ARM64Paging.h

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/*
 * Copyright (C) 2025 Ivan Tan
 * Copyright (C) 2015 Niek Linnenbank
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef __LIBARCH_ARM64_PAGING_H
#define __LIBARCH_ARM64_PAGING_H
 
#include <Types.h>
#include "MemoryContext.h"
#include "MemoryMap.h"
 
class SplitAllocator;
class ARM64FirstTable;
 
//Learn the architecture - AArch64 memory attributes and properties
#define MEM_ATTR_NORMAL 0xff //normal, IWBWA, OWBWA, NTR
#define MEM_ATTR_DEV    0x04 //device, nGnRE
#define MEM_ATTR_NC     0x44 //non cacheable
#define MAIR_FIELD(val, idx) ((val)<<((idx)<<3))
 
class ARM64Paging : public MemoryContext
{
  public:
 
    ARM64Paging(MemoryMap *map, SplitAllocator *alloc);
 
    ARM64Paging(MemoryMap *map, Address firstTableAddress, Address kernelBaseAddress);
 
    virtual ~ARM64Paging();
 
    virtual Result initialize();
 
    virtual Result activate(bool initializeMMU = false);
 
    virtual Result map(Address virt, Address phys, Memory::Access access);
 
    virtual Result unmap(Address virt);
 
    virtual Result lookup(Address virt, Address *phys) const;
 
    virtual Result access(Address virt, Memory::Access *access) const;
 
    virtual Result releaseSection(const Memory::Range & range,
                                  const bool tablesOnly = false);
 
    virtual Result releaseRange(Memory::Range *range);
 
  private:
 
    void setupPageTable(MemoryMap *map, Address firstTableAddress, Address kernelBaseAddress);
 
    MemoryContext::Result allocPageTable(Allocator::Range &phys, Allocator::Range &virt);
 
    Result enableMMU();
 
  private:
 
    ARM64FirstTable *m_firstTable;
 
    Address m_firstTableAddr;
 
    Address m_kernelBaseAddr;
};
 
namespace Arch
{
    typedef ARM64Paging Memory;
};
 
#endif /* __LIBARCH_ARM64_PAGING_H */