vga_io_rcrt
par->vga_state.HorizontalTotal = vga_io_rcrt(0x00); /* HorizontalTotal */
par->vga_state.HorizDisplayEnd = vga_io_rcrt(0x01); /* HorizDisplayEnd */
par->vga_state.StartHorizRetrace = vga_io_rcrt(0x04); /* StartHorizRetrace */
par->vga_state.EndHorizRetrace = vga_io_rcrt(0x05); /* EndHorizRetrace */
par->vga_state.Overflow = vga_io_rcrt(0x07); /* Overflow */
par->vga_state.StartVertRetrace = vga_io_rcrt(0x10); /* StartVertRetrace */
par->vga_state.EndVertRetrace = vga_io_rcrt(0x11); /* EndVertRetrace */
par->vga_state.ModeControl = vga_io_rcrt(0x17); /* ModeControl */