218 lines
7.3 KiB
C
218 lines
7.3 KiB
C
/****************************************************************************
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* mm/mm_pgalloc.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/gran.h>
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#include <nuttx/pgalloc.h>
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#include "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_CPP_HAVE_VARARGS
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# ifdef CONFIG_DEBUG_PGALLOC
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# define pgadbg(format, ...) dbg(format, ##__VA_ARGS__)
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# define pgavdbg(format, ...) vdbg(format, ##__VA_ARGS__)
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# else
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# define pgadbg(format, ...) mdbg(format, ##__VA_ARGS__)
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# define pgavdbg(format, ...) mvdbg(format, ##__VA_ARGS__)
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# endif
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#else
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# ifdef CONFIG_DEBUG_PGALLOC
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# define pgadbg dbg
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# define pgavdbg vdbg
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# else
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# define pgadbg (void)
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# define pgavdbg (void)
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# endif
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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#ifndef CONFIG_GRAN_SINGLE
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/* The state of the page allocator */
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static GRAN_HANDLE g_pgalloc;
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#endif
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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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#ifdef CONFIG_GRAN_SINGLE
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int ret;
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ret = gran_initialize(heap_start, heap_size, MM_PGSHIFT, MM_PGSHIFT);
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DEBUGASSERT(ret == OK);
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UNUSED(ret);
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#else
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g_pgalloc = gran_initialize(heap_start, heap_size, MM_PGSHIFT, MM_PGSHIFT);
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DEBUGASSERT(pg_alloc != NULL);
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#endif
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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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#ifdef CONFIG_GRAN_SINGLE
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gran_reserve(start, size);
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#else
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gran_reserve(g_pgalloc, start, size);
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#endif
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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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#ifdef CONFIG_GRAN_SINGLE
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return (uintptr_t)gran_alloc((size_t)1 << MM_PGSHIFT);
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#else
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return (uintptr_t)gran_alloc(g_pgalloc, (size_t)1 << MM_PGSHIFT);
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#endif
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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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#ifdef CONFIG_GRAN_SINGLE
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gran_free((FAR void*)paddr, (size_t)npages << MM_PGSHIFT);
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#else
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gran_free(g_pgalloc, (FAR void*)paddr, (size_t)npages << MM_PGSHIFT);
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#endif
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}
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#endif /* CONFIG_MM_PGALLOC */
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