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[NTVDM]

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Implement Video Graphics Array (VGA) support.
Replace the old BIOS video code with new code that uses the VGA.


svn path=/branches/ntvdm/; revision=59648
This commit is contained in:
Aleksandar Andrejevic 2013-08-05 23:20:25 +00:00
parent b49476f20c
commit 455deb3bde
8 changed files with 1670 additions and 567 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
subsystems/ntvdm/CMakeLists.txt
View file

@ -8,6 +8,7 @@ list(APPEND SOURCE
pic.c
timer.c
ps2.c
vga.c
ntvdm.c
ntvdm.rc)

917
subsystems/ntvdm/bios.c
View file

File diff suppressed because it is too large Load diff

35
subsystems/ntvdm/bios.h
View file

@ -15,7 +15,6 @@
/* DEFINES ********************************************************************/
#define CONSOLE_VIDEO_MEM_END 0xBFFFF
#define ROM_AREA_START 0xE0000
#define ROM_AREA_END 0xFFFFF
#define BDA_SEGMENT 0x40
@ -32,18 +31,19 @@
#define BIOS_EQUIPMENT_LIST 0x2C // HACK: Disable FPU for now
#define BIOS_DEFAULT_VIDEO_MODE 0x03
#define BIOS_MAX_PAGES 8
#define BIOS_PAGE_SIZE 0x1000
#define BIOS_MAX_VIDEO_MODE 0x13
#define DEFAULT_ATTRIBUTE 0x07
#define GRAPHICS_VIDEO_SEG 0xA000
#define TEXT_VIDEO_SEG 0xB800
typedef struct
enum
{
DWORD Width;
DWORD Height;
BOOLEAN Text;
BYTE Bpp;
BOOLEAN Gray;
BYTE Pages;
WORD Segment;
} VIDEO_MODE;
SCROLL_DIRECTION_UP,
SCROLL_DIRECTION_DOWN,
SCROLL_DIRECTION_LEFT,
SCROLL_DIRECTION_RIGHT
};
#pragma pack(push, 1)
@ -91,6 +91,8 @@ typedef struct
BYTE ComTimeOut[4];
WORD KeybdBufferStart;
WORD KeybdBufferEnd;
BYTE ScreenRows;
WORD CharacterHeight;
} BIOS_DATA_AREA, *PBIOS_DATA_AREA;
#pragma pack(pop)
@ -99,10 +101,8 @@ typedef struct
BOOLEAN BiosInitialize(VOID);
VOID BiosCleanup(VOID);
VOID BiosUpdateConsole(ULONG StartAddress, ULONG EndAddress);
VOID BiosUpdateVideoMemory(ULONG StartAddress, ULONG EndAddress);
inline DWORD BiosGetVideoMemoryStart(VOID);
inline VOID BiosVerticalRefresh(VOID);
BYTE BiosGetVideoMode(VOID);
BOOLEAN BiosSetVideoMode(BYTE ModeNumber);
WORD BiosPeekCharacter(VOID);
WORD BiosGetCharacter(VOID);
VOID BiosVideoService(LPWORD Stack);
@ -111,5 +111,12 @@ VOID BiosKeyboardService(LPWORD Stack);
VOID BiosTimeService(LPWORD Stack);
VOID BiosHandleIrq(BYTE IrqNumber, LPWORD Stack);
VOID BiosSystemTimerInterrupt(LPWORD Stack);
BOOLEAN BiosScrollWindow(
INT Direction,
DWORD Amount,
SMALL_RECT Rectangle,
BYTE Page,
BYTE FillAttribute
);
#endif

9
subsystems/ntvdm/dos.h
View file

@ -98,6 +98,15 @@ typedef struct _DOS_INPUT_BUFFER
CHAR Buffer[ANYSIZE_ARRAY];
} DOS_INPUT_BUFFER, *PDOS_INPUT_BUFFER;
typedef struct _DOS_DRIVER_HEADER
{
DWORD NextDriver;
WORD Attributes;
WORD StrategyEntry;
WORD InterruptEntry;
CHAR DeviceName[8];
} DOS_DRIVER_HEADER, *PDOS_DRIVER_HEADER;
#pragma pack(pop)
/* FUNCTIONS ******************************************************************/

