chars,
107 : .throttle = line_throttle,
108 : .unthrottle = line_unthrottle,
109 : .hangup = line_hangup,
110 : };
111 :
112 746 : static void uml_console_write(struct console *console, const char *string,
113 : unsigned len)
114 : {
115 746 : struct line *line = &vts[console->index];
116 : unsigned long flags;
117 :
118 746 : spin_lock_irqsave(&line->lock, flags);
119 746 : console_write_chan(line->chan_out, string, len);
120 1492 : spin_unlock_irqrestore(&line->lock, flags);
121 746 : }
122 :
123 0 : static struct tty_driver *uml_console_device(struct console *c, int *index)
124 : {
125 0 : *index = c->index;
126 0 : return driver.driver;
127 : }
128 :
129 1 : static int uml_console_setup(struct console *co, char *options)
130 : {
131 1 : struct line *line = &vts[co->index];
132 :
133 1 : return console_open_chan(line, co);
134 : }
135 :
136 : /* No locking for register_console call - relies on single-threaded initcalls */
137 : static struct console stdiocons = {
138 : .name = "tty",
139 : .write = uml_console_write,
140 : .device = uml_console_device,
141 : .setup = uml_console_setup,
142 : .flags = CON_PRINTBUFFER|CON_ANYTIME,
143 : .index = -1,
144 : };
145 :
146 1 : static int stdio_init(void)
147 : {
148 : char *new_title;
149 : int err;
150 : int i;
151 :
152 1 : err = register_lines(&driver, &console_ops, vts,
153 : ARRAY_SIZE(vts));
154 1 : if (err)
155 : return err;
156 :
157 1 : printk(KERN_INFO "Initialized stdio console driver\n");
158 :
159 1 : new_title = add_xterm_umid(opts.xterm_title);
160 1 : if(new_title != NULL)
161 1 : opts.xterm_title = new_title;
162 :
163 16 : for (i = 0; i < MAX_TTYS; i++) {
164 : char *error;
165 16 : char *s = vt_conf[i];
166 16 : if (!s)
167 16 : s = def_conf;
168 16 : if (!s)
169 16 : s = i ? CONFIG_CON_CHAN : CONFIG_CON_ZERO_CHAN;
170 16 : if (setup_one_line(vts, i, s, &opts, &error))
171 15 : printk(KERN_ERR "setup_one_line failed for "
172 : "device %d : %s\n", i, error);
173 : }
174 :
175 1 : con_init_done = 1;
176 1 : register_console(&stdiocons);
177 1 : return 0;
178 : }
179 : late_initcall(stdio_init);
180 :
181 1 : static void console_exit(void)
182 : {
183 1 : if (!con_init_done)
184 : return;
185 1 : close_lines(vts, ARRAY_SIZE(vts));
186 : }
187 : __uml_exitcall(console_exit);
188 :
189 1 : static int console_chan_setup(char *str)
190 : {
191 1 : if (!strncmp(str, "sole=", 5)) /* console= option specifies tty */
192 : return 0;
193 :
194 0 : line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console");
195 0 : return 1;
196 : }
197 : __setup("con", console_chan_setup);
198 : __channel_help(console_chan_setup, "con");
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