Talk:High Precision Event Timer

message: A rather obvious question I came here for that is currently unaddressed in this article is: how do you know if a system includes an HPET? After all, regardless of what OS you have, you can't use HPET if its hardware isn't there. Is the HPET a separate IC? Is it incorporated into motherboard support chips? Are there CPU-based associations? I didn't notice anything in the two supporting documents that specifically addressed real-world implementations of this functionality. ~ Jeff Q (talk) 18:57, 24 September 2007 (UTC)
replies: text: Some initial hints: it appears to be incorporated into at least one southbridge (ATI's SB600), which I guess makes sense because southbridges handle real-time clock circuitry. Someone also claims HPET is support in the VIA 8237 but not the 8235. ~ Jeff Q (talk) 19:13, 24 September 2007 (UTC)
thread_title:  Identifying systems with HPET 

message: "HPET is meant to supplement and replace the 8254 Programmable Interval Timer (PIT) and the Real-time clock's (RTC) periodic interrupt function" How is this done, e.g. in circuitry, the BIOS, the OS? -- AzzAz (talk) 20:31, 28 February 2008 (UTC)
thread_title:  Replacing Timers 

message: The very least you should say if it is a KIND OF HARDWARE, or a SPECIFIC HARDWARE. 
89.139.171.186 (talk) 15:00, 18 April 2008 (UTC)
thread_title:  What is it? 

message: The link to the Microsoft site states, that 64-bit HPETs will be used in 32-bit mode, so that means that I can set it to 32-bit in the BIOS as well. I wonder whether at least 64-bit Windows OSs use the 64-bit timer registers? ~ Spacy  —Preceding unsigned comment added by 92.193.80.110 (talk) 09:55, 28 September 2008 (UTC)
thread_title:  32 bit or 64 bit 

message: I contributed some stuff to this article (as 86.140.252.28) based on research and experimentation using XP both on an AMD and an Intel box, both of which were intriguingly quoting HPET even though the 15MHz Intel device was not being used.  However, I could only do this from the point of an application software engineer with access to hardware and software specifications and Microsoft online documentation.  It would be really useful if someone with insider knowledge of motherboard design and BIOS writing could clarify how the connectivity issues are resolved:  For instance, is the manner in which available devices in the SouthBridge chip are used to provide the "virtual" timing devices negotiable only at track wiring level (e.g. could the HPET in fact be emulating RTC/PMTimer in hardware; is it still seperately connected and wired; or is it ruled out by common signal paths when normal RTC/PMTimer usage is intended?).  Is it the BIOS that tells the HAL what is available, or can the HAL actually make effective runtime wiring (connectivity) descisions?  If Windows XP doesn't even ask about a true hardware HPET, then is it possible that a special device driver could be written to allow its use by software applications that are aware of that driver?  Or would that again suffer the problem that no seperate and independant interrupt vector could be set up?  Can somebody (or has somebody) with driver writing experience create (created) such a driver for Windows XP?  — Preceding unsigned comment added by Alex Tidmarsh (talk • contribs) 20:49, 26 December 2011 (UTC)
thread_title:  Any BIOS/Motherboard designers care to comment? 

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