cvs commit: src/sys/amd64/amd64 cpu_switch.S genassym.c src/sys/amd64/include pcb.h

[Peter Wemm]

peter       2004/05/16 15:43:57 PDT

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      cpu_switch.S genassym.c 
    sys/amd64/include    pcb.h 
  Log:
  Checkpoint some of what I was starting to tinker with for having some
  different context support for 32 vs 64 bit processes.  This simply omits
  the save/restore of the segment selector registers for non 32 bit
  processes.  This avoids the rdmsr/rwmsr juggling when restoring %gs
  clobbers the kernel msr that holds the gsbase.
  
  However, I suspect it might be better to conditionally do this at
  user<->kernel transition where we wouldn't need to do the juggling in the
  first place.  Or have per-thread extended context save/restore hooks.
  
  Revision  Changes    Path
  1.150     +18 -7     src/sys/amd64/amd64/cpu_switch.S
  1.154     +1 -0      src/sys/amd64/amd64/genassym.c
  1.59      +1 -0      src/sys/amd64/include/pcb.h