coreboot-kgpe-d16/util/intelmetool/msr.c

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/* intelmetool */
treewide: replace GPLv2 long form headers with SPDX header This replaces GPLv2-or-later and GPLv2-only long form text with the short SPDX identifiers. Commands used: perl -i -p0e 's|/\*[*\n\t ]*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[;,].*version.*2.*of.*the.*License.*or.*(at.*your.*option).*any.*later.*version.+This.*program.*is.*distributed.*in.*the.*hope.*that.*it.*will.*be.*useful,.*but.*;.*without.*even.*the.*implied.*warranty.*of.*MERCHANTABILITY.*or.*FITNESS.*FOR.*A.*PARTICULAR.*PURPOSE..*.*See.*the.*GNU.*General.*Public.*License for more details.[\n\t ]*\*/|/* SPDX-License-Identifier: GPL-2.0-or-later */|s' $(cat filelist) perl -i -p0e 's|/\*[*\n\t ]*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[;,].*version.*2.+This.*program.*is.*distributed.*in.*the.*hope.*that.*it.*will.*be.*useful,.*but.*;.*without.*even.*the.*implied.*warranty.*of.*MERCHANTABILITY.*or.*FITNESS.*FOR.*A.*PARTICULAR.*PURPOSE..*.*See.*the.*GNU.*General.*Public.*License for more details.[\n\t ]*\*/|/* SPDX-License-Identifier: GPL-2.0-only */|s' $(cat filelist) perl -i -p0e 's|/\*[*\n\t ]*This program is free software[:;].*you.*can.*redistribute.*it.*and/or.*modify.*it.*under.*the.*terms.*of.*the.*GNU.*General.*Public.*License.*version.*2.*as.*published.*by.*the.*Free.*Software.*Foundation[.;,].+This.*program.*is.*distributed.*in.*the.*hope.*that.*it.*will.*be.*useful,.*but.*;.*without.*even.*the.*implied.*warranty.*of.*MERCHANTABILITY.*or.*FITNESS.*FOR.*A.*PARTICULAR.*PURPOSE..*.*See.*the.*GNU.*General.*Public.*License for more details.[\n\t ]*\*/|/* SPDX-License-Identifier: GPL-2.0-only */|s' $(cat filelist) perl -i -p0e 's|/\*[*\n\t ]*This software is licensed under.*the.*terms.*of.*the.*GNU.*General.*Public.*License.*version.*2.*as.*published.*by.*the.*Free.*Software.*Foundation,.+This.*program.*is.*distributed.*in.*the.*hope.*that.*it.*will.*be.*useful,.*but.*;.*without.*even.*the.*implied.*warranty.*of.*MERCHANTABILITY.*or.*FITNESS.*FOR.*A.*PARTICULAR.*PURPOSE..*.*See.*the.*GNU.*General.*Public.*License for more details.[\n\t ]*\*/|/* SPDX-License-Identifier: GPL-2.0-only */|s' $(cat filelist) Change-Id: I7a746088a35633c11fc7ebe86006e96458a1abf8 Signed-off-by: Patrick Georgi <pgeorgi@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/41066 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: David Hendricks <david.hendricks@gmail.com> Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
2020-05-05 22:49:26 +02:00
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "msr.h"
#ifndef __DARWIN__
static int fd_msr = 0;
static int rdmsr(int addr, uint64_t *msr)
{
if (lseek(fd_msr, (off_t) addr, SEEK_SET) == -1) {
perror("Could not lseek() to MSR");
close(fd_msr);
return -1;
}
if (read(fd_msr, msr, 8) == 8) {
close(fd_msr);
return 0;
}
if (errno == EIO) {
perror("IO error couldn't read MSR.");
close(fd_msr);
/* On older platforms the MSR might not exists */
return -2;
}
perror("Couldn't read() MSR");
close(fd_msr);
return -1;
}
#endif
int msr_bootguard(uint64_t *msr)
{
#ifndef __DARWIN__
fd_msr = open("/dev/cpu/0/msr", O_RDONLY);
if (fd_msr < 0) {
perror("Error while opening /dev/cpu/0/msr");
printf("Did you run 'modprobe msr'?\n");
return -1;
}
if (rdmsr(MSR_BOOTGUARD, msr) < 0)
return -1;
#endif
return 0;
}