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/* SPDX-License-Identifier: MIT */
/* Copyright (C) 2006-2016 Oracle Corporation */
#ifndef __VBOXVIDEO_H__
#define __VBOXVIDEO_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 VRAM layout:
* Last 4096 bytes - Adapter information area.
* 4096 bytes aligned miniport heap (value specified in the config rouded up).
* Slack - what left after dividing the VRAM.
* 4096 bytes aligned framebuffers:
* last 4096 bytes of each framebuffer is the display information area.
* 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_VBOX_VIDEO
* 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_VBOX_VIDEO
* to disable the mode.
* VBE_DISPI_INDEX_VBOX_VIDEO is used to read the configuration information
* from the host and issue commands to the host.
* The guest writes the VBE_DISPI_INDEX_VBOX_VIDEO index register, the the
* following operations with the VBE data register can be performed:
* Operation Result
* write 16 bit value NOP
* read 16 bit value count of monitors
* write 32 bit value set the vbox cmd value and the cmd processed by the host
* read 32 bit value result of the last vbox command is returned
struct vbva_cmd_hdr {
s16 x;
s16 y;
u16 w;
u16 h;
} __packed;
* The VBVA ring buffer is suitable for transferring large (< 2GB) amount of
* data. For example big bitmaps which do not fit to the buffer.
* Guest starts writing to the buffer by initializing a record entry in the
* records queue. VBVA_F_RECORD_PARTIAL indicates that the record is being
* written. As data is written to the ring buffer, the guest increases
* free_offset.
* The host reads the records on flushes and processes all completed records.
* When host encounters situation when only a partial record presents and
* VBVA_RING_BUFFER_THRESHOLD, the host fetched all record data and updates
* data_offset. After that on each flush the host continues fetching the data
* until the record is completed.
#define VBVA_RING_BUFFER_SIZE (4194304 - 1024)
#define VBVA_MAX_RECORDS (64)
#define VBVA_F_MODE_ENABLED 0x00000001u
#define VBVA_F_MODE_VRDP 0x00000002u
#define VBVA_F_MODE_VRDP_RESET 0x00000004u
#define VBVA_F_MODE_VRDP_ORDER_MASK 0x00000008u
#define VBVA_F_STATE_PROCESSING 0x00010000u
#define VBVA_F_RECORD_PARTIAL 0x80000000u
struct vbva_record {
u32 len_and_flags;
} __packed;
* The minimum HGSMI heap size is PAGE_SIZE (4096 bytes) and is a restriction of
* the runtime heapsimple API. Use minimum 2 pages here, because the info area
* also may contain other data (for example hgsmi_host_flags structure).
#define VBVA_MIN_BUFFER_SIZE 65536
/* The value for port IO to let the adapter to interpret the adapter memory. */
/* The value for port IO to let the adapter to interpret the adapter memory. */
* The value for port IO to let the adapter to interpret the display memory.
* The display number is encoded in low 16 bits.
struct vbva_host_flags {
u32 host_events;
u32 supported_orders;
} __packed;
struct vbva_buffer {
struct vbva_host_flags host_flags;
/* The offset where the data start in the buffer. */
u32 data_offset;
/* The offset where next data must be placed in the buffer. */
u32 free_offset;
/* The queue of record descriptions. */
struct vbva_record records[VBVA_MAX_RECORDS];
u32 record_first_index;
u32 record_free_index;
/* Space to leave free when large partial records are transferred. */
u32 partial_write_tresh;
u32 data_len;
/* variable size for the rest of the vbva_buffer area in VRAM. */
u8 data[];
} __packed;
#define VBVA_MAX_RECORD_SIZE (128 * 1024 * 1024)
/* guest->host commands */
#define VBVA_QUERY_CONF32 1
#define VBVA_SET_CONF32 2
#define VBVA_INFO_VIEW 3
#define VBVA_INFO_HEAP 4
#define VBVA_FLUSH 5
#define VBVA_ENABLE 7
/* informs host about HGSMI caps. see vbva_caps below */
#define VBVA_INFO_CAPS 12
/* configures scanline, see VBVASCANLINECFG below */
/* requests scanline info, see VBVASCANLINEINFO below */
/* inform host about VBVA Command submission */
/* inform host about VBVA Command submission */
/* G->H DMA command */
/* Query most recent mode hints sent */
* Report the guest virtual desktop position and size for mapping host and
* guest pointer positions.
