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[BOOTVID] Diverse enhancements.

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- 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.
This commit is contained in:
Hermès Bélusca-Maïto 2019-06-23 21:05:28 +02:00
parent a75e4db855
commit ede3fddad7
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7 changed files with 684 additions and 343 deletions
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48
drivers/base/bootvid/arm/bootdata.c
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@ -1,53 +1,5 @@
#include "precomp.h"
USHORT AT_Initialization[] =
{
0x10 | CMD_STREAM_READ, // Major Command = 0x10. Minor Command = 0x08.
0x3DA, // Index Status 1 Register Port Address
//
// This Stream performs a USHORT Array Indexed Write at port 0x3C0
//
0x20 | 0x01, // Major Command = 0x20. Minor Command = 0x01.
0x3C0, // Attribute Controller Data Register
0x10, // Loop Count = 16 (Number of Pallette Entries)
0x0, // Index to select (Index = 0, palettes)
0x00, // Palette 0
0x01, // Palette 1
0x02, // Palette 2
0x03, // Palette 3
0x04, // Palette 4
0x05, // Palette 5
0x06, // Palette 6
0x07, // Palette 7
0x08, // Palette 8
0x09, // Palette 9
0x0A, // Palette 10
0x0B, // Palette 11
0x0C, // Palette 12
0x0D, // Palette 13
0x0E, // Palette 14
0x0F, // Palette 15
//
// This Stream performs a UCHAR READ of port 0x3DA
//
0x10 | CMD_STREAM_READ, // Major Command = 0x10. Minor Command = 0x08.
0x3DA, // Index Status 1 Register Port Address
//
// This Stream performs a UCHAR WRITE of value 0x20 at port 0x3C0
//
0x10 | CMD_STREAM_WRITE, // Major Command = 0x10. Minor Command = 0x00.
0x3C0, // Attribute Controller Data Register
0x20, // Set Palette Address Source
//
// End of Stream Marker
//
0x0 // End of command stream
};
//
// The character generator is in natural order, top of char is first element.
// The used font is 8x13 from plan 9, copyright Markus Kuhn.