cvs commit: src/sys/boot/i386/btx/btx btx.S

John Baldwin jhb at
Fri Aug 8 19:39:20 UTC 2008

jhb         2008-08-08 19:39:11 UTC

  FreeBSD src repository

  Modified files:
    sys/boot/i386/btx/btx btx.S 
  SVN rev 181433 on 2008-08-08 19:39:11Z by jhb
  Fix the hangs reported with the real mode BTX:
  - I had errantly assumed that all user requests should run with interrupts
    enabled.  User requests for software interrupts, however, need to disable
    interrupts (and tracing) just like hardware interrupts.
  - Disable alignment checking when emulating a hardware interrupt as well
    (based on the description of the real mode operation of the 'INT'
    instruction in the IA-32 manuals).
  - Use constants for fields in %eflags.
  Tested by:      bz
  MFC after:      3 days
  Revision  Changes    Path
  1.47      +22 -11    src/sys/boot/i386/btx/btx/btx.S

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