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/**
* @file block.h
*
* Header file for the memory pool block
*
* Copyright (C) 2000 by Mike Perry.
* Distributed WITHOUT WARRANTY under the GPL. See COPYING for details.
*/
#ifndef __NJ_LIB_BLOCK_H__
#define __NJ_LIB_BLOCK_H__
#include <config.h>
#include <lib/entry_pool.h>
struct nj_block
{
nj_addr_t addr;
nj_addr_t user_chunk;
nj_entry_index_t *idx;
size_t size;
};
/**@{ @name Block size macros */
/** Align the length to int alignment for the fencepost afterwards.
* Add the fencepost size
* add the whichever is larger:
* the overhead due to the user's requested alignment as compared
* to malloc's alignment
* or
* the aligned index marker
*/
#define NJ_PROT_NONE_BLOCK_SIZE(len, align) \
(NJ_ALIGN_UP((len), NJ_INT_ALIGNMENT) + sizeof(NJ_FENCEPOST) + \
NJ_MAX((align > LIBC_MALLOC_ALIGNMENT ? \
align - LIBC_MALLOC_ALIGNMENT : 0), \
NJ_ALIGN_UP(sizeof(nj_entry_index_t), align)))
/**
* Add space for aligned length (this will account for aligned base
* because we do offset = PAGE - len)
* add space for the heap entry before the buffer
* add space for the fencepost before the buffer (which must start
* on an int aligned boundary)
* Round the whole thing to a 2-page block
*/
#define NJ_PROT_OVER_BLOCK_SIZE(len, align) \
(NJ_ROUND_TO_BLOCK(NJ_ALIGN_UP(NJ_ALIGN_UP(len, align) \
+ sizeof(nj_entry_index_t), NJ_INT_ALIGNMENT) \
+ sizeof(NJ_FENCEPOST)))
/** Add space for length and entry, aligned for the fencepost
* Add the fencepost
* Round to 2-page block
*/
#define NJ_PROT_UNDER_BLOCK_SIZE(len, align) \
(NJ_ROUND_TO_BLOCK(NJ_ALIGN_UP(len + NJ_ALIGN_UP(sizeof(nj_entry_index_t), align), NJ_INT_ALIGNMENT) + sizeof(NJ_FENCEPOST)))
/**
* Add space for the length, aligned to fencepost
* add space for the fencepost
* Round the whole thing to 2-page block
* Heap entry is in the proected page.. it will fit with no prob :)
*/
#define NJ_PROT_SUNDER_BLOCK_SIZE(len, align) \
(NJ_ROUND_TO_BLOCK(NJ_ALIGN_UP(len, NJ_INT_ALIGNMENT) + sizeof(NJ_FENCEPOST)))
/*@}*/
size_t __nj_block_calc_size(int, int, int);
void __nj_block_init(struct nj_block *block, nj_addr_t addr,
size_t block_len, size_t user_len, struct nj_dynamic_prefs prefs);
void __nj_block_renew(struct nj_block *block, nj_addr_t addr,
size_t block_len, size_t user_len,
void *(*move_data)(void *, const void *, size_t),
nj_addr_t old_chunk, size_t old_user_len,
struct nj_dynamic_prefs prefs);
#endif /* block.h */
// vim:ts=4
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