Alex Dewar | dbddf42 | 2019-08-25 10:49:16 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | */ |
| 5 | |
Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 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> |
Al Viro | 510c72a3 | 2011-08-18 20:08:29 +0100 | [diff] [blame] | 15 | #include "chan.h" |
Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 16 | #include <init.h> |
| 17 | #include <irq_user.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "mconsole_kern.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Jeff Dike | 5e7672e | 2006-09-27 01:50:33 -0700 | [diff] [blame] | 20 | static const int ssl_version = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #define NR_PORTS 64 |
| 23 | |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 24 | static void ssl_announce(char *dev_name, int dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | { |
| 26 | printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev, |
| 27 | dev_name); |
| 28 | } |
| 29 | |
Jeff Dike | a52f362 | 2007-02-10 01:44:06 -0800 | [diff] [blame] | 30 | /* Almost const, except that xterm_title may be changed in an initcall */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | static struct chan_opts opts = { |
| 32 | .announce = ssl_announce, |
| 33 | .xterm_title = "Serial Line #%d", |
| 34 | .raw = 1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | }; |
| 36 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 37 | static int ssl_config(char *str, char **error_out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | static int ssl_get_config(char *dev, char *str, int size, char **error_out); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 39 | static int ssl_remove(int n, char **error_out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Jeff Dike | d5c9ffc | 2007-02-10 01:44:08 -0800 | [diff] [blame] | 41 | |
| 42 | /* Const, except for .mc.list */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | static struct line_driver driver = { |
| 44 | .name = "UML serial line", |
| 45 | .device_name = "ttyS", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | .major = TTY_MAJOR, |
| 47 | .minor_start = 64, |
| 48 | .type = TTY_DRIVER_TYPE_SERIAL, |
| 49 | .subtype = 0, |
| 50 | .read_irq = SSL_IRQ, |
| 51 | .read_irq_name = "ssl", |
| 52 | .write_irq = SSL_WRITE_IRQ, |
| 53 | .write_irq_name = "ssl-write", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | .mc = { |
Jeff Dike | 84f48d4 | 2007-02-10 01:44:01 -0800 | [diff] [blame] | 55 | .list = LIST_HEAD_INIT(driver.mc.list), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | .name = "ssl", |
| 57 | .config = ssl_config, |
| 58 | .get_config = ssl_get_config, |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 59 | .id = line_id, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | .remove = ssl_remove, |
| 61 | }, |
| 62 | }; |
| 63 | |
Jeff Dike | d5c9ffc | 2007-02-10 01:44:08 -0800 | [diff] [blame] | 64 | /* The array is initialized by line_init, at initcall time. The |
| 65 | * elements are locked individually as needed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | */ |
Al Viro | 43574c1 | 2011-09-09 17:25:00 -0400 | [diff] [blame] | 67 | static char *conf[NR_PORTS]; |
| 68 | static char *def_conf = CONFIG_SSL_CHAN; |
| 69 | static struct line serial_lines[NR_PORTS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 71 | static int ssl_config(char *str, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 73 | return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts, |
| 74 | error_out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | static int ssl_get_config(char *dev, char *str, int size, char **error_out) |
| 78 | { |
Jeff Dike | 0834cc7 | 2006-01-06 00:18:51 -0800 | [diff] [blame] | 79 | return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str, |
| 80 | size, error_out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | } |
| 82 | |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 83 | static int ssl_remove(int n, char **error_out) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 85 | return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n, |
| 86 | error_out); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
Richard Weinberger | 79e0273 | 2012-06-04 21:57:24 +0200 | [diff] [blame] | 89 | static int ssl_install(struct tty_driver *driver, struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | { |
Richard Weinberger | 79e0273 | 2012-06-04 21:57:24 +0200 | [diff] [blame] | 91 | return line_install(driver, tty, &serial_lines[tty->index]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
Jeff Dike | 5e7672e | 2006-09-27 01:50:33 -0700 | [diff] [blame] | 94 | static const struct tty_operations ssl_ops = { |
Richard Weinberger | 79e0273 | 2012-06-04 21:57:24 +0200 | [diff] [blame] | 95 | .open = line_open, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | .close = line_close, |
| 97 | .write = line_write, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | .write_room = line_write_room, |
| 99 | .chars_in_buffer = line_chars_in_buffer, |
Paolo 'Blaisorblade' Giarrusso | b97b77c | 2005-05-01 08:58:56 -0700 | [diff] [blame] | 100 | .flush_buffer = line_flush_buffer, |
| 101 | .flush_chars = line_flush_chars, |
Jeff Dike | e4dcee8 | 2006-01-06 00:18:58 -0800 | [diff] [blame] | 102 | .throttle = line_throttle, |