76
subsystems/ntvdm/emulator.c
View file

@ -13,6 +13,7 @@
#include "emulator.h"
#include "bios.h"
#include "dos.h"
#include "vga.h"
#include "pic.h"
#include "ps2.h"
#include "timer.h"
@ -40,17 +41,19 @@ static VOID EmulatorReadMemory(PVOID Context, UINT Address, LPBYTE Buffer, INT S
/* Make sure the requested address is valid */
if ((Address + Size) >= MAX_ADDRESS) return;
/* Are we reading some of the console video memory? */
if (((Address + Size) >= BiosGetVideoMemoryStart())
&& (Address < CONSOLE_VIDEO_MEM_END))
{
/* Call the VDM BIOS to update the video memory */
BiosUpdateVideoMemory(max(Address, BiosGetVideoMemoryStart()),
min(Address + Size, CONSOLE_VIDEO_MEM_END));
}
/* Read the data from the virtual address space and store it in the buffer */
RtlCopyMemory(Buffer, (LPVOID)((ULONG_PTR)BaseAddress + Address), Size);
/* Check if we modified the console video memory */
if (((Address + Size) >= VgaGetVideoBaseAddress())
&& (Address < VgaGetVideoLimitAddress()))
{
DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
LPBYTE VgaBuffer = &Buffer[VgaAddress - Address];
/* Read from the VGA memory */
VgaReadMemory(VgaAddress, VgaBuffer, Size);
}
}
static VOID EmulatorWriteMemory(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
@ -68,12 +71,14 @@ static VOID EmulatorWriteMemory(PVOID Context, UINT Address, LPBYTE Buffer, INT
RtlCopyMemory((LPVOID)((ULONG_PTR)BaseAddress + Address), Buffer, Size);
/* Check if we modified the console video memory */
if (((Address + Size) >= BiosGetVideoMemoryStart())
&& (Address < CONSOLE_VIDEO_MEM_END))
if (((Address + Size) >= VgaGetVideoBaseAddress())
&& (Address < VgaGetVideoLimitAddress()))
{
/* Call the VDM BIOS to update the screen */
BiosUpdateConsole(max(Address, BiosGetVideoMemoryStart()),
min(Address + Size, CONSOLE_VIDEO_MEM_END));
DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
LPBYTE VgaBuffer = &Buffer[VgaAddress - Address];
/* Write to the VGA memory */
VgaWriteMemory(VgaAddress, VgaBuffer, Size);
}
}
@ -115,6 +120,26 @@ static VOID EmulatorReadIo(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
break;
}
case VGA_AC_WRITE:
case VGA_AC_READ:
case VGA_SEQ_INDEX:
case VGA_SEQ_DATA:
case VGA_DAC_READ_INDEX:
case VGA_DAC_WRITE_INDEX:
case VGA_DAC_DATA:
case VGA_MISC_READ:
case VGA_MISC_WRITE:
case VGA_CRTC_INDEX:
case VGA_CRTC_DATA:
case VGA_GC_INDEX:
case VGA_GC_DATA:
case VGA_STAT_MONO:
case VGA_STAT_COLOR:
{
*Buffer = VgaReadPort(Address);
break;
}
default:
{
DPRINT1("Read from unknown port: 0x%X\n", Address);
@ -168,6 +193,26 @@ static VOID EmulatorWriteIo(PVOID Context, UINT Address, LPBYTE Buffer, INT Size
break;
}
case VGA_AC_WRITE:
case VGA_AC_READ:
case VGA_SEQ_INDEX:
case VGA_SEQ_DATA:
case VGA_DAC_READ_INDEX:
case VGA_DAC_WRITE_INDEX:
case VGA_DAC_DATA:
case VGA_MISC_READ:
case VGA_MISC_WRITE:
case VGA_CRTC_INDEX:
case VGA_CRTC_DATA:
case VGA_GC_INDEX:
case VGA_GC_DATA:
case VGA_STAT_MONO:
case VGA_STAT_COLOR:
{
VgaWritePort(Address, Byte);
break;
}
default:
{
DPRINT1("Write to unknown port: 0x%X\n", Address);
@ -478,6 +523,9 @@ VOID EmulatorStep(VOID)
/* Skip the opcodes */
EmulatorContext.state->reg_ip += 4;
// HACK: Refresh the display because the called function may wait.
VgaRefreshDisplay();
/* Call the BOP handler */
EmulatorBop(Instruction[1]);
}

25
subsystems/ntvdm/ntvdm.c
View file

@ -13,6 +13,7 @@
#include "ntvdm.h"
#include "emulator.h"
#include "bios.h"
#include "vga.h"
#include "dos.h"
#include "timer.h"
#include "pic.h"
@ -137,7 +138,7 @@ INT wmain(INT argc, WCHAR *argv[])
DisplayMessage(L"Could not start program: %S", CommandLine);
return -1;
}
/* Set the last timer tick to the current time */
QueryPerformanceCounter(&LastTimerTick);
@ -146,18 +147,18 @@ INT wmain(INT argc, WCHAR *argv[])
{
/* Get the current number of ticks */
CurrentTickCount = GetTickCount();
/* Get the current performance counter value */
QueryPerformanceCounter(&Counter);
/* Get the number of PIT ticks that have passed */
TimerTicks = ((Counter.QuadPart - LastTimerTick.QuadPart)
* PIT_BASE_FREQUENCY) / Frequency.QuadPart;
/* Update the PIT */
for (i = 0; i < TimerTicks; i++) PitDecrementCount();
LastTimerTick = Counter;
/* Check for console input events every millisecond */
if (CurrentTickCount != LastTickCount)
{
@ -165,20 +166,23 @@ INT wmain(INT argc, WCHAR *argv[])
LastTickCount = CurrentTickCount;
}
/* Check for vertical refresh */
/* Check for vertical retrace */
if ((CurrentTickCount - LastVerticalRefresh) >= 16)
{
BiosVerticalRefresh();
VgaRefreshDisplay();
LastVerticalRefresh = CurrentTickCount;
}
/* Horizontal retrace occurs as fast as possible */
VgaHorizontalRetrace();
/* Continue CPU emulation */
for (i = 0; (i < STEPS_PER_CYCLE) && VdmRunning; i++)
{
EmulatorStep();
Cycles++;
}
if ((CurrentTickCount - LastCyclePrintout) >= 1000)
{
DPRINT1("NTVDM: %d Instructions Per Second\n", Cycles);
@ -187,6 +191,9 @@ INT wmain(INT argc, WCHAR *argv[])
}
}
/* Perform another screen refresh */
VgaRefreshDisplay();
Cleanup:
BiosCleanup();
EmulatorCleanup();

