/**
* Convert a page in the page pool to a HC physical address.
* This works for pages allocated by MMR3PageAlloc(), MMR3PageAllocPhys()
* and MMR3PageAllocLow().
*
* @returns Physical address for the specified page table.
* @param pVM The cross context VM structure.
* @param pvPage Page which physical address we query.
* @thread The Emulation Thread.
*/
VMMDECL(RTHCPHYS) MMPage2Phys(PVM pVM, void *pvPage)
{
RTHCPHYS HCPhys = mmPagePoolPtr2Phys(pVM->mm.s.CTX_SUFF(pPagePool), pvPage);
if (HCPhys == NIL_RTHCPHYS)
{
HCPhys = mmPagePoolPtr2Phys(pVM->mm.s.CTX_SUFF(pPagePoolLow), pvPage);
if (HCPhys == NIL_RTHCPHYS)
{
STAM_COUNTER_INC(&pVM->mm.s.CTX_SUFF(pPagePool)->cErrors);
AssertMsgFailed(("Invalid pvPage=%p specified\n", pvPage));
}
}
return HCPhys;
}
/**
* Allocates a page from the page pool and return its physical address.
*
* This function may returns pages which has physical addresses any
* where. If you require a page to be within the first 4GB of physical
* memory, use MMR3PageAllocLow().
*
* @returns Pointer to the allocated page page.
* @returns NIL_RTHCPHYS on failure.
* @param pVM The cross context VM structure.
* @thread The Emulation Thread.
*/
VMMR3DECL(RTHCPHYS) MMR3PageAllocPhys(PVM pVM)
{
/* Note: unprotected by locks; currently fine as it's used during init or under the PGM lock */
/** @todo optimize this, it's the most common case now. */
void *pv = mmR3PagePoolAlloc(pVM->mm.s.pPagePoolR3);
if (pv)
return mmPagePoolPtr2Phys(pVM->mm.s.pPagePoolR3, pv);
return NIL_RTHCPHYS;
}
/**
* Gets the HC pointer to the dummy page.
*
* The dummy page is used as a place holder to prevent potential bugs
* from doing really bad things to the system.
*
* @returns Pointer to the dummy page.
* @param pVM The cross context VM structure.
* @thread The Emulation Thread.
*/
VMMR3DECL(void *) MMR3PageDummyHCPtr(PVM pVM)
{
VM_ASSERT_EMT(pVM);
if (!pVM->mm.s.pvDummyPage)
{
pVM->mm.s.pvDummyPage = mmR3PagePoolAlloc(pVM->mm.s.pPagePoolR3);
AssertRelease(pVM->mm.s.pvDummyPage);
pVM->mm.s.HCPhysDummyPage = mmPagePoolPtr2Phys(pVM->mm.s.pPagePoolR3, pVM->mm.s.pvDummyPage);
AssertRelease(!(pVM->mm.s.HCPhysDummyPage & ~X86_PTE_PAE_PG_MASK));
}
return pVM->mm.s.pvDummyPage;
}