| 103 | .unthrottle = line_unthrottle, |
Richard Weinberger | 79e0273 | 2012-06-04 21:57:24 +0200 | [diff] [blame] | 104 | .install = ssl_install, |
Richard Weinberger | 79e0273 | 2012-06-04 21:57:24 +0200 | [diff] [blame] | 105 | .hangup = line_hangup, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | }; |
| 107 | |
| 108 | /* Changed by ssl_init and referenced by ssl_exit, which are both serialized |
| 109 | * by being an initcall and exitcall, respectively. |
| 110 | */ |
| 111 | static int ssl_init_done = 0; |
| 112 | |
| 113 | static void ssl_console_write(struct console *c, const char *string, |
| 114 | unsigned len) |
| 115 | { |
| 116 | struct line *line = &serial_lines[c->index]; |
Paolo 'Blaisorblade' Giarrusso | b97b77c | 2005-05-01 08:58:56 -0700 | [diff] [blame] | 117 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Paolo 'Blaisorblade' Giarrusso | b97b77c | 2005-05-01 08:58:56 -0700 | [diff] [blame] | 119 | spin_lock_irqsave(&line->lock, flags); |
Al Viro | bed5e39 | 2011-09-08 10:49:34 -0400 | [diff] [blame] | 120 | console_write_chan(line->chan_out, string, len); |
Paolo 'Blaisorblade' Giarrusso | b97b77c | 2005-05-01 08:58:56 -0700 | [diff] [blame] | 121 | spin_unlock_irqrestore(&line->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | static struct tty_driver *ssl_console_device(struct console *c, int *index) |
| 125 | { |
| 126 | *index = c->index; |
Al Viro | cfe6b7c | 2011-09-09 19:45:42 -0400 | [diff] [blame] | 127 | return driver.driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | static int ssl_console_setup(struct console *co, char *options) |
| 131 | { |
| 132 | struct line *line = &serial_lines[co->index]; |
| 133 | |
Jeff Dike | a52f362 | 2007-02-10 01:44:06 -0800 | [diff] [blame] | 134 | return console_open_chan(line, co); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | |
Jeff Dike | d5c9ffc | 2007-02-10 01:44:08 -0800 | [diff] [blame] | 137 | /* No locking for register_console call - relies on single-threaded initcalls */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | static struct console ssl_cons = { |
| 139 | .name = "ttyS", |
| 140 | .write = ssl_console_write, |
| 141 | .device = ssl_console_device, |
| 142 | .setup = ssl_console_setup, |
Paolo 'Blaisorblade' Giarrusso | b533788 | 2007-03-07 20:41:11 -0800 | [diff] [blame] | 143 | .flags = CON_PRINTBUFFER|CON_ANYTIME, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | .index = -1, |
| 145 | }; |
| 146 | |
Paolo 'Blaisorblade' Giarrusso | 42947cb | 2006-02-01 03:06:29 -0800 | [diff] [blame] | 147 | static int ssl_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | { |
| 149 | char *new_title; |
Al Viro | cfe6b7c | 2011-09-09 19:45:42 -0400 | [diff] [blame] | 150 | int err; |
Al Viro | 43574c1 | 2011-09-09 17:25:00 -0400 | [diff] [blame] | 151 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 153 | printk(KERN_INFO "Initializing software serial port version %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | ssl_version); |
Al Viro | 43574c1 | 2011-09-09 17:25:00 -0400 | [diff] [blame] | 155 | |
Al Viro | cfe6b7c | 2011-09-09 19:45:42 -0400 | [diff] [blame] | 156 | err = register_lines(&driver, &ssl_ops, serial_lines, |
Jeff Dike | d5c9ffc | 2007-02-10 01:44:08 -0800 | [diff] [blame] | 157 | ARRAY_SIZE(serial_lines)); |
Al Viro | cfe6b7c | 2011-09-09 19:45:42 -0400 | [diff] [blame] | 158 | if (err) |
| 159 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | new_title = add_xterm_umid(opts.xterm_title); |
| 162 | if (new_title != NULL) |
| 163 | opts.xterm_title = new_title; |
| 164 | |
Al Viro | 04292b2 | 2011-09-09 20:07:05 -0400 | [diff] [blame] | 165 | for (i = 0; i < NR_PORTS; i++) { |
| 166 | char *error; |
| 167 | char *s = conf[i]; |
| 168 | if (!s) |
| 169 | s = def_conf; |
| 170 | if (setup_one_line(serial_lines, i, s, &opts, &error)) |
| 171 | printk(KERN_ERR "setup_one_line failed for " |
| 172 | "device %d : %s\n", i, error); |
| 173 | } |
Davide Brini | 57ac895 | 2007-05-06 14:51:16 -0700 | [diff] [blame] | 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | ssl_init_done = 1; |
| 176 | register_console(&ssl_cons); |
Jeff Dike | d50084a | 2006-01-06 00:18:50 -0800 | [diff] [blame] | 177 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
| 179 | late_initcall(ssl_init); |
| 180 | |
| 181 | static void ssl_exit(void) |
| 182 | { |
| 183 | if (!ssl_init_done) |
| 184 | return; |
Jeff Dike | 0834cc7 | 2006-01-06 00:18:51 -0800 | [diff] [blame] | 185 | close_lines(serial_lines, ARRAY_SIZE(serial_lines)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
| 187 | __uml_exitcall(ssl_exit); |
| 188 | |
| 189 | static int ssl_chan_setup(char *str) |
| 190 | { |
Al Viro | 43574c1 | 2011-09-09 17:25:00 -0400 | [diff] [blame] | 191 | line_setup(conf, NR_PORTS, &def_conf, str, "serial line"); |
Jeff Dike | f28169d | 2007-02-10 01:43:53 -0800 | [diff] [blame] | 192 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | __setup("ssl", ssl_chan_setup); |
| 196 | __channel_help(ssl_chan_setup, "ssl"); |
Johannes Berg | f1dc67d | 2019-05-25 00:08:43 +0200 | [diff] [blame] | 197 | |
| 198 | static int ssl_non_raw_setup(char *str) |
| 199 | { |
| 200 | opts.raw = 0; |
| 201 | return 1; |
| 202 | } |
| 203 | __setup("ssl-non-raw", ssl_non_raw_setup); |
| 204 | __channel_help(ssl_non_raw_setup, "set serial lines to non-raw mode"); |