reactos/ntoskrnl/mm/ARM3/zeropage.c

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/*
* PROJECT: ReactOS Kernel
* LICENSE: BSD - See COPYING.ARM in the top level directory
* FILE: ntoskrnl/mm/ARM3/zeropage.c
* PURPOSE: ARM Memory Manager Zero Page Thread Support
* PROGRAMMERS: ReactOS Portable Systems Group
*/
/* INCLUDES *******************************************************************/
#include <ntoskrnl.h>
#define NDEBUG
#include <debug.h>
#define MODULE_INVOLVED_IN_ARM3
#include <mm/ARM3/miarm.h>
/* GLOBALS ********************************************************************/
KEVENT MmZeroingPageEvent;
/* PRIVATE FUNCTIONS **********************************************************/
VOID
NTAPI
MiFindInitializationCode(OUT PVOID *StartVa,
OUT PVOID *EndVa);
VOID
NTAPI
MiFreeInitializationCode(IN PVOID StartVa,
IN PVOID EndVa);
VOID
NTAPI
MmZeroPageThread(VOID)
{
PKTHREAD Thread = KeGetCurrentThread();
PVOID StartAddress, EndAddress;
PVOID WaitObjects[2];
KIRQL OldIrql;
PVOID ZeroAddress;
PFN_NUMBER PageIndex, FreePage;
PMMPFN Pfn1;
/* Get the discardable sections to free them */
MiFindInitializationCode(&StartAddress, &EndAddress);
if (StartAddress) MiFreeInitializationCode(StartAddress, EndAddress);
DPRINT("Free pages: %lx\n", MmAvailablePages);
/* Set our priority to 0 */
Thread->BasePriority = 0;
KeSetPriorityThread(Thread, 0);
/* Setup the wait objects */
WaitObjects[0] = &MmZeroingPageEvent;
// WaitObjects[1] = &PoSystemIdleTimer; FIXME: Implement idle timer
while (TRUE)
{
KeWaitForMultipleObjects(1, // 2
WaitObjects,
WaitAny,
WrFreePage,
KernelMode,
FALSE,
NULL,
NULL);
OldIrql = MiAcquirePfnLock();
while (TRUE)
{
if (!MmFreePageListHead.Total)
{
KeClearEvent(&MmZeroingPageEvent);
MiReleasePfnLock(OldIrql);
break;
}
PageIndex = MmFreePageListHead.Flink;
ASSERT(PageIndex != LIST_HEAD);
Pfn1 = MiGetPfnEntry(PageIndex);
MI_SET_USAGE(MI_USAGE_ZERO_LOOP);
MI_SET_PROCESS2("Kernel 0 Loop");
FreePage = MiRemoveAnyPage(MI_GET_PAGE_COLOR(PageIndex));
/* The first global free page should also be the first on its own list */
if (FreePage != PageIndex)
{
KeBugCheckEx(PFN_LIST_CORRUPT,
0x8F,
FreePage,
PageIndex,
0);
}
Pfn1->u1.Flink = LIST_HEAD;
MiReleasePfnLock(OldIrql);
ZeroAddress = MiMapPagesInZeroSpace(Pfn1, 1);
ASSERT(ZeroAddress);
RtlZeroMemory(ZeroAddress, PAGE_SIZE);
MiUnmapPagesInZeroSpace(ZeroAddress, 1);
OldIrql = MiAcquirePfnLock();
MiInsertPageInList(&MmZeroedPageListHead, PageIndex);
}
}
}
/* EOF */