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+    ChangeLog
+
+    Prehistory Martin Tischhäuser <martin@ikcbarka.fzk.de>
+               Initial register-setting code (from proform-1.0).
+    19971216   Richard Gooch <rgooch@atnf.csiro.au>
+               Original version for /proc/mtrr interface, SMP-safe.
+  v1.0
+    19971217   Richard Gooch <rgooch@atnf.csiro.au>
+               Bug fix for ioctls()'s.
+               Added sample code in Documentation/mtrr.txt
+  v1.1
+    19971218   Richard Gooch <rgooch@atnf.csiro.au>
+               Disallow overlapping regions.
+    19971219   Jens Maurer <jmaurer@menuett.rhein-main.de>
+               Register-setting fixups.
+  v1.2
+    19971222   Richard Gooch <rgooch@atnf.csiro.au>
+               Fixups for kernel 2.1.75.
+  v1.3
+    19971229   David Wragg <dpw@doc.ic.ac.uk>
+               Register-setting fixups and conformity with Intel conventions.
+    19971229   Richard Gooch <rgooch@atnf.csiro.au>
+               Cosmetic changes and wrote this ChangeLog ;-)
+    19980106   Richard Gooch <rgooch@atnf.csiro.au>
+               Fixups for kernel 2.1.78.
+  v1.4
+    19980119   David Wragg <dpw@doc.ic.ac.uk>
+               Included passive-release enable code (elsewhere in PCI setup).
+  v1.5
+    19980131   Richard Gooch <rgooch@atnf.csiro.au>
+               Replaced global kernel lock with private spinlock.
+  v1.6
+    19980201   Richard Gooch <rgooch@atnf.csiro.au>
+               Added wait for other CPUs to complete changes.
+  v1.7
+    19980202   Richard Gooch <rgooch@atnf.csiro.au>
+               Bug fix in definition of <set_mtrr> for UP.
+  v1.8
+    19980319   Richard Gooch <rgooch@atnf.csiro.au>
+               Fixups for kernel 2.1.90.
+    19980323   Richard Gooch <rgooch@atnf.csiro.au>
+               Move SMP BIOS fixup before secondary CPUs call <calibrate_delay>
+  v1.9
+    19980325   Richard Gooch <rgooch@atnf.csiro.au>
+               Fixed test for overlapping regions: confused by adjacent regions
+    19980326   Richard Gooch <rgooch@atnf.csiro.au>
+               Added wbinvd in <set_mtrr_prepare>.
+    19980401   Richard Gooch <rgooch@atnf.csiro.au>
+               Bug fix for non-SMP compilation.
+    19980418   David Wragg <dpw@doc.ic.ac.uk>
+               Fixed-MTRR synchronisation for SMP and use atomic operations
+               instead of spinlocks.
+    19980418   Richard Gooch <rgooch@atnf.csiro.au>
+               Differentiate different MTRR register classes for BIOS fixup.
+  v1.10
+    19980419   David Wragg <dpw@doc.ic.ac.uk>
+               Bug fix in variable MTRR synchronisation.
+  v1.11
+    19980419   Richard Gooch <rgooch@atnf.csiro.au>
+               Fixups for kernel 2.1.97.
+  v1.12
+    19980421   Richard Gooch <rgooch@atnf.csiro.au>
+               Safer synchronisation across CPUs when changing MTRRs.
+  v1.13
+    19980423   Richard Gooch <rgooch@atnf.csiro.au>
+               Bugfix for SMP systems without MTRR support.
+  v1.14
+    19980427   Richard Gooch <rgooch@atnf.csiro.au>
+               Trap calls to <mtrr_add> and <mtrr_del> on non-MTRR machines.
+  v1.15
+    19980427   Richard Gooch <rgooch@atnf.csiro.au>
+               Use atomic bitops for setting SMP change mask.
+  v1.16
+    19980428   Richard Gooch <rgooch@atnf.csiro.au>
+               Removed spurious diagnostic message.
+  v1.17
+    19980429   Richard Gooch <rgooch@atnf.csiro.au>
+               Moved register-setting macros into this file.
+               Moved setup code from init/main.c to i386-specific areas.
+  v1.18
+    19980502   Richard Gooch <rgooch@atnf.csiro.au>
+               Moved MTRR detection outside conditionals in <mtrr_init>.
+  v1.19
+    19980502   Richard Gooch <rgooch@atnf.csiro.au>
+               Documentation improvement: mention Pentium II and AGP.
+  v1.20
+    19980521   Richard Gooch <rgooch@atnf.csiro.au>
+               Only manipulate interrupt enable flag on local CPU.
+               Allow enclosed uncachable regions.
+  v1.21
+    19980611   Richard Gooch <rgooch@atnf.csiro.au>
+               Always define <main_lock>.
+  v1.22
+    19980901   Richard Gooch <rgooch@atnf.csiro.au>
+               Removed module support in order to tidy up code.
+               Added sanity check for <mtrr_add>/<mtrr_del> before <mtrr_init>.
+               Created addition queue for prior to SMP commence.
+  v1.23
+    19980902   Richard Gooch <rgooch@atnf.csiro.au>
+               Ported patch to kernel 2.1.120-pre3.
+  v1.24
+    19980910   Richard Gooch <rgooch@atnf.csiro.au>
+               Removed sanity checks and addition queue: Linus prefers an OOPS.
+  v1.25
+    19981001   Richard Gooch <rgooch@atnf.csiro.au>
+               Fixed harmless compiler warning in include/asm-i386/mtrr.h
+               Fixed version numbering and history for v1.23 -> v1.24.
