Generic SVGA layer:
Added function pointers of the banked mapping for use with add-on cards with their own mapping when the VGA card banked mapping is not active or viceversa (e.g.: XGA).
XGA-1/2:
1. Reimplemented Area Fill and Boundary Mode as best as possible.
2. Fixed conflicts with banked mapping with VGA clones.
3. Fixed inverted colors (again) on accelerated 16bpp mode under OS/2.
Video7 with ATI 8514/A add-on.
Added a workaround (BIOS issue? I don't know) that disables 8514/A mode and reenables VGA mode when needed. Fixes screen freezes and polling issues with various drivers for Windows and others.
8514/A changes:
1. Correct interlaced display resolution.
2. Added a limit to cursor coordinates.
3. Test/WIP features of the add-on Mach8 side (ATI 8514/A Ultra) such as configurable BIOS.
4. Made the CMD 5 of the acceleration (Polygon Boundary) more accurate per manual (as much as I could regarding the clipping).
Cirrus related:
1. Added SUBSYS PCI vendor/device ID of the 5480 (per manual).
IBM VGA:
1. Built-in/option rom-less VGA don't need the "available" flag.
ATI Mach8/32:
1. As with 8514/A, corrected interlaced display.
XGA-1/-2:
1. Moved the XGA R/W memory size tests out of the SVGA R/W routines to reflect the per card basis, although anything that uses its own SVGA mapping would call the tests there (such as Cirrus, Headland and ATI) when not accessing the LFB. This finally puts an end to the XGA MCA mapping enabling bugs.
2. Re-organized the ISA standalone and non-standalone (INMOS) sides of the chips so that they work properly and remove the FILE rom loading hack from init.
3. The Memory Mapped R/W sides now account for instance in their address range.
4. INMOS only: prevent any ROM address access to anything lower than 0xc8000 to not conflict with the main BIOS rom loading.
5. Fixed native pitch by using the correct register, this fixes non 1024x768 resolutions under NT.
6. More logs when enabled to see any future bugs.
And cleanups as well.
Htotal/hblankstart are now applicable to the HT216-32 card only.
Re-apply the Radius ISA SVGA extensions port workaround until a proper ISA bios is found/dumped (warning: the HT209 may not work properly on the PS/1 2121 machine).
Properly fixed text/graphics mode of the S3 pre-ViRGE cards.
PIX TRANS cleanups.
Added a sanity check to banking, per bit 0 of CRTC31.
Initial implementation of Enhanced 4-bit mode.
911/924 chips use CRTC43 bit 3 for enabling 15/16bpp mode.
fb_only variable used correctly as of now (depending if on 4bit or 8bit+ modes).
S3 ViRGE changes part 2:
Made the Trio3D/2X AGP use the PCI_ADD_AGP part accordingly
RAMDAC changes:
Sierra 11483 and 11487 don't have an RS2 signal so the four times reading scheme of 0x3c6 is used instead, per documentation.
Fixed AT&T 49x bpp selection.
Other changes:
Fixed remaining rendering issues with the Radius SVGA HT209 card.
Fixed ET4000/W32 (without letters) hardware cursor.
Fixed non-interlaced 1280x1024x8bpp Cirrus mode in the 5434.
Added a note regarding the Radius (HT209) 8bpp render.
Reworked the TGUI9440, but still WIP.
Fixed 16 color in the Realtek 3106 card.
Reworked the Sierra 1148x for the second time.
Registers that only exist on 928/80x and up are not used by the 911/924 anymore.
