git: kernel - Implement CHECKTIMEOUT() abstraction

Matthew Dillon dillon at
Sun Oct 31 19:46:36 PDT 2010

commit d8129ed32f842ce396ec6ffef6c37ae4a258bcde
Author: Matthew Dillon <dillon at>
Date:   Sun Oct 31 19:36:11 2010 -0700

    kernel - Implement CHECKTIMEOUT() abstraction
    * Implement a CHECKTIMEOUT() abstraction which allows us to remove retry
      counts from low level device driver loops and replace them with a
      timeout polling routine.
    * Use in the keyboard code so we no longer make assumptions on how long
      it takes to inb/outb the keyboard controller.  Some BIOSes do not have
      a keyboard controller at all and emulate the ports via SMI, which is
      much much slower than accessing a real port.

Summary of changes:
 sys/dev/misc/kbd/atkbdc.c         |   30 +++++++++++++++---------------
 sys/platform/pc32/include/clock.h |   10 ++++++++++
 sys/platform/pc32/isa/clock.c     |   22 ++++++++++++++++++++++
 sys/platform/pc64/include/clock.h |   10 ++++++++++
 sys/platform/pc64/isa/clock.c     |   27 +++++++++++++++++++++++++++
 5 files changed, 84 insertions(+), 15 deletions(-)

DragonFly BSD source repository

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