kern/112544: Add High Precision Event Timer Driver for userland timer facility

Takeharu KATO takeharu1219 at ybb.ne.jp
Wed May 9 11:20:03 UTC 2007


>Number:         112544
>Category:       kern
>Synopsis:       Add High Precision Event Timer Driver for userland timer facility
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 09 11:20:02 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Takeharu KATO
>Release:        FreeBSD 7.0-CURRENT i386
>Organization:
none
>Environment:
System: FreeBSD aeon 7.0-CURRENT FreeBSD 7.0-CURRENT #3: Thu Apr 26 01:21:09 JST 2007 root at aeon:/usr/obj/usr/src/sys/GENERIC i386

	machine	: i386 PC/AT(Mother-Board: GIGABYTE GA-965P-DS3)
	os	: FreeBSD 7.0-CURRENT (2007/04/25 snapshot)
	target	: High Precision Event Timer Driver

>Description:
This patch add following facilities to acpi_hpet timer driver.

	1) Periodic timer facility
	    This driver provides periodic timer facility for userland applications to 
	   use for appication specific process scheduling.

	2) Global time stamp for SMP machines.
	    This driver provides a common time-base on N-Way MP system via mmap system call.
	   It is not affected by clock freq. drifts.
	    
The following issues remain in the range that I notice:

(a) HPET timer facility can not share the interrupt with other devices:

   This constraint comes from design of HPET timer device, ISR register in HPET
  does not reports ISR state when the HPET interrupts are configured as edge interrupt.

   So we can not determine whether the interrupt should be handled by HPET driver or not.

   If we configure HPET timer interrupts as level interrupt when driver initialization phase,
  it may be able to determine the owner of interrupts. 

(b) Timer0 is not available:
   Due to issue (a), HPET timer interrupts are routed with legacy routing way 
  which is mentioned in HPET/ICH-N manuals. 

   In this way, timer0's interrupt is routed to IRQ2.

   However, as far as I see, bus_setup_interrupt can not setup the interrupt handler of IRQ2. 

   To solve this problem, we can use I/O APIC routing in stead of legacy routing.
   
   But this solution raises issue(a).  So, I can not figure out how to solve this issue.

>How-To-Repeat:
	Attached test programs(they are included in hpet-tp.tar.bz2.uu) can be used to test this driver.
	
>Fix:
	This is not a bug.

begin 644 hpet-timer-20070509.patch.gz
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end

>Release-Note:
>Audit-Trail:
>Unformatted:


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