mirror of
https://github.com/ipxe/ipxe
synced 2026-02-03 22:49:29 +03:00
f309d7a7b7
When building as a Linux userspace application, iPXE currently implements its own system calls to the host kernel rather than relying on the host's C library. The output binary is statically linked and has no external dependencies. This matches the general philosophy of other platforms on which iPXE runs, since there are no external libraries available on either BIOS or UEFI bare metal. However, it would be useful for the Linux userspace application to be able to link against host libraries such as libslirp. Modify the build process to perform a two-stage link: first picking out the requested objects in the usual way from blib.a but with relocations left present, then linking again with a helper object to create a standard hosted application. The helper object provides the standard main() entry point and wrappers for the Linux system calls required by the iPXE Linux drivers and interface code. Signed-off-by: Michael Brown <mcb30@ipxe.org>
157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*
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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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FILE_LICENCE(GPL2_OR_LATER);
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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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#include <ipxe/console.h>
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#include <ipxe/init.h>
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#include <ipxe/keys.h>
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#include <ipxe/linux_api.h>
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#include <linux/termios.h>
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#include <asm/errno.h>
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#include <config/console.h>
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/* Set default console usage if applicable */
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#if ! ( defined ( CONSOLE_LINUX ) && CONSOLE_EXPLICIT ( CONSOLE_LINUX ) )
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#undef CONSOLE_LINUX
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#define CONSOLE_LINUX ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )
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#endif
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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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static int linux_console_getchar()
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{
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char c;
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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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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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/* 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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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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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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.usage = CONSOLE_LINUX,
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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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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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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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return linux_ioctl(fd, cmd, termios_p);
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}
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/** Saved termios attributes */
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static struct termios saved_termios;
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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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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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saved_termios = t;
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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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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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/** 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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struct startup_fn linux_console_startup_fn __startup_fn(STARTUP_EARLY) = {
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.name = "linux_console",
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.startup = linux_console_startup,
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.shutdown = linux_console_shutdown,
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};
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