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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-24 04:52:22 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-24 04:52:22 +0000 |
commit | 3d08cd331c1adcf0d917392f7e527b3f00511748 (patch) | |
tree | 312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man4/cpuid.4 | |
parent | Adding debian version 6.7-2. (diff) | |
download | manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip |
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man4/cpuid.4')
-rw-r--r-- | man4/cpuid.4 | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/man4/cpuid.4 b/man4/cpuid.4 deleted file mode 100644 index e58e29e..0000000 --- a/man4/cpuid.4 +++ /dev/null @@ -1,83 +0,0 @@ -.\" Copyright (c) 2009 Intel Corporation, Author Andi Kleen -.\" Description based on comments in arch/x86/kernel/cpuid.c -.\" -.\" SPDX-License-Identifier: Linux-man-pages-copyleft -.\" -.TH cpuid 4 2024-01-05 "Linux man-pages 6.7" -.SH NAME -cpuid \- x86 CPUID access device -.SH DESCRIPTION -CPUID provides an interface for querying information about the x86 CPU. -.P -This device is accessed by -.BR lseek (2) -or -.BR pread (2) -to the appropriate CPUID level and reading in chunks of 16 bytes. -A larger read size means multiple reads of consecutive levels. -.P -The lower 32 bits of the file position is used as the incoming -.IR %eax , -and the upper 32 bits of the file position as the incoming -.IR %ecx , -the latter is intended for "counting" -.I eax -levels like -.IR eax=4 . -.P -This driver uses -.IR /dev/cpu/CPUNUM/cpuid , -where -.I CPUNUM -is the minor number, -and on an SMP box will direct the access to CPU -.I CPUNUM -as listed in -.IR /proc/cpuinfo . -.P -This file is protected so that it can be read only by the user -.IR root , -or members of the group -.IR root . -.SH NOTES -The CPUID instruction can be directly executed by a program -using inline assembler. -However this device allows convenient -access to all CPUs without changing process affinity. -.P -Most of the information in -.I cpuid -is reported by the kernel in cooked form either in -.I /proc/cpuinfo -or through subdirectories in -.IR /sys/devices/system/cpu . -Direct CPUID access through this device should only -be used in exceptional cases. -.P -The -.I cpuid -driver is not auto-loaded. -On modular kernels you might need to use the following command -to load it explicitly before use: -.P -.in +4n -.EX -$ modprobe cpuid -.EE -.in -.P -There is no support for CPUID functions that require additional -input registers. -.P -Early i486 CPUs do not support the CPUID instruction; -.\" arch/x86/kernel/cpuid.c cpuid_open() -opening this device for those CPUs fails with EIO. -.SH SEE ALSO -.BR cpuid (1) -.P -Intel Corporation, Intel 64 and IA-32 Architectures -Software Developer's Manual Volume 2A: -Instruction Set Reference, A-M, 3-180 CPUID reference. -.P -Intel Corporation, Intel Processor Identification and -the CPUID Instruction, Application note 485. |