630 lines
15 KiB
C
630 lines
15 KiB
C
/****************************************************************************
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* mm/mm_gran/mm_graninfo.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 <nuttx/mm/gran.h>
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#include "mm_gran/mm_gran.h"
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#ifdef CONFIG_GRAN
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/****************************************************************************
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* Private Data
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****************************************************************************/
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struct nibble_info_s
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{
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uint16_t nfree : 4; /* Total bits free in a nibble */
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uint16_t nlsfree : 4; /* Total contiguous LS bits free */
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uint16_t nmsfree : 4; /* Total contiguous MS bits free */
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uint16_t mxfree : 4; /* Largest internal contiguous bits free */
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};
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struct valinfo_s
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{
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uint8_t nfree; /* Total bits free in the byte/hword */
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uint8_t nlsfree; /* Total contiguous LS bits free */
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uint8_t nmsfree; /* Total contiguous MS bits free */
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uint8_t mxfree; /* Largest internal contiguous bits free */
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};
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct nibble_info_s g_0bit_info[1] =
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{
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{ /* 0 xxxx */
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0, 0, 0, 0
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}
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};
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static const struct nibble_info_s g_1bit_info[2] =
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{
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{ /* 0 xxx0 */
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1, 1, 0, 0
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},
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{ /* 1 xxx1 */
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0, 0, 0, 0
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}
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};
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static const struct nibble_info_s g_2bit_info[4] =
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{
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{ /* 0 xx00 */
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2, 2, 0, 0
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},
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{ /* 1 xx01 */
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1, 0, 1, 0
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},
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{ /* 2 xx10 */
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1, 1, 0, 0
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},
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{ /* 3 xx11 */
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0, 0, 0, 0
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}
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};
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static const struct nibble_info_s g_3bit_info[8] =
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{
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{ /* 0 x000 */
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3, 3, 0, 0
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},
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{ /* 1 x001 */
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2, 0, 2, 0
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},
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{ /* 2 x010 */
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2, 1, 1, 0
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},
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{ /* 3 x011 */
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1, 0, 1, 0
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},
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{ /* 4 x100 */
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2, 2, 0, 0
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},
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{ /* 5 x101 */
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1, 0, 0, 1
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},
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{ /* 6 x110 */
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1, 1, 0, 0
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},
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{ /* 7 x111 */
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0, 0, 0, 0
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}
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};
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static const struct nibble_info_s g_4bit_info[16] =
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{
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{ /* 0 0000 */
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4, 4, 0, 0
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},
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{ /* 1 0001 */
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3, 0, 3, 0
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},
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{ /* 2 0010 */
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3, 1, 2, 0
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},
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{ /* 3 0011 */
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2, 0, 2, 0
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},
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{ /* 4 0100 */
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3, 2, 1, 0
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},
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{ /* 5 0101 */
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2, 0, 1, 1
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},
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{ /* 6 0110 */
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2, 1, 1, 0
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},
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{ /* 7 0111 */
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1, 0, 1, 0
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},
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{ /* 8 1000 */
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3, 3, 0, 0
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},
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{ /* 9 1001 */
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2, 0, 0, 2
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},
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{ /* 10 1010 */
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2, 1, 0, 1
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},
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{ /* 11 1011 */
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1, 0, 0, 1
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},
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{ /* 12 1100 */
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2, 2, 0, 0
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},
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{ /* 13 1101 */
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1, 0, 0, 1
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},
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{ /* 14 1110 */
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1, 1, 0, 0
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},
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{ /* 15 1111 */
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0, 0, 0, 0
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}
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};
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static const struct nibble_info_s *g_info_table[5] =
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{
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g_0bit_info,
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g_1bit_info,
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g_2bit_info,
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g_3bit_info,
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g_4bit_info
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: gran_nibble_info
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*
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* Description:
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* Return information for a 4-bit value from the GAT.
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*
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* Input Parameters:
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* value - The 4-bit value
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* info - The location to return the hword info
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* nbits - Number of valid bits in value
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void gran_nibble_info(uint8_t value, FAR struct valinfo_s *info,
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unsigned int nbits)
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{
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FAR const struct nibble_info_s *table = g_info_table[nbits];
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FAR const struct nibble_info_s *nibinfo;
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uint8_t mask;
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/* Look up the table entry */
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mask = ((1 << nbits) - 1);
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value &= mask;
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nibinfo = &table[value];
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/* Return expanded values */
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info->nfree = nibinfo->nfree;
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info->nlsfree = nibinfo->nlsfree;
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info->nmsfree = nibinfo->nmsfree;
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info->mxfree = nibinfo->mxfree;
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}
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/****************************************************************************
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* Name: gran_info_combine
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*
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* Description:
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* Combine new MS bit information with existing LS bit information.
