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 "chan.h" 24 #include "irq_user.h" 25 #include "mconsole_kern.h" 26 #include "init.h" 27 28 #define MAX_TTYS (16) 29 30 static void stdio_announce(char *dev_name, int dev) 31 { 32 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev, 33 dev_name); 34 } 35 36 /* Almost const, except that xterm_title may be changed in an initcall */ 37 static struct chan_opts opts = { 38 .announce = stdio_announce, 39 .xterm_title = "Virtual Console #%d", 40 .raw = 1, 41 }; 42 43 static int con_config(char *str, char **error_out); 44 static int con_get_config(char *dev, char *str, int size, char **error_out); 45 static int con_remove(int n, char **con_remove); 46 47 48 /* Const, except for .mc.list */ 49 static struct line_driver driver = { 50 .name = "UML console", 51 .device_name = "tty", 52 .major = TTY_MAJOR, 53 .minor_start = 0, 54 .type = TTY_DRIVER_TYPE_CONSOLE, 55 .subtype = SYSTEM_TYPE_CONSOLE, 56 .read_irq = CONSOLE_IRQ, 57 .read_irq_name = "console", 58 .write_irq = CONSOLE_WRITE_IRQ, 59 .write_irq_name = "console-write", 60 .mc = { 61 .list = LIST_HEAD_INIT(driver.mc.list), 62 .name = "con", 63 .config = con_config, 64 .get_config = con_get_config, 65 .id = line_id, 66 .remove = con_remove, 67 }, 68 }; 69 70 /* The array is initialized by line_init, at initcall time. The 71 * elements are locked individually as needed. 72 */ 73 static char *vt_conf[MAX_TTYS]; 74 static char *def_conf; 75 static struct line vts[MAX_TTYS]; 76 77 static int con_config(char *str, char **error_out) 78 { 79 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out); 80 } 81 82 static int con_get_config(char *dev, char *str, int size, char **error_out) 83 { 84 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out); 85 } 86 87 static int con_remove(int n, char **error_out) 88 { 89 return line_remove(vts, ARRAY_SIZE(vts), n, error_out); 90 } 91 92 static int con_open(struct tty_struct *tty, struct file *filp) 93 { 94 int err = line_open(vts, tty); 95 if (err) 96 printk(KERN_ERR "Failed to open console %d, err = %d\n", 97 tty->index, err); 98 99 return err; 100 } 101 102 /* Set in an initcall, checked in an exitcall */ 103 static int con_init_done = 0; 104 105 static const struct tty_operations console_ops = { 106 .open = con_open, 107 .close = line_close, 108 .write = line_write, 109 .put_char = line_put_char, 110 .write_room = line_write_room, 111 .chars_in_buffer = line_chars_in_buffer, 112 .flush_buffer = line_flush_buffer, 113 .flush_chars = line_flush_chars, 114 .set_termios = line_set_termios, 115 .ioctl = line_ioctl, 116 .throttle = line_throttle, 117 .unthrottle = line_unthrottle, 118 }; 119 120 static void uml_console_write(struct console *console, const char *string, 121 unsigned len) 122 { 123 struct line *line = &vts[console->index]; 124 unsigned long flags; 125 126 spin_lock_irqsave(&line->lock, flags); 127 console_write_chan(line->chan_out, string, len); 128 spin_unlock_irqrestore(&line->lock, flags); 129 } 130 131 static struct tty_driver *uml_console_device(struct console *c, int *index) 132 { 133 *index = c->index; 134 return driver.driver; 135 } 136 137 static int uml_console_setup(struct console *co, char *options) 138 { 139 struct line *line = &vts[co->index]; 140 141 return console_open_chan(line, co); 142 } 143 144 /* No locking for register_console call - relies on single-threaded initcalls */ 145 static struct console stdiocons = { 146 .name = "tty", 147 .write = uml_console_write, 148 .device = uml_console_device, 149 .setup = uml_console_setup, 150 .flags = CON_PRINTBUFFER|CON_ANYTIME, 151 .index = -1, 152 }; 153 154 static int stdio_init(void) 155 { 156 char *new_title; 157 int err; 158 int i; 159 160 err = register_lines(&driver, &console_ops, vts, 161 ARRAY_SIZE(vts)); 162 if (err) 163 return err; 164 165 printk(KERN_INFO "Initialized stdio console driver\n"); 166 167 new_title = add_xterm_umid(opts.xterm_title); 168 if(new_title != NULL) 169 opts.xterm_title = new_title; 170 171 for (i = 0; i < MAX_TTYS; i++) { 172 char *error; 173 char *s = vt_conf[i]; 174 if (!s) 175 s = def_conf; 176 if (!s) 177 s = i ? CONFIG_CON_CHAN : CONFIG_CON_ZERO_CHAN; 178 if (setup_one_line(vts, i, s, &opts, &error)) 179 printk(KERN_ERR "setup_one_line failed for " 180 "device %d : %s\n", i, error); 181 } 182 183 con_init_done = 1; 184 register_console(&stdiocons); 185 return 0; 186 } 187 late_initcall(stdio_init); 188 189 static void console_exit(void) 190 { 191 if (!con_init_done) 192 return; 193 close_lines(vts, ARRAY_SIZE(vts)); 194 } 195 __uml_exitcall(console_exit); 196 197 static int console_chan_setup(char *str) 198 { 199 line_setup(vt_conf, MAX_TTYS, &def_conf, str, "console"); 200 return 1; 201 } 202 __setup("con", console_chan_setup); 203 __channel_help(console_chan_setup, "con"); 204