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Restructured and rewritten entire codebase
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Alex
301
arch/amd64/bootstrap/multiboot/Paging/mb_64bit_map.cpp
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301
arch/amd64/bootstrap/multiboot/Paging/mb_64bit_map.cpp
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/*
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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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#include <types.h>
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union __attribute__((packed)) PageTableEntry
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{
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struct
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{
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bool Present : 1; // 0
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bool ReadWrite : 1; // 1
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bool UserSupervisor : 1; // 2
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bool WriteThrough : 1; // 3
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bool CacheDisable : 1; // 4
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bool Accessed : 1; // 5
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bool Dirty : 1; // 6
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bool PageAttributeTable : 1; // 7
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bool Global : 1; // 8
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uint8_t Available0 : 3; // 9-11
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uint64_t Address : 40; // 12-51
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uint32_t Available1 : 7; // 52-58
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uint8_t ProtectionKey : 4; // 59-62
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bool ExecuteDisable : 1; // 63
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};
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uint64_t raw;
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__always_inline inline SafeFunction NIF void SetAddress(uintptr_t _Address)
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{
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_Address &= 0x000000FFFFFFFFFF;
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this->raw &= 0xFFF0000000000FFF;
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this->raw |= (_Address << 12);
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}
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__always_inline inline SafeFunction NIF uintptr_t GetAddress() { return (this->raw & 0x000FFFFFFFFFF000) >> 12; }
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};
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struct __attribute__((packed)) PageTableEntryPtr
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{
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PageTableEntry Entries[512];
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};
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union __attribute__((packed)) PageDirectoryEntry
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{
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struct
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{
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bool Present : 1; // 0
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bool ReadWrite : 1; // 1
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bool UserSupervisor : 1; // 2
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bool WriteThrough : 1; // 3
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bool CacheDisable : 1; // 4
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bool Accessed : 1; // 5
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bool Available0 : 1; // 6
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bool PageSize : 1; // 7
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uint8_t Available1 : 4; // 8-11
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uint64_t Address : 40; // 12-51
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uint32_t Available2 : 11; // 52-62
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bool ExecuteDisable : 1; // 63
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};
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uint64_t raw;
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__always_inline inline SafeFunction NIF void SetAddress(uintptr_t _Address)
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{
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_Address &= 0x000000FFFFFFFFFF;
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this->raw &= 0xFFF0000000000FFF;
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this->raw |= (_Address << 12);
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}
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__always_inline inline SafeFunction NIF uintptr_t GetAddress() { return (this->raw & 0x000FFFFFFFFFF000) >> 12; }
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};
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struct __attribute__((packed)) PageDirectoryEntryPtr
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{
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PageDirectoryEntry Entries[512];
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};
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union __attribute__((packed)) PageDirectoryPointerTableEntry
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{
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struct
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{
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bool Present : 1; // 0
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bool ReadWrite : 1; // 1
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bool UserSupervisor : 1; // 2
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bool WriteThrough : 1; // 3
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bool CacheDisable : 1; // 4
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bool Accessed : 1; // 5
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bool Available0 : 1; // 6
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bool PageSize : 1; // 7
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uint8_t Available1 : 4; // 8-11
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uint64_t Address : 40; // 12-51
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uint32_t Available2 : 11; // 52-62
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bool ExecuteDisable : 1; // 63
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};
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uint64_t raw;
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__always_inline inline SafeFunction NIF void SetAddress(uintptr_t _Address)
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{
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_Address &= 0x000000FFFFFFFFFF;
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this->raw &= 0xFFF0000000000FFF;
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this->raw |= (_Address << 12);
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}
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__always_inline inline SafeFunction NIF uintptr_t GetAddress() { return (this->raw & 0x000FFFFFFFFFF000) >> 12; }
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};
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struct __attribute__((packed)) PageDirectoryPointerTableEntryPtr
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{
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PageDirectoryPointerTableEntry Entries[512];
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};
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union __attribute__((packed)) PageMapLevel4
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{
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struct
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{
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bool Present : 1; // 0
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bool ReadWrite : 1; // 1
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bool UserSupervisor : 1; // 2
