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freebsd-nq/usr.sbin/cpucontrol/cpucontrol.h

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- Add cpuctl(4) pseudo-device driver to provide access to some low-level features of CPUs like reading/writing machine-specific registers, retrieving cpuid data, and updating microcode. - Add cpucontrol(8) utility, that provides userland access to the features of cpuctl(4). - Add subsequent manpages. The cpuctl(4) device operates as follows. The pseudo-device node cpuctlX is created for each cpu present in the systems. The pseudo-device minor number corresponds to the cpu number in the system. The cpuctl(4) pseudo- device allows a number of ioctl to be preformed, namely RDMSR/WRMSR/CPUID and UPDATE. The first pair alows the caller to read/write machine-specific registers from the correspondent CPU. cpuid data could be retrieved using the CPUID call, and microcode updates are applied via UPDATE. The permissions are inforced based on the pseudo-device file permissions. RDMSR/CPUID will be allowed when the caller has read access to the device node, while WRMSR/UPDATE will be granted only when the node is opened for writing. There're also a number of priv(9) checks. The cpucontrol(8) utility is intened to provide userland access to the cpuctl(4) device features. The utility also allows one to apply cpu microcode updates. Currently only Intel and AMD cpus are supported and were tested. Approved by: kib Reviewed by: rpaulo, cokane, Peter Jeremy MFC after: 1 month
2008-08-08 16:26:53 +00:00
/*-
various: general adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
2017-11-27 15:37:16 +00:00
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
- Add cpuctl(4) pseudo-device driver to provide access to some low-level features of CPUs like reading/writing machine-specific registers, retrieving cpuid data, and updating microcode. - Add cpucontrol(8) utility, that provides userland access to the features of cpuctl(4). - Add subsequent manpages. The cpuctl(4) device operates as follows. The pseudo-device node cpuctlX is created for each cpu present in the systems. The pseudo-device minor number corresponds to the cpu number in the system. The cpuctl(4) pseudo- device allows a number of ioctl to be preformed, namely RDMSR/WRMSR/CPUID and UPDATE. The first pair alows the caller to read/write machine-specific registers from the correspondent CPU. cpuid data could be retrieved using the CPUID call, and microcode updates are applied via UPDATE. The permissions are inforced based on the pseudo-device file permissions. RDMSR/CPUID will be allowed when the caller has read access to the device node, while WRMSR/UPDATE will be granted only when the node is opened for writing. There're also a number of priv(9) checks. The cpucontrol(8) utility is intened to provide userland access to the cpuctl(4) device features. The utility also allows one to apply cpu microcode updates. Currently only Intel and AMD cpus are supported and were tested. Approved by: kib Reviewed by: rpaulo, cokane, Peter Jeremy MFC after: 1 month
2008-08-08 16:26:53 +00:00
* Copyright (c) 2008 Stanislav Sedov <stas@FreeBSD.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef CPUCONTROL_H
#define CPUCONTROL_H
cpucontrol(8): De-duplicate common update logic Every µcode-updater must open the cpucontrol devfs node RDWR, open a firmware file, validate the FW file has a positive length, mmap it, etc. De-duplicate that identical logic between every individual platform. Also, constify references to the readonly-mapped firmware files while here. Sponsored by: Dell EMC Isilon
2018-11-14 00:21:49 +00:00
#include <stddef.h>
- Add cpuctl(4) pseudo-device driver to provide access to some low-level features of CPUs like reading/writing machine-specific registers, retrieving cpuid data, and updating microcode. - Add cpucontrol(8) utility, that provides userland access to the features of cpuctl(4). - Add subsequent manpages. The cpuctl(4) device operates as follows. The pseudo-device node cpuctlX is created for each cpu present in the systems. The pseudo-device minor number corresponds to the cpu number in the system. The cpuctl(4) pseudo- device allows a number of ioctl to be preformed, namely RDMSR/WRMSR/CPUID and UPDATE. The first pair alows the caller to read/write machine-specific registers from the correspondent CPU. cpuid data could be retrieved using the CPUID call, and microcode updates are applied via UPDATE. The permissions are inforced based on the pseudo-device file permissions. RDMSR/CPUID will be allowed when the caller has read access to the device node, while WRMSR/UPDATE will be granted only when the node is opened for writing. There're also a number of priv(9) checks. The cpucontrol(8) utility is intened to provide userland access to the cpuctl(4) device features. The utility also allows one to apply cpu microcode updates. Currently only Intel and AMD cpus are supported and were tested. Approved by: kib Reviewed by: rpaulo, cokane, Peter Jeremy MFC after: 1 month
2008-08-08 16:26:53 +00:00
typedef int ucode_probe_t(int fd);
cpucontrol(8): De-duplicate common update logic Every µcode-updater must open the cpucontrol devfs node RDWR, open a firmware file, validate the FW file has a positive length, mmap it, etc. De-duplicate that identical logic between every individual platform. Also, constify references to the readonly-mapped firmware files while here. Sponsored by: Dell EMC Isilon
2018-11-14 00:21:49 +00:00
struct ucode_update_params {
int devfd; /* RDWR handle to cpucontrol device */
const void *fwimage; /* READ mapping of firmware image */
size_t fwsize; /* Non-zero size of firmware image */
const char *dev_path; /* cpucontrol device path, for logging */
const char *fw_path; /* firmware image path, for logging */
};
typedef void ucode_update_t(const struct ucode_update_params *params);
- Add cpuctl(4) pseudo-device driver to provide access to some low-level features of CPUs like reading/writing machine-specific registers, retrieving cpuid data, and updating microcode. - Add cpucontrol(8) utility, that provides userland access to the features of cpuctl(4). - Add subsequent manpages. The cpuctl(4) device operates as follows. The pseudo-device node cpuctlX is created for each cpu present in the systems. The pseudo-device minor number corresponds to the cpu number in the system. The cpuctl(4) pseudo- device allows a number of ioctl to be preformed, namely RDMSR/WRMSR/CPUID and UPDATE. The first pair alows the caller to read/write machine-specific registers from the correspondent CPU. cpuid data could be retrieved using the CPUID call, and microcode updates are applied via UPDATE. The permissions are inforced based on the pseudo-device file permissions. RDMSR/CPUID will be allowed when the caller has read access to the device node, while WRMSR/UPDATE will be granted only when the node is opened for writing. There're also a number of priv(9) checks. The cpucontrol(8) utility is intened to provide userland access to the cpuctl(4) device features. The utility also allows one to apply cpu microcode updates. Currently only Intel and AMD cpus are supported and were tested. Approved by: kib Reviewed by: rpaulo, cokane, Peter Jeremy MFC after: 1 month
2008-08-08 16:26:53 +00:00
extern int verbosity_level;
#ifdef DEBUG
# define WARNX(level, ...) \
if ((level) <= verbosity_level) { \
fprintf(stderr, "%s:%d ", __FILE__, __LINE__); \
warnx(__VA_ARGS__); \
}
# define WARN(level, ...) \
if ((level) <= verbosity_level) { \
fprintf(stderr, "%s:%d ", __FILE__, __LINE__); \
warn(__VA_ARGS__); \
}
#else
# define WARNX(level, ...) \
if ((level) <= verbosity_level) \
warnx(__VA_ARGS__);
# define WARN(level, ...) \
if ((level) <= verbosity_level) \
warn(__VA_ARGS__);
#endif
#endif /* !CPUCONTROL_H */
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