974
subsystems/ntvdm/vga.c Normal file
View file

@ -0,0 +1,974 @@
/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: vga.c
* PURPOSE: VGA hardware emulation
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
/* INCLUDES *******************************************************************/
#define NDEBUG
#include "vga.h"
#include "bios.h"
/* PRIVATE VARIABLES **********************************************************/
static BYTE VgaMemory[VGA_NUM_BANKS * VGA_BANK_SIZE];
static BYTE VgaMiscRegister;
static BYTE VgaSeqIndex = VGA_SEQ_RESET_REG;
static BYTE VgaSeqRegisters[VGA_SEQ_MAX_REG];
static BYTE VgaGcIndex = VGA_GC_RESET_REG;
static BYTE VgaGcRegisters[VGA_GC_MAX_REG];
static BYTE VgaCrtcIndex = VGA_CRTC_HORZ_TOTAL_REG;
static BYTE VgaCrtcRegisters[VGA_CRTC_MAX_REG];
static BYTE VgaAcIndex = VGA_AC_PAL_0_REG;
static BOOLEAN VgaAcLatch = FALSE;
static BYTE VgaAcRegisters[VGA_AC_MAX_REG];
static BYTE VgaDacIndex = 0;
static BOOLEAN VgaDacReadWrite = FALSE;
static BYTE VgaDacRegisters[VGA_PALETTE_SIZE];
static BOOLEAN InVerticalRetrace = FALSE;
static BOOLEAN InHorizontalRetrace = FALSE;
static HANDLE TextConsoleBuffer = NULL;
static HANDLE GraphicsConsoleBuffer = NULL;
static LPVOID ConsoleFramebuffer = NULL;
static HANDLE ConsoleMutex = NULL;
static BOOLEAN NeedsUpdate = FALSE;
static BOOLEAN ModeChanged = TRUE;
static BOOLEAN CursorMoved = FALSE;
static BOOLEAN TextMode = TRUE;
static SMALL_RECT UpdateRectangle = { 0, 0, 0, 0 };
/* PRIVATE FUNCTIONS **********************************************************/
static inline INT VgaGetAddressSize(VOID)
{
if (VgaCrtcRegisters[VGA_CRTC_UNDERLINE_REG] & VGA_CRTC_UNDERLINE_DWORD)
{
/* Double-word addressing */
return 4;
}
if (VgaCrtcRegisters[VGA_CRTC_MODE_CONTROL_REG] & VGA_CRTC_MODE_CONTROL_BYTE)
{
/* Byte addressing */
return 1;
}
/* Word addressing */
return 2;
}
static inline DWORD VgaTranslateReadAddress(DWORD Address)
{
CONST DWORD MemoryBase[] = { 0xA0000, 0xA0000, 0xB0000, 0xB8000 };
DWORD Offset = Address - MemoryBase[(VgaGcRegisters[VGA_GC_MISC_REG] >> 2) & 0x03];
BYTE Plane;
/* Check for chain-4 and odd-even mode */
if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
{
/* The lowest two bits are the plane number */
Plane = Offset & 3;
Offset >>= 2;
}
else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
/* The LSB is the plane number */
Plane = Offset & 1;
Offset >>= 1;
}
else
{
/* Use the read mode */
Plane = VgaGcRegisters[VGA_GC_READ_MAP_SEL_REG] & 0x03;
}
/* Multiply the offset by the address size */
Offset *= VgaGetAddressSize();
return Offset + Plane * VGA_BANK_SIZE;
}
static inline DWORD VgaTranslateWriteAddress(DWORD Address)
{
CONST DWORD MemoryBase[] = { 0xA0000, 0xA0000, 0xB0000, 0xB8000 };
DWORD Offset = Address - MemoryBase[(VgaGcRegisters[VGA_GC_MISC_REG] >> 2) & 0x03];
/* Check for chain-4 and odd-even mode */
if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
{
/* Shift the offset to the right by 2 */
Offset >>= 2;
}
else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
/* Shift the offset to the right by 1 */
Offset >>= 1;
}
/* Multiply the offset by the address size */
Offset *= VgaGetAddressSize();
/* Return the offset on plane 0 */
return Offset;
}
static inline VOID VgaMarkForUpdate(SHORT Row, SHORT Column)
{
DPRINT("VgaMarkForUpdate: Row %d, Column %d\n", Row, Column);
/* Check if this is the first time the rectangle is updated */
if (!NeedsUpdate)
{
UpdateRectangle.Left = UpdateRectangle.Top = (SHORT)0x7FFF;
UpdateRectangle.Right = UpdateRectangle.Bottom = (SHORT)0x8000;
}
/* Expand the rectangle to include the point */
UpdateRectangle.Left = min(UpdateRectangle.Left, Column);
UpdateRectangle.Right = max(UpdateRectangle.Right, Column);
UpdateRectangle.Top = min(UpdateRectangle.Top, Row);
UpdateRectangle.Bottom = max(UpdateRectangle.Bottom, Row);
/* Set the update request flag */
NeedsUpdate = TRUE;
}
static VOID VgaWriteSequencer(BYTE Data)
{
ASSERT(VgaSeqIndex < VGA_SEQ_MAX_REG);
/* Save the value */
VgaSeqRegisters[VgaSeqIndex] = Data;
}
static VOID VgaWriteGc(BYTE Data)
{
ASSERT(VgaGcIndex < VGA_GC_MAX_REG);
/* Save the value */
VgaGcRegisters[VgaGcIndex] = Data;
/* Check the index */
switch (VgaGcIndex)
{
case VGA_GC_MISC_REG:
