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From: Marcel Moolenaar <marcel@FreeBSD.org>
Date: Sun, 3 Aug 2003 17:08:39 -0700 (PDT)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
	cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/ia64/ia64 exception.S genassym.c
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marcel      2003/08/03 17:08:39 PDT

  FreeBSD src repository

  Modified files:
    sys/ia64/ia64        exception.S genassym.c 
  Log:
  Fix handling of external interrupts: we weren't calling ast() when
  interrupting user mode. The net effect of this bug is that a clock
  interrupt does not cause rescheduling and processes are not
  preempted. It only takes a "while (1);" to render the machine
  useless.
  
  This bug was introduced by the context changes and EPC syscall code.
  Handling of ASTs was moved to C for clarity and ease of maintenance,
  but was not added for the external interrupt case.
  
  This needs to be revisited. We now have calls to do_ast() in trap(),
  break_syscall() and ivt_External_Interrupt(). A single call in
  exception_restore covers these 3 places without duplication. This
  is where we handled ASTs prior to the overhaul, except that the
  meat has been moved to do_ast(), a C function. This was the goal
  to begin with.
  
  Pointy hat: marcel
  
  Revision  Changes    Path
  1.49      +50 -13    src/sys/ia64/ia64/exception.S
  1.35      +1 -1      src/sys/ia64/ia64/genassym.c