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Updated memory mapping functions

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This commit is contained in:
Alex
2022-11-05 04:40:15 +02:00
parent 6ae0e9db26
commit 52ef1e3b3b
4 changed files with 91 additions and 73 deletions
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42
Core/Memory/PageDirectoryEntry.cpp Normal file
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@ -0,0 +1,42 @@
#include <memory.hpp>
namespace Memory
{
void PageDirectoryEntry::AddFlag(uint64_t Flag) { this->Value.raw |= Flag; }
void PageDirectoryEntry::RemoveFlags(uint64_t Flag) { this->Value.raw &= ~Flag; }
void PageDirectoryEntry::ClearFlags() { this->Value.raw = 0; }
void PageDirectoryEntry::SetFlag(uint64_t Flag, bool Enabled)
{
this->Value.raw &= ~Flag;
if (Enabled)
this->Value.raw |= Flag;
}
bool PageDirectoryEntry::GetFlag(uint64_t Flag) { return (this->Value.raw & Flag) > 0 ? true : false; }
uint64_t PageDirectoryEntry::GetFlag() { return this->Value.raw; }
void PageDirectoryEntry::SetAddress(uint64_t Address)
{
#if defined(__amd64__)
Address &= 0x000000FFFFFFFFFF;
this->Value.raw &= 0xFFF0000000000FFF;
this->Value.raw |= (Address << 12);
#elif defined(__i386__)
Address &= 0x000FFFFF;
this->Value.raw &= 0xFFC00003;
this->Value.raw |= (Address << 12);
#elif defined(__aarch64__)
Address &= 0x000000FFFFFFFFFF;
this->Value.raw &= 0xFFF0000000000FFF;
this->Value.raw |= (Address << 12);
#endif
}
uint64_t PageDirectoryEntry::GetAddress()
{
#if defined(__amd64__)
return (this->Value.raw & 0x000FFFFFFFFFF000) >> 12;
#elif defined(__i386__)
return (this->Value.raw & 0x003FFFFF000) >> 12;
#elif defined(__aarch64__)
return (this->Value.raw & 0x000FFFFFFFFFF000) >> 12;
#endif
}
}

22
Core/Memory/PageMapIndexer.cpp Normal file
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@ -0,0 +1,22 @@
#include <memory.hpp>
namespace Memory
{
Virtual::PageMapIndexer::PageMapIndexer(uint64_t VirtualAddress)
{
#if defined(__amd64__)
this->PDPIndex = (VirtualAddress & ((uint64_t)0x1FF << 39)) >> 39;
this->PDIndex = (VirtualAddress & ((uint64_t)0x1FF << 30)) >> 30;
this->PTIndex = (VirtualAddress & ((uint64_t)0x1FF << 21)) >> 21;
this->PIndex = (VirtualAddress & ((uint64_t)0x1FF << 12)) >> 12;
#elif defined(__i386__)
this->PDIndex = (VirtualAddress & ((uint64_t)0x3FF << 22)) >> 22;
this->PTIndex = (VirtualAddress & ((uint64_t)0x3FF << 12)) >> 12;
this->PIndex = (VirtualAddress & ((uint64_t)0xFFF)) >> 0;
#elif defined(__aarch64__)
this->PDIndex = (VirtualAddress & ((uint64_t)0x1FF << 30)) >> 30;
this->PTIndex = (VirtualAddress & ((uint64_t)0x1FF << 21)) >> 21;
this->PIndex = (VirtualAddress & ((uint64_t)0x1FF << 12)) >> 12;
#endif
}
}

28
Core/Memory/VirtualMemoryManager.cpp
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@ -12,8 +12,8 @@ namespace Memory
Address &= 0xFFFFFFFFFFFFF000;
PageMapIndexer Index = PageMapIndexer((uint64_t)Address);
PageDirectoryEntry PDE = this->Table->Entries[Index.PDP_i];
return PDE.GetFlag(Flag) ? true : false;
PageDirectoryEntry PDE = this->Table->Entries[Index.PDPIndex];
return PDE.GetFlag(Flag);
}
void Virtual::Map(void *VirtualAddress, void *PhysicalAddress, uint64_t Flags)
@ -25,8 +25,8 @@ namespace Memory
return;
}
PageMapIndexer Index = PageMapIndexer((uint64_t)VirtualAddress);
PageDirectoryEntry PDE = this->Table->Entries[Index.PDP_i];
PageTable *PDP;
PageDirectoryEntry PDE = this->Table->Entries[Index.PDPIndex];
PageTable *PDP = nullptr;
if (!PDE.GetFlag(PTFlag::P))
{
PDP = (PageTable *)KernelAllocator.RequestPage();
@ -34,13 +34,13 @@ namespace Memory
PDE.SetAddress((uint64_t)PDP >> 12);
PDE.SetFlag(PTFlag::P, true);
PDE.AddFlag(Flags);
this->Table->Entries[Index.PDP_i] = PDE;
this->Table->Entries[Index.PDPIndex] = PDE;
}
else
PDP = (PageTable *)((uint64_t)PDE.GetAddress() << 12);
PDE = PDP->Entries[Index.PD_i];
PageTable *PD;
PDE = PDP->Entries[Index.PDIndex];
PageTable *PD = nullptr;
if (!PDE.GetFlag(PTFlag::P))
{
PD = (PageTable *)KernelAllocator.RequestPage();
@ -48,13 +48,13 @@ namespace Memory
PDE.SetAddress((uint64_t)PD >> 12);
PDE.SetFlag(PTFlag::P, true);
PDE.AddFlag(Flags);
PDP->Entries[Index.PD_i] = PDE;
PDP->Entries[Index.PDIndex] = PDE;
}
else
PD = (PageTable *)((uint64_t)PDE.GetAddress() << 12);
PDE = PD->Entries[Index.PT_i];
PageTable *PT;
PDE = PD->Entries[Index.PTIndex];
PageTable *PT = nullptr;
if (!PDE.GetFlag(PTFlag::P))
{
PT = (PageTable *)KernelAllocator.RequestPage();
@ -62,16 +62,16 @@ namespace Memory
PDE.SetAddress((uint64_t)PT >> 12);
PDE.SetFlag(PTFlag::P, true);
PDE.AddFlag(Flags);
PD->Entries[Index.PT_i] = PDE;
PD->Entries[Index.PTIndex] = PDE;
}
else
PT = (PageTable *)((uint64_t)PDE.GetAddress() << 12);
PDE = PT->Entries[Index.P_i];
PDE = PT->Entries[Index.PIndex];
PDE.SetAddress((uint64_t)PhysicalAddress >> 12);
PDE.SetFlag(PTFlag::P, true);
PDE.AddFlag(Flags);
PT->Entries[Index.P_i] = PDE;
PT->Entries[Index.PIndex] = PDE;
#if defined(__amd64__)
CPU::x64::invlpg(VirtualAddress);
#elif defined(__i386__)
@ -120,7 +120,7 @@ namespace Memory
}
PageMapIndexer Index = PageMapIndexer((uint64_t)VirtualAddress);
PageDirectoryEntry PDE = this->Table->Entries[Index.PDP_i];
PageDirectoryEntry PDE = this->Table->Entries[Index.PDPIndex];
PDE.ClearFlags();
#if defined(__amd64__) || defined(__i386__)