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bool WriteThrough : 1; // 3
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bool CacheDisable : 1; // 4
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bool Accessed : 1; // 5
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bool Available0 : 1; // 6
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bool Reserved0 : 1; // 7
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uint8_t Available1 : 4; // 8-11
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uint64_t Address : 40; // 12-51
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uint32_t Available2 : 11; // 52-62
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bool ExecuteDisable : 1; // 63
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};
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uint64_t raw;
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__always_inline inline SafeFunction NIF void SetAddress(uintptr_t _Address)
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{
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_Address &= 0x000000FFFFFFFFFF;
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this->raw &= 0xFFF0000000000FFF;
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this->raw |= (_Address << 12);
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}
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__always_inline inline SafeFunction NIF uintptr_t GetAddress() { return (this->raw & 0x000FFFFFFFFFF000) >> 12; }
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};
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struct PageTable4
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{
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PageMapLevel4 Entries[512];
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} __attribute__((aligned(0x1000)));
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extern "C" char BootPageTable[];
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extern uintptr_t _kernel_start, _kernel_end;
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__attribute__((section(".bootstrap.data"))) static PageTable4 *BPTable = (PageTable4 *)BootPageTable;
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__attribute__((section(".bootstrap.data"))) static size_t BPT_Allocated = 0x4000;
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__always_inline inline SafeFunction NIF void *RequestPage()
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{
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void *Page = (void *)(BootPageTable + BPT_Allocated);
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BPT_Allocated += 0x1000;
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if (BPT_Allocated >= 0x10000) /* The length of BootPageTable */
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{
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while (true)
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;
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}
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return Page;
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}
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class PageMapIndexer
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{
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public:
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uintptr_t PMLIndex = 0;
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uintptr_t PDPTEIndex = 0;
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uintptr_t PDEIndex = 0;
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uintptr_t PTEIndex = 0;
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__always_inline inline SafeFunction NIF PageMapIndexer(uintptr_t VirtualAddress)
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{
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uintptr_t Address = VirtualAddress;
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Address >>= 12;
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this->PTEIndex = Address & 0x1FF;
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Address >>= 9;
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this->PDEIndex = Address & 0x1FF;
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Address >>= 9;
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this->PDPTEIndex = Address & 0x1FF;
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Address >>= 9;
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this->PMLIndex = Address & 0x1FF;
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}
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};
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__attribute__((section(".bootstrap.text"))) SafeFunction NIF void MB2_64_Map(void *VirtualAddress, void *PhysicalAddress, uint64_t Flags)
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{
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PageMapIndexer Index = PageMapIndexer((uintptr_t)VirtualAddress);
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// Clear any flags that are not 1 << 0 (Present) - 1 << 5 (Accessed) because rest are for page table entries only
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uint64_t DirectoryFlags = Flags & 0x3F;
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PageMapLevel4 PML4 = BPTable->Entries[Index.PMLIndex];
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PageDirectoryPointerTableEntryPtr *PDPTEPtr = nullptr;
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if (!PML4.Present)
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{
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PDPTEPtr = (PageDirectoryPointerTableEntryPtr *)RequestPage();
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if (PDPTEPtr == nullptr)
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return;
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{
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void *ptr = PDPTEPtr;
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uint8_t value = 0;
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size_t num = 0x1000;
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uint8_t *p = (uint8_t *)ptr;
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for (size_t i = 0; i < num; i++)
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p[i] = value;
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}
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PML4.Present = true;
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PML4.SetAddress((uintptr_t)PDPTEPtr >> 12);
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}
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else
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PDPTEPtr = (PageDirectoryPointerTableEntryPtr *)((uintptr_t)PML4.GetAddress() << 12);
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PML4.raw |= DirectoryFlags;
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BPTable->Entries[Index.PMLIndex] = PML4;
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PageDirectoryPointerTableEntry PDPTE = PDPTEPtr->Entries[Index.PDPTEIndex];
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PageDirectoryEntryPtr *PDEPtr = nullptr;
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if (!PDPTE.Present)
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{
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PDEPtr = (PageDirectoryEntryPtr *)RequestPage();
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if (PDEPtr == nullptr)
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return;
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{
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void *ptr = PDEPtr;
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uint8_t value = 0;
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size_t num = 0x1000;
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uint8_t *p = (uint8_t *)ptr;
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for (size_t i = 0; i < num; i++)
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p[i] = value;
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}
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PDPTE.Present = true;
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PDPTE.SetAddress((uintptr_t)PDEPtr >> 12);
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}
