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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.
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