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