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| author | Konstantin Belousov <kib@FreeBSD.org> | 2018-01-05 21:06:19 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2018-01-05 21:06:19 +0000 |
| commit | 0530a9360f72fa080d17eaf96b384a79b83a6e7c (patch) | |
| tree | 58fe75291f3758eda9ae880aec28df2ce80b36ac /sys/sys | |
| parent | b4f55763cef7b61acb16f1041f69669fc6c2ac02 (diff) | |
| download | src-0530a9360f72fa080d17eaf96b384a79b83a6e7c.tar.gz src-0530a9360f72fa080d17eaf96b384a79b83a6e7c.zip | |
Make it possible to re-evaluate cpu_features.
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
Notes
Notes:
svn path=/head/; revision=327597
Diffstat (limited to 'sys/sys')
| -rw-r--r-- | sys/sys/cpuctl.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/sys/cpuctl.h b/sys/sys/cpuctl.h index 70212eb3a851..8c7fb65632f5 100644 --- a/sys/sys/cpuctl.h +++ b/sys/sys/cpuctl.h @@ -59,5 +59,6 @@ typedef struct { #define CPUCTL_MSRSBIT _IOWR('c', 5, cpuctl_msr_args_t) #define CPUCTL_MSRCBIT _IOWR('c', 6, cpuctl_msr_args_t) #define CPUCTL_CPUID_COUNT _IOWR('c', 7, cpuctl_cpuid_count_args_t) +#define CPUCTL_EVAL_CPU_FEATURES _IO('c', 8) #endif /* _CPUCTL_H_ */ |