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/*
* Copyright (C) 2010 Piotr Jaroszyński <p.jaroszynski@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
FILE_LICENCE(GPL2_OR_LATER);
/** @file
*
* Linux console implementation.
*
*/
#include <ipxe/console.h>
#include <ipxe/init.h>
#include <ipxe/keys.h>
#include <linux_api.h>
#include <linux/termios.h>
#include <asm/errno.h>
#include <config/console.h>
/* Set default console usage if applicable */
#if ! ( defined ( CONSOLE_LINUX ) && CONSOLE_EXPLICIT ( CONSOLE_LINUX ) )
#undef CONSOLE_LINUX
#define CONSOLE_LINUX ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )
#endif
static void linux_console_putchar(int c)
{
/* write to stdout */
if (linux_write(1, &c, 1) != 1)
DBG("linux_console write failed (%s)\n", linux_strerror(linux_errno));
}
static int linux_console_getchar()
{
char c;
/* read from stdin */
if (linux_read(0, &c, 1) < 0) {
DBG("linux_console read failed (%s)\n", linux_strerror(linux_errno));
return 0;
}
/* backspace seems to be returned as ascii del, map it here */
if (c == 0x7f)
return KEY_BACKSPACE;
else
return c;
}
static int linux_console_iskey()
{
struct pollfd pfd;
pfd.fd = 0;
pfd.events = POLLIN;
/* poll for data to be read on stdin */
if (linux_poll(&pfd, 1, 0) == -1) {
DBG("linux_console poll failed (%s)\n", linux_strerror(linux_errno));
return 0;
}
if (pfd.revents & POLLIN)
return 1;
else
return 0;
}
struct console_driver linux_console __console_driver = {
.disabled = 0,
.putchar = linux_console_putchar,
.getchar = linux_console_getchar,
.iskey = linux_console_iskey,
.usage = CONSOLE_LINUX,
};
static int linux_tcgetattr(int fd, struct termios *termios_p)
{
return linux_ioctl(fd, TCGETS, termios_p);
}
static int linux_tcsetattr(int fd, int optional_actions, const struct termios *termios_p)
{
unsigned long int cmd;
switch (optional_actions)
{
case TCSANOW:
cmd = TCSETS;
break;
case TCSADRAIN:
cmd = TCSETSW;
break;
case TCSAFLUSH:
cmd = TCSETSF;
break;
default:
linux_errno = EINVAL;
return -1;
}
return linux_ioctl(fd, cmd, termios_p);
}
/** Saved termios attributes */
static struct termios saved_termios;
/** Setup the terminal for our use */
static void linux_console_startup(void)
{
struct termios t;
if (linux_tcgetattr(0, &t)) {
DBG("linux_console tcgetattr failed (%s)", linux_strerror(linux_errno));
return;
}
saved_termios = t;
/* Disable canonical mode and echo. Let readline handle that */
t.c_lflag &= ~(ECHO | ICANON);
/* stop ^C from sending a signal */
t.c_cc[VINTR] = 0;
if (linux_tcsetattr(0, TCSAFLUSH, &t))
DBG("linux_console tcsetattr failed (%s)", linux_strerror(linux_errno));
}
/** Restores original terminal attributes on shutdown */
static void linux_console_shutdown(int flags __unused)
{
if (linux_tcsetattr(0, TCSAFLUSH, &saved_termios))
DBG("linux_console tcsetattr failed (%s)", linux_strerror(linux_errno));
}
struct startup_fn linux_console_startup_fn __startup_fn(STARTUP_EARLY) = {
.startup = linux_console_startup,
.shutdown = linux_console_shutdown,
};
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