Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

A rewrite of the i810 bits of the agp(4) driver. New driver supports
operations required by GEMified i915.ko. It also attaches to SandyBridge
and IvyBridge CPU northbridges now.

Sponsored by: The FreeBSD Foundation
MFC after: 1 month

Correctly handle Intel g33 chips and add support for g45 chips

g33 based chips use a different method of identifying the gtt size.
g45 based chips gtt is located in a different area of stolen memory.

Approved by: jhb (mentor)
MFC after: 2 weeks

Add support for G965/Q965/GM965/GME965/GME945 AGP.

This adds a function to agp.c to set the aperture resource ID if it's
not the usual AGP_APBASE. Previously, agp.c had been assuming
AGP_APBASE, which resulted in incorrect agp_info, and contortions by
agp_i810.c to work around it.

This also adds functions to agp.c for default AGP_GET_APERTURE() and
AGP_SET_APERTURE(), which return the aperture resource size and disallow
aperture size changes. Moving to these for our AGP drivers will likely
result in stability improvements. This should fix 855-class aperture
size detection.

Additionally, refuse to attach agp_i810 when some RAM is above 4GB and
the GART can't reference memory that high. This should be very rare.
The correct solution would be bus_dma conversion for agp, which is
beyond the scope of this change. Other AGP drivers could likely use
this change as well.

G33/Q35/Q33 AGP support is also included, but disconnected by default
due to lack of testing.

PR: kern/109724 (855 aperture issue)
Submitted by: FUJIMOTO Kou<fujimoto@j.dendai.ac.jp>
Approved by: re (hrs)

- Clean up Aperture Access Global Enable (APEN) bit access.
- Rename confusing AGP_INTEL_I845_MCHCFG to AGP_INTEL_I845_AGPM.
- Move E7205 and E7505 from i8x5 to i8x0 family. It probably worked
because the actual offset is the same.

In fact, all three families have the bit at the exact same place. Only
differences are name and width of the registers, i.e., NBXCFG (0x50, dword),
RDCR (0x51, byte), AGPM (0x51, byte), MCHCFG (0x50, word) depending on
the family of the chipsets.

- Use PCIR_BAR() macro for the BAR for the aperture.
- Axe macros used for walking PCI capabilities list. We now ask the PCI
bus to find caps for us rather than doing it in the drm and agp drivers.

Add support for i915 GMCH AGP. This diff is a combination of work by myself
and some fixes from Motomichi Matsuzaki. Testing involved many people, but the
final, successful testing was from rwatson who endured several rounds of "it
crashes at XYZ stage" "oh, please correct this typo and try again." The Linux
driver, and to a small extent the limited specs, were both used as a reference
for how to program the chipset.

PR: kern/80396
Submitted by: Martin Mersberger

- Add a work-around for nForce3-250. Aperture base address encoded in misc.
control register and AGP bridge seems to be inconsistent with some BIOS.
Instead of relying on BIOS settings, we just take the initial aperture size
and encode them for both miscellaneous control register and AGP bridge.
Some idea was borrowed from agp_nvidia.c.

- Add preliminary ULi M1689 chipset support. The idea was taken from Linux
because hardware and documentation are unavailable. Not tested.

- Add more VIA chipset PCI IDs taken from Linux driver.

Approved by: anholt (mentor)
Tested by: Adam Gregoire <ebola at psychoholics dot org>
Ganael Laplanche <ganael.laplanche at martymac dot com>
K Wieland <kwieland at wustl dot edu>

Add a new AGP driver for ATI IGP chipsets. The driver is based on reading of
the Linux driver, since specs are unavailable. Many thanks to Adam Kirchhoff
for multiple useful testing cycles, and Ralf Wostrack for the final fix to get
it working.

PR: i386/75251
Submitted by: anholt

AMD64 on-CPU GART support.
This also applies to AMD64 HW running 'i386' OS.

Submitted by: Jung-uk Kim <jkim@niksun.com>
Integration by: obrien

Minimal fix to prevent crashes when an AGP v2 card is used with the new v3 VIA
chipsets, based on Linux's via-agp.c. On boot, the system selects which AGP
version to use based on the inserted card. If v2 was chosen, the chipset
needs to be programmed with the v2 registers still. Also included in kern/69953
are changes to make the programming of the v3 registers match linux, but that
will be left out until the need to do so is confirmed (want specs or a tester).

PR: kern/69953
Submitted by: Oleg Sharoiko <os@rsu.ru>
Tested by: Oleg Sharoiko <os@rsu.ru>, Geoff Speicher <geoff@speicher.org>
(full version from PR)

Different VIA host bridges use different offsets to their AGP config
registers, so add a register offset array to the softc. We key off the
device ID to determine which set of register offsets. Currently the 8385
host bridge used on amd64 is the only bridge to use the AGP3_VIA_*
register offsets and all other bridges use the AGP_VIA_* offsets. It is
currently unclear if the AGP3_VIA_* offsets are for VIA bridges that
implement AGP 3.0 bridges or just for amd64 bridges.

Submitted by: Kenneth Culver culverk at sweetdreamsracing dot biz

Add register definitions for the status and command registers for AGP.

PR: 64846
Submitted by: Samy Al Bahra

AGP GART driver for NVIDIA nForce/nForce2 chipsets.

Add support for the Intel 865 chipset.

MFC after: 3 days
Sponsored by: The Weather Channel
Approved by: re (murray)

Add agpreg.h missed in commit to agp_i810 (adding i85x/i86x AGP support).

Add AGP support for Intel i830M and i845 thanks to patches from moto kawasaki
<kawasaki@mbg.sphere.ne.jp> and David Dawes <dawes@XFree86.org>.

This patch will fix the lockups associated with AMD 751,761,762 based AGP
controllers. There still seems to be some issues with the DRI copying code
for some adapters, at least it doesn't hang the system now. Input would be
appreciated.

PR: 32301
Obtained from: Eric Anhlot <eanholt@gladstone.uoregon.edu>, Joe <joeo@nks.net>

Add support for Intel's i820/i840/i845/i850/i860 chipset.

Submitted by: nork@cityfujisawa.ne.jp (Norikatsu Shigemura)
PR: kern/31559, kern/31825
MFC after: 1 week

Add support for Intel's i810 chipset with integrated graphics. An
associated patch to XFree86 allows the X server to work with this chipset
on FreeBSD. Additional work will include porting the Linux 3D driver.

Submitted by: Ruslan Ermilov <ru@FreeBSD.org>

Fix the AMD 751 AGP minidriver so that it works with my test code.

A driver for programming the AGP hardware. This is only very lightly
tested on Intel BX chipsets only. The other agp minidrivers are totally
untested.

The programming api is a subset of the Linux api and is only intended to
be enough for the X server to use. There is also an in-kernel api for the
use of other kernel modules such as the 3D DRI.