a73b93157f
It encourages users from writing to the FSF without giving an address. Linux also prefers to drop that and their checkpatch.pl (that we imported) looks out for that. This is the result of util/scripts/no-fsf-addresses.sh with no further editing. Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11888 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
87 lines
2 KiB
C
87 lines
2 KiB
C
/*
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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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#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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struct msr tmp;
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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], &tmp, 8) != 8) {
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SYSERROR(read, addr);
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return 0;
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}
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val->hi = tmp.lo;
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val->lo = tmp.hi;
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return 1;
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}
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