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/*
* Copyright (c) 2011 Free Software Foundation.
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Copyright (c) 2010, 2011 Richard Braun.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
* Object caching memory allocator.
*/
#ifndef _KERN_SLAB_H
#define _KERN_SLAB_H
#include <cache.h>
#include <mach/machine/vm_types.h>
#include <sys/types.h>
#include <vm/vm_types.h>
/*
* Object cache.
*/
struct kmem_cache;
/*
* Type for constructor functions.
*
* The pre-constructed state of an object is supposed to include only
* elements such as e.g. linked lists, locks, reference counters. Therefore
* constructors are expected to 1) never block, 2) never fail and 3) not
* need any user-provided data. As a result, object construction never
* performs dynamic resource allocation, which removes the need for
* destructors.
*/
typedef void (*kmem_ctor_fn_t)(void *);
/*
* Types for slab allocation/free functions.
*
* All addresses and sizes must be page-aligned.
*/
typedef vm_offset_t (*kmem_slab_alloc_fn_t)(vm_size_t);
typedef void (*kmem_slab_free_fn_t)(vm_offset_t, vm_size_t);
#include <kern/slab_i.h>
/*
* Mach-style declarations for struct kmem_cache.
*/
typedef struct kmem_cache *kmem_cache_t;
#define KMEM_CACHE_NULL ((kmem_cache_t) 0)
/*
* VM submap for slab allocations.
*/
extern vm_map_t kmem_map;
/*
* Cache initialization flags.
*/
#define KMEM_CACHE_NOCPUPOOL 0x1 /* Don't use the per-cpu pools */
#define KMEM_CACHE_NOOFFSLAB 0x2 /* Don't allocate external slab data */
#define KMEM_CACHE_VERIFY 0x4 /* Use debugging facilities */
/*
* Initialize a cache.
*
* If a slab allocation/free function pointer is NULL, the default backend
* (vm_kmem on the kernel map) is used for the allocation/free action.
*/
void kmem_cache_init(struct kmem_cache *cache, const char *name,
size_t obj_size, size_t align, kmem_ctor_fn_t ctor,
kmem_slab_alloc_fn_t slab_alloc_fn,
kmem_slab_free_fn_t slab_free_fn, int flags);
/*
* Allocate an object from a cache.
*/
vm_offset_t kmem_cache_alloc(struct kmem_cache *cache);
/*
* Release an object to its cache.
*/
void kmem_cache_free(struct kmem_cache *cache, vm_offset_t obj);
/*
* Initialize the memory allocator module.
*/
void slab_bootstrap(void);
void slab_init(void);
/*
* Release free slabs to the VM system.
*/
void slab_collect(void);
/*
* Display a summary of all kernel caches.
*/
void slab_info(void);
#endif /* _KERN_SLAB_H */
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