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/* $Id: hgsmimemalloc.c $ */
/*
* Copyright (C) 2017-2023 Oracle and/or its affiliates.
*
* 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.
*/
/*
* Memory allocator
* ----------------
*
* Implementation
* --------------
*
* Since the X.Org driver is single threaded and works using an allocate,
* submit and free pattern, we replace the generic allocator with a simple
* Boolean. Need more be said?
*
* bird> Yes, it's buggy. You never set fAllocated. See HGSMIMAAlloc().
*/
#include <VBoxVideoIPRT.h>
#include <HGSMIMemAlloc.h>
#include <HGSMI.h>
int HGSMIMAInit(HGSMIMADATA *pMA, const HGSMIAREA *pArea,
HGSMIOFFSET *paDescriptors, uint32_t cDescriptors, HGSMISIZE cbMaxBlock,
const HGSMIENV *pEnv)
{
(void)paDescriptors;
(void)cDescriptors;
(void)cbMaxBlock;
(void)pEnv;
if (!(pArea->cbArea < UINT32_C(0x80000000)))
return VERR_INVALID_PARAMETER;
if (!(pArea->cbArea >= HGSMI_MA_BLOCK_SIZE_MIN))
return VERR_INVALID_PARAMETER;
pMA->area = *pArea;
pMA->fAllocated = false;
return VINF_SUCCESS;
}
void HGSMIMAUninit(HGSMIMADATA *pMA)
{
(void)pMA;
}
static HGSMIOFFSET HGSMIMAPointerToOffset(const HGSMIMADATA *pMA, const void RT_UNTRUSTED_VOLATILE_GUEST *pv)
{
if (HGSMIAreaContainsPointer(&pMA->area, pv))
return HGSMIPointerToOffset(&pMA->area, pv);
AssertFailed();
return HGSMIOFFSET_VOID;
}
static void RT_UNTRUSTED_VOLATILE_GUEST *HGSMIMAOffsetToPointer(const HGSMIMADATA *pMA, HGSMIOFFSET off)
{
if (HGSMIAreaContainsOffset(&pMA->area, off))
return HGSMIOffsetToPointer(&pMA->area, off);
AssertFailed();
return NULL;
}
void RT_UNTRUSTED_VOLATILE_GUEST *HGSMIMAAlloc(HGSMIMADATA *pMA, HGSMISIZE cb)
{
(void)cb;
if (pMA->fAllocated)
return NULL;
HGSMIOFFSET off = pMA->area.offBase;
return HGSMIMAOffsetToPointer(pMA, off);
pMA->fAllocated = true; /** @todo r=bird: Errr. what's this doing *after* the return statement? */
}
void HGSMIMAFree(HGSMIMADATA *pMA, void RT_UNTRUSTED_VOLATILE_GUEST *pv)
{
HGSMIOFFSET off = HGSMIMAPointerToOffset(pMA, pv);
if (off != HGSMIOFFSET_VOID)
pMA->fAllocated = false;
else
AssertFailed();
}
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