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 "kern_util.h" 26 #include "irq_user.h" 27 #include "mconsole_kern.h" 28 #include "init.h" 29 30 #define MAX_TTYS (16) 31 32 /* Referenced only by tty_driver below - presumably it's locked correctly 33 * by the tty driver. 34 */ 35 36 static struct tty_driver *console_driver; 37 38 void stdio_announce(char *dev_name, int dev) 39 { 40 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev, 41 dev_name); 42 } 43 44 /* Almost const, except that xterm_title may be changed in an initcall */ 45 static struct chan_opts opts = { 46 .announce = stdio_announce, 47 .xterm_title = "Virtual Console #%d", 48 .raw = 1, 49 }; 50 51 static int con_config(char *str, char **error_out); 52 static int con_get_config(char *dev, char *str, int size, char **error_out); 53 static int con_remove(int n, char **con_remove); 54 55 56 /* Const, except for .mc.list */ 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 .mc = { 69 .list = LIST_HEAD_INIT(driver.mc.list), 70 .name = "con", 71 .config = con_config, 72 .get_config = con_get_config, 73 .id = line_id, 74 .remove = con_remove, 75 }, 76 }; 77 78 /* The array is initialized by line_init, at initcall time. The 79 * elements are locked individually as needed. 80 */ 81 static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver), 82 [ 1 ... MAX_TTYS - 1 ] = 83 LINE_INIT(CONFIG_CON_CHAN, &driver) }; 84 85 static int con_config(char *str, char **error_out) 86 { 87 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out); 88 } 89 90 static int con_get_config(char *dev, char *str, int size, char **error_out) 91 { 92 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out); 93 } 94 95 static int con_remove(int n, char **error_out) 96 { 97 return line_remove(vts, ARRAY_SIZE(vts), n, error_out); 98 } 99 100 static int con_open(struct tty_struct *tty, struct file *filp) 101 { 102 int err = line_open(vts, tty); 103 if (err) 104 printk(KERN_ERR "Failed to open console %d, err = %d\n", 105 tty->index, err); 106 107 return err; 108 } 109 110 /* Set in an initcall, checked in an exitcall */ 111 static int con_init_done = 0; 112 113 static const struct tty_operations console_ops = { 114 .open = con_open, 115 .close = line_close, 116 .write = line_write, 117 .put_char = line_put_char, 118 .write_room = line_write_room, 119 .chars_in_buffer = line_chars_in_buffer, 120 .flush_buffer = line_flush_buffer, 121 .flush_chars = line_flush_chars, 122 .set_termios = line_set_termios, 123 .ioctl = line_ioctl, 124 .throttle = line_throttle, 125 .unthrottle = line_unthrottle, 126 }; 127 128 static void uml_console_write(struct console *console, const char *string, 129 unsigned len) 130 { 131 struct line *line = &vts[console->index]; 132 unsigned long flags; 133 134 spin_lock_irqsave(&line->lock, flags); 135 console_write_chan(&line->chan_list, string, len); 136 spin_unlock_irqrestore(&line->lock, flags); 137 } 138 139 static struct tty_driver *uml_console_device(struct console *c, int *index) 140 { 141 *index = c->index; 142 return console_driver; 143 } 144 145 static int uml_console_setup(struct console *co, char *options) 146 { 147 struct line *line = &vts[co->index]; 148 149 return console_open_chan(line, co); 150 } 151 152 /* No locking for register_console call - relies on single-threaded initcalls */ 153 static struct console stdiocons = { 154 .name = "tty", 155 .write = uml_console_write, 156 .device = uml_console_device, 157 .setup = uml_console_setup, 158 .flags = CON_PRINTBUFFER|CON_ANYTIME, 159 .index = -1, 160 }; 161 162 int stdio_init(void) 163 { 164 char *new_title; 165 166 console_driver = register_lines(&driver, &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 new_title = add_xterm_umid(opts.xterm_title); 173 if(new_title != NULL) 174 opts.xterm_title = new_title; 175 176 lines_init(vts, ARRAY_SIZE(vts), &opts); 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 char *error; 195 int ret; 196 197 ret = line_setup(vts, ARRAY_SIZE(vts), str, &error); 198 if(ret < 0) 199 printk(KERN_ERR "Failed to set up console with " 200 "configuration string \"%s\" : %s\n", str, error); 201 202 return 1; 203 } 204 __setup("con", console_chan_setup); 205 __channel_help(console_chan_setup, "con"); 206