89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
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/*
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* This file is part of msrtool.
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*
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* Copyright (c) 2008 Peter Stuge <peter@stuge.se>
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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 version 2 as
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* published by the Free Software Foundation.
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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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* 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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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include "msrtool.h"
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static int msr_fd[MAX_CORES] = {-1, -1, -1, -1, -1, -1, -1, -1};
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int linux_probe(const struct sysdef *system) {
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struct stat st;
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return 0 == stat("/dev/cpu/0/msr", &st);
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}
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int linux_open(uint8_t cpu, enum SysModes mode) {
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int fmode;
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char fn[32];
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switch (mode) {
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case SYS_RDWR:
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fmode = O_RDWR;
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break;
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case SYS_WRONLY:
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fmode = O_WRONLY;
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break;
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case SYS_RDONLY:
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default:
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fmode = O_RDONLY;
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break;
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}
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if (cpu >= MAX_CORES) {
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fprintf(stderr, "%s: only cores 0-%d are supported. requested=%d\n", __func__, MAX_CORES, cpu);
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return 0;
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}
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if (snprintf(fn, sizeof(fn), "/dev/cpu/%d/msr", cpu) == -1) {
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fprintf(stderr, "%s: snprintf: %s\n", __func__, strerror(errno));
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return 0;
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}
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msr_fd[cpu] = open(fn, fmode);
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if (-1 == msr_fd[cpu]) {
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fprintf(stderr, "open(%s): %s\n", fn, strerror(errno));
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return 0;
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}
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return 1;
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}
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int linux_close(uint8_t cpu) {
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int ret;
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if (cpu >= MAX_CORES) {
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fprintf(stderr, "%s: only cores 0-%d are supported. requested=%d\n", __func__, MAX_CORES, cpu);
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return 0;
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}
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ret = close(msr_fd[cpu]);
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msr_fd[cpu] = 0;
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return 0 == ret;
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}
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int linux_rdmsr(uint8_t cpu, uint32_t addr, struct msr *val) {
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if (lseek(msr_fd[cpu], addr, SEEK_SET) == -1) {
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SYSERROR(lseek, addr);
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return 0;
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}
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if (read(msr_fd[cpu], val, 8) != 8) {
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SYSERROR(read, addr);
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return 0;
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}
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return 1;
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}
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