{
/* The GC misc register decides if it's text or graphics mode */
ModeChanged = TRUE;
break;
}
}
}
static VOID VgaWriteCrtc(BYTE Data)
{
ASSERT(VgaGcIndex < VGA_CRTC_MAX_REG);
/* Save the value */
VgaCrtcRegisters[VgaCrtcIndex] = Data;
/* Check the index */
switch (VgaCrtcIndex)
{
case VGA_CRTC_END_HORZ_DISP_REG:
case VGA_CRTC_VERT_DISP_END_REG:
case VGA_CRTC_OVERFLOW_REG:
{
/* The video mode has changed */
ModeChanged = TRUE;
break;
}
case VGA_CRTC_CURSOR_LOC_LOW_REG:
case VGA_CRTC_CURSOR_LOC_HIGH_REG:
case VGA_CRTC_CURSOR_START_REG:
case VGA_CRTC_CURSOR_END_REG:
{
/* Set the cursor moved flag */
CursorMoved = TRUE;
break;
}
}
}
static VOID VgaWriteDac(BYTE Data)
{
/* Set the value */
VgaDacRegisters[VgaDacIndex++] = Data;
VgaDacIndex %= VGA_PALETTE_SIZE;
// TODO: Change the palette!
}
static VOID VgaWriteAc(BYTE Data)
{
ASSERT(VgaAcIndex < VGA_AC_MAX_REG);
/* Save the value */
VgaAcRegisters[VgaAcIndex] = Data;
}
static VOID VgaEnterGraphicsMode(UINT Width, UINT Height, UINT BitDepth)
{
INT i;
CONSOLE_GRAPHICS_BUFFER_INFO GraphicsBufferInfo;
BYTE BitmapInfoBuffer[VGA_BITMAP_INFO_SIZE];
LPBITMAPINFO BitmapInfo = (LPBITMAPINFO)BitmapInfoBuffer;
LPWORD PaletteIndex = (LPWORD)(BitmapInfoBuffer + sizeof(BITMAPINFOHEADER));
/* Fill the bitmap info header */
ZeroMemory(&BitmapInfo->bmiHeader, sizeof(BITMAPINFOHEADER));
BitmapInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
BitmapInfo->bmiHeader.biWidth = Width;
BitmapInfo->bmiHeader.biHeight = Height;
BitmapInfo->bmiHeader.biBitCount = 8;
BitmapInfo->bmiHeader.biPlanes = 1;
BitmapInfo->bmiHeader.biCompression = BI_RGB;
BitmapInfo->bmiHeader.biSizeImage = Width * Height * (BitDepth / 8);
/* Fill the palette data */
for (i = 0; i < BitDepth; i++) PaletteIndex[i] = i;
/* Fill the console graphics buffer info */
GraphicsBufferInfo.dwBitMapInfoLength = VGA_BITMAP_INFO_SIZE;
GraphicsBufferInfo.lpBitMapInfo = BitmapInfo;
GraphicsBufferInfo.dwUsage = DIB_PAL_COLORS;
/* Create the buffer */
GraphicsConsoleBuffer = CreateConsoleScreenBuffer(GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
CONSOLE_GRAPHICS_BUFFER,
&GraphicsBufferInfo);
/* Save the framebuffer address and mutex */
ConsoleFramebuffer = GraphicsBufferInfo.lpBitMap;
ConsoleMutex = GraphicsBufferInfo.hMutex;
/* Set the active buffer */
SetConsoleActiveScreenBuffer(GraphicsConsoleBuffer);
}
static VOID VgaLeaveGraphicsMode()
{
/* Switch back to the text buffer */
SetConsoleActiveScreenBuffer(TextConsoleBuffer);
/* Cleanup the video data */
CloseHandle(ConsoleMutex);
CloseHandle(GraphicsConsoleBuffer);
GraphicsConsoleBuffer = NULL;
}
static VOID VgaUpdateMode(VOID)
{
COORD Resolution = VgaGetDisplayResolution();
if (!TextMode)
{
/* Switching from graphics mode to text mode */
VgaLeaveGraphicsMode();
}
else
{
/* Free the old framebuffer */
HeapFree(GetProcessHeap(), 0, ConsoleFramebuffer);
ConsoleFramebuffer = NULL;
}
/* Check if the new mode is alphanumeric */
if (!(VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA))
{
/* Resize the console */
SetConsoleScreenBufferSize(TextConsoleBuffer, Resolution);
/* Allocate a framebuffer */
ConsoleFramebuffer = HeapAlloc(GetProcessHeap(),
HEAP_ZERO_MEMORY,
sizeof(CHAR_INFO)
* Resolution.X
* Resolution.Y);
if (ConsoleFramebuffer == NULL)
{
DisplayMessage(L"An unexpected error occurred!\n");
VdmRunning = FALSE;
return;
}
/* Set the text mode flag */
TextMode = TRUE;
}
else
{
/* Enter 8-bit graphics mode */
VgaEnterGraphicsMode(Resolution.X, Resolution.Y, 8);
/* Clear the text mode flag */
TextMode = FALSE;
}
/* Perform a full update */
NeedsUpdate = TRUE;
UpdateRectangle.Left = 0;
UpdateRectangle.Top = 0;
UpdateRectangle.Right = Resolution.X;
UpdateRectangle.Bottom = Resolution.Y;
}
static VOID VgaUpdateFramebuffer(VOID)
{
INT i, j, k;
COORD Resolution = VgaGetDisplayResolution();
INT AddressSize = VgaGetAddressSize();
DWORD Address = (VgaCrtcRegisters[VGA_CRTC_START_ADDR_HIGH_REG] << 8)
+ VgaCrtcRegisters[VGA_CRTC_START_ADDR_LOW_REG];
DWORD ScanlineSize = (DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG] * 2;
PCHAR_INFO CharBuffer = (PCHAR_INFO)ConsoleFramebuffer;
PBYTE GraphicsBuffer = (PBYTE)ConsoleFramebuffer;
/* Loop through the scanlines */
