102a62c7e3
This patch refactors granule allocator to remove the 32 granules limitation with the help of a gran_range_s structure and related functions, see "mm_grantable.h" for details. Below are the major functions explaining how this works: - The gran_match() checks if a gran range all in the given state. it gives last mismatch position when fails free range matching. - The gran_search() tries to find the position of a free range. It leverages last mismatch position from gran_match() to speed up the search. range size handling is mainly in gran_match() and gran_set_(). Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>
123 lines
4.1 KiB
C
123 lines
4.1 KiB
C
/****************************************************************************
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* mm/mm_gran/mm_gran.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __MM_MM_GRAN_MM_GRAN_H
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#define __MM_MM_GRAN_MM_GRAN_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <arch/types.h>
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#include <nuttx/mm/gran.h>
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#include <nuttx/mutex.h>
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#include <nuttx/spinlock.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Sizes of things */
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#define SIZEOF_GAT(n) \
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((n + 31) >> 5)
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#define SIZEOF_GRAN_S(n) \
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(sizeof(struct gran_s) + sizeof(uint32_t) * (SIZEOF_GAT(n) - 1))
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/* Debug */
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#ifdef CONFIG_DEBUG_GRAN
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# define granerr _err
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# define granwarn _warn
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# define graninfo _info
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#else
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# define granerr merr
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# define granwarn mwarn
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# define graninfo minfo
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* This structure represents the state of one granule allocation */
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struct gran_s
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{
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uint8_t log2gran; /* Log base 2 of the size of one granule */
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uint16_t ngranules; /* The total number of (aligned) granules in the heap */
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#ifdef CONFIG_GRAN_INTR
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irqstate_t irqstate; /* For exclusive access to the GAT */
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spinlock_t lock;
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#else
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mutex_t lock; /* For exclusive access to the GAT */
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#endif
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uintptr_t heapstart; /* The aligned start of the granule heap */
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uint32_t gat[1]; /* Start of the granule allocation table */
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: gran_enter_critical and gran_leave_critical
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*
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* Description:
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* Critical section management for the granule allocator.
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*
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* Input Parameters:
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* priv - Pointer to the gran state
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*
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* Returned Value:
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* gran_enter_critical() may return any error reported by
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* nxsem_wait_uninterruptible()
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*
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****************************************************************************/
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int gran_enter_critical(FAR struct gran_s *priv);
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void gran_leave_critical(FAR struct gran_s *priv);
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/****************************************************************************
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* Name: gran_mark_allocated
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*
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* Description:
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* Mark a range of granules as allocated.
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*
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* Input Parameters:
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* priv - The granule heap state structure.
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* alloc - The address of the allocation.
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* ngranules - The number of granules allocated
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*
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* Returned Value:
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* On success, a non-NULL pointer to the allocated memory is returned;
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* NULL is returned on failure.
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*
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****************************************************************************/
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FAR void *gran_mark_allocated(FAR struct gran_s *priv, uintptr_t alloc,
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unsigned int ngranules);
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#endif /* __MM_MM_GRAN_MM_GRAN_H */
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