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 .tramp_stack = 0, 50 .in_kernel = 1, 51 }; 52 53 static int con_config(char *str, char **error_out); 54 static int con_get_config(char *dev, char *str, int size, char **error_out); 55 static int con_remove(int n, char **con_remove); 56 57 58 /* Const, except for .mc.list */ 59 static struct line_driver driver = { 60 .name = "UML console", 61 .device_name = "tty", 62 .major = TTY_MAJOR, 63 .minor_start = 0, 64 .type = TTY_DRIVER_TYPE_CONSOLE, 65 .subtype = SYSTEM_TYPE_CONSOLE, 66 .read_irq = CONSOLE_IRQ, 67 .read_irq_name = "console", 68 .write_irq = CONSOLE_WRITE_IRQ, 69 .write_irq_name = "console-write", 70 .mc = { 71 .list = LIST_HEAD_INIT(driver.mc.list), 72 .name = "con", 73 .config = con_config, 74 .get_config = con_get_config, 75 .id = line_id, 76 .remove = con_remove, 77 }, 78 }; 79 80 /* The array is initialized by line_init, at initcall time. The 81 * elements are locked individually as needed. 82 */ 83 static struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver), 84 [ 1 ... MAX_TTYS - 1 ] = 85 LINE_INIT(CONFIG_CON_CHAN, &driver) }; 86 87 static int con_config(char *str, char **error_out) 88 { 89 return line_config(vts, ARRAY_SIZE(vts), str, &opts, error_out); 90 } 91 92 static int con_get_config(char *dev, char *str, int size, char **error_out) 93 { 94 return line_get_config(dev, vts, ARRAY_SIZE(vts), str, size, error_out); 95 } 96 97 static int con_remove(int n, char **error_out) 98 { 99 return line_remove(vts, ARRAY_SIZE(vts), n, error_out); 100 } 101 102 static int con_open(struct tty_struct *tty, struct file *filp) 103 { 104 return line_open(vts, tty); 105 } 106 107 /* Set in an initcall, checked in an exitcall */ 108 static int con_init_done = 0; 109 110 static const struct tty_operations console_ops = { 111 .open = con_open, 112 .close = line_close, 113 .write = line_write, 114 .put_char = line_put_char, 115 .write_room = line_write_room, 116 .chars_in_buffer = line_chars_in_buffer, 117 .flush_buffer = line_flush_buffer, 118 .flush_chars = line_flush_chars, 119 .set_termios = line_set_termios, 120 .ioctl = line_ioctl, 121 .throttle = line_throttle, 122 .unthrottle = line_unthrottle, 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 unsigned long flags; 130 131 spin_lock_irqsave(&line->lock, flags); 132 console_write_chan(&line->chan_list, string, len); 133 spin_unlock_irqrestore(&line->lock, flags); 134 } 135 136 static struct tty_driver *uml_console_device(struct console *c, int *index) 137 { 138 *index = c->index; 139 return console_driver; 140 } 141 142 static int uml_console_setup(struct console *co, char *options) 143 { 144 struct line *line = &vts[co->index]; 145 146 return console_open_chan(line, co); 147 } 148 149 /* No locking for register_console call - relies on single-threaded initcalls */ 150 static struct console stdiocons = { 151 .name = "tty", 152 .write = uml_console_write, 153 .device = uml_console_device, 154 .setup = uml_console_setup, 155 .flags = CON_PRINTBUFFER|CON_ANYTIME, 156 .index = -1, 157 }; 158 159 int stdio_init(void) 160 { 161 char *new_title; 162 163 console_driver = register_lines(&driver, &console_ops, vts, 164 ARRAY_SIZE(vts)); 165 if (console_driver == NULL) 166 return -1; 167 printk(KERN_INFO "Initialized stdio console driver\n"); 168 169 new_title = add_xterm_umid(opts.xterm_title); 170 if(new_title != NULL) 171 opts.xterm_title = new_title; 172 173 lines_init(vts, ARRAY_SIZE(vts), &opts); 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, ARRAY_SIZE(vts)); 186 } 187 __uml_exitcall(console_exit); 188 189 static int console_chan_setup(char *str) 190 { 191 char *error; 192 int ret; 193 194 ret = line_setup(vts, ARRAY_SIZE(vts), str, &error); 195 if(ret < 0) 196 printk(KERN_ERR "Failed to set up console with " 197 "configuration string \"%s\" : %s\n", str, error); 198 199 return 1; 200 } 201 __setup("con", console_chan_setup); 202 __channel_help(console_chan_setup, "con"); 203