for (i = 0; i < Resolution.Y; i++)
{
/* Check if this is text mode or graphics mode */
if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
{
/* Graphics mode */
/* Loop through the pixels */
for (j = 0; j < Resolution.X; j++)
{
BYTE PixelData = 0;
/* Check the shifting mode */
if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_SHIFT256)
{
/* 4 bits shifted from each plane */
/* Check if this is 16 or 256 color mode */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
/* One byte per pixel */
PixelData = VgaMemory[(j % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ (Address + (j / VGA_NUM_BANKS))
* AddressSize];
}
else
{
/* 4-bits per pixel */
PixelData = VgaMemory[(j % VGA_NUM_BANKS) * VGA_BANK_SIZE
+ (Address + (j / (VGA_NUM_BANKS * 2)))
* AddressSize];
/* Check if we should use the highest 4 bits or lowest 4 */
if (((j / VGA_NUM_BANKS) % 2) == 0)
{
/* Highest 4 */
PixelData >>= 4;
}
else
{
/* Lowest 4 */
PixelData &= 0x0F;
}
}
}
else if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_SHIFTREG)
{
/*
* 2 bits shifted from plane 0 and 2 for the first 4 pixels,
* then 2 bits shifted from plane 1 and 3 for the next 4
*/
// TODO: NOT IMPLEMENTED!
DPRINT1("Interleaved shift mode is not implemented!\n");
}
else
{
/* 1 bit shifted from each plane */
/* Check if this is 16 or 256 color mode */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT)
{
/* 8 bits per pixel, 2 on each plane */
for (k = 0; k < VGA_NUM_BANKS; k++)
{
/* The data is on plane k, 4 pixels per byte */
BYTE PlaneData = VgaMemory[k * VGA_BANK_SIZE
+ (Address + (j / 4)) * AddressSize];
/* The mask of the first bit in the pair */
BYTE BitMask = 1 << (((3 - (j % 4)) * 2) + 1);
/* Bits 0, 1, 2 and 3 come from the first bit of the pair */
if (PlaneData & BitMask) PixelData |= 1 << k;
/* Bits 4, 5, 6 and 7 come from the second bit of the pair */
if (PlaneData & (BitMask >> 1)) PixelData |= 1 << (k + 4);
}
}
else
{
/* 4 bits per pixel, 1 on each plane */
for (k = 0; k < VGA_NUM_BANKS; k++)
{
BYTE PlaneData = VgaMemory[k * VGA_BANK_SIZE
+ (Address + (j / 8)) * AddressSize];
/* If the bit on that plane is set, set it */
if (PlaneData & (1 << (7 - (j % 8)))) PixelData |= 1 << k;
}
}
}
/* Now check if the resulting pixel data has changed */
if (GraphicsBuffer[i * Resolution.X + j] != PixelData)
{
/* Yes, write the new value */
GraphicsBuffer[i * Resolution.X + j] = PixelData;
/* Mark the specified pixel as changed */
VgaMarkForUpdate(i, j);
}
}
}
else
{
/* Text mode */
/* Loop through the characters */
for (j = 0; j < Resolution.X; j++)
{
DWORD CurrentAddr = LOWORD((Address + j) * AddressSize);
CHAR_INFO CharInfo;
/* Plane 0 holds the character itself */
CharInfo.Char.AsciiChar = VgaMemory[CurrentAddr];
/* Plane 1 holds the attribute */
CharInfo.Attributes = VgaMemory[CurrentAddr + VGA_BANK_SIZE];
/* Now check if the resulting character data has changed */
if ((CharBuffer[i * Resolution.X + j].Char.AsciiChar != CharInfo.Char.AsciiChar)
|| (CharBuffer[i * Resolution.X + j].Attributes != CharInfo.Attributes))
{
/* Yes, write the new value */
CharBuffer[i * Resolution.X + j] = CharInfo;
/* Mark the specified pixel as changed */
VgaMarkForUpdate(i, j);
}
}
}
/* Move to the next scanline */
Address += ScanlineSize;
}
}
static VOID VgaUpdateTextCursor(VOID)
{
COORD Position;
CONSOLE_CURSOR_INFO CursorInfo;
BYTE CursorStart = VgaCrtcRegisters[VGA_CRTC_CURSOR_START_REG] & 0x3F;
BYTE CursorEnd = VgaCrtcRegisters[VGA_CRTC_CURSOR_END_REG] & 0x1F;
DWORD ScanlineSize = (DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG] * 2;
WORD Location = MAKEWORD(VgaCrtcRegisters[VGA_CRTC_CURSOR_LOC_LOW_REG],
VgaCrtcRegisters[VGA_CRTC_CURSOR_LOC_HIGH_REG]);
if (CursorStart < CursorEnd)
{
/* Visible cursor */
CursorInfo.bVisible = TRUE;
CursorInfo.dwSize = (100 * (CursorEnd - CursorStart)) >> 5;
}
else
{
/* No cursor */
CursorInfo.bVisible = FALSE;
CursorInfo.dwSize = 0;
}
/* Add the cursor skew to the location */
Location += (VgaCrtcRegisters[VGA_CRTC_CURSOR_END_REG] >> 5) & 3;
/* Find the coordinates of the new position */
Position.X = Location % ScanlineSize;
Position.Y = Location / ScanlineSize;
/* Update the physical cursor */
SetConsoleCursorInfo(TextConsoleBuffer, &CursorInfo);
