//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:       Memory allocation 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 _LIB_LIST_H
#include <lib/list.h>
#endif

#ifndef _MM_MALLOC_H
#define _MM_MALLOC_H

#ifndef PAGESIZE
#define PAGESIZE 4096
#endif

typedef struct Cache_t          Cache_t;
typedef struct Pool_t           Pool_t;

// Operation on objects
typedef void    (*ObjCtor_t)(Cache_t *cache,
                             Pool_t *pool,
                             void *obj);
//
// A cache containing many pools
//
struct Cache_t
{
    // Synchronization
    Spinlock_t      lock;

    // Cache name
    char            name[64];
    
    // Size of each object
    size_t          objsize;
    
    // Number of objects allocated
    size_t          objused;
    
    // Number of available objects including unused
    size_t          objtotal;
    
    // Number of objects per pool
    size_t          objperpool;

    // Object constructor
    ObjOper_t      *ctor;
    
    // Object destructor
    ObjOper_t      *dtor;

    // Object pools without any allocated object
    ListHead_t     *freepools;
    
    // Object pools containing some allocated objects
    ListHead_t     *usedpools;
    
    // Objects pools containing no unallocated object
    ListHead_t     *fullpools;
};

//
// A pool of allocable objects
// Takes a fixed amount of pages
//
struct Pool_t
{

};

//
// Allocates memory from the kernel heap
//
void *kmalloc(size_t req, uint flags);
void *kmemalign(size_t req, uint align, uint flags);

#endif