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/* $Id: HGSMIDefs.h $ */
/** @file
* VBox Host Guest Shared Memory Interface (HGSMI) - shared part - types and defines.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef VBOX_INCLUDED_Graphics_HGSMIDefs_h
#define VBOX_INCLUDED_Graphics_HGSMIDefs_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include "VBoxVideoIPRT.h"
/* HGSMI uses 32 bit offsets and sizes. */
typedef uint32_t HGSMISIZE;
typedef uint32_t HGSMIOFFSET;
#define HGSMIOFFSET_VOID ((HGSMIOFFSET)~0)
/**
* Describes a shared memory area buffer.
*
* Used for calculations with offsets and for buffers verification.
*/
typedef struct HGSMIAREA
{
uint8_t *pu8Base; /**< The starting address of the area. Corresponds to offset 'offBase'. */
HGSMIOFFSET offBase; /**< The starting offset of the area. */
HGSMIOFFSET offLast; /**< The last valid offset: offBase + cbArea - 1 - (sizeof(header) + sizeof(tail)). */
HGSMISIZE cbArea; /**< Size of the area. */
} HGSMIAREA;
/* The buffer description flags. */
#define HGSMI_BUFFER_HEADER_F_SEQ_MASK 0x03 /* Buffer sequence type mask. */
#define HGSMI_BUFFER_HEADER_F_SEQ_SINGLE 0x00 /* Single buffer, not a part of a sequence. */
#define HGSMI_BUFFER_HEADER_F_SEQ_START 0x01 /* The first buffer in a sequence. */
#define HGSMI_BUFFER_HEADER_F_SEQ_CONTINUE 0x02 /* A middle buffer in a sequence. */
#define HGSMI_BUFFER_HEADER_F_SEQ_END 0x03 /* The last buffer in a sequence. */
#pragma pack(1) /** @todo not necessary. use AssertCompileSize instead. */
/* 16 bytes buffer header. */
typedef struct HGSMIBUFFERHEADER
{
uint32_t u32DataSize; /* Size of data that follows the header. */
uint8_t u8Flags; /* The buffer description: HGSMI_BUFFER_HEADER_F_* */
uint8_t u8Channel; /* The channel the data must be routed to. */
uint16_t u16ChannelInfo; /* Opaque to the HGSMI, used by the channel. */
union {
uint8_t au8Union[8]; /* Opaque placeholder to make the union 8 bytes. */
struct
{ /* HGSMI_BUFFER_HEADER_F_SEQ_SINGLE */
uint32_t u32Reserved1; /* A reserved field, initialize to 0. */
uint32_t u32Reserved2; /* A reserved field, initialize to 0. */
} Buffer;
struct
{ /* HGSMI_BUFFER_HEADER_F_SEQ_START */
uint32_t u32SequenceNumber; /* The sequence number, the same for all buffers in the sequence. */
uint32_t u32SequenceSize; /* The total size of the sequence. */
} SequenceStart;
struct
{ /* HGSMI_BUFFER_HEADER_F_SEQ_CONTINUE and HGSMI_BUFFER_HEADER_F_SEQ_END */
uint32_t u32SequenceNumber; /* The sequence number, the same for all buffers in the sequence. */
uint32_t u32SequenceOffset; /* Data offset in the entire sequence. */
} SequenceContinue;
} u;
} HGSMIBUFFERHEADER;
/* 8 bytes buffer tail. */
typedef struct HGSMIBUFFERTAIL
{
uint32_t u32Reserved; /* Reserved, must be initialized to 0. */
uint32_t u32Checksum; /* Verifyer for the buffer header and offset and for first 4 bytes of the tail. */
} HGSMIBUFFERTAIL;
#pragma pack()
AssertCompileSize(HGSMIBUFFERHEADER, 16);
AssertCompileSize(HGSMIBUFFERTAIL, 8);
/* The size of the array of channels. Array indexes are uint8_t. Note: the value must not be changed. */
#define HGSMI_NUMBER_OF_CHANNELS 0x100
typedef struct HGSMIENV
{
/* Environment context pointer. */
void *pvEnv;
/* Allocate system memory. */
DECLCALLBACKMEMBER(void *, pfnAlloc)(void *pvEnv, HGSMISIZE cb);
/* Free system memory. */
DECLCALLBACKMEMBER(void, pfnFree)(void *pvEnv, void *pv);
} HGSMIENV;
#endif /* !VBOX_INCLUDED_Graphics_HGSMIDefs_h */
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