196 lines
6.8 KiB
C
196 lines
6.8 KiB
C
/****************************************************************************
|
|
* include/nuttx/pgalloc.h
|
|
* Page memory allocator.
|
|
*
|
|
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __INCLUDE_NUTTX_PGALLOC_H
|
|
#define __INCLUDE_NUTTX_PGALLOC_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <stdint.h>
|
|
|
|
#ifdef CONFIG_MM_PGALLOC
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
/* Configuration ************************************************************/
|
|
/* CONFIG_MM_PGALLOC - Enable page allocator support
|
|
* CONFIG_MM_PGSIZE - The page size. Must be one of {1024, 2048,
|
|
* 4096, 8192, or 16384}. This is easily extensible, but only those
|
|
* values are currently support.
|
|
* CONFIG_DEBUG_PGALLOC - Just like CONFIG_DEBUG_MM, but only generates
|
|
* output from the page allocation logic.
|
|
*
|
|
* Dependencies: CONFIG_ARCH_USE_MMU and CONFIG_GRAN
|
|
*/
|
|
|
|
#ifndef CONFIG_MM_PGALLOC_PGSIZE
|
|
# define CONFIG_MM_PGALLOC_PGSIZE 4096
|
|
#endif
|
|
|
|
#if CONFIG_MM_PGSIZE == 1024
|
|
# define MM_PGSIZE 1024
|
|
# define MM_PGSHIFT 10
|
|
#elif CONFIG_MM_PGSIZE == 2048
|
|
# define MM_PGSIZE 2048
|
|
# define MM_PGSHIFT 11
|
|
#elif CONFIG_MM_PGSIZE == 4096
|
|
# define MM_PGSIZE 4096
|
|
# define MM_PGSHIFT 12
|
|
#elif CONFIG_MM_PGSIZE == 8192
|
|
# define MM_PGSIZE 8192
|
|
# define MM_PGSHIFT 13
|
|
#elif CONFIG_MM_PGSIZE == 16384
|
|
# define MM_PGSIZE 16384
|
|
# define MM_PGSHIFT 14
|
|
#else
|
|
# error CONFIG_MM_PGSIZE not supported
|
|
#endif
|
|
|
|
#define MM_PGMASK (MM_PGSIZE - 1)
|
|
#define MM_PGALIGNDOWN(a) ((uintptr_t)(a) & ~MM_PGMASK)
|
|
#define MM_PGALIGNUP(a) (((uintptr_t)(a) + MM_PGMASK) & ~MM_PGMASK)
|
|
#define MM_NPAGES(s) (((uintptr_t)(s) + MM_PGMASK) >> MM_PGSHIFT)
|
|
#define MM_ISALIGNED(a) (((uintptr_t)(a) & MM_PGMASK) == 0)
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
#ifdef __cplusplus
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: mm_pginitialize
|
|
*
|
|
* Description:
|
|
* Initialize the page allocator.
|
|
*
|
|
* Input Parameters:
|
|
* heap_start - The physical address of the start of memory region that
|
|
* will be used for the page allocator heap
|
|
* heap_size - The size (in bytes) of the memory region that will be used
|
|
* for the page allocator heap.
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void mm_pginitialize(FAR void *heap_start, size_t heap_size);
|
|
|
|
/****************************************************************************
|
|
* Name: mm_pgreserve
|
|
*
|
|
* Description:
|
|
* Reserve memory in the page memory pool. This will reserve the pages
|
|
* that contain the start and end addresses plus all of the pages
|
|
* in between. This should be done early in the initialization sequence
|
|
* before any other allocations are made.
|
|
*
|
|
* Reserved memory can never be allocated (it can be freed however which
|
|
* essentially unreserves the memory).
|
|
*
|
|
* Input Parameters:
|
|
* start - The address of the beginning of the region to be reserved.
|
|
* size - The size of the region to be reserved
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void mm_pgreserve(uintptr_t start, size_t size);
|
|
|
|
/****************************************************************************
|
|
* Name: mm_pgalloc
|
|
*
|
|
* Description:
|
|
* Allocate page memory from the page memory pool.
|
|
*
|
|
* Input Parameters:
|
|
* npages - The number of pages to allocate, each of size CONFIG_MM_PGSIZE.
|
|
*
|
|
* Returned Value:
|
|
* On success, a non-zero, physical address of the allocated page memory
|
|
* is returned. Zero is returned on failure. NOTE: This is an unmapped
|
|
* physical address and cannot be used until it is appropriately mapped.
|
|
*
|
|
****************************************************************************/
|
|
|
|
uintptr_t mm_pgalloc(unsigned int npages);
|
|
|
|
/****************************************************************************
|
|
* Name: mm_pgfree
|
|
*
|
|
* Description:
|
|
* Return page memory to the page memory pool.
|
|
*
|
|
* Input Parameters:
|
|
* paddr - A physical address to a page in the page memory pool previously
|
|
* allocated by mm_pgalloc.
|
|
* npages - The number of contiguous pages to be return to the page memory
|
|
* pool, beginning with the page at paddr;
|
|
*
|
|
* Returned Value:
|
|
* None
|
|
*
|
|
****************************************************************************/
|
|
|
|
void mm_pgfree(uintptr_t paddr, unsigned int npages);
|
|
|
|
#undef EXTERN
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_MM_PGALLOC */
|
|
#endif /* __INCLUDE_NUTTX_PGALLOC_H */
|