1 /* 2 * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com) 3 * Licensed under the GPL 4 */ 5 6 #include "linux/config.h" 7 #include "linux/posix_types.h" 8 #include "linux/tty.h" 9 #include "linux/tty_flip.h" 10 #include "linux/types.h" 11 #include "linux/major.h" 12 #include "linux/kdev_t.h" 13 #include "linux/console.h" 14 #include "linux/string.h" 15 #include "linux/sched.h" 16 #include "linux/list.h" 17 #include "linux/init.h" 18 #include "linux/interrupt.h" 19 #include "linux/slab.h" 20 #include "linux/hardirq.h" 21 #include "asm/current.h" 22 #include "asm/irq.h" 23 #include "stdio_console.h" 24 #include "line.h" 25 #include "chan_kern.h" 26 #include "user_util.h" 27 #include "kern_util.h" 28 #include "irq_user.h" 29 #include "mconsole_kern.h" 30 #include "init.h" 31 32 #define MAX_TTYS (16) 33 34 /* ----------------------------------------------------------------------------- */ 35 36 /* Referenced only by tty_driver below - presumably it's locked correctly 37 * by the tty driver. 38 */ 39 40 static struct tty_driver *console_driver; 41 42 void stdio_announce(char *dev_name, int dev) 43 { 44 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev, 45 dev_name); 46 } 47 48 static struct chan_opts opts = { 49 .announce = stdio_announce, 50 .xterm_title = "Virtual Console #%d", 51 .raw = 1, 52 .tramp_stack = 0, 53 .in_kernel = 1, 54 }; 55 56 static int con_config(char *str); 57 static int con_get_config(char *dev, char *str, int size, char **error_out); 58 static int con_remove(int n); 59 60 static struct line_driver driver = { 61 .name = "UML console", 62 .device_name = "tty", 63 .devfs_name = "vc/", 64 .major = TTY_MAJOR, 65 .minor_start = 0, 66 .type = TTY_DRIVER_TYPE_CONSOLE, 67 .subtype = SYSTEM_TYPE_CONSOLE, 68 .read_irq = CONSOLE_IRQ, 69 .read_irq_name = "console", 70 .write_irq = CONSOLE_WRITE_IRQ, 71 .write_irq_name = "console-write", 72 .symlink_from = "ttys", 73 .symlink_to = "vc", 74 .mc = { 75 .name = "con", 76 .config = con_config, 77 .get_config = con_get_config, 78 .id = line_id, 79 .remove = con_remove, 80 }, 81 }; 82 83 static struct lines console_lines = LINES_INIT(MAX_TTYS); 84 85 /* The array is initialized by line_init, which is an initcall. The 86 * individual elements are protected by individual semaphores. 87 */ 88 struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver), 89 [ 1 ... MAX_TTYS - 1 ] = 90 LINE_INIT(CONFIG_CON_CHAN, &driver) }; 91 92 static int con_config(char *str) 93 { 94 return line_config(vts, ARRAY_SIZE(vts), str, &opts); 95 } 96 97 static int con_get_config(char *dev, char *str, int size, char **error_out) 98 { 99 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out); 100 } 101 102 static int con_remove(int n) 103 { 104 return line_remove(vts, ARRAY_SIZE(vts), n); 105 } 106 107 static int con_open(struct tty_struct *tty, struct file *filp) 108 { 109 return line_open(vts, tty); 110 } 111 112 static int con_init_done = 0; 113 114 static struct tty_operations console_ops = { 115 .open = con_open, 116 .close = line_close, 117 .write = line_write, 118 .put_char = line_put_char, 119 .write_room = line_write_room, 120 .chars_in_buffer = line_chars_in_buffer, 121 .flush_buffer = line_flush_buffer, 122 .flush_chars = line_flush_chars, 123 .set_termios = line_set_termios, 124 .ioctl = line_ioctl, 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, &opts); 149 } 150 151 static struct console stdiocons = { 152 .name = "tty", 153 .write = uml_console_write, 154 .device = uml_console_device, 155 .setup = uml_console_setup, 156 .flags = CON_PRINTBUFFER, 157 .index = -1, 158 .data = &vts, 159 }; 160 161 int stdio_init(void) 162 { 163 char *new_title; 164 165 console_driver = line_register_devfs(&console_lines, &driver, 166 &console_ops, vts, 167 ARRAY_SIZE(vts)); 168 if (console_driver == NULL) 169 return -1; 170 printk(KERN_INFO "Initialized stdio console driver\n"); 171 172 lines_init(vts, ARRAY_SIZE(vts), &opts); 173 174 new_title = add_xterm_umid(opts.xterm_title); 175 if(new_title != NULL) 176 opts.xterm_title = new_title; 177 178 con_init_done = 1; 179 register_console(&stdiocons); 180 return 0; 181 } 182 late_initcall(stdio_init); 183 184 static void console_exit(void) 185 { 186 if (!con_init_done) 187 return; 188 close_lines(vts, ARRAY_SIZE(vts)); 189 } 190 __uml_exitcall(console_exit); 191 192 static int console_chan_setup(char *str) 193 { 194 return line_setup(vts, ARRAY_SIZE(vts), str); 195 } 196 __setup("con", console_chan_setup); 197 __channel_help(console_chan_setup, "con"); 198