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 /* Referenced only by tty_driver below - presumably it's locked correctly 31 * by the tty driver. 32 */ 33 34 static struct tty_driver *console_driver; 35 36 static void stdio_announce(char *dev_name, int dev) 37 { 38 printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev, 39 dev_name); 40 } 41 42 /* Almost const, except that xterm_title may be changed in an initcall */ 43 static struct chan_opts opts = { 44 .announce = stdio_announce, 45 .xterm_title = "Virtual Console #%d", 46 .raw = 1, 47 }; 48 49 static int con_config(char *str, char **error_out); 50 static int con_get_config(char *dev, char *str, int size, char **error_out); 51 static int con_remove(int n, char **con_remove); 52 53 54 /* Const, except for .mc.list */ 55 static struct line_driver driver = { 56 .name = "UML console", 57 .device_name = "tty", 58 .major = TTY_MAJOR, 59 .minor_start = 0, 60 .type = TTY_DRIVER_TYPE_CONSOLE, 61 .subtype = SYSTEM_TYPE_CONSOLE, 62 .read_irq = CONSOLE_IRQ, 63 .read_irq_name = "console", 64 .write_irq = CONSOLE_WRITE_IRQ, 65 .write_irq_name = "console-write", 66 .mc = { 67 .list = LIST_HEAD_INIT(driver.mc.list), 68 .name = "con", 69 .config = con_config, 70 .get_config = con_get_config, 71 .id = line_id, 72 .remove = con_remove, 73 }, 74 }; 75 76 /* The array is initialized by line_init, at initcall time. The 77 * elements are locked individually as needed. 78 */ 79 static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver), 80 [ 1 ... MAX_TTYS - 1 ] = 81 LINE_INIT(CONFIG_CON_CHAN, &driver) }; 82 83 static int con_config(char *str, char **error_out) 84 { 85 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out); 86 } 87 88 static int con_get_config(char *dev, char *str, int size, char **error_out) 89 { 90 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out); 91 } 92 93 static int con_remove(int n, char **error_out) 94 { 95 return line_remove(vts, ARRAY_SIZE(vts), n, error_out); 96 } 97 98 static int con_open(struct tty_struct *tty, struct file *filp) 99 { 100 int err = line_open(vts, tty); 101 if (err) 102 printk(KERN_ERR "Failed to open console %d, err = %d\n", 103 tty->index, err); 104 105 return err; 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); 148 } 149 150 /* No locking for register_console call - relies on single-threaded initcalls */ 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|CON_ANYTIME, 157 .index = -1, 158 }; 159 160 static int stdio_init(void) 161 { 162 char *new_title; 163 164 console_driver = register_lines(&driver, &console_ops, vts, 165 ARRAY_SIZE(vts)); 166 if (console_driver == NULL) 167 return -1; 168 printk(KERN_INFO "Initialized stdio console driver\n"); 169 170 new_title = add_xterm_umid(opts.xterm_title); 171 if(new_title != NULL) 172 opts.xterm_title = new_title; 173 174 lines_init(vts, ARRAY_SIZE(vts), &opts); 175 176 con_init_done = 1; 177 register_console(&stdiocons); 178 return 0; 179 } 180 late_initcall(stdio_init); 181 182 static void console_exit(void) 183 { 184 if (!con_init_done) 185 return; 186 close_lines(vts, ARRAY_SIZE(vts)); 187 } 188 __uml_exitcall(console_exit); 189 190 static int console_chan_setup(char *str) 191 { 192 char *error; 193 int ret; 194 195 ret = line_setup(vts, ARRAY_SIZE(vts), str, &error); 196 if(ret < 0) 197 printk(KERN_ERR "Failed to set up console with " 198 "configuration string \"%s\" : %s\n", str, error); 199 200 return 1; 201 } 202 __setup("con", console_chan_setup); 203 __channel_help(console_chan_setup, "con"); 204