windows-server-2003/drivers/video/ms/vga/mini/vga.h

/*++

Copyright (c) 1992  Microsoft Corporation

Module Name:

    vga.h

Abstract:

    This module contains the definitions for the code that implements the
    VGA device driver.

Author:

Environment:

    Kernel mode

Revision History:


--*/

//
// Base address of VGA memory range.  Also used as base address of VGA
// memory when loading a font, which is done with the VGA mapped at A0000.
//

#define MEM_VGA      0xA0000
#define MEM_VGA_SIZE 0x20000

//
// Index in the access range sturture for video memory
// !!! This must match the VgaAccessRange structure    !!!
// !!! Memory is in the structure, index 2 (3rd entry) !!!

#define VGA_MEMORY  2


//
// VGA port-related definitions.
//
//
// Port definitions for filling the ACCSES_RANGES structure in the miniport
// information, defines the range of I/O ports the VGA spans.
// There is a break in the IO ports - a few ports are used for the parallel
// port. Those cannot be defined in the ACCESS_RANGE, but are still mapped
// so all VGA ports are in one address range.
//

#define VGA_BASE_IO_PORT      0x000003B0
#define VGA_START_BREAK_PORT  0x000003BB
#define VGA_END_BREAK_PORT    0x000003C0
#define VGA_MAX_IO_PORT       0x000003DF

//
// VGA register definitions
//
                                            // ports in monochrome mode
#define CRTC_ADDRESS_PORT_MONO      0x0004  // CRT Controller Address and
#define CRTC_DATA_PORT_MONO         0x0005  // Data registers in mono mode
#define FEAT_CTRL_WRITE_PORT_MONO   0x000A  // Feature Control write port
                                            // in mono mode
#define INPUT_STATUS_1_MONO         0x000A  // Input Status 1 register read
                                            // port in mono mode
#define ATT_INITIALIZE_PORT_MONO    INPUT_STATUS_1_MONO
                                            // Register to read to reset
                                            // Attribute Controller index/data

#define ATT_ADDRESS_PORT            0x0010  // Attribute Controller Address and
#define ATT_DATA_WRITE_PORT         0x0010  // Data registers share one port
                                            // for writes, but only Address is
                                            // readable at 0x3C0
#define ATT_DATA_READ_PORT          0x0011  // Attribute Controller Data reg is
                                            // readable here
#define MISC_OUTPUT_REG_WRITE_PORT  0x0012  // Miscellaneous Output reg write
                                            // port
#define INPUT_STATUS_0_PORT         0x0012  // Input Status 0 register read
                                            // port
#define VIDEO_SUBSYSTEM_ENABLE_PORT 0x0013  // Bit 0 enables/disables the
                                            // entire VGA subsystem
#define SEQ_ADDRESS_PORT            0x0014  // Sequence Controller Address and
#define SEQ_DATA_PORT               0x0015  // Data registers
#define DAC_PIXEL_MASK_PORT         0x0016  // DAC pixel mask reg
#define DAC_ADDRESS_READ_PORT       0x0017  // DAC register read index reg,
                                            // write-only
#define DAC_STATE_PORT              0x0017  // DAC state (read/write),
                                            // read-only
#define DAC_ADDRESS_WRITE_PORT      0x0018  // DAC register write index reg
#define DAC_DATA_REG_PORT           0x0019  // DAC data transfer reg
#define FEAT_CTRL_READ_PORT         0x001A  // Feature Control read port
#define MISC_OUTPUT_REG_READ_PORT   0x001C  // Miscellaneous Output reg read
                                            // port
#define GRAPH_ADDRESS_PORT          0x001E  // Graphics Controller Address
#define GRAPH_DATA_PORT             0x001F  // and Data registers

#define CRTC_ADDRESS_PORT_COLOR     0x0024  // CRT Controller Address and
#define CRTC_DATA_PORT_COLOR        0x0025  // Data registers in color mode
#define FEAT_CTRL_WRITE_PORT_COLOR  0x002A  // Feature Control write port
#define INPUT_STATUS_1_COLOR        0x002A  // Input Status 1 register read
                                            // port in color mode
#define ATT_INITIALIZE_PORT_COLOR   INPUT_STATUS_1_COLOR
                                            // Register to read to reset
                                            // Attribute Controller index/data
                                            // toggle in color mode

