coreboot-kgpe-d16/util/intelmetool/msr.c
Pablo Stebler 9ac91d220f util/intelmetool: Fix the BootGuard dump feature
Read the correct bits for measured and verified boot, print information
about some other bits.

Signed-off-by: Pablo Stebler <pablo@stebler.xyz>
Change-Id: Ie79d6da33032aee94d716bf0698b5501bbc424fa
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45516
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
2020-09-23 20:58:28 +00:00

58 lines
995 B
C

/* intelmetool */
/* 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;
}