reactos/drivers/base/kdvm/kdvbox.c

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/*
* COPYRIGHT: GPL, see COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/base/kdvm/kdvbox.c
* PURPOSE: VBOX data exchange function for kdvbox
* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
*/
#include "kdvm.h"
typedef struct
{
ULONG SendSize;
ULONG BufferSize;
} KDVBOX_SEND_HEADER, *PKDVBOX_SEND_HEADER;
typedef struct
{
ULONG ReceivedDataSize;
} KDVBOX_RECEIVE_HEADER, *PKDVBOX_RECEIVE_HEADER;
VOID
NTAPI
KdVmPrepareBuffer(VOID)
{
KdVmBufferPos = sizeof(KDVBOX_SEND_HEADER);
}
VOID
NTAPI
KdVmKdVmExchangeData(
_Out_ PVOID* ReceiveData,
_Out_ PULONG ReceiveDataSize)
{
PKDVBOX_SEND_HEADER SendHeader;
PKDVBOX_RECEIVE_HEADER ReceiveHeader;
/* Setup the send-header */
SendHeader = (PKDVBOX_SEND_HEADER)KdVmDataBuffer;
SendHeader->SendSize = KdVmBufferPos - sizeof(KDVBOX_SEND_HEADER);
SendHeader->BufferSize = KDVM_BUFFER_SIZE;
//KdpDbgPrint("Sending buffer:\n");
//KdVmDbgDumpBuffer(KdVmDataBuffer, KdVmBufferPos);
/* Do the data exchange */
KdVmExchange((ULONG_PTR)KdVmBufferPhysicalAddress.QuadPart, 0);
/* Reset the buffer position */
KdVmBufferPos = sizeof(KDVBOX_SEND_HEADER);
/* Get the receive-header and return information about the received data */
ReceiveHeader = (PKDVBOX_RECEIVE_HEADER)KdVmDataBuffer;
*ReceiveData = KdVmDataBuffer + sizeof(KDVBOX_RECEIVE_HEADER);
*ReceiveDataSize = ReceiveHeader->ReceivedDataSize;
//KdpDbgPrint("got data:\n");
//KdVmDbgDumpBuffer(KdVmDataBuffer, *ReceiveDataSize + sizeof(*ReceiveHeader));
}