/* Report the guest cursor position and query the host position. */
/* host->guest commands */
#define VBVAHG_EVENT 1
/* vbva_conf32::index */
* Returns VINF_SUCCESS if the host can report mode hints via VBVA.
* Set value to VERR_NOT_SUPPORTED before calling.
* Returns VINF_SUCCESS if the host can report guest cursor enabled status via
* VBVA. Set value to VERR_NOT_SUPPORTED before calling.
* Returns the currently available host cursor capabilities. Available if
/* Returns the supported flags in vbva_infoscreen.flags. */
/* Returns the max size of VBVA record. */
struct vbva_conf32 {
u32 index;
u32 value;
} __packed;
/* Reserved for historical reasons. */
* Guest cursor capability: can the host show a hardware cursor at the host
* pointer location?
/* Reserved for historical reasons. */
/* Reserved for historical reasons. Must always be unset. */
/* Reserved for historical reasons. */
/* Reserved for historical reasons. */
struct vbva_infoview {
/* Index of the screen, assigned by the guest. */
u32 view_index;
/* The screen offset in VRAM, the framebuffer starts here. */
u32 view_offset;
/* The size of the VRAM memory that can be used for the view. */
u32 view_size;
/* The recommended maximum size of the VRAM memory for the screen. */
u32 max_screen_size;
} __packed;
struct vbva_flush {
u32 reserved;
} __packed;
/* vbva_infoscreen.flags */
#define VBVA_SCREEN_F_NONE 0x0000
#define VBVA_SCREEN_F_ACTIVE 0x0001
* The virtual monitor has been disabled by the guest and should be removed
* by the host and ignored for purposes of pointer position calculation.
* The virtual monitor has been blanked by the guest and should be blacked
* out by the host using width, height, etc values from the vbva_infoscreen
* request.
#define VBVA_SCREEN_F_BLANK 0x0004
* The virtual monitor has been blanked by the guest and should be blacked
* out by the host using the previous mode values for width. height, etc.
#define VBVA_SCREEN_F_BLANK2 0x0008
struct vbva_infoscreen {
/* Which view contains the screen. */
u32 view_index;
/* Physical X origin relative to the primary screen. */
s32 origin_x;
/* Physical Y origin relative to the primary screen. */
s32 origin_y;
/* Offset of visible framebuffer relative to the framebuffer start. */
u32 start_offset;
/* The scan line size in bytes. */
u32 line_size;
/* Width of the screen. */
u32 width;
/* Height of the screen. */
u32 height;
/* Color depth. */
u16 bits_per_pixel;
u16 flags;
} __packed;
/* vbva_enable.flags */
#define VBVA_F_NONE 0x00000000
#define VBVA_F_ENABLE 0x00000001
#define VBVA_F_DISABLE 0x00000002
/* extended VBVA to be used with WDDM */
#define VBVA_F_EXTENDED 0x00000004
/* vbva offset is absolute VRAM offset */
#define VBVA_F_ABSOFFSET 0x00000008
struct vbva_enable {
u32 flags;
u32 offset;
s32 result;
} __packed;
struct vbva_enable_ex {
struct vbva_enable base;
u32 screen_id;
} __packed;
struct vbva_mouse_pointer_shape {
/* The host result. */
s32 result;
/* VBOX_MOUSE_POINTER_* bit flags. */
u32 flags;
/* X coordinate of the hot spot. */
u32 hot_X;
/* Y coordinate of the hot spot. */
u32 hot_y;
/* Width of the pointer in pixels. */
u32 width;
/* Height of the pointer in scanlines. */
u32 height;
/* Pointer data.
