//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:         Paging memory related functions                             //
//                                                                            //
//                                                                            //
//  Copyright © 2018-2019 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K 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         //
//  any later version.                                                        //
//                                                                            //
//  OS/K 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 OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#ifndef _KERNEL_H
#include <kernel.h>
#endif

#ifndef _MM_PAGING_H
#define _MM_PAGING_H

//----------------------------------------------------------------------------//

#define KPAGESIZE (4 * KB)
#define UPAGESIZE (4 * KB)
#define USERSPACE 0x200000000

//----------------------------------------------------------------------------//

// Page table entry
typedef ulong    pte_t;

// Page directory offset
typedef pte_t*    pde_t;

// Page directory pointer offset
typedef pde_t*    pdpe_t;

// Page directory L4 pointer offset
typedef pdpe_t*   pml4_t;

enum
{
    PRESENT      = 1 << 0,
    READWRITE    = 1 << 1,
    USERMODE     = 1 << 2,
    WRITETHR     = 1 << 3,
    CACHEDIS     = 1 << 4,
    ACCESSED     = 1 << 5,
    DIRTY        = 1 << 6,
    HUGE         = 1 << 7,
    NX           = 1UL << 63
};

//----------------------------------------------------------------------------//

//
// Paging activation
//
void MmInitPaging(void);

void MmActivatePageHandler(void);

//
// Returns the address of the stack guard pages
//
void *MmGetStackGuards(char rank);

//
// Translate a virtual address into physical address and the opposite
//
void *MmTransVirtToPhyAddr(void*);
void *MmTransPhyToVirtAddr(void* virtualAddr);

//
// Set flags to a page
//
void MmSetPage(void* virtualAddr, ulong flags);
void MmUnSetPage(void* virtualAddr, ulong flags);

//
// Map a page
//
void MmMapPage(void* virtualAddr, void* physicalAddr, ulong flags);
void MmUnmapPage(void* virtualAddr);

//
// Paging misc
//
void MmLoadPML4(void *);
void MmEnableWriteProtect(void);
void MmDisableWriteProtect(void);

//----------------------------------------------------------------------------//

#endif