//
// Offsets in HardwareStateHeader->PortValue[] of save areas for non-indexed
// VGA registers.
//

#define CRTC_ADDRESS_MONO_OFFSET      0x04
#define FEAT_CTRL_WRITE_MONO_OFFSET   0x0A
#define ATT_ADDRESS_OFFSET            0x10
#define MISC_OUTPUT_REG_WRITE_OFFSET  0x12
#define VIDEO_SUBSYSTEM_ENABLE_OFFSET 0x13
#define SEQ_ADDRESS_OFFSET            0x14
#define DAC_PIXEL_MASK_OFFSET         0x16
#define DAC_STATE_OFFSET              0x17
#define DAC_ADDRESS_WRITE_OFFSET      0x18
#define GRAPH_ADDRESS_OFFSET          0x1E
#define CRTC_ADDRESS_COLOR_OFFSET     0x24
#define FEAT_CTRL_WRITE_COLOR_OFFSET  0x2A

//
// VGA indexed register indexes.
//

#define IND_CURSOR_START        0x0A    // index in CRTC of the Cursor Start
#define IND_CURSOR_END          0x0B    //  and End registers
#define IND_CURSOR_HIGH_LOC     0x0E    // index in CRTC of the Cursor Location
#define IND_CURSOR_LOW_LOC      0x0F    //  High and Low Registers
#define IND_VSYNC_END           0x11    // index in CRTC of the Vertical Sync
                                        //  End register, which has the bit
                                        //  that protects/unprotects CRTC
                                        //  index registers 0-7
#define IND_SET_RESET_ENABLE    0x01    // index of Set/Reset Enable reg in GC
#define IND_DATA_ROTATE         0x03    // index of Data Rotate reg in GC
#define IND_READ_MAP            0x04    // index of Read Map reg in Graph Ctlr
#define IND_GRAPH_MODE          0x05    // index of Mode reg in Graph Ctlr
#define IND_GRAPH_MISC          0x06    // index of Misc reg in Graph Ctlr
#define IND_BIT_MASK            0x08    // index of Bit Mask reg in Graph Ctlr
#define IND_SYNC_RESET          0x00    // index of Sync Reset reg in Seq
#define IND_MAP_MASK            0x02    // index of Map Mask in Sequencer
#define IND_MEMORY_MODE         0x04    // index of Memory Mode reg in Seq
#define IND_CRTC_PROTECT        0x11    // index of reg containing regs 0-7 in
                                        //  CRTC

#define START_SYNC_RESET_VALUE  0x01    // value for Sync Reset reg to start
                                        //  synchronous reset
#define END_SYNC_RESET_VALUE    0x03    // value for Sync Reset reg to end
                                        //  synchronous reset

//
// Values for Attribute Controller Index register to turn video off
// and on, by setting bit 5 to 0 (off) or 1 (on).
//

#define VIDEO_DISABLE 0
#define VIDEO_ENABLE  0x20

//
// Value written to the Read Map register when identifying the existence of
// a VGA in VgaInitialize. This value must be different from the final test
// value written to the Bit Mask in that routine.
//

#define READ_MAP_TEST_SETTING 0x03

//
// Masks to keep only the significant bits of the Graphics Controller and
// Sequencer Address registers. Masking is necessary because some VGAs, such
// as S3-based ones, don't return unused bits set to 0, and some SVGAs use
// these bits if extensions are enabled.
//

#define GRAPH_ADDR_MASK 0x0F
#define SEQ_ADDR_MASK   0x07

//
// Mask used to toggle Chain4 bit in the Sequencer's Memory Mode register.
//

#define CHAIN4_MASK 0x08

//
// Default text mode setting for various registers, used to restore their
// states if VGA detection fails after they've been modified.
//

#define MEMORY_MODE_TEXT_DEFAULT 0x02
#define BIT_MASK_DEFAULT 0xFF
#define READ_MAP_DEFAULT 0x00

//
// Palette-related info.
//

//
// Highest valid DAC color register index.
//

#define VIDEO_MAX_COLOR_REGISTER  0xFF

//
// Highest valid palette register index
//

#define VIDEO_MAX_PALETTE_REGISTER 0x0F

//
// Hardware ID for detected monitor
//

#define VGA_MONITOR_ID 0x12345678

//
// For a mode, the type of banking supported. Controls the information
// returned in VIDEO_BANK_SELECT. PlanarHCBanking includes NormalBanking.
//

typedef enum _BANK_TYPE {
    NoBanking = 0,
    NormalBanking,
    PlanarHCBanking
} BANK_TYPE, *PBANK_TYPE;