SetConsoleCursorPosition(TextConsoleBuffer, Position);
}
/* PUBLIC FUNCTIONS ***********************************************************/
DWORD VgaGetVideoBaseAddress(VOID)
{
CONST DWORD MemoryBase[] = { 0xA0000, 0xA0000, 0xB0000, 0xB8000 };
return MemoryBase[(VgaGcRegisters[VGA_GC_MISC_REG] >> 2) & 0x03];
}
DWORD VgaGetVideoLimitAddress(VOID)
{
CONST DWORD MemoryLimit[] = { 0xA7FFF, 0xA7FFF, 0xB7FFF, 0xBFFFF };
return MemoryLimit[(VgaGcRegisters[VGA_GC_MISC_REG] >> 2) & 0x03];
}
COORD VgaGetDisplayResolution(VOID)
{
COORD Resolution;
/* The low 8 bits are in the display registers */
Resolution.X = VgaCrtcRegisters[VGA_CRTC_END_HORZ_DISP_REG];
Resolution.Y = VgaCrtcRegisters[VGA_CRTC_VERT_DISP_END_REG];
/* Set the top bits from the overflow register */
if (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VDE8)
{
Resolution.Y |= 1 << 8;
}
if (VgaCrtcRegisters[VGA_CRTC_OVERFLOW_REG] & VGA_CRTC_OVERFLOW_VDE9)
{
Resolution.Y |= 1 << 9;
}
/* Increase the values by 1 */
Resolution.X++;
Resolution.Y++;
if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
{
/* Multiply the horizontal resolution by the 9/8 dot mode */
Resolution.X *= (VgaSeqRegisters[VGA_SEQ_CLOCK_REG] & VGA_SEQ_CLOCK_98DM)
? 8 : 9;
/* The horizontal resolution is halved in 8-bit mode */
if (VgaAcRegisters[VGA_AC_CONTROL_REG] & VGA_AC_CONTROL_8BIT) Resolution.X /= 2;
/* Divide the vertical resolution by the maximum scan line */
Resolution.Y /= ((DWORD)VgaCrtcRegisters[VGA_CRTC_MAX_SCAN_LINE_REG] & 0x1F) + 1;
}
else
{
/* Divide the number of scanlines by the font size */
Resolution.Y /= 16;
}
/* Return the resolution */
return Resolution;
}
VOID VgaRefreshDisplay(VOID)
{
COORD Resolution = VgaGetDisplayResolution();
DPRINT("VgaRefreshDisplay\n");
if (ModeChanged)
{
/* Change the display mode */
VgaUpdateMode();
/* Reset the mode change flag */
ModeChanged = FALSE;
}
if (CursorMoved)
{
/* Change the text cursor location */
VgaUpdateTextCursor();
/* Reset the cursor move flag */
CursorMoved = FALSE;
}
/* Update the contents of the framebuffer */
VgaUpdateFramebuffer();
/* Set the vertical retrace flag */
InVerticalRetrace = TRUE;
/* Ignore if there's nothing to update */
if (!NeedsUpdate) return;
DPRINT("Updating screen rectangle (%d, %d, %d, %d)\n",
UpdateRectangle.Left,
UpdateRectangle.Top,
UpdateRectangle.Right,
UpdateRectangle.Bottom);
/* Check if this is text mode or graphics mode */
if (VgaGcRegisters[VGA_GC_MISC_REG] & VGA_GC_MISC_NOALPHA)
{
/* Graphics mode */
/* Redraw the screen */
InvalidateConsoleDIBits(GraphicsConsoleBuffer, &UpdateRectangle);
}
else
{
/* Text mode */
COORD Origin = { UpdateRectangle.Left, UpdateRectangle.Top };
/* Write the data to the console */
WriteConsoleOutputA(TextConsoleBuffer,
(PCHAR_INFO)ConsoleFramebuffer,
Resolution,
Origin,
&UpdateRectangle);
}
/* Clear the update flag */
NeedsUpdate = FALSE;
}
VOID VgaHorizontalRetrace(VOID)
{
/* Set the flag */
InHorizontalRetrace = TRUE;
}
VOID VgaReadMemory(DWORD Address, LPBYTE Buffer, DWORD Size)
{
INT i;
DPRINT("VgaReadMemory: Address 0x%08X, Size %lu\n",
Address,
Size);
/* Ignore if video RAM access is disabled */
if (!(VgaMiscRegister & VGA_MISC_RAM_ENABLED)) return;
/* Loop through each byte */
for (i = 0; i < Size; i++)
{
DWORD VideoAddress = VgaTranslateReadAddress(Address + i);
/* Copy the value to the buffer */
Buffer[i] = VgaMemory[VideoAddress];
}
}
VOID VgaWriteMemory(DWORD Address, LPBYTE Buffer, DWORD Size)
{
INT i, j;
DPRINT("VgaWriteMemory: Address 0x%08X, Size %lu\n",
Address,
Size);
/* Ignore if video RAM access is disabled */
if (!(VgaMiscRegister & VGA_MISC_RAM_ENABLED)) return;
/* Also ignore if write access to all planes is disabled */
if ((VgaSeqRegisters[VGA_SEQ_MASK_REG] & 0x0F) == 0x00) return;
/* Loop through each byte */
for (i = 0; i < Size; i++)
{
DWORD VideoAddress = VgaTranslateWriteAddress(Address + i);
for (j = 0; j < VGA_NUM_BANKS; j++)
{
/* Make sure the page is writeable */
if (!(VgaSeqRegisters[VGA_SEQ_MASK_REG] & (1 << j))) continue;
/* Check if this is chain-4 mode */
if (VgaSeqRegisters[VGA_SEQ_MEM_REG] & VGA_SEQ_MEM_C4)
{
if (((Address + i) & 3) != j)
{
/* This plane will not be accessed */
continue;
}
}
/* Check if this is odd-even mode */
