1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com) 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 "chan.h" 16 #include <init.h> 17 #include <irq_user.h> 18 #include "mconsole_kern.h" 19 20 static const int ssl_version = 1; 21 22 #define NR_PORTS 64 23 24 static void ssl_announce(char *dev_name, int dev) 25 { 26 printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev, 27 dev_name); 28 } 29 30 /* Almost const, except that xterm_title may be changed in an initcall */ 31 static struct chan_opts opts = { 32 .announce = ssl_announce, 33 .xterm_title = "Serial Line #%d", 34 .raw = 1, 35 }; 36 37 static int ssl_config(char *str, char **error_out); 38 static int ssl_get_config(char *dev, char *str, int size, char **error_out); 39 static int ssl_remove(int n, char **error_out); 40 41 42 /* Const, except for .mc.list */ 43 static struct line_driver driver = { 44 .name = "UML serial line", 45 .device_name = "ttyS", 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", 54 .mc = { 55 .list = LIST_HEAD_INIT(driver.mc.list), 56 .name = "ssl", 57 .config = ssl_config, 58 .get_config = ssl_get_config, 59 .id = line_id, 60 .remove = ssl_remove, 61 }, 62 }; 63 64 /* The array is initialized by line_init, at initcall time. The 65 * elements are locked individually as needed. 66 */ 67 static char *conf[NR_PORTS]; 68 static char *def_conf = CONFIG_SSL_CHAN; 69 static struct line serial_lines[NR_PORTS]; 70 71 static int ssl_config(char *str, char **error_out) 72 { 73 return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts, 74 error_out); 75 } 76 77 static int ssl_get_config(char *dev, char *str, int size, char **error_out) 78 { 79 return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str, 80 size, error_out); 81 } 82 83 static int ssl_remove(int n, char **error_out) 84 { 85 return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n, 86 error_out); 87 } 88 89 static int ssl_install(struct tty_driver *driver, struct tty_struct *tty) 90 { 91 return line_install(driver, tty, &serial_lines[tty->index]); 92 } 93 94 static const struct tty_operations ssl_ops = { 95 .open = line_open, 96 .close = line_close, 97 .write = line_write, 98 .write_room = line_write_room, 99 .chars_in_buffer = line_chars_in_buffer, 100 .flush_buffer = line_flush_buffer, 101 .flush_chars = line_flush_chars, 102 .throttle = line_throttle, 103 .unthrottle = line_unthrottle, 104 .install = ssl_install, 105 .hangup = line_hangup, 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]; 117 unsigned long flags; 118 119 spin_lock_irqsave(&line->lock, flags); 120 console_write_chan(line->chan_out, string, len); 121 spin_unlock_irqrestore(&line->lock, flags); 122 } 123 124 static struct tty_driver *ssl_console_device(struct console *c, int *index) 125 { 126 *index = c->index; 127 return driver.driver; 128 } 129 130 static int ssl_console_setup(struct console *co, char *options) 131 { 132 struct line *line = &serial_lines[co->index]; 133 134 return console_open_chan(line, co); 135 } 136 137 /* No locking for register_console call - relies on single-threaded initcalls */ 138 static struct console ssl_cons = { 139 .name = "ttyS", 140 .write = ssl_console_write, 141 .device = ssl_console_device, 142 .setup = ssl_console_setup, 143 .flags = CON_PRINTBUFFER|CON_ANYTIME, 144 .index = -1, 145 }; 146 147 static int ssl_init(void) 148 { 149 char *new_title; 150 int err; 151 int i; 152 153 printk(KERN_INFO "Initializing software serial port version %d\n", 154 ssl_version); 155 156 err = register_lines(&driver, &ssl_ops, serial_lines, 157 ARRAY_SIZE(serial_lines)); 158 if (err) 159 return err; 160 161 new_title = add_xterm_umid(opts.xterm_title); 162 if (new_title != NULL) 163 opts.xterm_title = new_title; 164 165 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 } 174 175 ssl_init_done = 1; 176 register_console(&ssl_cons); 177 return 0; 178 } 179 late_initcall(ssl_init); 180 181 static void ssl_exit(void) 182 { 183 if (!ssl_init_done) 184 return; 185 close_lines(serial_lines, ARRAY_SIZE(serial_lines)); 186 } 187 __uml_exitcall(ssl_exit); 188 189 static int ssl_chan_setup(char *str) 190 { 191 line_setup(conf, NR_PORTS, &def_conf, str, "serial line"); 192 return 1; 193 } 194 195 __setup("ssl", ssl_chan_setup); 196 __channel_help(ssl_chan_setup, "ssl"); 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"); 205