//
// Structure used to describe each video mode in ModesVGA[].
//

typedef struct {
    USHORT  fbType; // color or monochrome, text or graphics, via
                    //  VIDEO_MODE_COLOR and VIDEO_MODE_GRAPHICS
    USHORT  numPlanes;    // # of video memory planes
    USHORT  bitsPerPlane; // # of bits of color in each plane
    SHORT   col;    // # of text columns across screen with default font
    SHORT   row;    // # of text rows down screen with default font
    USHORT  hres;   // # of pixels across screen
    USHORT  vres;   // # of scan lines down screen
    USHORT  frequency;    // refresh rate in Hz
    USHORT  wbytes; // # of bytes from start of one scan line to start of next
    ULONG   sbytes; // total size of addressable display memory in bytes
    BANK_TYPE banktype; // NoBanking, NormalBanking, PlanarHCBanking
    ULONG   Int10ModeNumber;
    PUSHORT CmdStrings;     // pointer to array of register-setting commands
    ULONG MemoryBase;       // Base of frame buffer
    ULONG FrameOffset;      // Offset from beginning of frame buffer for this mode
    ULONG FrameLength;      // Size of available frame buffer
    ULONG MemoryLength;     // Total memory
    ULONG PixelsPerScan;    // This is larger than hres if we need to stretch scan
    BOOLEAN NonVgaHardware; // If this mode is compatible with VGA hw register & io ports
    ULONG Granularity;      // The window granularity for banked modes
} VIDEOMODE, *PVIDEOMODE;


//
// Mode into which to put the VGA before starting a VDM, so it's a plain
// vanilla VGA.  (This is the mode's index in ModesVGA[], currently standard
// 80x25 text mode.)
//

#define DEFAULT_MODE 0


//
// Info for the validator functions.
//

//
// Number of each type of indexed register in a standard VGA, used by
// validator and state save/restore functions.
//
// Note: VDMs currently only support basic VGAs only.
//

#define VGA_NUM_SEQUENCER_PORTS     5
#define VGA_NUM_CRTC_PORTS         25
#define VGA_NUM_GRAPH_CONT_PORTS    9
#define VGA_NUM_ATTRIB_CONT_PORTS  21
#define VGA_NUM_DAC_ENTRIES       256

//
// Number of each type of extended indexed register.
//

#define EXT_NUM_SEQUENCER_PORTS     0
#define EXT_NUM_CRTC_PORTS          0
#define EXT_NUM_GRAPH_CONT_PORTS    0
#define EXT_NUM_ATTRIB_CONT_PORTS   0
#define EXT_NUM_DAC_ENTRIES         0

//
// Info used by the Validator functions and save/restore code.
// Structure used to trap register accesses that must be done atomically.
//

#define VGA_MAX_VALIDATOR_DATA             100

#define VGA_VALIDATOR_UCHAR_ACCESS   1
#define VGA_VALIDATOR_USHORT_ACCESS  2
#define VGA_VALIDATOR_ULONG_ACCESS   3

typedef struct _VGA_VALIDATOR_DATA {
   ULONG Port;
   UCHAR AccessType;
   ULONG Data;
} VGA_VALIDATOR_DATA, *PVGA_VALIDATOR_DATA;


//
// Info for the save and restore state functions.
//

//
// Number of bytes to save in each plane.
//

#define VGA_PLANE_SIZE 0x10000

//
// These constants determine the offsets within the
// VIDEO_HARDWARE_STATE_HEADER structure that are used to save and
// restore the VGA's state.
//

#define VGA_HARDWARE_STATE_SIZE sizeof(VIDEO_HARDWARE_STATE_HEADER)

