diff options
| author | Scott Soule Cheloha <cheloha@cvs.openbsd.org> | 2022-10-24 00:56:34 +0000 |
|---|---|---|
| committer | Scott Soule Cheloha <cheloha@cvs.openbsd.org> | 2022-10-24 00:56:34 +0000 |
| commit | f49ca6f94b347cf641ddb24f4813ca8aafdf9307 (patch) | |
| tree | 0f8f275459bdae3f330c9a83d2f3ce39213d7553 /sys/arch/amd64/include | |
| parent | 946e46b6c2f1c41722f9f8f6fa5c11774fc328e2 (diff) | |
tsc: AMD Family 17h, 19h: compute frequency from Core::X86::Msr:PStateDef
Compute the TSC frequency on AMD family 17h and 19h CPUs using the
PStateDef MSRs.
Link 1: https://marc.info/?l=openbsd-tech&m=166394236029484&w=2
Link 2: https://marc.info/?l=openbsd-tech&m=166446065916283&w=2
Test list: https://marc.info/?l=openbsd-tech&m=166646389821326&w=2
Reviewed by kettenis@ using the AMD documents cited in the comments.
Maybe reviewed by mlarkin@? I can't remember. He seemed supportive
of the idea at least.
ok kettenis@
Diffstat (limited to 'sys/arch/amd64/include')
| -rw-r--r-- | sys/arch/amd64/include/specialreg.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/arch/amd64/include/specialreg.h b/sys/arch/amd64/include/specialreg.h index e7bc30f27b7..cbde6cf9b02 100644 --- a/sys/arch/amd64/include/specialreg.h +++ b/sys/arch/amd64/include/specialreg.h @@ -1,4 +1,4 @@ -/* $OpenBSD: specialreg.h,v 1.94 2022/08/30 17:09:21 dv Exp $ */ +/* $OpenBSD: specialreg.h,v 1.95 2022/10/24 00:56:33 cheloha Exp $ */ /* $NetBSD: specialreg.h,v 1.1 2003/04/26 18:39:48 fvdl Exp $ */ /* $NetBSD: x86/specialreg.h,v 1.2 2003/04/25 21:54:30 fvdl Exp $ */ @@ -540,6 +540,10 @@ */ #define MSR_HWCR 0xc0010015 #define HWCR_FFDIS 0x00000040 +#define HWCR_TSCFREQSEL 0x01000000 + +#define MSR_PSTATEDEF(_n) (0xc0010064 + (_n)) +#define PSTATEDEF_EN 0x8000000000000000ULL #define MSR_NB_CFG 0xc001001f #define NB_CFG_DISIOREQLOCK 0x0000000000000004ULL |