if (VgaGcRegisters[VGA_GC_MODE_REG] & VGA_GC_MODE_OE)
{
if (((Address + i) & 1) != (j & 1))
{
/* This plane will not be accessed */
continue;
}
}
/* Copy the value to the VGA memory */
VgaMemory[VideoAddress + j * VGA_BANK_SIZE] = Buffer[i];
}
}
}
BYTE VgaReadPort(WORD Port)
{
DPRINT("VgaReadPort: Port 0x%04X\n", Port);
switch (Port)
{
case VGA_AC_INDEX:
{
return VgaAcIndex;
}
case VGA_AC_READ:
{
return VgaAcRegisters[VgaAcIndex];
}
case VGA_SEQ_INDEX:
{
return VgaSeqIndex;
}
case VGA_SEQ_DATA:
{
return VgaSeqRegisters[VgaSeqIndex];
}
case VGA_DAC_READ_INDEX:
{
/* This returns the read/write state */
return VgaDacReadWrite ? 0 : 3;
}
case VGA_DAC_WRITE_INDEX:
{
return VgaDacIndex;
}
case VGA_DAC_DATA:
{
/* Ignore reads in write mode */
if (!VgaDacReadWrite)
{
BYTE Data = VgaDacRegisters[VgaDacIndex++];
VgaDacIndex %= VGA_PALETTE_SIZE;
return Data;
}
break;
}
case VGA_MISC_READ:
{
return VgaMiscRegister;
}
case VGA_CRTC_INDEX:
{
return VgaCrtcIndex;
}
case VGA_CRTC_DATA:
{
return VgaCrtcRegisters[VgaCrtcIndex];
}
case VGA_GC_INDEX:
{
return VgaGcIndex;
}
case VGA_GC_DATA:
{
return VgaGcRegisters[VgaGcIndex];
}
case VGA_STAT_MONO:
case VGA_STAT_COLOR:
{
BYTE Result = 0;
/* Reset the AC latch */
VgaAcLatch = FALSE;
/* Set a flag if there is a vertical or horizontal retrace */
if (InVerticalRetrace || InHorizontalRetrace) Result |= VGA_STAT_DD;
/* Set an additional flag if there was a vertical retrace */
if (InVerticalRetrace) Result |= VGA_STAT_VRETRACE;
/* Clear the flags */
InHorizontalRetrace = InVerticalRetrace = FALSE;
return Result;
}
}
return 0;
}
VOID VgaWritePort(WORD Port, BYTE Data)
{
DPRINT("VgaWritePort: Port 0x%04X, Data 0x%02X\n", Port, Data);
switch (Port)
{
case VGA_AC_INDEX:
{
if (!VgaAcLatch)
{
/* Change the index */
if (Data < VGA_AC_MAX_REG) VgaAcIndex = Data;
}
else
{
/* Write the data */
VgaWriteAc(Data);
}
/* Toggle the latch */
VgaAcLatch = !VgaAcLatch;
break;
}
case VGA_SEQ_INDEX:
{
/* Set the sequencer index register */
if (Data < VGA_SEQ_MAX_REG) VgaSeqIndex = Data;
break;
}
case VGA_SEQ_DATA:
{
/* Call the sequencer function */
VgaWriteSequencer(Data);
break;
}
case VGA_DAC_READ_INDEX:
{
VgaDacReadWrite = FALSE;
VgaDacIndex = Data % VGA_PALETTE_SIZE;
break;
}
case VGA_DAC_WRITE_INDEX:
{
VgaDacReadWrite = TRUE;
VgaDacIndex = Data % VGA_PALETTE_SIZE;
break;
}
case VGA_DAC_DATA:
{
/* Ignore writes in read mode */
if (VgaDacReadWrite) VgaWriteDac(Data & 0x3F);
break;
}
case VGA_MISC_WRITE:
{
VgaMiscRegister = Data;
break;
}
case VGA_CRTC_INDEX:
{
/* Set the CRTC index register */
if (Data < VGA_CRTC_MAX_REG) VgaCrtcIndex = Data;
break;
}
case VGA_CRTC_DATA:
{
/* Call the CRTC function */
VgaWriteCrtc(Data);
break;
}
case VGA_GC_INDEX:
{
/* Set the GC index register */
if (Data < VGA_GC_MAX_REG) VgaGcIndex = Data;
break;
}
case VGA_GC_DATA:
{
/* Call the GC function */
VgaWriteGc(Data);
break;
}
}
}
VOID VgaInitialize(HANDLE TextHandle)
{
INT i, j;
COORD Resolution;
INT AddressSize;
DWORD ScanlineSize;
COORD Origin = { 0, 0 };
SMALL_RECT ScreenRect;
PCHAR_INFO CharBuffer;
DWORD Address = 0;
/* Set the global handle */
TextConsoleBuffer = TextHandle;
/* Set the default video mode */
BiosSetVideoMode(BIOS_DEFAULT_VIDEO_MODE);
VgaUpdateMode();
ModeChanged = FALSE;
/* Get the data */
Resolution = VgaGetDisplayResolution();
CharBuffer = (PCHAR_INFO)ConsoleFramebuffer;
AddressSize = VgaGetAddressSize();
ScreenRect.Left = ScreenRect.Top = 0;
ScreenRect.Right = Resolution.X;
ScreenRect.Bottom = Resolution.Y;
ScanlineSize = (DWORD)VgaCrtcRegisters[VGA_CRTC_OFFSET_REG] * 2;
/* Read the data from the console into the framebuffer */
ReadConsoleOutputA(TextConsoleBuffer,
ConsoleFramebuffer,
Resolution,
Origin,
&ScreenRect);
/* Loop through the scanlines */
for (i = 0; i < Resolution.Y; i++)
{
/* Loop through the characters */
for (j = 0; j < Resolution.X; j++)
{
DWORD CurrentAddr = LOWORD((Address + j) * AddressSize);
/* Store the character in plane 0 */
VgaMemory[CurrentAddr] = CharBuffer[i * Resolution.X + j].Char.AsciiChar;
/* Store the attribute in plane 1 */
VgaMemory[CurrentAddr + VGA_BANK_SIZE] = CharBuffer[i * Resolution.X + j].Attributes;
}
/* Move to the next scanline */
Address += ScanlineSize;
}
}
/* EOF */

