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Diffstat (limited to 'nuttx/mm/mm_pgalloc.c')
| -rw-r--r-- | nuttx/mm/mm_pgalloc.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/nuttx/mm/mm_pgalloc.c b/nuttx/mm/mm_pgalloc.c new file mode 100644 index 000000000..f270ce67a --- /dev/null +++ b/nuttx/mm/mm_pgalloc.c @@ -0,0 +1,223 @@ +/**************************************************************************** + * mm/mm_pgalloc.c + * + * 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <assert.h> + +#include <nuttx/gran.h> +#include <nuttx/pgalloc.h> + +#include "mm_gran.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_MM_PGPOOL_PADDR - Physical address of the start of the page + * memory pool. This will be aligned to the page size if it is not + * already aligned. + * CONFIG_MM_PGPOOL_SIZE - The size of the page memory pool in bytes. This + * will be aligned if it is not already aligned. + * CONFIG_DEBUG_PGALLOC - Just like CONFIG_DEBUG_MM, but only generates + * output from the page allocation logic. + * + * Dependencies: CONFIG_ARCH_HAVE_MMU and CONFIG_GRAN + */ + +/* Debug */ + +#ifdef CONFIG_CPP_HAVE_VARARGS +# ifdef CONFIG_DEBUG_PGALLOC +# define pgadbg(format, ...) dbg(format, ##__VA_ARGS__) +# define pgavdbg(format, ...) vdbg(format, ##__VA_ARGS__) +# else +# define pgadbg(format, ...) mdbg(format, ##__VA_ARGS__) +# define pgavdbg(format, ...) mvdbg(format, ##__VA_ARGS__) +# endif +#else +# ifdef CONFIG_DEBUG_PGALLOC +# define pgadbg dbg +# define pgavdbg vdbg +# else +# define pgadbg (void) +# define pgavdbg (void) +# endif +#endif + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +#ifndef CONFIG_GRAN_SINGLE +/* The state of the page allocator */ + +static GRAN_HANDLE g_pgalloc; +#endif + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: mm_pginitialize + * + * Description: + * Initialize the page allocator. + * + * Input Parameters: + * None + * + * Returned Value: + * Mpme + * + ****************************************************************************/ + +void mm_pginitialize(void) +{ +#ifdef CONFIG_GRAN_SINGLE + int ret; + + ret = gran_initialize((FAR void *)CONFIG_MM_PGPOOL_PADDR, + CONFIG_MM_PGPOOL_SIZE, + MM_PGSHIFT, MM_PGSHIFT); + DEBUGASSERT(ret == OK); + UNUSED(ret); + +#else + g_pgalloc = gran_initialize((FAR void *)CONFIG_MM_PGPOOL_PADDR, + CONFIG_MM_PGPOOL_SIZE, + MM_PGSHIFT, MM_PGSHIFT); + DEBUGASSERT(pg_alloc != NULL); + +#endif +} + +/**************************************************************************** + * 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) +{ +#ifdef CONFIG_GRAN_SINGLE + gran_reserve(start, size); +#else + gran_reserve(g_pgalloc, start, size); +#endif +} + +/**************************************************************************** + * 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) +{ +#ifdef CONFIG_GRAN_SINGLE + return (uintptr_t)gran_alloc((size_t)1 << MM_PGSHIFT); +#else + return (uintptr_t)gran_alloc(g_pgalloc, (size_t)1 << MM_PGSHIFT); +#endif +} + +/**************************************************************************** + * 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) +{ +#ifdef CONFIG_GRAN_SINGLE + gran_free((FAR void*)paddr, (size_t)npages << MM_PGSHIFT); +#else + gran_free(g_pgalloc, (FAR void*)paddr, (size_t)npages << MM_PGSHIFT); +#endif +} + +#endif /* CONFIG_MM_PGALLOC */ |