* The data consists of 1 bpp AND mask followed by 32 bpp XOR (color)
* mask.
* For pointers without alpha channel the XOR mask pixels are 32 bit
* values: (lsb)BGR0(msb). For pointers with alpha channel the XOR mask
* consists of (lsb)BGRA(msb) 32 bit values.
* Guest driver must create the AND mask for pointers with alpha chan.,
* so if host does not support alpha, the pointer could be displayed as
* a normal color pointer. The AND mask can be constructed from alpha
* values. For example alpha value >= 0xf0 means bit 0 in the AND mask.
* The AND mask is 1 bpp bitmap with byte aligned scanlines. Size of AND
* mask, therefore, is and_len = (width + 7) / 8 * height. The padding
* bits at the end of any scanline are undefined.
* The XOR mask follows the AND mask on the next 4 bytes aligned offset:
* u8 *xor = and + (and_len + 3) & ~3
* Bytes in the gap between the AND and the XOR mask are undefined.
* XOR mask scanlines have no gap between them and size of XOR mask is:
* xor_len = width * 4 * height.
* Preallocate 4 bytes for accessing actual data as p->data.
u8 data[4];
} __packed;
/* pointer is visible */
/* pointer has alpha channel */
/* pointerData contains new pointer shape */
* The guest driver can handle asynch guest cmd completion by reading the
* command offset from io port.
/* the guest driver can handle video adapter IRQs */
#define VBVACAPS_IRQ 0x00000002
/* The guest can read video mode hints sent via VBVA. */
#define VBVACAPS_VIDEO_MODE_HINTS 0x00000004
/* The guest can switch to a software cursor on demand. */
/* The guest does not depend on host handling the VBE registers. */
#define VBVACAPS_USE_VBVA_ONLY 0x00000010
struct vbva_caps {
s32 rc;
u32 caps;
} __packed;
/* Query the most recent mode hints received from the host. */
struct vbva_query_mode_hints {
/* The maximum number of screens to return hints for. */
u16 hints_queried_count;
/* The size of the mode hint structures directly following this one. */
u16 hint_structure_guest_size;
/* Return code for the operation. Initialise to VERR_NOT_SUPPORTED. */
s32 rc;
} __packed;
* Structure in which a mode hint is returned. The guest allocates an array
* of these immediately after the vbva_query_mode_hints structure.
* To accommodate future extensions, the vbva_query_mode_hints structure
* specifies the size of the vbva_modehint structures allocated by the guest,
* and the host only fills out structure elements which fit into that size. The
* host should fill any unused members (e.g. dx, dy) or structure space on the
* end with ~0. The whole structure can legally be set to ~0 to skip a screen.
struct vbva_modehint {
u32 magic;
u32 cx;
u32 cy;
u32 bpp; /* Which has never been used... */
u32 display;
u32 dx; /* X offset into the virtual frame-buffer. */
u32 dy; /* Y offset into the virtual frame-buffer. */
u32 enabled; /* Not flags. Add new members for new flags. */
} __packed;
#define VBVAMODEHINT_MAGIC 0x0801add9u
* Report the rectangle relative to which absolute pointer events should be
* expressed. This information remains valid until the next VBVA resize event
* for any screen, at which time it is reset to the bounding rectangle of all
* virtual screens and must be re-set.
struct vbva_report_input_mapping {
s32 x; /* Upper left X co-ordinate relative to the first screen. */
s32 y; /* Upper left Y co-ordinate relative to the first screen. */
u32 cx; /* Rectangle width. */
u32 cy; /* Rectangle height. */
} __packed;
* Report the guest cursor position and query the host one. The host may wish
* to use the guest information to re-position its own cursor (though this is
* currently unlikely).
struct vbva_cursor_position {
u32 report_position; /* Are we reporting a position? */
u32 x; /* Guest cursor X position */
u32 y; /* Guest cursor Y position */
} __packed;