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 #include "2_5compat.h" 32 33 #define MAX_TTYS (16) 34 35 /* ----------------------------------------------------------------------------- */ 36 37 /* Referenced only by tty_driver below - presumably it's locked correctly 38 * by the tty driver. 39 */ 40 41 static struct tty_driver *console_driver; 42 43 void stdio_announce(char *dev_name, int dev) 44 { 45 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev, 46 dev_name); 47 } 48 49 static struct chan_opts opts = { 50 .announce = stdio_announce, 51 .xterm_title = "Virtual Console #%d", 52 .raw = 1, 53 .tramp_stack = 0, 54 .in_kernel = 1, 55 }; 56 57 static int con_config(char *str); 58 static int con_get_config(char *dev, char *str, int size, char **error_out); 59 static int con_remove(char *str); 60 61 static struct line_driver driver = { 62 .name = "UML console", 63 .device_name = "tty", 64 .devfs_name = "vc/", 65 .major = TTY_MAJOR, 66 .minor_start = 0, 67 .type = TTY_DRIVER_TYPE_CONSOLE, 68 .subtype = SYSTEM_TYPE_CONSOLE, 69 .read_irq = CONSOLE_IRQ, 70 .read_irq_name = "console", 71 .write_irq = CONSOLE_WRITE_IRQ, 72 .write_irq_name = "console-write", 73 .symlink_from = "ttys", 74 .symlink_to = "vc", 75 .mc = { 76 .name = "con", 77 .config = con_config, 78 .get_config = con_get_config, 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, sizeof(vts)/sizeof(vts[0]), str)); 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, sizeof(vts)/sizeof(vts[0]), str, 100 size, error_out)); 101 } 102 103 static int con_remove(char *str) 104 { 105 return(line_remove(vts, sizeof(vts)/sizeof(vts[0]), str)); 106 } 107 108 static int con_open(struct tty_struct *tty, struct file *filp) 109 { 110 return line_open(vts, tty, &opts); 111 } 112 113 static int con_init_done = 0; 114 115 static struct tty_operations console_ops = { 116 .open = con_open, 117 .close = line_close, 118 .write = line_write, 119 .write_room = line_write_room, 120 .chars_in_buffer = line_chars_in_buffer, 121 .set_termios = line_set_termios, 122 .ioctl = line_ioctl, 123 }; 124 125 static void uml_console_write(struct console *console, const char *string, 126 unsigned len) 127 { 128 struct line *line = &vts[console->index]; 129 130 down(&line->sem); 131 console_write_chan(&line->chan_list, string, len); 132 up(&line->sem); 133 } 134 135 static struct tty_driver *uml_console_device(struct console *c, int *index) 136 { 137 *index = c->index; 138 return console_driver; 139 } 140 141 static int uml_console_setup(struct console *co, char *options) 142 { 143 struct line *line = &vts[co->index]; 144 145 return console_open_chan(line,co,&opts); 146 } 147 148 static struct console stdiocons = { 149 .name = "tty", 150 .write = uml_console_write, 151 .device = uml_console_device, 152 .setup = uml_console_setup, 153 .flags = CON_PRINTBUFFER, 154 .index = -1, 155 .data = &vts, 156 }; 157 158 int stdio_init(void) 159 { 160 char *new_title; 161 162 console_driver = line_register_devfs(&console_lines, &driver, 163 &console_ops, vts, 164 ARRAY_SIZE(vts)); 165 if (NULL == console_driver) 166 return -1; 167 printk(KERN_INFO "Initialized stdio console driver\n"); 168 169 lines_init(vts, sizeof(vts)/sizeof(vts[0])); 170 171 new_title = add_xterm_umid(opts.xterm_title); 172 if(new_title != NULL) 173 opts.xterm_title = new_title; 174 175 con_init_done = 1; 176 register_console(&stdiocons); 177 return(0); 178 } 179 late_initcall(stdio_init); 180 181 static void console_exit(void) 182 { 183 if (!con_init_done) 184 return; 185 close_lines(vts, sizeof(vts)/sizeof(vts[0])); 186 } 187 __uml_exitcall(console_exit); 188 189 static int console_chan_setup(char *str) 190 { 191 return(line_setup(vts, sizeof(vts)/sizeof(vts[0]), str, 1)); 192 } 193 __setup("con", console_chan_setup); 194 __channel_help(console_chan_setup, "con"); 195 196 /* 197 * Overrides for Emacs so that we follow Linus's tabbing style. 198 * Emacs will notice this stuff at the end of the file and automatically 199 * adjust the settings for this buffer only. This must remain at the end 200 * of the file. 201 * --------------------------------------------------------------------------- 202 * Local variables: 203 * c-file-style: "linux" 204 * End: 205 */ 206