#define VGA_BASIC_SEQUENCER_OFFSET (VGA_HARDWARE_STATE_SIZE + 0)
#define VGA_BASIC_CRTC_OFFSET (VGA_BASIC_SEQUENCER_OFFSET + \
         VGA_NUM_SEQUENCER_PORTS)
#define VGA_BASIC_GRAPH_CONT_OFFSET (VGA_BASIC_CRTC_OFFSET + \
         VGA_NUM_CRTC_PORTS)
#define VGA_BASIC_ATTRIB_CONT_OFFSET (VGA_BASIC_GRAPH_CONT_OFFSET + \
         VGA_NUM_GRAPH_CONT_PORTS)
#define VGA_BASIC_DAC_OFFSET (VGA_BASIC_ATTRIB_CONT_OFFSET + \
         VGA_NUM_ATTRIB_CONT_PORTS)
#define VGA_BASIC_LATCHES_OFFSET (VGA_BASIC_DAC_OFFSET + \
         (3 * VGA_NUM_DAC_ENTRIES))

#define VGA_EXT_SEQUENCER_OFFSET (VGA_BASIC_LATCHES_OFFSET + 4)
#define VGA_EXT_CRTC_OFFSET (VGA_EXT_SEQUENCER_OFFSET + \
         EXT_NUM_SEQUENCER_PORTS)
#define VGA_EXT_GRAPH_CONT_OFFSET (VGA_EXT_CRTC_OFFSET + \
         EXT_NUM_CRTC_PORTS)
#define VGA_EXT_ATTRIB_CONT_OFFSET (VGA_EXT_GRAPH_CONT_OFFSET + \
         EXT_NUM_GRAPH_CONT_PORTS)
#define VGA_EXT_DAC_OFFSET (VGA_EXT_ATTRIB_CONT_OFFSET + \
         EXT_NUM_ATTRIB_CONT_PORTS)

#define VGA_VALIDATOR_OFFSET (VGA_EXT_DAC_OFFSET + 4 * EXT_NUM_DAC_ENTRIES)

#define VGA_VALIDATOR_AREA_SIZE  sizeof (ULONG) + (VGA_MAX_VALIDATOR_DATA * \
                                 sizeof (VGA_VALIDATOR_DATA)) +             \
                                 sizeof (ULONG) +                           \
                                 sizeof (ULONG) +                           \
                                 sizeof (PVIDEO_ACCESS_RANGE)

#define VGA_MISC_DATA_AREA_OFFSET VGA_VALIDATOR_OFFSET + VGA_VALIDATOR_AREA_SIZE

#define VGA_MISC_DATA_AREA_SIZE  0

#define VGA_PLANE_0_OFFSET VGA_MISC_DATA_AREA_OFFSET + VGA_MISC_DATA_AREA_SIZE

#define VGA_PLANE_1_OFFSET VGA_PLANE_0_OFFSET + VGA_PLANE_SIZE
#define VGA_PLANE_2_OFFSET VGA_PLANE_1_OFFSET + VGA_PLANE_SIZE
#define VGA_PLANE_3_OFFSET VGA_PLANE_2_OFFSET + VGA_PLANE_SIZE

//
// Space needed to store all state data.
//

#define VGA_TOTAL_STATE_SIZE VGA_PLANE_3_OFFSET + VGA_PLANE_SIZE

//
// We will always assume 128 byte edid's
//

#define EDID_BUFFER_SIZE 128


//
// Device extension for the driver object.  This data is only used
// locally, so this structure can be added to as needed.
//

typedef struct _HW_DEVICE_EXTENSION {

    PUCHAR IOAddress;              // base I/O address of VGA ports
    PVOID VideoMemoryAddress;      // base virtual memory address of VGA memory
    ULONG   ModeIndex;             // index of current mode in ModesVGA[]
    PVIDEOMODE CurrentMode;        // pointer to VIDEOMODE structure for
                                   // current mode

    USHORT  FontPelColumns;        // Width of the font in pels
    USHORT  FontPelRows;           // height of the font in pels

    VIDEO_CURSOR_POSITION CursorPosition;     // current cursor position

    UCHAR CursorEnable;            // whether cursor is enabled or not
    UCHAR CursorTopScanLine;       // Cursor Start register setting (top scan)
    UCHAR CursorBottomScanLine;    // Cursor End register setting (bottom scan)

    PHYSICAL_ADDRESS PhysicalVideoMemoryBase; // physical memory address and
    ULONG PhysicalVideoMemoryLength;          // length of display memory
    PHYSICAL_ADDRESS PhysicalFrameBaseOffset; // physical memory address and
    ULONG PhysicalFrameLength;                // length of display memory for
                                              // the current mode.

