SVGA_REG_ENABLE_DISABLE := 0
SVGA_REG_ENABLE_ENABLE := 1
SVGA_REG_ENABLE_HIDE := 2
SVGA_REG_ENABLE_ENABLE_HIDE := SVGA_REG_ENABLE_ENABLE | SVGA_REG_ENABLE_HIDE
SVGA_REG_ENABLE := 1
SVGA_REG_WIDTH := 2
SVGA_REG_HEIGHT := 3   
SVGA_REG_BITS_PER_PIXEL := 7    
SVGA_REG_BYTES_PER_LINE := 12