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