    //
    // These 4 fields must be at the end of the device extension and must be
    // kept in this order since this data will be copied to and from the save
    // state buffer that is passed to and from the VDM.
    //

    ULONG TrappedValidatorCount;   // number of entries in the Trapped
                                   // validator data Array.
    VGA_VALIDATOR_DATA TrappedValidatorData[VGA_MAX_VALIDATOR_DATA];
                                   // Data trapped by the validator routines
                                   // but not yet played back into the VGA
                                   // register.

    ULONG SequencerAddressValue;   // Determines if the Sequencer Address Port
                                   // is currently selecting the SyncReset data
                                   // register.

    ULONG CurrentNumVdmAccessRanges;           // Number of access ranges in
                                               // the access range array pointed
                                               // to by the next field
    PVIDEO_ACCESS_RANGE CurrentVdmAccessRange; // Access range currently
                                               // associated to the VDM

    VIDEO_PORT_INT10_INTERFACE Int10; // Int10 interface

#if defined(PLUG_AND_PLAY)
    ULONG MonitorPowerCapabilities;   // contains vesa power capabilites for
                                      // the monitor
    ULONG MonitorPowerState;          // track the current monitor power
                                      // state
    UCHAR EdidBuffer[EDID_BUFFER_SIZE];        // cache the monitor edid
    BOOLEAN AlwaysUseCachedEdid;            // use cache monitor edid when set
    USHORT VendorID;                  // pci vendor id
    USHORT DeviceID;                  // pci device id

#endif

} HW_DEVICE_EXTENSION, *PHW_DEVICE_EXTENSION;


//
// Function prototypes.
//

VP_STATUS
VgaFindAdapter(
    PVOID HwDeviceExtension,
    PVOID HwContext,
    PWSTR ArgumentString,
    PVIDEO_PORT_CONFIG_INFO ConfigInfo,
    PUCHAR Again
    );

BOOLEAN
VgaInitialize(
    PVOID HwDeviceExtension
    );

BOOLEAN
VgaStartIO(
    PVOID HwDeviceExtension,
    PVIDEO_REQUEST_PACKET RequestPacket
    );

//
// Private function prototypes.
//

VP_STATUS
VgaQueryAvailableModes(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_MODE_INFORMATION ModeInformation,
    ULONG ModeInformationSize,
    PULONG OutputSize
    );

VP_STATUS
VgaQueryNumberOfAvailableModes(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_NUM_MODES NumModes,
    ULONG NumModesSize,
    PULONG OutputSize
    );

VP_STATUS
VgaQueryCurrentMode(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_MODE_INFORMATION ModeInformation,
    ULONG ModeInformationSize,
    PULONG OutputSize
    );

VP_STATUS
VgaSetMode(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_MODE Mode,
    ULONG ModeSize,
    PULONG FrameBufferIsMoved
    );

VP_STATUS
VgaLoadAndSetFont(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_LOAD_FONT_INFORMATION FontInformation,
    ULONG FontInformationSize
    );

VP_STATUS
VgaQueryCursorPosition(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_CURSOR_POSITION CursorPosition,
    ULONG CursorPositionSize,
    PULONG OutputSize
    );

VP_STATUS
VgaSetCursorPosition(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_CURSOR_POSITION CursorPosition,
    ULONG CursorPositionSize
    );

VP_STATUS
VgaQueryCursorAttributes(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_CURSOR_ATTRIBUTES CursorAttributes,
    ULONG CursorAttributesSize,
    PULONG OutputSize
    );

VP_STATUS
VgaSetCursorAttributes(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_CURSOR_ATTRIBUTES CursorAttributes,
    ULONG CursorAttributesSize
    );

BOOLEAN
VgaIsPresent(
    PHW_DEVICE_EXTENSION HwDeviceExtension
    );

VP_STATUS
VgaInterpretCmdStream(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PUSHORT pusCmdStream
    );

VP_STATUS
VgaSetPaletteReg(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_PALETTE_DATA PaletteBuffer,
    ULONG PaletteBufferSize
    );

VP_STATUS
VgaSetColorLookup(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_CLUT ClutBuffer,
    ULONG ClutBufferSize
    );

VP_STATUS
VgaRestoreHardwareState(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_HARDWARE_STATE HardwareState,
    ULONG HardwareStateSize
    );