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*
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* Input Parameters:
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* msinfo - The new MS bit information
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* msbits - Number of bits in MS piece
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* lsinfo - The existing LS bit information
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void gran_info_combine(FAR const struct valinfo_s *msinfo,
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unsigned int msbits,
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FAR struct valinfo_s *lsinfo,
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unsigned int lsbits)
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{
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unsigned int midfree;
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/* Is there a region of free space isolated in the middle of the two
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* pieces?
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*/
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if (lsinfo->nlsfree < lsbits && msinfo->nlsfree < msbits)
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{
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/* Yes... combine the MS free bits from the LS piece with the
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* LS free bits from the MS piece.
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*/
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midfree = lsinfo->nmsfree + msinfo->nlsfree;
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}
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else
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{
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midfree = 0;
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}
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/* Update the total number of free bits in the combined pieces */
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lsinfo->nfree += msinfo->nfree;
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/* Figure out how many MS bits will now be free. First, is the MS piece
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* all free?
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*/
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if (msinfo->nlsfree == msbits)
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{
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/* Yes.. is the LS piece also all free bits? */
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if (lsinfo->nlsfree == lsbits)
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{
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/* Yes.. the there are no MS free bits (only LS) */
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lsinfo->nmsfree = 0;
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}
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else
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{
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/* No.. then combine all of the bits from the MS piece with the
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* MS bits of the LS piece.
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*/
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lsinfo->nmsfree += msbits;
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}
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}
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else
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{
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/* No.. then just replace the MS bits of the LS piece with the MS
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* bits from the new MS piece.
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*/
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lsinfo->nmsfree = msinfo->nmsfree;
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}
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/* Figure out how many LS bits will now be free. First, is the LS piece
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* all free?
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*/
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if (lsinfo->nlsfree == lsbits)
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{
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/* Yes.. then combine all of the bits from the LS piece with the
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* LS bits of the MS piece.
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*/
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lsinfo->nlsfree += msinfo->nlsfree;
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}
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/* Now, what is the longest internal sequence of the free bits? It might
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* be original sequence of free bits in the LS piece. Or it might the
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* section of middle bits that got above.
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*/
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if (midfree > lsinfo->mxfree)
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{
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lsinfo->mxfree = midfree;
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}
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/* Or it might the section of middle bits in the new MS piece */
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if (msinfo->mxfree > lsinfo->mxfree)
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{
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lsinfo->mxfree = msinfo->mxfree;
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}
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}
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/****************************************************************************
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* Name: gran_byte_info
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*
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* Description:
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* Return information a 8-bit value from the GAT.
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*
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* Input Parameters:
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* value - The 16-bit value
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* info - The location to return the hword info
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* nbits - Number of valid bits in value
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void gran_byte_info(uint8_t value, FAR struct valinfo_s *info,
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unsigned int nbits)
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{
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uint8_t mask;
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if (nbits < 8)
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{
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mask = ((1 << nbits) - 1);
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value &= mask;
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}
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else
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{
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mask = 0xff;
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}
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/* Handle special cases */
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if (value == 0)
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{
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/* All free */
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info->nfree = nbits;
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info->nlsfree = nbits;
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info->nmsfree = 0;
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info->mxfree = 0;
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}
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else if (value == mask)
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{
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/* All allocated */
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info->nfree = 0;
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info->nlsfree = 0;
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info->nmsfree = 0;
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info->mxfree = 0;
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}
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else
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{
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/* Some allocated */
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gran_nibble_info(value & 0x0f, info, nbits > 4 ? 4 : nbits);
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if (nbits > 4)
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{
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struct valinfo_s msinfo;
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unsigned int msbits = nbits - 4;
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gran_nibble_info(value >> 4, &msinfo, msbits);
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gran_info_combine(&msinfo, msbits, info, 4);
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}
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}
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}
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/****************************************************************************
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* Name: gran_hword_info
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*
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* Description:
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* Return information a 16-bit value from the GAT.
