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/* $Revision: 87431 $ */
/** @file
* VBoxGuestLibR0 - Generic VMMDev request management.
*/
/*
* Copyright (C) 2006-2013 Oracle Corporation
*
* 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 (GPL) 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.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
#include "VBGLInternal.h"
#include <iprt/asm.h>
#include <iprt/asm-amd64-x86.h>
#include <iprt/assert.h>
#include <iprt/string.h>
DECLVBGL(int) VbglGRVerify (const VMMDevRequestHeader *pReq, size_t cbReq)
{
size_t cbReqExpected;
if (!pReq || cbReq < sizeof (VMMDevRequestHeader))
{
dprintf(("VbglGRVerify: Invalid parameter: pReq = %p, cbReq = %d\n", pReq, cbReq));
return VERR_INVALID_PARAMETER;
}
if (pReq->size > cbReq)
{
dprintf(("VbglGRVerify: request size %d > buffer size %d\n", pReq->size, cbReq));
return VERR_INVALID_PARAMETER;
}
/* The request size must correspond to the request type. */
cbReqExpected = vmmdevGetRequestSize(pReq->requestType);
if (cbReq < cbReqExpected)
{
dprintf(("VbglGRVerify: buffer size %d < expected size %d\n", cbReq, cbReqExpected));
return VERR_INVALID_PARAMETER;
}
if (cbReqExpected == cbReq)
{
/* This is most likely a fixed size request, and in this case the request size
* must be also equal to the expected size.
*/
if (pReq->size != cbReqExpected)
{
dprintf(("VbglGRVerify: request size %d != expected size %d\n", pReq->size, cbReqExpected));
return VERR_INVALID_PARAMETER;
}
return VINF_SUCCESS;
}
/*
* This can be a variable size request. Check the request type and limit the size
* to VMMDEV_MAX_VMMDEVREQ_SIZE, which is max size supported by the host.
*
* Note: Keep this list sorted for easier human lookup!
*/
if ( pReq->requestType == VMMDevReq_ChangeMemBalloon
#ifdef VBOX_WITH_64_BITS_GUESTS
|| pReq->requestType == VMMDevReq_HGCMCall32
|| pReq->requestType == VMMDevReq_HGCMCall64
#else
|| pReq->requestType == VMMDevReq_HGCMCall
#endif /* VBOX_WITH_64_BITS_GUESTS */
|| pReq->requestType == VMMDevReq_RegisterSharedModule
|| pReq->requestType == VMMDevReq_ReportGuestUserState
|| pReq->requestType == VMMDevReq_LogString
|| pReq->requestType == VMMDevReq_SetPointerShape
|| pReq->requestType == VMMDevReq_VideoSetVisibleRegion)
{
if (cbReq > VMMDEV_MAX_VMMDEVREQ_SIZE)
{
dprintf(("VbglGRVerify: VMMDevReq_LogString: buffer size %d too big\n", cbReq));
return VERR_BUFFER_OVERFLOW; /* @todo is this error code ok? */
}
}
else
{
dprintf(("VbglGRVerify: request size %d > buffer size %d\n", pReq->size, cbReq));
return VERR_IO_BAD_LENGTH; /* @todo is this error code ok? */
}
return VINF_SUCCESS;
}
DECLVBGL(int) VbglGRAlloc (VMMDevRequestHeader **ppReq, uint32_t cbSize, VMMDevRequestType reqType)
{
VMMDevRequestHeader *pReq;
int rc = vbglR0Enter ();
if (RT_FAILURE(rc))
return rc;
if (!ppReq || cbSize < sizeof (VMMDevRequestHeader))
{
dprintf(("VbglGRAlloc: Invalid parameter: ppReq = %p, cbSize = %u\n", ppReq, cbSize));
return VERR_INVALID_PARAMETER;
}
pReq = (VMMDevRequestHeader *)VbglPhysHeapAlloc (cbSize);
if (!pReq)
{
AssertMsgFailed(("VbglGRAlloc: no memory\n"));
rc = VERR_NO_MEMORY;
}
else
{
memset(pReq, 0xAA, cbSize);
pReq->size = cbSize;
pReq->version = VMMDEV_REQUEST_HEADER_VERSION;
pReq->requestType = reqType;
pReq->rc = VERR_GENERAL_FAILURE;
pReq->reserved1 = 0;
pReq->reserved2 = 0;
*ppReq = pReq;
}
return rc;
}
DECLVBGL(int) VbglGRPerform (VMMDevRequestHeader *pReq)
{
RTCCPHYS physaddr;
int rc = vbglR0Enter ();
if (RT_FAILURE(rc))
return rc;
if (!pReq)
return VERR_INVALID_PARAMETER;
physaddr = VbglPhysHeapGetPhysAddr (pReq);
if ( !physaddr
|| (physaddr >> 32) != 0) /* Port IO is 32 bit. */
{
rc = VERR_VBGL_INVALID_ADDR;
}
else
{
ASMOutU32(g_vbgldata.portVMMDev + VMMDEV_PORT_OFF_REQUEST, (uint32_t)physaddr);
/* Make the compiler aware that the host has changed memory. */
ASMCompilerBarrier();
rc = pReq->rc;
}
return rc;
}
DECLVBGL(void) VbglGRFree (VMMDevRequestHeader *pReq)
{
int rc = vbglR0Enter ();
if (RT_FAILURE(rc))
return;
VbglPhysHeapFree (pReq);
}
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