VP_STATUS
VgaSaveHardwareState(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_HARDWARE_STATE HardwareState,
    ULONG HardwareStateSize,
    PULONG OutputSize
    );

VP_STATUS
VgaGetBankSelectCode(
    PHW_DEVICE_EXTENSION HwDeviceExtension,
    PVIDEO_BANK_SELECT BankSelect,
    ULONG BankSelectSize,
    PULONG OutputSize
    );

VOID
VgaZeroVideoMemory(
    PHW_DEVICE_EXTENSION HwDeviceExtension
    );

//
// Entry points for the VGA validator. Used in VgaEmulatorAccessEntries[].
//

VP_STATUS
VgaValidatorUcharEntry (
    ULONG_PTR Context,
    ULONG Port,
    UCHAR AccessMode,
    PUCHAR Data
    );

VP_STATUS
VgaValidatorUshortEntry (
    ULONG_PTR Context,
    ULONG Port,
    UCHAR AccessMode,
    PUSHORT Data
    );

VP_STATUS
VgaValidatorUlongEntry (
    ULONG_PTR Context,
    ULONG Port,
    UCHAR AccessMode,
    PULONG Data
    );

BOOLEAN
VgaPlaybackValidatorData (
    PVOID Context
    );

VP_STATUS
VgaSetBankPosition(
    PHW_DEVICE_EXTENSION hwDeviceExtension,
    PBANK_POSITION BankPosition
    );

USHORT
RaiseToPower2(
    USHORT x
    );

ULONG
RaiseToPower2Ulong(
    ULONG x
    );

BOOLEAN
IsPower2(
    USHORT x
    );

VP_STATUS
VgaGetPowerState(
    PVOID HwDeviceExtension,
    ULONG HwId,
    PVIDEO_POWER_MANAGEMENT VideoPowerControl
    );

VP_STATUS
VgaSetPowerState (
    PVOID HwDeviceExtension,
    ULONG HwId,
    PVIDEO_POWER_MANAGEMENT VideoPowerControl
    );

ULONG
VgaGetChildDescriptor(
    PVOID HwDeviceExtension,
    PVIDEO_CHILD_ENUM_INFO ChildEnumInfo,
    PVIDEO_CHILD_TYPE pChildType,
    PVOID pChildDescriptor,
    PULONG pUId,
    PULONG pUnused
    );

VOID
VgaGetMonitorEdid(
    PHW_DEVICE_EXTENSION hwDeviceExtension,
    PUCHAR Buffer,
    ULONG Size
    );

VP_STATUS
VgaAcquireResources(
    PHW_DEVICE_EXTENSION HwDeviceExtension
    );

VOID
VgaInitializeSpecialCase(
    PHW_DEVICE_EXTENSION hwDeviceExtension
    );

//
// Global to make sure driver is only loaded once.
//

extern ULONG VgaLoaded;

#if DBG
#define MAX_CONTROL_HISTORY 512
extern ULONG giControlCode;
extern ULONG gaIOControlCode[];
#endif



//
// Bank switch code start and end labels, define in HARDWARE.ASM
//

extern UCHAR BankSwitchStart;
extern UCHAR BankSwitchEnd;

//
// Vga init scripts for font loading
//

extern USHORT EnableA000Data[];
extern USHORT DisableA000Color[];


extern USHORT VGA_640x480[];
extern USHORT VGA_TEXT_0[];
extern USHORT VGA_TEXT_1[];
extern USHORT ModeX240[];
extern USHORT ModeX200[];
extern USHORT ModeXDoubleScans[];

extern VIDEOMODE ModesVGA[];
extern ULONG NumVideoModes;
extern PVIDEOMODE VgaModeList;

#define NUM_VGA_ACCESS_RANGES  5
#define NUM_STD_VGA_ACCESS_RANGES 3
extern VIDEO_ACCESS_RANGE VgaAccessRange[];

#define VGA_NUM_EMULATOR_ACCESS_ENTRIES     8
extern EMULATOR_ACCESS_ENTRY VgaEmulatorAccessEntries[];

#define NUM_MINIMAL_VGA_VALIDATOR_ACCESS_RANGE 5
extern VIDEO_ACCESS_RANGE MinimalVgaValidatorAccessRange[];

#define NUM_FULL_VGA_VALIDATOR_ACCESS_RANGE 3
extern VIDEO_ACCESS_RANGE FullVgaValidatorAccessRange[];