enderice2/Fennix
enderice2/Fennix
1
0
Fork 0
mirror of https://github.com/EnderIce2/Fennix.git synced 2025-05-28 15:34:31 +00:00
Code Issues Actions Releases Wiki Activity

Add flags to all page directories (as Intel 317080-003 doc says)

Browse Source
This commit is contained in:
Alex 2022-12-06 01:27:00 +02:00
parent 4188a465d2
commit 3454c9692f
Signed by untrusted user who does not match committer: enderice2
GPG Key ID: EACC3AD603BAB4DD
1 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
Core/Memory/VirtualMemoryManager.cpp
View File

@ -50,20 +50,22 @@ namespace Memory
}
PageMapIndexer Index = PageMapIndexer((uint64_t)VirtualAddress);
// Clear any flags that are not 1 << 0 (Present) - 1 << 5 (Accessed) because rest are for page table entries only
uint64_t DirectoryFlags = Flags & 0x3F;
PageMapLevel4 PML4 = this->Table->Entries[Index.PMLIndex];
PageDirectoryPointerTableEntryPtr *PDPTEPtr = nullptr;
if (!PML4.Present)
{
PDPTEPtr = (PageDirectoryPointerTableEntryPtr *)KernelAllocator.RequestPage();
memset(PDPTEPtr, 0, PAGE_SIZE);
PML4.Present = true;
PML4.raw |= Flags;
PML4.SetAddress((uint64_t)PDPTEPtr >> 12);
this->Table->Entries[Index.PMLIndex] = PML4;
}
else
PDPTEPtr = (PageDirectoryPointerTableEntryPtr *)((uint64_t)PML4.GetAddress() << 12);
PML4.raw |= DirectoryFlags;
this->Table->Entries[Index.PMLIndex] = PML4;
PageDirectoryPointerTableEntry PDPTE = PDPTEPtr->Entries[Index.PDPTEIndex];
PageDirectoryEntryPtr *PDEPtr = nullptr;
@ -72,12 +74,12 @@ namespace Memory
PDEPtr = (PageDirectoryEntryPtr *)KernelAllocator.RequestPage();
memset(PDEPtr, 0, PAGE_SIZE);
PDPTE.Present = true;
PDPTE.raw |= Flags;
PDPTE.SetAddress((uint64_t)PDEPtr >> 12);
PDPTEPtr->Entries[Index.PDPTEIndex] = PDPTE;
}
else
PDEPtr = (PageDirectoryEntryPtr *)((uint64_t)PDPTE.GetAddress() << 12);
PDPTE.raw |= DirectoryFlags;
PDPTEPtr->Entries[Index.PDPTEIndex] = PDPTE;
PageDirectoryEntry PDE = PDEPtr->Entries[Index.PDEIndex];
PageTableEntryPtr *PTEPtr = nullptr;
@ -86,12 +88,12 @@ namespace Memory
PTEPtr = (PageTableEntryPtr *)KernelAllocator.RequestPage();
memset(PTEPtr, 0, PAGE_SIZE);
PDE.Present = true;
PDE.raw |= Flags;
PDE.SetAddress((uint64_t)PTEPtr >> 12);
PDEPtr->Entries[Index.PDEIndex] = PDE;
}
else
PTEPtr = (PageTableEntryPtr *)((uint64_t)PDE.GetAddress() << 12);
PDE.raw |= DirectoryFlags;
PDEPtr->Entries[Index.PDEIndex] = PDE;
PageTableEntry PTE = PTEPtr->Entries[Index.PTEIndex];
PTE.Present = true;