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Abstract the different I/O Port permission methods in own functions. Change-Id: If4b2f8c2532f3732086ee1d479da6ae6693f9a42 Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com> Reviewed-on: https://review.coreboot.org/c/flashrom/+/61275 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Edward O'Callaghan <quasisec@chromium.org> Reviewed-by: Nico Huber <nico.h@gmx.de> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/*
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* This file is part of the flashrom project.
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*
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* Copyright (C) 2009,2010 Carl-Daniel Hailfinger
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* Copyright (C) 2022 secunet Security Networks AG
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* (Written by Thomas Heijligen <thomas.heijligen@secunet.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/*
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* This file implements x86 I/O port permission handling.
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*
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* For this purpose the platform specific code is encapsuled in two functions
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* and compiled only on the respective platform. `platform_get_io_perms()` is
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* called to get the permissions and `platform_release_io_perms()` is called for
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* releasing those.
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*/
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#include <errno.h>
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#include <string.h>
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#include "flash.h"
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#include "hwaccess_x86_io.h"
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#if defined(__DJGPP__) || defined(__LIBPAYLOAD) /* DJGPP, libpayload */
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static int platform_get_io_perms(void)
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{
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return 0;
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}
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static int platform_release_io_perms(void *p)
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{
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return 0;
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}
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#endif
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#if defined(__sun) /* SunOS */
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#include <sys/sysi86.h>
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static int platform_get_io_perms(void)
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{
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return sysi86(SI86V86, V86SC_IOPL, PS_IOPL);
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}
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static int platform_release_io_perms(void *p)
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{
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sysi86(SI86V86, V86SC_IOPL, 0);
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return 0;
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}
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#endif
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#if USE_DEV_IO /* FreeBSD, DragonFlyBSD */
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#include <fcntl.h>
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#include <unistd.h>
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int io_fd;
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static int platform_get_io_perms(void)
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{
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io_fd = open("/dev/io", O_RDWR);
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return (io_fd >= 0 ? 0 : -1);
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}
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static int platform_release_io_perms(void *p)
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{
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close(io_fd);
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return 0;
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}
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#endif
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#if USE_IOPERM /* GNU Hurd */
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#include <sys/io.h>
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static int platform_get_io_perms(void)
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{
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return ioperm(0, 65536, 1);
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}
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static int platform_release_io_perms(void *p)
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{
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ioperm(0, 65536, 0);
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return 0;
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}
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#endif
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#if USE_IOPL /* Linux, Darwin, NetBSD, OpenBSD */
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static int platform_get_io_perms(void)
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{
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return iopl(3);
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}
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static int platform_release_io_perms(void *p)
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{
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iopl(0);
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return 0;
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}
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#endif
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/**
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* @brief Get access to the x86 I/O ports
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*
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* This function abstracts the platform dependent function to get access to the
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* x86 I/O ports and musst be called before using IN[B/W/L] or OUT[B/W/L].
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* It registers a shutdown function to release those privileges.
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*
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* @return 0 on success, platform specific number on failure
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*/
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int rget_io_perms(void)
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{
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if (platform_get_io_perms() == 0) {
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register_shutdown(platform_release_io_perms, NULL);
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return 0;
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}
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msg_perr("ERROR: Could not get I/O privileges (%s).\n", strerror(errno));
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msg_perr("Make sure you are root. If you are root, your kernel may still\n"
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"prevent access based on security policies.\n");
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msg_perr("On OpenBSD set securelevel=-1 in /etc/rc.securelevel and\n"
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"reboot, or reboot into single user mode.\n");
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msg_perr("On NetBSD reboot into single user mode or make sure\n"
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"that your kernel configuration has the option INSECURE enabled.\n");
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return 1;
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}
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