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*
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* Input Parameters:
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* value - The 16-bit value
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* info - The location to return the hword info
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* nbits - Number of valid bits in value
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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static void gran_hword_info(uint16_t value, FAR struct valinfo_s *info,
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unsigned int nbits)
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{
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uint16_t mask;
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if (nbits < 16)
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{
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mask = ((1 << nbits) - 1);
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value &= mask;
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}
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else
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{
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mask = 0xffff;
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}
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/* Handle special cases */
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if (value == 0)
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{
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/* All free */
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info->nfree = nbits;
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info->nlsfree = nbits;
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info->nmsfree = 0;
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info->mxfree = 0;
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}
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else if (value == mask)
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{
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/* All allocated */
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info->nfree = 0;
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info->nlsfree = 0;
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info->nmsfree = 0;
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info->mxfree = 0;
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}
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else
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{
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/* Some allocated */
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gran_byte_info((uint8_t)(value & 0xff), info, nbits > 8 ? 8 : nbits);
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if (nbits > 8)
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{
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struct valinfo_s msinfo;
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unsigned int msbits = nbits - 8;
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gran_byte_info((uint8_t)(value >> 8), &msinfo, msbits);
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gran_info_combine(&msinfo, msbits, info, 8);
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}
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: gran_info
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*
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* Description:
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* Return information about the granule heap.
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*
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* Input Parameters:
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* handle - The handle previously returned by gran_initialize
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* info - Memory location to return the gran allocator info.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is return on
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* any failure.
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*
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****************************************************************************/
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void gran_info(GRAN_HANDLE handle, FAR struct graninfo_s *info)
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{
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FAR struct gran_s *priv = (FAR struct gran_s *)handle;
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uint32_t mask;
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uint32_t value;
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uint16_t mxfree;
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unsigned int nbits;
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unsigned int granidx;
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unsigned int gatidx;
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int ret;
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DEBUGASSERT(priv != NULL && info != NULL);
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info->log2gran = priv->log2gran;
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info->ngranules = priv->ngranules;
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info->nfree = 0;
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info->mxfree = 0;
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mxfree = 0;
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/* Get exclusive access to the GAT */
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ret = gran_enter_critical(priv);
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if (ret < 0)
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{
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/* Should happen only on task cancellation */
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DEBUGASSERT(ret == -ECANCELED);
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return;
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}
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/* Traverse the granule allocation */
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for (granidx = 0; granidx < priv->ngranules; granidx += 32)
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{
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/* Get the GAT index associated with the granule table entry */
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gatidx = granidx >> 5;
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value = priv->gat[gatidx];
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/* The final entry is a special case */
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if ((granidx + 32) > priv->ngranules)
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{
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nbits = priv->ngranules - granidx;
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mask = ((1ul << nbits) - 1);
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value &= mask;
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}
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else
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{
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nbits = 32;
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mask = 0xffffffff;
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}
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/* Handle the 32-bit cases */
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if (value == mask)
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{
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/* All allocated. This will terminate any sequence of free
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* granules.
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*/
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if (mxfree > info->mxfree)
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{
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info->mxfree = mxfree;
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}
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mxfree = 0;
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}
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else if (value == 0x00000000)
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{
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/* All free */
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info->nfree += nbits;
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mxfree += nbits;
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}
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else
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{
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struct valinfo_s hwinfo;
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/* Some allocated */
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gran_hword_info((uint16_t)(value & 0xffff), &hwinfo,
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nbits > 16 ? 16 : nbits);
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if (nbits > 16)
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{
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struct valinfo_s msinfo;
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unsigned int msbits = nbits - 16;
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gran_hword_info((uint16_t)(value >> 16), &msinfo, msbits);
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gran_info_combine(&msinfo, msbits, &hwinfo, 16);
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}
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/* Update the running free sequence of granules */
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if (hwinfo.nlsfree > 0)
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{
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mxfree += hwinfo.nlsfree;
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}
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/* If the entire word is not free, then update the maxfree free
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* sequence.
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*/
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if (hwinfo.nlsfree < nbits)
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{
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/* Is the sequence internally free bits in the 32-bit value
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* longer than the running free sequence?
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*/
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if (hwinfo.mxfree > mxfree)
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{
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mxfree = hwinfo.mxfree;
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}
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/* Is the running free sequence longer than the last sequence
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* that we saw?
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*/
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if (mxfree > info->mxfree)
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{
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info->mxfree = mxfree;
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}
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/* Then restart with the free MS granules */
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mxfree = hwinfo.nmsfree;
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}
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/* Update the total number of free granules */
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info->nfree += hwinfo.nfree;
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}
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}
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/* Check if the last, unterminated sequence of free granules was
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* the longest
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*/
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if (mxfree > info->mxfree)
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{
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info->mxfree = mxfree;
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}
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gran_leave_critical(priv);
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}
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#endif /* CONFIG_GRAN */
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