mirror of
https://github.com/Fennix-Project/Kernel.git
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122 lines
3.1 KiB
C++
122 lines
3.1 KiB
C++
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef __FENNIX_KERNEL_MEMORY_VMA_H__
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#define __FENNIX_KERNEL_MEMORY_VMA_H__
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#include <types.h>
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#include <filesystem.hpp>
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#include <bitmap.hpp>
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#include <lock.hpp>
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#include <list>
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#include <memory/table.hpp>
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namespace Memory
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{
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class VirtualMemoryArea
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{
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public:
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struct AllocatedPages
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{
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void *Address;
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size_t PageCount;
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bool Protected;
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};
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struct SharedRegion
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{
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void *Address = nullptr;
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bool Read = 0, Write = 0, Exec = 0;
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bool Fixed = 0, Shared = 0;
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size_t Length = 0;
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size_t ReferenceCount = 0;
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};
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private:
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NewLock(MgrLock);
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Bitmap PageBitmap;
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std::list<AllocatedPages> AllocatedPagesList;
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std::list<SharedRegion> SharedRegions;
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public:
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PageTable *Table = nullptr;
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uint64_t GetAllocatedMemorySize();
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void *RequestPages(size_t Count, bool User = false, bool Protect = false);
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void FreePages(void *Address, size_t Count);
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void DetachAddress(void *Address);
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/**
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* Create a Copy-on-Write region
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*
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* @param Address Hint address
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* @param Length Length of the region
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* @param Read Make the region readable
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* @param Write Make the region writable
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* @param Exec Make the region executable
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* @param Fixed Fixed address
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* @param Shared Shared region
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* @return Address of the region
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*/
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void *CreateCoWRegion(void *Address, size_t Length,
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bool Read, bool Write, bool Exec,
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bool Fixed, bool Shared);
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bool HandleCoW(uintptr_t PFA);
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void FreeAllPages();
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void Fork(VirtualMemoryArea *Parent);
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void Reserve(void *Address, size_t Length);
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void Unreserve(void *Address, size_t Length);
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int Map(void *VirtualAddress, void *PhysicalAddress,
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size_t Length, uint64_t Flags);
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int Remap(void *VirtualAddress, void *PhysicalAddress, uint64_t Flags);
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int Unmap(void *VirtualAddress, size_t Length);
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void *__UserCheckAndGetAddress(void *Address, size_t Length);
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int __UserCheck(void *Address, size_t Length);
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template <typename T>
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T UserCheckAndGetAddress(T Address, size_t Length = 0)
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{
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if (Length == 0)
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Length = sizeof(T);
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void *PhysAddr = __UserCheckAndGetAddress((void *)Address, Length);
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if (PhysAddr == nullptr)
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return {};
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return T(PhysAddr);
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}
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template <typename T>
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int UserCheck(T Address, size_t Length = 0)
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{
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if (Length == 0)
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Length = sizeof(T);
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return __UserCheck((void *)Address, Length);
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}
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VirtualMemoryArea(PageTable *Table);
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~VirtualMemoryArea();
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};
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}
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#endif // !__FENNIX_KERNEL_MEMORY_VMA_H__
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