coreboot-kgpe-d16/util/msrtool/linux.c

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/*
* This file is part of msrtool.
*
* Copyright (c) 2008 Peter Stuge <peter@stuge.se>
*
* 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 ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
Remove address from GPLv2 headers As per discussion with lawyers[tm], it's not a good idea to shorten the license header too much - not for legal reasons but because there are tools that look for them, and giving them a standard pattern simplifies things. However, we got confirmation that we don't have to update every file ever added to coreboot whenever the FSF gets a new lease, but can drop the address instead. util/kconfig is excluded because that's imported code that we may want to synchronize every now and then. $ find * -type f -exec sed -i "s:Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *MA[, ]*02110-1301[, ]*USA:Foundation, Inc.:" {} + $ find * -type f -exec sed -i "s:Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA:Foundation, Inc.:" {} + $ find * -type f -exec sed -i "s:Foundation, Inc., 59 Temple Place[-, ]*Suite 330, Boston, MA *02111-1307[, ]*USA:Foundation, Inc.:" {} + $ find * -type f -exec sed -i "s:Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.:Foundation, Inc.:" {} + $ find * -type f -a \! -name \*.patch \ -a \! -name \*_shipped \ -a \! -name LICENSE_GPL \ -a \! -name LGPL.txt \ -a \! -name COPYING \ -a \! -name DISCLAIMER \ -exec sed -i "/Foundation, Inc./ N;s:Foundation, Inc.* USA\.* *:Foundation, Inc. :;s:Foundation, Inc. $:Foundation, Inc.:" {} + Change-Id: Icc968a5a5f3a5df8d32b940f9cdb35350654bef9 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/9233 Tested-by: build bot (Jenkins) Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>
2015-03-26 15:17:45 +01:00
* Foundation, Inc.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "msrtool.h"
static int msr_fd[MAX_CORES] = {-1, -1, -1, -1, -1, -1, -1, -1};
int linux_probe(const struct sysdef *system) {
struct stat st;
return 0 == stat("/dev/cpu/0/msr", &st);
}
int linux_open(uint8_t cpu, enum SysModes mode) {
int fmode;
char fn[32];
switch (mode) {
case SYS_RDWR:
fmode = O_RDWR;
break;
case SYS_WRONLY:
fmode = O_WRONLY;
break;
case SYS_RDONLY:
default:
fmode = O_RDONLY;
break;
}
if (cpu >= MAX_CORES) {
fprintf(stderr, "%s: only cores 0-%d are supported. requested=%d\n", __func__, MAX_CORES, cpu);
return 0;
}
if (snprintf(fn, sizeof(fn), "/dev/cpu/%d/msr", cpu) == -1) {
fprintf(stderr, "%s: snprintf: %s\n", __func__, strerror(errno));
return 0;
}
msr_fd[cpu] = open(fn, fmode);
if (-1 == msr_fd[cpu]) {
fprintf(stderr, "open(%s): %s\n", fn, strerror(errno));
return 0;
}
return 1;
}
int linux_close(uint8_t cpu) {
int ret;
if (cpu >= MAX_CORES) {
fprintf(stderr, "%s: only cores 0-%d are supported. requested=%d\n", __func__, MAX_CORES, cpu);
return 0;
}
ret = close(msr_fd[cpu]);
msr_fd[cpu] = 0;
return 0 == ret;
}
int linux_rdmsr(uint8_t cpu, uint32_t addr, struct msr *val) {
struct msr tmp;
if (lseek(msr_fd[cpu], addr, SEEK_SET) == -1) {
SYSERROR(lseek, addr);
return 0;
}
if (read(msr_fd[cpu], &tmp, 8) != 8) {
SYSERROR(read, addr);
return 0;
}
val->hi = tmp.lo;
val->lo = tmp.hi;
return 1;
}