VBoxVideo.h revision cd41ce42a6251fb6086e4688bec5148970eed8d7
/** @file
* VirtualBox Video interface
*/
/*
* Copyright (C) 2006 InnoTek Systemberatung GmbH
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License as published by the Free Software Foundation,
* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
* distribution. VirtualBox OSE is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY of any kind.
*
* If you received this file as part of a commercial VirtualBox
* distribution, then only the terms of your commercial VirtualBox
* license agreement apply instead of the previous paragraph.
*/
#ifndef ___VBox_VBoxVideo_h
#define ___VBox_VBoxVideo_h
#include <iprt/cdefs.h>
#include <iprt/types.h>
/*
* The last 4096 bytes of the guest VRAM contains the generic info for all
* DualView chunks: sizes and offsets of chunks. This is filled by miniport.
*
* Last 4096 bytes of each chunk contain chunk specific data: framebuffer info,
* etc. This is used exclusively by the corresponding instance of a display driver.
*
* The Virtual Graphics Adapter information in the guest VRAM is stored by the
* guest video driver using structures prepended by VBOXVIDEOINFOHDR.
*
* When the guest driver writes dword 0 to the VBE_DISPI_INDEX_CMONITORS,
* the host starts to process the info. The first element at the start of
* the 4096 bytes region should be normally be a LINK that points to
* actual information chain. That way the guest driver can have some
* fixed layout of the information memory block and just rewrite
* the link to point to relevant memory chain.
*
* The processing stops at the END element.
*
* The host can access the memory only when the port IO is processed.
* All data that will be needed later must be copied from these 4096 bytes.
* But other VRAM can be used by host until the mode is disabled.
*
* The guest driver writes dword 0xffffffff to the VBE_DISPI_INDEX_CMONITORS
* to disable the mode.
*
*/
#define VBOX_VIDEO_PRIMARY_SCREEN 0
#define VBOX_VIDEO_NO_SCREEN ~0
/* The size of the information. */
#define VBOX_VIDEO_ADAPTER_INFORMATION_SIZE 4096
#define VBOX_VIDEO_DISPLAY_INFORMATION_SIZE 4096
/* The value for port IO to let the adapter to interpret the adapter memory. */
#define VBOX_VIDEO_DISABLE_ADAPTER_MEMORY 0xFFFFFFFF
/* The value for port IO to let the adapter to interpret the adapter memory. */
#define VBOX_VIDEO_INTERPRET_ADAPTER_MEMORY 0x00000000
/* The value for port IO to let the adapter to interpret the display memory.
* The display number is encoded in low 16 bits.
*/
#define VBOX_VIDEO_INTERPRET_DISPLAY_MEMORY_BASE 0x00010000
/* The end of the information. */
#define VBOX_VIDEO_INFO_TYPE_END 0
/* Instructs the host to fetch the next VBOXVIDEOINFOHDR at the given offset of VRAM. */
#define VBOX_VIDEO_INFO_TYPE_LINK 1
/* Information about a display memory position. */
#define VBOX_VIDEO_INFO_TYPE_DISPLAY 2
/* Information about a screen. */
#define VBOX_VIDEO_INFO_TYPE_SCREEN 3
/* Information about host notifications for the driver. */
#define VBOX_VIDEO_INFO_TYPE_HOST_EVENTS 4
#pragma pack(1)
typedef struct _VBOXVIDEOINFOHDR
{
uint8_t u8Type;
uint8_t u8Reserved;
uint16_t u16Length;
} VBOXVIDEOINFOHDR;
typedef struct _VBOXVIDEOINFOLINK
{
/* Relative offset in VRAM */
int32_t i32Offset;
} VBOXVIDEOINFOLINK;
/* Resides in adapter info memory. Describes a display VRAM chunk. */
typedef struct _VBOXVIDEOINFODISPLAY
{
/* Index of the framebuffer assigned by guest. */
uint32_t u32Index;
/* Absolute offset in VRAM of the framebuffer to be displayed on the monitor. */
uint32_t u32Offset;
/* The size of the memory that can be used for the screen. */
uint32_t u32FramebufferSize;
/* The size of the memory that is used for the Display information.
* The information is at u32Offset + u32FramebufferSize
*/
uint32_t u32InformationSize;
} VBOXVIDEOINFODISPLAY;
/* Resides in display info area, describes the current video mode. */
#define VBOX_VIDEO_INFO_SCREEN_F_NONE 0x00
#define VBOX_VIDEO_INFO_SCREEN_F_ACTIVE 0x01
typedef struct _VBOXVIDEOINFOSCREEN
{
/* Physical X origin relative to the primary screen. */
int32_t xOrigin;
/* Physical Y origin relative to the primary screen. */
int32_t yOrigin;
/* The scan line size in bytes. */
uint32_t u32LineSize;
/* Width of the screen. */
uint16_t u16Width;
/* Height of the screen. */
uint16_t u16Height;
/* Color depth. */
uint8_t bitsPerPixel;
/* VBOX_VIDEO_INFO_SCREEN_F_* */
uint8_t u8Flags;
} VBOXVIDEOINFOSCREEN;
/* The guest initializes the structure to 0. The positions of the structure in the
* display info area must not be changed, host will update the structure. Guest checks
* the events and modifies the structure as a response to host.
*/
#define VBOX_VIDEO_INFO_HOST_EVENTS_F_NONE 0x00000000
#define VBOX_VIDEO_INFO_HOST_EVENTS_F_VRDP_RESET 0x00000080
typedef struct _VBOXVIDEOINFOHOSTEVENTS
{
/* Host events. */
uint32_t fu32Events;
} VBOXVIDEOINFOHOSTEVENTS;
#pragma pack()
#endif