0530a9360f
Add cpuctl(4) ioctl CPUCTL_EVAL_CPU_FEATURES which forces re-read of cpu_features, cpu_features2, cpu_stdext_features, and std_stdext_features2. The intent is to allow the kernel to see the changes in the CPU features after micocode update. Of course, the update is not atomic across variables and not synchronized with readers. See the man page warning as well. Reviewed by: imp (previous version), jilles Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D13770
65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2006-2008 Stanislav Sedov <stas@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _CPUCTL_H_
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#define _CPUCTL_H_
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typedef struct {
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int msr; /* MSR to read */
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uint64_t data;
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} cpuctl_msr_args_t;
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typedef struct {
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int level; /* CPUID level */
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uint32_t data[4];
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} cpuctl_cpuid_args_t;
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typedef struct {
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int level; /* CPUID level */
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int level_type; /* CPUID level type */
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uint32_t data[4];
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} cpuctl_cpuid_count_args_t;
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typedef struct {
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void *data;
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size_t size;
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} cpuctl_update_args_t;
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#define CPUCTL_RDMSR _IOWR('c', 1, cpuctl_msr_args_t)
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#define CPUCTL_WRMSR _IOWR('c', 2, cpuctl_msr_args_t)
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#define CPUCTL_CPUID _IOWR('c', 3, cpuctl_cpuid_args_t)
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#define CPUCTL_UPDATE _IOWR('c', 4, cpuctl_update_args_t)
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#define CPUCTL_MSRSBIT _IOWR('c', 5, cpuctl_msr_args_t)
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#define CPUCTL_MSRCBIT _IOWR('c', 6, cpuctl_msr_args_t)
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#define CPUCTL_CPUID_COUNT _IOWR('c', 7, cpuctl_cpuid_count_args_t)
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#define CPUCTL_EVAL_CPU_FEATURES _IO('c', 8)
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#endif /* _CPUCTL_H_ */
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