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>
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/****************************************************************************
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* mm/mm_gran/mm_granalloc.c
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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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/mm/gran.h>
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#include "mm_gran/mm_gran.h"
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#include "mm_gran/mm_grantable.h"
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#ifdef CONFIG_GRAN
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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FAR void *gran_alloc(GRAN_HANDLE handle, size_t size)
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{
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FAR gran_t *gran = (FAR gran_t *)handle;
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size_t ngran;
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int posi;
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int ret;
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uintptr_t retp;
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DEBUGASSERT(gran);
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ngran = NGRANULE(gran, size);
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if (!ngran || ngran > gran->ngranules)
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{
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return NULL;
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}
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ret = gran_enter_critical(gran);
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if (ret < 0)
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{
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return NULL;
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}
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posi = gran_search(gran, ngran);
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if (posi >= 0)
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{
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gran_set(gran, posi, ngran);
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}
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gran_leave_critical(gran);
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if (posi < 0)
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{
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return NULL;
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}
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retp = gran->heapstart + (posi << gran->log2gran);
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graninfo("heap=%"PRIxPTR" posi=%d retp=%"PRIxPTR" size=%zu n=%zu\n",
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gran->heapstart, posi, retp, size, ngran);
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DEBUGASSERT(retp >= gran->heapstart);
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DEBUGASSERT(retp < gran->heapstart + GRANBYTE(gran));
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return (FAR void *)retp;
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}
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#endif /* CONFIG_GRAN */
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