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| author | avg <avg@FreeBSD.org> | 2013-07-28 17:54:42 +0000 |
|---|---|---|
| committer | avg <avg@FreeBSD.org> | 2013-07-28 17:54:42 +0000 |
| commit | 425573ccba3b555a3407c9958714a764b5e7b609 (patch) | |
| tree | 4420aa26daa238558c6bb6511af95c82d7427921 /sys/x86 | |
| parent | 0b4cdd16b015a683fe1fd725702e6f20e9a87dda (diff) | |
| download | FreeBSD-src-425573ccba3b555a3407c9958714a764b5e7b609.zip FreeBSD-src-425573ccba3b555a3407c9958714a764b5e7b609.tar.gz | |
x86: detect mwait capabilities and extensions, when present
Reviewed by: kib (earlier amd64-only version)
MFC after: 2 weeks
Diffstat (limited to 'sys/x86')
| -rw-r--r-- | sys/x86/include/specialreg.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/sys/x86/include/specialreg.h b/sys/x86/include/specialreg.h index bf1333f..4247ee2 100644 --- a/sys/x86/include/specialreg.h +++ b/sys/x86/include/specialreg.h @@ -240,6 +240,29 @@ #define CPUID_LOCAL_APIC_ID 0xff000000 /* + * CPUID instruction 5 info + */ +#define CPUID5_MON_MIN_SIZE 0x0000ffff /* eax */ +#define CPUID5_MON_MAX_SIZE 0x0000ffff /* ebx */ +#define CPUID5_MON_MWAIT_EXT 0x00000001 /* ecx */ +#define CPUID5_MWAIT_INTRBREAK 0x00000002 /* ecx */ + +/* + * MWAIT cpu power states. Lower 4 bits are sub-states. + */ +#define MWAIT_C0 0xf0 +#define MWAIT_C1 0x00 +#define MWAIT_C2 0x10 +#define MWAIT_C3 0x20 +#define MWAIT_C4 0x30 + +/* + * MWAIT extensions. + */ +/* Interrupt breaks MWAIT even when masked. */ +#define MWAIT_INTRBREAK 0x00000001 + +/* * CPUID instruction 6 ecx info */ #define CPUID_PERF_STAT 0x00000001 |