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else
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PDEPtr = (PageDirectoryEntryPtr *)((uintptr_t)PDPTE.GetAddress() << 12);
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PDPTE.raw |= DirectoryFlags;
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PDPTEPtr->Entries[Index.PDPTEIndex] = PDPTE;
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PageDirectoryEntry PDE = PDEPtr->Entries[Index.PDEIndex];
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PageTableEntryPtr *PTEPtr = nullptr;
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if (!PDE.Present)
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{
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PTEPtr = (PageTableEntryPtr *)RequestPage();
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if (PTEPtr == nullptr)
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return;
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{
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void *ptr = PTEPtr;
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uint8_t value = 0;
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size_t num = 0x1000;
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uint8_t *p = (uint8_t *)ptr;
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for (size_t i = 0; i < num; i++)
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p[i] = value;
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}
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PDE.Present = true;
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PDE.SetAddress((uintptr_t)PTEPtr >> 12);
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}
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else
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PTEPtr = (PageTableEntryPtr *)((uintptr_t)PDE.GetAddress() << 12);
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PDE.raw |= DirectoryFlags;
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PDEPtr->Entries[Index.PDEIndex] = PDE;
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PageTableEntry PTE = PTEPtr->Entries[Index.PTEIndex];
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PTE.Present = true;
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PTE.raw |= Flags;
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PTE.SetAddress((uintptr_t)PhysicalAddress >> 12);
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PTEPtr->Entries[Index.PTEIndex] = PTE;
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asmv("invlpg (%0)"
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:
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: "r"(VirtualAddress)
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: "memory");
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}
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EXTERNC __attribute__((section(".bootstrap.text"))) SafeFunction NIF __attribute__((section(".bootstrap.text"))) void UpdatePageTable64()
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{
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BPTable = (PageTable4 *)BootPageTable;
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uintptr_t KernelStart = (uintptr_t)&_kernel_start;
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uintptr_t KernelEnd = (uintptr_t)&_kernel_end;
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uintptr_t PhysicalStart = KernelStart - 0xFFFFFFFF80000000;
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for (uintptr_t i = KernelStart; i < KernelEnd; i += 0x1000)
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{
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MB2_64_Map((void *)i, (void *)PhysicalStart, 0x3);
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PhysicalStart += 0x1000;
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}
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asmv("mov %%cr3, %%rax\n"
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"mov %%rax, %%cr3\n"
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:
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:
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: "rax");
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}
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62
arch/amd64/bootstrap/multiboot/Paging/mb_pt.s
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62
arch/amd64/bootstrap/multiboot/Paging/mb_pt.s
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@ -0,0 +1,62 @@
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/*
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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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PAGE_TABLE_SIZE = 0x4
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.code32
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.section .bootstrap.data, "a"
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.align 0x1000
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.global BootPageTable
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BootPageTable:
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.space 0x10000 /* 0x4000 bytes will be used in UpdatePageTable */
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.section .bootstrap.text, "a"
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.global UpdatePageTable
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UpdatePageTable:
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mov $(BootPageTable + 0x0000), %edi /* First PML4E */
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mov $(BootPageTable + 0x1000), %eax /* First PDPTE */
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or $0x3, %eax /* Bitwise OR on eax (PDPTE) with 11b (Present, Write) */
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mov %eax, (%edi) /* Write 11b to PML4E */
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mov $(BootPageTable + 0x1000), %edi /* First PDPTE */
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mov $(BootPageTable + 0x2000), %eax /* First PDE */
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or $0x3, %eax /* Bitwise OR on eax (PDE) with 11b (Present, Write) */
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mov $PAGE_TABLE_SIZE, %ecx /* For loop instruction */
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mov $0x0, %ebx /* Value to store in the next 4 bytes */
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.FillPageTableLevel3:
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mov %eax, (%edi) /* Store modified PDE in PDPTE */
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mov %ebx, 0x4(%edi) /* Store the ebx value in the next 4 bytes */
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add $0x1000, %eax /* Increment (page size) */
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adc $0x0, %ebx /* Add 0 to carry flag */
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add $0x8, %edi /* Add 8 to edi (next PDE) */
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loop .FillPageTableLevel3 /* Loop until ecx is 0 */
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mov $(BootPageTable + 0x2000), %edi /* First PDE */
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mov $0x83, %eax /* Present, Write, Large Page */
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mov $(512 * PAGE_TABLE_SIZE), %ecx /* For loop instruction */
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mov $0x0, %ebx /* Value to store in the next 4 bytes */
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.FillPageTableLevel2:
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mov %eax, (%edi) /* Store modified PDE in PDPTE */
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mov %ebx, 0x4(%edi) /* Store the ebx value in the next 4 bytes */
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add $0x200000, %eax /* Increment (page size) */
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adc $0x0, %ebx /* Add 0 (carry flag) to ebx to increment if there was a carry */
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add $0x8, %edi /* Add 8 to edi (next PDE) */
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loop .FillPageTableLevel2 /* Loop until ecx is 0 */
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ret
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