ARM64FirstTable.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_FIRSTTABLE_H
#define __LIBARCH_ARM64_FIRSTTABLE_H
 
#include <FreeNOS/System.h>
#include <Types.h>
#include <MemoryContext.h>
#include "ARM64SecondTable.h"
 
class SplitAllocator;
 
class ARM64FirstTable
{
  public:
 
    MemoryContext::Result map(Address virt,
                              Address phys,
                              Memory::Access access,
                              SplitAllocator *alloc);
 
    MemoryContext::Result mapLarge(Memory::Range range,
                                   SplitAllocator *alloc);
 
    MemoryContext::Result unmap(Address virt,
                                SplitAllocator *alloc);
 
    MemoryContext::Result translate(Address virt,
                                    Address *phys,
                                    SplitAllocator *alloc) const;
 
    MemoryContext::Result access(Address virt,
                                 Memory::Access *access,
                                 SplitAllocator *alloc) const;
 
    MemoryContext::Result releaseSection(const Memory::Range range,
                                         SplitAllocator *alloc,
                                         const bool tablesOnly);
 
    MemoryContext::Result releaseRange(const Memory::Range range,
                                       SplitAllocator *alloc);
 
    static void initialize(ARM64FirstTable *firstTable);
    
  private:
 
    inline void releasePhysical(SplitAllocator *alloc,
                                const Address phys);
 
    ARM64SecondTable * getSecondTable(Address virt,
                                    SplitAllocator *alloc) const;
 
    u32 flags(Memory::Access access) const;
 
    u64 get_l2_entry(Address virt, SplitAllocator *alloc, u64 **tbl_l2, unsigned int *l2_idx) const;
 
  private:
 
    u64 m_tables_l1[512];    /* level 1 table, only maps to 0 - 4G */
    u64 m_tables_l2[4][512]; /* virtual address 0-1/1-2/2-3/3-4 G */
};
 
#endif /* __LIBARCH_ARM64_FIRSTTABLE_H */