reactos/drivers/base/bootvid/i386/pc/pc.h

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#pragma once
extern ULONG_PTR VgaRegisterBase;
extern ULONG_PTR VgaBase;
extern USHORT AT_Initialization[];
extern USHORT VGA_640x480[];
extern UCHAR PixelMask[8];
#define __inpb(Port) \
READ_PORT_UCHAR((PUCHAR)(VgaRegisterBase + (Port)))
#define __inpw(Port) \
READ_PORT_USHORT((PUSHORT)(VgaRegisterBase + (Port)))
#define __outpb(Port, Value) \
WRITE_PORT_UCHAR((PUCHAR)(VgaRegisterBase + (Port)), (UCHAR)(Value))
#define __outpw(Port, Value) \
WRITE_PORT_USHORT((PUSHORT)(VgaRegisterBase + (Port)), (USHORT)(Value))
FORCEINLINE
VOID
SetPixel(
_In_ ULONG Left,
_In_ ULONG Top,
_In_ UCHAR Color)
{
PUCHAR PixelPosition;
/* Calculate the pixel position */
PixelPosition = (PUCHAR)(VgaBase + (Left >> 3) + (Top * (SCREEN_WIDTH / 8)));
/* Select the bitmask register and write the mask */
__outpw(VGA_BASE_IO_PORT + GRAPH_ADDRESS_PORT, (PixelMask[Left & 7] << 8) | IND_BIT_MASK);
/* Read the current pixel value and add our color */
WRITE_REGISTER_UCHAR(PixelPosition, READ_REGISTER_UCHAR(PixelPosition) & Color);
}