+  v1.26
+    19990118   Richard Gooch <rgooch@atnf.csiro.au>
+               Added devfs support.
+  v1.27
+    19990123   Richard Gooch <rgooch@atnf.csiro.au>
+               Changed locking to spin with reschedule.
+               Made use of new <smp_call_function>.
+  v1.28
+    19990201   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Extended the driver to be able to use Cyrix style ARRs.
+    19990204   Richard Gooch <rgooch@atnf.csiro.au>
+               Restructured Cyrix support.
+  v1.29
+    19990204   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Refined ARR support: enable MAPEN in set_mtrr_prepare()
+               and disable MAPEN in set_mtrr_done().
+    19990205   Richard Gooch <rgooch@atnf.csiro.au>
+               Minor cleanups.
+  v1.30
+    19990208   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Protect plain 6x86s (and other processors without the
+               Page Global Enable feature) against accessing CR4 in
+               set_mtrr_prepare() and set_mtrr_done().
+    19990210   Richard Gooch <rgooch@atnf.csiro.au>
+               Turned <set_mtrr_up> and <get_mtrr> into function pointers.
+  v1.31
+    19990212   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Major rewrite of cyrix_arr_init(): do not touch ARRs,
+               leave them as the BIOS have set them up.
+               Enable usage of all 8 ARRs.
+               Avoid multiplications by 3 everywhere and other
+               code clean ups/speed ups.
+    19990213   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Set up other Cyrix processors identical to the boot cpu.
+               Since Cyrix don't support Intel APIC, this is l'art pour l'art.
+               Weigh ARRs by size:
+               If size <= 32M is given, set up ARR# we were given.
+               If size >  32M is given, set up ARR7 only if it is free,
+               fail otherwise.
+    19990214   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Also check for size >= 256K if we are to set up ARR7,
+               mtrr_add() returns the value it gets from set_mtrr()
+    19990218   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Remove Cyrix "coma bug" workaround from here.
+               Moved to linux/arch/i386/kernel/setup.c and
+               linux/include/asm-i386/bugs.h
+    19990228   Richard Gooch <rgooch@atnf.csiro.au>
+               Added MTRRIOC_KILL_ENTRY ioctl(2)
+               Trap for counter underflow in <mtrr_file_del>.
+               Trap for 4 MiB aligned regions for PPro, stepping <= 7.
+    19990301   Richard Gooch <rgooch@atnf.csiro.au>
+               Created <get_free_region> hook.
+    19990305   Richard Gooch <rgooch@atnf.csiro.au>
+               Temporarily disable AMD support now MTRR capability flag is set.
+  v1.32
+    19990308   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Adjust my changes (19990212-19990218) to Richard Gooch's
+               latest changes. (19990228-19990305)
+  v1.33
+    19990309   Richard Gooch <rgooch@atnf.csiro.au>
+               Fixed typo in <printk> message.
+    19990310   Richard Gooch <rgooch@atnf.csiro.au>
+               Support K6-II/III based on Alan Cox's <alan@redhat.com> patches.
+  v1.34
+    19990511   Bart Hartgers <bart@etpmod.phys.tue.nl>
+               Support Centaur C6 MCR's.
+    19990512   Richard Gooch <rgooch@atnf.csiro.au>
+               Minor cleanups.
+  v1.35
+    19990707   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Check whether ARR3 is protected in cyrix_get_free_region()
+               and mtrr_del(). The code won't attempt to delete or change it
+               from now on if the BIOS protected ARR3. It silently skips ARR3
+               in cyrix_get_free_region() or returns with an error code from
+               mtrr_del().
+    19990711   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Reset some bits in the CCRs in cyrix_arr_init() to disable SMM
+               if ARR3 isn't protected. This is needed because if SMM is active
+               and ARR3 isn't protected then deleting and setting ARR3 again
+               may lock up the processor. With SMM entirely disabled, it does
+               not happen.
+    19990812   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Rearrange switch() statements so the driver accomodates to
+               the fact that the AMD Athlon handles its MTRRs the same way
+               as Intel does.
+    19990814   Zoltán Böszörményi <zboszor@mail.externet.hu>
+               Double check for Intel in mtrr_add()'s big switch() because
+               that revision check is only valid for Intel CPUs.
+    19990819   Alan Cox <alan@redhat.com>
+               Tested Zoltan's changes on a pre production Athlon - 100%
+               success.
+    19991008   Manfred Spraul <manfreds@colorfullife.com>
+               replaced spin_lock_reschedule() with a normal semaphore.
+  v1.36
+    20000221   Richard Gooch <rgooch@atnf.csiro.au>
+               Compile fix if procfs and devfs not enabled.
+               Formatting changes.
+  v1.37
+    20001109   H. Peter Anvin <hpa@zytor.com>
+               Use the new centralized CPU feature detects.
+
+  v1.38
+    20010309   Dave Jones <davej@suse.de>
+               Add support for Cyrix III.
+
+  v1.39
+    20010312   Dave Jones <davej@suse.de>
+               Ugh, I broke AMD support.
+               Reworked fix by Troels Walsted Hansen <troels@thule.no>
+
+  v1.40
+    20010327   Dave Jones <davej@suse.de>
+               Adapted Cyrix III support to include VIA C3.
+
+  v2.0
+    20020306   Patrick Mochel <mochel@osdl.org>
+               Split mtrr.c -> mtrr/*.c
+               Converted to Linux Kernel Coding Style
+               Fixed several minor nits in form
+               Moved some SMP-only functions out, so they can be used
+                for power management in the future.
+               TODO: Fix user interface cruft.