Addendum fixes to ca370b49 (r52239) and a965ca6b (r52409).
- Fix the comments to explain what is really happening.
- Fix the boundary calculations in VidDisplayString() so that we can
correctly display a character in the very last column before going
to the next line, and fix similarly the vertical boundary calculation.
- Port the fixes to the ARM code.
- Import cmdcnst.h and vga.h headers from the 'vga_new' VGA Miniport Driver,
that contain definitions related to VGA registers as well as command-stream
functionality.
- Replace a bunch of hardcoded values by their corresponding defintions.
- Replace "Captain-Obvious" comments in VgaIsPresent() with actual
explanations from the corresponding function in 'vga_new'.
- Simplify the VgaInterpretCmdStream() function, based on the
corresponding one from 'vga_new'.
- Use concise comments in the 'AT_Initialization' command stream definition.
- Import the 'VGA_640x480' initialization command stream from 'vga_new'
and use it as the full VGA initialization stream whenever the HAL
does not handle the VGA display (HalResetDisplay() returning FALSE).
Otherwise we just use the 'AT_Initialization' command stream that
performs minimal initialization.
- Remove unused AT_Initialization and other declarations from ARM build.
- VgaIsPresent(): Re-select the memory mode register before playing
around with the sequencer flag. Otherwise the VGA may not be detected
correctly from time to time.
- VidInitialize(): Simplify the initialization loop, reset AddressSpace
to its "default" value of 1 when calling HalFindBusAddressTranslation()
on 'NullAddress'.
There is no need to compile our DLLs as shared libraries since we are
managing symbols exports and imports through spec files.
On my system, this reduces the configure-time by a factor of two.
