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Fix a bug in AllocateSystemMemory

This commit is contained in:
ergo720 2018-11-29 20:14:32 +01:00
parent d1e2ddd335
commit 8790b48c06
1 changed files with 10 additions and 5 deletions
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13
src/CxbxKrnl/VMManager.cpp
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@ -852,20 +852,25 @@ VAddr VMManager::AllocateSystemMemory(PageType BusyType, DWORD Perms, size_t Siz
PMMPTE EndingPte;
PFN pfn;
PFN EndingPfn;
PFN LowestAcceptablePfn = 0;
PFN HighestAcceptablePfn = XBOX_HIGHEST_PHYSICAL_PAGE;
PFN LowestAcceptablePfn;
PFN HighestAcceptablePfn;
PFN_COUNT PteNumber;
PFN_COUNT PagesNumber;
VAddr addr;
MappingFn MappingRoutine;
bool bVAlloc = false;
MemoryRegionType MemoryType = SystemRegion;
bool bVAlloc;
MemoryRegionType MemoryType;
// NOTE: AllocateSystemMemory won't allocate a physical page for the guard page (if requested) and just adds an extra
// unallocated virtual page in front of the mapped allocation. For this reason we will decommmit later the extra guard page allocated
if (!Size || !ConvertXboxToSystemPteProtection(Perms, &TempPte)) { RETURN(NULL); }
LowestAcceptablePfn = 0;
HighestAcceptablePfn = m_MmLayoutDebug ? XBOX_HIGHEST_PHYSICAL_PAGE : m_HighestPage;
bVAlloc = false;
MemoryType = SystemRegion;
Lock();
PteNumber = ROUND_UP_4K(Size) >> PAGE_SHIFT;