HGSMIOFFSET HGSMIHeapBufferOffset (HGSMIHEAP *pHeap,
void *pvData)
{
HGSMIBUFFERHEADER *pHeader = HGSMIBufferHeaderFromData (pvData);
HGSMIOFFSET offBuffer = HGSMIPointerToOffset (&pHeap->area, pHeader);
return offBuffer;
}
/**
* Inform the host that a command has been handled.
*
* @param pCtx the context containing the heap to be used
* @param pvMem pointer into the heap as mapped in @a pCtx to the command to
* be completed
*/
RTDECL(void) VBoxHGSMIHostCmdComplete(PHGSMIHOSTCOMMANDCONTEXT pCtx,
void *pvMem)
{
HGSMIBUFFERHEADER *pHdr = HGSMIBufferHeaderFromData(pvMem);
HGSMIOFFSET offMem = HGSMIPointerToOffset(&pCtx->areaCtx, pHdr);
Assert(offMem != HGSMIOFFSET_VOID);
if(offMem != HGSMIOFFSET_VOID)
{
HGSMINotifyHostCmdComplete(pCtx, offMem);
}
}
/* Initialize the memory buffer including its checksum.
* No changes alloed to the header and the tail after that.
*/
HGSMIOFFSET HGSMIBufferInitializeSingle(const HGSMIAREA *pArea,
HGSMIBUFFERHEADER *pHeader,
HGSMISIZE cbBuffer,
uint8_t u8Channel,
uint16_t u16ChannelInfo)
{
if ( !pArea
|| !pHeader
|| cbBuffer < HGSMIBufferMinimumSize())
{
return HGSMIOFFSET_VOID;
}
/* Buffer must be within the area:
* * header data size do not exceed the maximum data size;
* * buffer address is greater than the area base address;
* * buffer address is lower than the maximum allowed for the given data size.
*/
HGSMISIZE cbMaximumDataSize = pArea->offLast - pArea->offBase;
uint32_t u32DataSize = cbBuffer - HGSMIBufferMinimumSize();
if ( u32DataSize > cbMaximumDataSize
|| (uint8_t *)pHeader < pArea->pu8Base
|| (uint8_t *)pHeader > pArea->pu8Base + cbMaximumDataSize - u32DataSize)
{
return HGSMIOFFSET_VOID;
}
HGSMIOFFSET offBuffer = HGSMIPointerToOffset(pArea, pHeader);
pHeader->u8Flags = HGSMI_BUFFER_HEADER_F_SEQ_SINGLE;
pHeader->u32DataSize = u32DataSize;
pHeader->u8Channel = u8Channel;
pHeader->u16ChannelInfo = u16ChannelInfo;
RT_ZERO(pHeader->u.au8Union);
HGSMIBUFFERTAIL *pTail = HGSMIBufferTailFromPtr(pHeader, u32DataSize);
pTail->u32Reserved = 0;
pTail->u32Checksum = HGSMIChecksum(offBuffer, pHeader, pTail);
return offBuffer;
}
static VBOXVIDEOOFFSET vboxMpCrShgsmiBufferOffset(PVBOXMP_DEVEXT pDevExt, void *pvBuffer)
{
return (VBOXVIDEOOFFSET)HGSMIPointerToOffset(&VBoxCommonFromDeviceExt(pDevExt)->guestCtx.heapCtx.Heap.area, (const HGSMIBUFFERHEADER *)pvBuffer);
}
static VBOXVIDEOOFFSET vboxMpCrShgsmiBufferOffset(PVBOXMP_DEVEXT pDevExt, void RT_UNTRUSTED_VOLATILE_HOST *pvBuffer)
{
return (VBOXVIDEOOFFSET)HGSMIPointerToOffset(&VBoxCommonFromDeviceExt(pDevExt)->guestCtx.heapCtx.Heap.area, pvBuffer);
}