200
subsystems/ntvdm/vga.h Normal file
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@ -0,0 +1,200 @@
/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: vga.h
* PURPOSE: VGA hardware emulation (header file)
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#ifndef _VGA_H_
#define _VGA_H_
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
/* DEFINES ********************************************************************/
/* Register I/O ports */
#define VGA_AC_INDEX 0x3C0
#define VGA_AC_WRITE 0x3C0
#define VGA_AC_READ 0x3C1
#define VGA_SEQ_INDEX 0x3C4
#define VGA_SEQ_DATA 0x3C5
#define VGA_DAC_READ_INDEX 0x3C7
#define VGA_DAC_WRITE_INDEX 0x3C8
#define VGA_DAC_DATA 0x3C9
#define VGA_MISC_READ 0x3CC
#define VGA_MISC_WRITE 0x3C2
#define VGA_CRTC_INDEX 0x3D4
#define VGA_CRTC_DATA 0x3D5
#define VGA_GC_INDEX 0x3CE
#define VGA_GC_DATA 0x3CF
#define VGA_STAT_MONO 0x3BA
#define VGA_STAT_COLOR 0x3DA
#define VGA_NUM_BANKS 4
#define VGA_BANK_SIZE 0x10000
#define VGA_PALETTE_SIZE 768
#define VGA_BITMAP_INFO_SIZE (sizeof(BITMAPINFOHEADER) + 2 * (VGA_PALETTE_SIZE / 3))
/* Sequencer reset register bits */
#define VGA_SEQ_RESET_AR (1 << 0)
#define VGA_SEQ_RESET_SR (1 << 1)
/* Sequencer clock register bits */
#define VGA_SEQ_CLOCK_98DM (1 << 0)
#define VGA_SEQ_CLOCK_SLR (1 << 2)
#define VGA_SEQ_CLOCK_DCR (1 << 3)
#define VGA_SEQ_CLOCK_S4 (1 << 4)
#define VGA_SEQ_CLOCK_SD (1 << 5)
/* Sequencer memory register bits */
#define VGA_SEQ_MEM_EXT (1 << 1)
#define VGA_SEQ_MEM_OE (1 << 2)
#define VGA_SEQ_MEM_C4 (1 << 3)
/* Graphics controller mode register bits */
#define VGA_GC_MODE_READ (1 << 3)
#define VGA_GC_MODE_OE (1 << 4)
#define VGA_GC_MODE_SHIFTREG (1 << 5)
#define VGA_GC_MODE_SHIFT256 (1 << 6)
/* Graphics controller miscellaneous register bits */
#define VGA_GC_MISC_NOALPHA (1 << 0)
#define VGA_GC_MISC_OE (1 << 1)
/* CRTC overflow register bits */
#define VGA_CRTC_OVERFLOW_VT8 (1 << 0)
#define VGA_CRTC_OVERFLOW_VDE8 (1 << 1)
#define VGA_CRTC_OVERFLOW_VRS8 (1 << 2)
#define VGA_CRTC_OVERFLOW_SVB8 (1 << 3)
#define VGA_CRTC_OVERFLOW_LC8 (1 << 4)
#define VGA_CRTC_OVERFLOW_VT9 (1 << 5)
#define VGA_CRTC_OVERFLOW_VDE9 (1 << 6)
#define VGA_CRTC_OVERFLOW_VRS9 (1 << 7)
/* CRTC underline register bits */
#define VGA_CRTC_UNDERLINE_DWORD (1 << 6)
/* CRTC mode control register bits */
#define VGA_CRTC_MODE_CONTROL_WRAP (1 << 5)
#define VGA_CRTC_MODE_CONTROL_BYTE (1 << 6)
#define VGA_CRTC_MODE_CONTROL_SYNC (1 << 7)
/* AC control register bits */
#define VGA_AC_CONTROL_ATGE (1 << 0)
#define VGA_AC_CONTROL_MONO (1 << 1)
#define VGA_AC_CONTROL_LGE (1 << 2)
#define VGA_AC_CONTROL_BLINK (1 << 3)
#define VGA_AC_CONTROL_PPM (1 << 5)
#define VGA_AC_CONTROL_8BIT (1 << 6)
#define VGA_AC_CONTROL_P54S (1 << 7)
/* Miscellaneous register bits */
#define VGA_MISC_COLOR (1 << 0)
#define VGA_MISC_RAM_ENABLED (1 << 1)
#define VGA_MISC_OE_INVERT (1 << 5)
#define VGA_MISC_HSYNCP (1 << 6)
#define VGA_MISC_VSYNCP (1 << 7)
/* Status register flags */
#define VGA_STAT_DD (1 << 0)
#define VGA_STAT_VRETRACE (1 << 3)
enum
{
VGA_SEQ_RESET_REG,
VGA_SEQ_CLOCK_REG,
VGA_SEQ_MASK_REG,
VGA_SEQ_CHAR_REG,
VGA_SEQ_MEM_REG,
VGA_SEQ_MAX_REG
};
enum
{
VGA_GC_RESET_REG,
VGA_GC_ENABLE_RESET_REG,
VGA_GC_COLOR_COMPARE_REG,
VGA_GC_ROTATE_REG,
VGA_GC_READ_MAP_SEL_REG,
VGA_GC_MODE_REG,
VGA_GC_MISC_REG,
VGA_GC_COLOR_IGNORE_REG,
VGA_GC_BITMASK_REG,
VGA_GC_MAX_REG
};
enum
{
VGA_CRTC_HORZ_TOTAL_REG,
VGA_CRTC_END_HORZ_DISP_REG,
VGA_CRTC_START_HORZ_BLANKING_REG,
VGA_CRTC_END_HORZ_BLANKING_REG,
VGA_CRTC_START_HORZ_RETRACE_REG,
VGA_CRTC_END_HORZ_RETRACE_REG,
VGA_CRTC_VERT_TOTAL_REG,
VGA_CRTC_OVERFLOW_REG,
VGA_CRTC_PRESET_ROW_SCAN_REG,
VGA_CRTC_MAX_SCAN_LINE_REG,
VGA_CRTC_CURSOR_START_REG,
VGA_CRTC_CURSOR_END_REG,
VGA_CRTC_START_ADDR_HIGH_REG,
VGA_CRTC_START_ADDR_LOW_REG,
VGA_CRTC_CURSOR_LOC_HIGH_REG,
VGA_CRTC_CURSOR_LOC_LOW_REG,
VGA_CRTC_VERT_RETRACE_START_REG,
VGA_CRTC_VERT_RETRACE_END_REG,
VGA_CRTC_VERT_DISP_END_REG,
VGA_CRTC_OFFSET_REG,
VGA_CRTC_UNDERLINE_REG,
VGA_CRTC_START_VERT_BLANKING_REG,
VGA_CRTC_END_VERT_BLANKING,
VGA_CRTC_MODE_CONTROL_REG,
VGA_CRTC_LINE_COMPARE_REG,
VGA_CRTC_MAX_REG
};
enum
{
VGA_AC_PAL_0_REG,
VGA_AC_PAL_1_REG,
VGA_AC_PAL_2_REG,
VGA_AC_PAL_3_REG,
VGA_AC_PAL_4_REG,
VGA_AC_PAL_5_REG,
VGA_AC_PAL_6_REG,
VGA_AC_PAL_7_REG,
VGA_AC_PAL_8_REG,
VGA_AC_PAL_9_REG,
VGA_AC_PAL_A_REG,
VGA_AC_PAL_B_REG,
VGA_AC_PAL_C_REG,
VGA_AC_PAL_D_REG,
VGA_AC_PAL_E_REG,
VGA_AC_PAL_F_REG,
VGA_AC_CONTROL_REG,
VGA_AC_OVERSCAN_REG,
VGA_AC_COLOR_PLANE_REG,
VGA_AC_HORZ_PANNING_REG,
VGA_AC_COLOR_SEL_REG,
VGA_AC_MAX_REG
};
/* FUNCTIONS ******************************************************************/
DWORD VgaGetVideoBaseAddress(VOID);
DWORD VgaGetVideoLimitAddress(VOID);
COORD VgaGetDisplayResolution(VOID);
VOID VgaRefreshDisplay(VOID);
VOID VgaHorizontalRetrace(VOID);
VOID VgaReadMemory(DWORD Address, LPBYTE Buffer, DWORD Size);
VOID VgaWriteMemory(DWORD Address, LPBYTE Buffer, DWORD Size);
BYTE VgaReadPort(WORD Port);
VOID VgaWritePort(WORD Port, BYTE Data);
VOID VgaInitialize(HANDLE TextHandle);
#endif
/* EOF */