/**
* Converts a pool address to a physical address.
* The specified allocation type must match with the address.
*
* @returns Physical address.
* @returns NIL_RTHCPHYS if not found or eType is not matching.
* @param pPool Pointer to the page pool.
* @param pv The address to convert.
* @thread The Emulation Thread.
*/
RTHCPHYS mmPagePoolPtr2Phys(PMMPAGEPOOL pPool, void *pv)
{
#ifdef IN_RING3
VM_ASSERT_EMT(pPool->pVM);
#endif
/*
* Lookup the virtual address.
*/
PMMPPLOOKUPHCPTR pLookup = (PMMPPLOOKUPHCPTR)RTAvlPVGetBestFit(&pPool->pLookupVirt, pv, false);
if (pLookup)
{
unsigned iPage = ((char *)pv - (char *)pLookup->pSubPool->pvPages) >> PAGE_SHIFT;
if (iPage < pLookup->pSubPool->cPages)
{
/*
* Convert the virtual address to a physical address.
*/
STAM_COUNTER_INC(&pPool->cToPhysCalls);
AssertMsg( pLookup->pSubPool->paPhysPages[iPage].Phys
&& !(pLookup->pSubPool->paPhysPages[iPage].Phys & PAGE_OFFSET_MASK),
("Phys=%#x\n", pLookup->pSubPool->paPhysPages[iPage].Phys));
AssertMsg((uintptr_t)pLookup->pSubPool == pLookup->pSubPool->paPhysPages[iPage].uReserved,
("pSubPool=%p uReserved=%p\n", pLookup->pSubPool, pLookup->pSubPool->paPhysPages[iPage].uReserved));
return pLookup->pSubPool->paPhysPages[iPage].Phys + ((uintptr_t)pv & PAGE_OFFSET_MASK);
}
}
return NIL_RTHCPHYS;
}
/**
* Frees a page from the page pool.
*
* @param pPool Pointer to the page pool.
* @param pv Pointer to the page to free.
* I.e. pointer returned by mmR3PagePoolAlloc().
* @thread The Emulation Thread.
*/
DECLINLINE(void) mmR3PagePoolFree(PMMPAGEPOOL pPool, void *pv)
{
VM_ASSERT_EMT(pPool->pVM);
STAM_COUNTER_INC(&pPool->cFreeCalls);
/*
* Lookup the virtual address.
*/
PMMPPLOOKUPHCPTR pLookup = (PMMPPLOOKUPHCPTR)RTAvlPVGetBestFit(&pPool->pLookupVirt, pv, false);
if ( !pLookup
|| (uint8_t *)pv >= (uint8_t *)pLookup->pSubPool->pvPages + (pLookup->pSubPool->cPages << PAGE_SHIFT)
)
{
STAM_COUNTER_INC(&pPool->cErrors);
AssertMsgFailed(("invalid pointer %p\n", pv));
return;
}
/*
* Free the page.
*/
PMMPAGESUBPOOL pSubPool = pLookup->pSubPool;
/* clear bitmap bit */
const unsigned iPage = ((uint8_t *)pv - (uint8_t *)pSubPool->pvPages) >> PAGE_SHIFT;
#ifdef USE_INLINE_ASM_BIT_OPS
Assert(ASMBitTest(pSubPool->auBitmap, iPage));
ASMBitClear(pSubPool->auBitmap, iPage);
#else
unsigned iBit = iPage % (sizeof(pSubPool->auBitmap[0]) * 8);
unsigned iIndex = iPage / (sizeof(pSubPool->auBitmap[0]) * 8);
pSubPool->auBitmap[iIndex] &= ~(1 << iBit);
#endif
/* update stats. */
pSubPool->cPagesFree++;
#ifdef VBOX_WITH_STATISTICS
pPool->cFreePages++;
#endif
if (pSubPool->cPagesFree == 1)
{
pSubPool->pNextFree = pPool->pHeadFree;
pPool->pHeadFree = pSubPool;
}
}