102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*
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* Copyright (c) 2018 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_MISC_MEMPOOL_H_
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#define ZEPHYR_INCLUDE_MISC_MEMPOOL_H_
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#include <kernel.h>
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#include <misc/mempool_base.h>
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#include <misc/mutex.h>
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struct sys_mem_pool {
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struct sys_mem_pool_base base;
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struct sys_mutex mutex;
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};
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struct sys_mem_pool_block {
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struct sys_mem_pool *pool;
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u32_t level : 4;
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u32_t block : 28;
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};
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/**
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* @brief Statically define system memory pool
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*
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* The memory pool's buffer contains @a n_max blocks that are @a max_size bytes
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* long. The memory pool allows blocks to be repeatedly partitioned into
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* quarters, down to blocks of @a min_size bytes long. The buffer is aligned
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* to a @a align -byte boundary.
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*
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* If the pool is to be accessed outside the module where it is defined, it
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* can be declared via
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*
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* @code extern struct sys_mem_pool <name>; @endcode
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*
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* This pool will not be in an initialized state. You will still need to
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* run sys_mem_pool_init() on it before using any other APIs.
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*
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* @param name Name of the memory pool.
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* @param ignored ignored, any value
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* @param minsz Size of the smallest blocks in the pool (in bytes).
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* @param maxsz Size of the largest blocks in the pool (in bytes).
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* @param nmax Number of maximum sized blocks in the pool.
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* @param align Alignment of the pool's buffer (power of 2).
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* @param section Destination binary section for pool data
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*/
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#define SYS_MEM_POOL_DEFINE(name, ignored, minsz, maxsz, nmax, align, section) \
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char __aligned(align) Z_GENERIC_SECTION(section) \
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_mpool_buf_##name[_ALIGN4(maxsz * nmax) \
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+ _MPOOL_BITS_SIZE(maxsz, minsz, nmax)]; \
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struct sys_mem_pool_lvl Z_GENERIC_SECTION(section) \
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_mpool_lvls_##name[Z_MPOOL_LVLS(maxsz, minsz)]; \
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Z_GENERIC_SECTION(section) struct sys_mem_pool name = { \
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.base = { \
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.buf = _mpool_buf_##name, \
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.max_sz = maxsz, \
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.n_max = nmax, \
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.n_levels = Z_MPOOL_LVLS(maxsz, minsz), \
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.levels = _mpool_lvls_##name, \
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.flags = SYS_MEM_POOL_USER \
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} \
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}
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/**
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* @brief Initialize a memory pool
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*
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* This is intended to complete initialization of memory pools that have been
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* declared with SYS_MEM_POOL_DEFINE().
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*
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* @param p Memory pool to initialize
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*/
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static inline void sys_mem_pool_init(struct sys_mem_pool *p)
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{
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z_sys_mem_pool_base_init(&p->base);
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}
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/**
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* @brief Allocate a block of memory
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*
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* Allocate a chunk of memory from a memory pool. This cannot be called from
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* interrupt context.
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*
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* @param p Address of the memory pool
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* @param size Requested size of the memory block
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* @return A pointer to the requested memory, or NULL if none is available
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*/
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void *sys_mem_pool_alloc(struct sys_mem_pool *p, size_t size);
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/**
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* @brief Free memory allocated from a memory pool
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*
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* Free memory previously allocated by sys_mem_pool_alloc().
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* It is safe to pass NULL to this function, in which case it is a no-op.
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*
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* @param ptr Pointer to previously allocated memory
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*/
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void sys_mem_pool_free(void *ptr);
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#endif
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