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![Johannes Berg](/assets/img/avatar_default.png)
In some cases, for example when the program(s) running inside UML isn't/aren't interactive (like the hwsim tests for wpa_supplicant) there's really no value in having the serial lines configured to be raw as they are now by default. Setting them to non-raw lets one abort the whole UML with Ctrl-C, which is really the right thing to do in these cases, basically the whole UML instance is more like a single (testing) program. Add a "ssl-non-raw" option to UML to support such a mode. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at>
206 lines
4.9 KiB
C
206 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
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*/
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#include <linux/fs.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/major.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <asm/termbits.h>
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#include <asm/irq.h>
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#include "chan.h"
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#include <init.h>
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#include <irq_user.h>
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#include "mconsole_kern.h"
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static const int ssl_version = 1;
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#define NR_PORTS 64
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static void ssl_announce(char *dev_name, int dev)
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{
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printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
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dev_name);
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}
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/* Almost const, except that xterm_title may be changed in an initcall */
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static struct chan_opts opts = {
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.announce = ssl_announce,
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.xterm_title = "Serial Line #%d",
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.raw = 1,
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};
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static int ssl_config(char *str, char **error_out);
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static int ssl_get_config(char *dev, char *str, int size, char **error_out);
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static int ssl_remove(int n, char **error_out);
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/* Const, except for .mc.list */
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static struct line_driver driver = {
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.name = "UML serial line",
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.device_name = "ttyS",
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.major = TTY_MAJOR,
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.minor_start = 64,
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.type = TTY_DRIVER_TYPE_SERIAL,
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.subtype = 0,
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.read_irq = SSL_IRQ,
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.read_irq_name = "ssl",
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.write_irq = SSL_WRITE_IRQ,
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.write_irq_name = "ssl-write",
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.mc = {
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.list = LIST_HEAD_INIT(driver.mc.list),
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.name = "ssl",
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.config = ssl_config,
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.get_config = ssl_get_config,
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.id = line_id,
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.remove = ssl_remove,
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},
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};
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/* The array is initialized by line_init, at initcall time. The
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* elements are locked individually as needed.
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*/
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static char *conf[NR_PORTS];
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static char *def_conf = CONFIG_SSL_CHAN;
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static struct line serial_lines[NR_PORTS];
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static int ssl_config(char *str, char **error_out)
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{
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return line_config(serial_lines, ARRAY_SIZE(serial_lines), str, &opts,
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error_out);
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}
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static int ssl_get_config(char *dev, char *str, int size, char **error_out)
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{
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return line_get_config(dev, serial_lines, ARRAY_SIZE(serial_lines), str,
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size, error_out);
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}
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static int ssl_remove(int n, char **error_out)
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{
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return line_remove(serial_lines, ARRAY_SIZE(serial_lines), n,
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error_out);
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}
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static int ssl_install(struct tty_driver *driver, struct tty_struct *tty)
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{
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return line_install(driver, tty, &serial_lines[tty->index]);
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}
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static const struct tty_operations ssl_ops = {
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.open = line_open,
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.close = line_close,
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.write = line_write,
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.put_char = line_put_char,
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.write_room = line_write_room,
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.chars_in_buffer = line_chars_in_buffer,
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.flush_buffer = line_flush_buffer,
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.flush_chars = line_flush_chars,
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.set_termios = line_set_termios,
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.throttle = line_throttle,
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.unthrottle = line_unthrottle,
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.install = ssl_install,
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.hangup = line_hangup,
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};
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/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
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* by being an initcall and exitcall, respectively.
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*/
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static int ssl_init_done = 0;
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static void ssl_console_write(struct console *c, const char *string,
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unsigned len)
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{
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struct line *line = &serial_lines[c->index];
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unsigned long flags;
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spin_lock_irqsave(&line->lock, flags);
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console_write_chan(line->chan_out, string, len);
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spin_unlock_irqrestore(&line->lock, flags);
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}
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static struct tty_driver *ssl_console_device(struct console *c, int *index)
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{
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*index = c->index;
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return driver.driver;
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}
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static int ssl_console_setup(struct console *co, char *options)
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{
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struct line *line = &serial_lines[co->index];
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return console_open_chan(line, co);
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}
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/* No locking for register_console call - relies on single-threaded initcalls */
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static struct console ssl_cons = {
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.name = "ttyS",
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.write = ssl_console_write,
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.device = ssl_console_device,
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.setup = ssl_console_setup,
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.flags = CON_PRINTBUFFER|CON_ANYTIME,
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.index = -1,
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};
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static int ssl_init(void)
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{
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char *new_title;
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int err;
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int i;
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printk(KERN_INFO "Initializing software serial port version %d\n",
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ssl_version);
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err = register_lines(&driver, &ssl_ops, serial_lines,
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ARRAY_SIZE(serial_lines));
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if (err)
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return err;
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new_title = add_xterm_umid(opts.xterm_title);
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if (new_title != NULL)
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opts.xterm_title = new_title;
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for (i = 0; i < NR_PORTS; i++) {
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char *error;
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char *s = conf[i];
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if (!s)
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s = def_conf;
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if (setup_one_line(serial_lines, i, s, &opts, &error))
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printk(KERN_ERR "setup_one_line failed for "
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"device %d : %s\n", i, error);
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}
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ssl_init_done = 1;
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register_console(&ssl_cons);
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return 0;
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}
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late_initcall(ssl_init);
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static void ssl_exit(void)
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{
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if (!ssl_init_done)
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return;
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close_lines(serial_lines, ARRAY_SIZE(serial_lines));
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}
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__uml_exitcall(ssl_exit);
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static int ssl_chan_setup(char *str)
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{
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line_setup(conf, NR_PORTS, &def_conf, str, "serial line");
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return 1;
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}
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__setup("ssl", ssl_chan_setup);
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__channel_help(ssl_chan_setup, "ssl");
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static int ssl_non_raw_setup(char *str)
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{
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opts.raw = 0;
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return 1;
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}
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__setup("ssl-non-raw", ssl_non_raw_setup);
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__channel_help(ssl_non_raw_setup, "set serial lines to non-raw mode");
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