diff options
| author | jruoho <jruoho@NetBSD.org> | 2010-08-21 03:55:24 +0000 |
|---|---|---|
| committer | jruoho <jruoho@NetBSD.org> | 2010-08-21 03:55:24 +0000 |
| commit | 6cf2f2d125b8bedfc83475987f251faed411f186 (patch) | |
| tree | 47a2ddb0a0c9e6f25f08a536266ddfc548f5eee2 /sys/dev | |
| parent | d07847971603a9dbdb339b5125573d9e40d8b2ec (diff) | |
Detect whether TSC is invariant, which may be the case on both new AMD and
Intel processors. The invariance means that TSC runs at a constant rate
during all ACPI state changes. If it is variant, skew may occur and TSC is
generally unsuitable for wall clock services. This is especially relevant
with C-states; with variant TSC, the whole counter may be stopped with states
larger than C1. All x86 CPUs before circa mid-2000s can be assumed to have a
variant time stamp counter.
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/acpi/acpi_cpu.h | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/sys/dev/acpi/acpi_cpu.h b/sys/dev/acpi/acpi_cpu.h index 5b7a9721060..50f16ea0f10 100644 --- a/sys/dev/acpi/acpi_cpu.h +++ b/sys/dev/acpi/acpi_cpu.h @@ -1,4 +1,4 @@ -/* $NetBSD: acpi_cpu.h,v 1.20 2010/08/20 12:20:23 jruoho Exp $ */ +/* $NetBSD: acpi_cpu.h,v 1.21 2010/08/21 03:55:24 jruoho Exp $ */ /*- * Copyright (c) 2010 Jukka Ruohonen <jruohonen@iki.fi> @@ -100,15 +100,16 @@ #define ACPICPU_FLAG_C_BM __BIT(6) /* Bus master control */ #define ACPICPU_FLAG_C_BM_STS __BIT(7) /* Bus master check required */ #define ACPICPU_FLAG_C_ARB __BIT(8) /* Bus master arbitration */ -#define ACPICPU_FLAG_C_C1E __BIT(9) /* AMD C1E detected */ +#define ACPICPU_FLAG_C_TSC __BIT(9) /* TSC broken with > C1 */ +#define ACPICPU_FLAG_C_C1E __BIT(10) /* AMD C1E detected */ -#define ACPICPU_FLAG_P_FFH __BIT(10) /* Native P-states */ -#define ACPICPU_FLAG_P_HW __BIT(11) /* HW coordination supported */ -#define ACPICPU_FLAG_P_XPSS __BIT(12) /* Microsoft XPSS in use */ -#define ACPICPU_FLAG_P_TURBO __BIT(13) /* Turbo Boost / Turbo Core */ +#define ACPICPU_FLAG_P_FFH __BIT(11) /* Native P-states */ +#define ACPICPU_FLAG_P_HW __BIT(12) /* HW coordination supported */ +#define ACPICPU_FLAG_P_XPSS __BIT(13) /* Microsoft XPSS in use */ +#define ACPICPU_FLAG_P_TURBO __BIT(14) /* Turbo Boost / Turbo Core */ -#define ACPICPU_FLAG_T_FFH __BIT(14) /* Native throttling */ -#define ACPICPU_FLAG_T_FADT __BIT(15) /* Throttling with FADT */ +#define ACPICPU_FLAG_T_FFH __BIT(15) /* Native throttling */ +#define ACPICPU_FLAG_T_FADT __BIT(16) /* Throttling with FADT */ /* * This is AML_RESOURCE_GENERIC_REGISTER, |
