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From: Bruce Evans <bde@FreeBSD.ORG>
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Date: Sat, 19 Sep 1998 20:47:55 -0700 (PDT)
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To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject: cvs commit: src/sys/i386/isa clock.c
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bde         1998/09/19 20:47:54 PDT

  Modified files:
    sys/i386/isa         clock.c 
  Log:
  Ensure that the i8254 timecounter doesn't go backards.  It sometimes
  went backwards when interrupts were masked for more than one i8254
  interrupt period.  It sometimes went backwards when the i8254 counter
  was reprogrammed.  Neither of these should happen in normal operation.
  
  Update the i8254 timecounter support variables atomically.  Calling
  timecounter functions from fast interrupt handlers may actually work
  in all cases now.
  
  Revision  Changes    Path
  1.126     +21 -6     src/sys/i386/isa/clock.c