204 lines
6.6 KiB
C
204 lines
6.6 KiB
C
/****************************************************************************
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* mm/mm_gran/mm_pgalloc.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <nuttx/pgalloc.h>
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#include "mm_gran/mm_gran.h"
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#ifdef CONFIG_MM_PGALLOC
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* CONFIG_MM_PGALLOC - Enable page allocator support
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* CONFIG_MM_PGSIZE - The page size. Must be one of {1024, 2048,
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* 4096, 8192, or 16384}. This is easily extensible, but only those
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* values are currently support.
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* CONFIG_DEBUG_PGALLOC - Just like CONFIG_DEBUG_MM, but only generates
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* output from the page allocation logic.
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*
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* Dependencies: CONFIG_ARCH_USE_MMU and CONFIG_GRAN
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*/
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/* Debug */
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#ifdef CONFIG_DEBUG_PGALLOC
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# define pgaerr _err
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# define pgawarn _warn
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# define pgainfo _info
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#else
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# define pgaerr merr
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# define pgawarn mwarn
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# define pgainfo minfo
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* The state of the page allocator */
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static GRAN_HANDLE g_pgalloc;
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/****************************************************************************
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* Private Functions
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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: mm_pginitialize
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*
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* Description:
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* Initialize the page allocator.
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*
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* Input Parameters:
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* heap_start - The physical address of the start of memory region that
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* will be used for the page allocator heap
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* heap_size - The size (in bytes) of the memory region that will be used
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* for the page allocator heap.
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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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void mm_pginitialize(FAR void *heap_start, size_t heap_size)
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{
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g_pgalloc = gran_initialize(heap_start, heap_size, MM_PGSHIFT, MM_PGSHIFT);
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DEBUGASSERT(g_pgalloc != NULL);
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}
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/****************************************************************************
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* Name: mm_pgreserve
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*
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* Description:
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* Reserve memory in the page memory pool. This will reserve the pages
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* that contain the start and end addresses plus all of the pages
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* in between. This should be done early in the initialization sequence
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* before any other allocations are made.
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*
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* Reserved memory can never be allocated (it can be freed however which
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* essentially unreserves the memory).
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*
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* Input Parameters:
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* start - The address of the beginning of the region to be reserved.
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* size - The size of the region to be reserved
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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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void mm_pgreserve(uintptr_t start, size_t size)
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{
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FAR void * ret = gran_reserve(g_pgalloc, start, size);
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DEBUGASSERT(ret != NULL);
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}
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/****************************************************************************
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* Name: mm_pgalloc
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*
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* Description:
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* Allocate page memory from the page memory pool.
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*
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* Input Parameters:
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* npages - The number of pages to allocate, each of size CONFIG_MM_PGSIZE.
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*
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* Returned Value:
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* On success, a non-zero, physical address of the allocated page memory
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* is returned. Zero is returned on failure. NOTE: This is an unmapped
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* physical address and cannot be used until it is appropriately mapped.
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*
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****************************************************************************/
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uintptr_t mm_pgalloc(unsigned int npages)
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{
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return (uintptr_t)gran_alloc(g_pgalloc, (size_t)npages << MM_PGSHIFT);
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}
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/****************************************************************************
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* Name: mm_pgfree
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*
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* Description:
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* Return page memory to the page memory pool.
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*
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* Input Parameters:
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* paddr - A physical address to a page in the page memory pool previously
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* allocated by mm_pgalloc.
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* npages - The number of contiguous pages to be return to the page memory
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* pool, beginning with the page at paddr;
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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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void mm_pgfree(uintptr_t paddr, unsigned int npages)
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{
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gran_free(g_pgalloc, (FAR void *)paddr, (size_t)npages << MM_PGSHIFT);
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}
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/****************************************************************************
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* Name: mm_pginfo
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*
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* Description:
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* Return information about the page allocator.
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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 mm_pginfo(FAR struct pginfo_s *info)
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{
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struct graninfo_s graninfo;
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DEBUGASSERT(info != NULL);
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gran_info(g_pgalloc, &graninfo);
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info->ntotal = graninfo.ngranules;
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info->nfree = graninfo.nfree;
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info->mxfree = graninfo.mxfree;
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}
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#endif /* CONFIG_MM_PGALLOC */
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