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From: Peter Wemm <peter@FreeBSD.org>
Date: Tue, 13 Nov 2007 23:00:24 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/i386/i386 locore.s machdep.c mp_machdep.c
 pmap.c src/sys/i386/include pmap.h
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peter       2007-11-13 23:00:24 UTC

  FreeBSD src repository

  Modified files:
    sys/i386/i386        locore.s machdep.c mp_machdep.c pmap.c 
    sys/i386/include     pmap.h 
  Log:
  Drastically simplify the i386 pcpu backend by merging parts of the
  amd64 mechanism over.  Instead of page table hackery that isn't
  actually needed, just use 'struct pcpu __pcpu[MAXCPU]' for backing like
  all the other platforms do.  Get rid of 'struct privatespace' and a
  while mess of #ifdef SMP garbage that set it up.  As a bonus, this
  returns the 4MB of KVA that we stole to implement it the old way.
  This also allows you to read the pcpu data for each cpu when reading a
  minidump.
  
  Background information:  Originally, pcpu stuff was implemented as having
  per-cpu page tables and magic to make different data structures appear
  at the same actual address.  In order to share page tables, we switched
  to using the GDT and %fs/%gs to access it.  But we still did the evil
  magic to set it up for the old way.  The "idle stacks" are not used
  for the idle process anymore and are just used for a few functions during
  bootup, then ignored.  (excercise for reader: free these afterwards).
  
  Revision  Changes    Path
  1.189     +0 -65     src/sys/i386/i386/locore.s
  1.661     +2 -9      src/sys/i386/i386/machdep.c
  1.282     +22 -45    src/sys/i386/i386/mp_machdep.c
  1.598     +0 -10     src/sys/i386/i386/pmap.c
  1.129     +1 -12     src/sys/i386/include/pmap.h