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>
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/****************************************************************************
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* mm/mm_gran/mm_granreserve.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_reserve(GRAN_HANDLE handle, uintptr_t start, size_t size)
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{
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FAR gran_t *gran = (FAR gran_t *)handle;
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uintptr_t end;
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size_t ngran;
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size_t posi;
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bool avail;
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DEBUGASSERT(gran);
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if (!size || size > GRANBYTE(gran))
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{
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return NULL;
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}
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/* align down/up start/ending addresses */
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end = END_RSRV(gran, start, size);
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if (!GRAN_INRANGE(gran, end))
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{
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return NULL;
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}
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start = MEM_RSRV(gran, start);
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if (!GRAN_INRANGE(gran, start))
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{
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return NULL;
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}
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/* convert unit to granule */
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posi = MEM2GRAN(gran, start);
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ngran = ((end - start) >> gran->log2gran) + 1;
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/* lock the granule allocator */
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if (gran_enter_critical(gran) < 0)
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{
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return NULL;
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}
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avail = gran_match(gran, posi, ngran, 0, NULL);
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if (avail)
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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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graninfo("%s posi=%zu retp=%zx size=%zu n=%zu\n",
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avail ? " done" : " error", posi, (size_t)start, size, ngran);
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return avail ? (FAR void *)start : NULL;
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}
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#endif /* CONFIG_GRAN */
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