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/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __SLAB_H__
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#define __SLAB_H__
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#include <list.h>
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#include <synch/spinlock.h>
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#include <arch/atomic.h>
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/** Minimum size to be allocated by malloc */
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#define SLAB_MIN_MALLOC_W 3
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/** Maximum size to be allocated by malloc */
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#define SLAB_MAX_MALLOC_W 17
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/** Initial Magazine size (TODO: dynamically growing magazines) */
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#define SLAB_MAG_SIZE  4
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/** If object size is less, store control structure inside SLAB */
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#define SLAB_INSIDE_SIZE   (PAGE_SIZE >> 3)
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/** Maximum wasted space we allow for cache */
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#define SLAB_MAX_BADNESS(cache)   ((PAGE_SIZE << (cache)->order) >> 2)
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/* slab_reclaim constants */
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#define SLAB_RECLAIM_ALL  0x1 /**< Reclaim all possible memory, because
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                   *   we are in memory stress */
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/* cache_create flags */
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#define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */
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#define SLAB_CACHE_SLINSIDE   0x2 /**< Have control structure inside SLAB */
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typedef struct {
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    link_t link;
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    count_t busy;  /**< Count of full slots in magazine */
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    count_t size;  /**< Number of slots in magazine */
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    void *objs[0]; /**< Slots in magazine */
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}slab_magazine_t;
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typedef struct {
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    char *name;
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    link_t link;
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    /* Configuration */
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    size_t size;      /**< Size of SLAB position - align_up(sizeof(obj)) */
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    int (*constructor)(void *obj, int kmflag);
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    void (*destructor)(void *obj);
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    int flags;        /**< Flags changing behaviour of cache */
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    /* Computed values */
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    __u8 order;        /**< Order of frames to be allocated */
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    int objects;      /**< Number of objects that fit in */
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    /* Statistics */
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    atomic_t allocated_slabs;
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    atomic_t allocated_objs;
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    atomic_t cached_objs;
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    /* Slabs */
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    link_t full_slabs;     /**< List of full slabs */
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    link_t partial_slabs;  /**< List of partial slabs */
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    SPINLOCK_DECLARE(slablock);
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    /* Magazines  */
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    link_t magazines;      /**< List o full magazines */
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    SPINLOCK_DECLARE(maglock);
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    /** CPU cache */
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    struct {
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        slab_magazine_t *current;
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        slab_magazine_t *last;
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        SPINLOCK_DECLARE(lock);
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    }mag_cache[0];
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}slab_cache_t;
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extern slab_cache_t * slab_cache_create(char *name,
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                    size_t size,
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                    size_t align,
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                    int (*constructor)(void *obj, int kmflag),
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                    void (*destructor)(void *obj),
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                    int flags);
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extern void slab_cache_destroy(slab_cache_t *cache);
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extern void * slab_alloc(slab_cache_t *cache, int flags);
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extern void slab_free(slab_cache_t *cache, void *obj);
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extern count_t slab_reclaim(int flags);
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/** Initialize SLAB subsytem */
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extern void slab_cache_init(void);
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/* KConsole debug */
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extern void slab_print_list(void);
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/* Malloc support */
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extern void * kalloc(unsigned int size, int flags);
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extern void kfree(void *obj);
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#endif