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 "user_util.h" 26 #include "kern_util.h" 27 #include "irq_user.h" 28 #include "mconsole_kern.h" 29 #include "init.h" 30 31 #define MAX_TTYS (16) 32 33 /* Referenced only by tty_driver below - presumably it's locked correctly 34 * by the tty driver. 35 */ 36 37 static struct tty_driver *console_driver; 38 39 void stdio_announce(char *dev_name, int dev) 40 { 41 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev, 42 dev_name); 43 } 44 45 static struct chan_opts opts = { 46 .announce = stdio_announce, 47 .xterm_title = "Virtual Console #%d", 48 .raw = 1, 49 .tramp_stack = 0, 50 .in_kernel = 1, 51 }; 52 53 static int con_config(char *str, char **error_out); 54 static int con_get_config(char *dev, char *str, int size, char **error_out); 55 static int con_remove(int n, char **con_remove); 56 57 static struct line_driver driver = { 58 .name = "UML console", 59 .device_name = "tty", 60 .major = TTY_MAJOR, 61 .minor_start = 0, 62 .type = TTY_DRIVER_TYPE_CONSOLE, 63 .subtype = SYSTEM_TYPE_CONSOLE, 64 .read_irq = CONSOLE_IRQ, 65 .read_irq_name = "console", 66 .write_irq = CONSOLE_WRITE_IRQ, 67 .write_irq_name = "console-write", 68 .symlink_from = "ttys", 69 .symlink_to = "vc", 70 .mc = { 71 .name = "con", 72 .config = con_config, 73 .get_config = con_get_config, 74 .id = line_id, 75 .remove = con_remove, 76 }, 77 }; 78 79 static struct lines console_lines = LINES_INIT(MAX_TTYS); 80 81 /* The array is initialized by line_init, which is an initcall. The 82 * individual elements are protected by individual semaphores. 83 */ 84 static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver), 85 [ 1 ... MAX_TTYS - 1 ] = 86 LINE_INIT(CONFIG_CON_CHAN, &driver) }; 87 88 static int con_config(char *str, char **error_out) 89 { 90 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out); 91 } 92 93 static int con_get_config(char *dev, char *str, int size, char **error_out) 94 { 95 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out); 96 } 97 98 static int con_remove(int n, char **error_out) 99 { 100 return line_remove(vts, ARRAY_SIZE(vts), n, error_out); 101 } 102 103 static int con_open(struct tty_struct *tty, struct file *filp) 104 { 105 return line_open(vts, tty); 106 } 107 108 /* Set in an initcall, checked in an exitcall */ 109 static int con_init_done = 0; 110 111 static const struct tty_operations console_ops = { 112 .open = con_open, 113 .close = line_close, 114 .write = line_write, 115 .put_char = line_put_char, 116 .write_room = line_write_room, 117 .chars_in_buffer = line_chars_in_buffer, 118 .flush_buffer = line_flush_buffer, 119 .flush_chars = line_flush_chars, 120 .set_termios = line_set_termios, 121 .ioctl = line_ioctl, 122 .throttle = line_throttle, 123 .unthrottle = line_unthrottle, 124 }; 125 126 static void uml_console_write(struct console *console, const char *string, 127 unsigned len) 128 { 129 struct line *line = &vts[console->index]; 130 unsigned long flags; 131 132 spin_lock_irqsave(&line->lock, flags); 133 console_write_chan(&line->chan_list, string, len); 134 spin_unlock_irqrestore(&line->lock, flags); 135 } 136 137 static struct tty_driver *uml_console_device(struct console *c, int *index) 138 { 139 *index = c->index; 140 return console_driver; 141 } 142 143 static int uml_console_setup(struct console *co, char *options) 144 { 145 struct line *line = &vts[co->index]; 146 147 return console_open_chan(line, co, &opts); 148 } 149 150 static struct console stdiocons = { 151 .name = "tty", 152 .write = uml_console_write, 153 .device = uml_console_device, 154 .setup = uml_console_setup, 155 .flags = CON_PRINTBUFFER, 156 .index = -1, 157 .data = &vts, 158 }; 159 160 int stdio_init(void) 161 { 162 char *new_title; 163 164 console_driver = line_register_devfs(&console_lines, &driver, 165 &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 lines_init(vts, ARRAY_SIZE(vts), &opts); 172 173 new_title = add_xterm_umid(opts.xterm_title); 174 if(new_title != NULL) 175 opts.xterm_title = new_title; 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