HPET: Difference between revisions
Jump to navigation
Jump to search
m
Add APIC timer references
| [unchecked revision] | [unchecked revision] |
No edit summary |
m (Add APIC timer references) |
||
Line 1:
:''This page is not meant as a full description of HPET, only as a lightweight introduction. If you need any information not covered by this article, consult the [http://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/software-developers-hpet-spec-1-0a.pdf HPET specification].''
'''HPET''', or High Precision Event Timer, is a piece of hardware designed by Intel and Microsoft to replace older [[PIT]] and [[RTC]]. It consists of (usually 64-bit) main counter (which counts up), as well as from 3 to 32 32-bit or 64
==Detecting HPET using ACPI==
The [http://www.intel.com/content/dam/www/public/us/en/documents/technical-specifications/software-developers-hpet-spec-1-0a.pdf HPET specification] defines an ACPI 2.0 table that is to be used to detect presence, address and capabilities of HPET present in the system. If this table doesn't exist, you should assume there is no HPET and you should fall back to [[PIT]] or the [[APIC timer]].
<source lang="cpp">
Line 366:
==See also==
* [[IOAPIC]]
* [[APIC]]
* [[APIC timer]]
* [[PIT]]
* [[RTC]]
| |||