152 lines
5.5 KiB
C
152 lines
5.5 KiB
C
/****************************************************************************
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* arch/arm/src/sama5/sam_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 <sys/types.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/addrenv.h>
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#include <nuttx/pgalloc.h>
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#include "chip.h"
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#include "mmu.h"
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#include "sam_pgalloc.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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/* Currently, page cache memory must be allocated in DRAM. There are other
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* possibilities, but the logic in this file will have to extended in order
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* handle any other possibility.
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*/
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#ifndef CONFIG_SAMA5_DDRCS_PGHEAP
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# error CONFIG_SAMA5_DDRCS_PGHEAP must be selected
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#endif
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#ifndef CONFIG_SAMA5_DDRCS_PGHEAP_OFFSET
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# error CONFIG_SAMA5_DDRCS_PGHEAP_OFFSET must be specified
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#endif
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#if (CONFIG_SAMA5_DDRCS_PGHEAP_OFFSET & MM_PGMASK) != 0
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# warning CONFIG_SAMA5_DDRCS_PGHEAP_OFFSET is not aligned to a page boundary
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#endif
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#ifndef CONFIG_SAMA5_DDRCS_PGHEAP_SIZE
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# error CONFIG_SAMA5_DDRCS_PGHEAP_SIZE must be specified
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#endif
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#if (CONFIG_SAMA5_DDRCS_PGHEAP_SIZE & MM_PGMASK) != 0
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# warning CONFIG_SAMA5_DDRCS_PGHEAP_SIZE is not aligned to a page boundary
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#endif
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/****************************************************************************
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* Private Data
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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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_allocate_pgheap
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*
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* Description:
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* If there is a page allocator in the configuration, then this function
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* must be provided by the platform-specific code. The OS initialization
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* logic will call this function early in the initialization sequence to
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* get the page heap information needed to configure the page allocator.
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*
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****************************************************************************/
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void up_allocate_pgheap(FAR void **heap_start, size_t *heap_size)
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{
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DEBUGASSERT(heap_start && heap_size);
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*heap_start = (FAR void *)((uintptr_t)SAM_DDRCS_PSECTION +
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CONFIG_SAMA5_DDRCS_PGHEAP_OFFSET);
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*heap_size = CONFIG_SAMA5_DDRCS_PGHEAP_SIZE;
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}
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/****************************************************************************
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* Name: sam_virtpgaddr
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*
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* Description:
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* Check if the physical address lies in the page pool and, if so
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* get the mapping to the virtual address in the user data area.
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*
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****************************************************************************/
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#ifndef CONFIG_ARCH_PGPOOL_MAPPING
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uintptr_t sam_virtpgaddr(uintptr_t paddr)
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{
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uintptr_t poolstart;
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uintptr_t poolend;
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/* REVISIT: Not implemented correctly. The reverse lookup from physical
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* to virtual. This will return a kernel accessible virtual address, but
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* not an address usable by the user code.
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*
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* The correct solutions is complex and, perhaps, will never be needed.
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*/
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poolstart = ((uintptr_t)SAM_DDRCS_PSECTION + CONFIG_SAMA5_DDRCS_PGHEAP_OFFSET);
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poolend = poolstart + CONFIG_SAMA5_DDRCS_PGHEAP_SIZE;
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if (paddr >= poolstart && paddr < poolend)
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{
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return paddr - SAM_DDRCS_PSECTION + SAM_DDRCS_VSECTION;
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}
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return 0;
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}
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#endif /* !CONFIG_ARCH_PGPOOL_MAPPING */
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#endif /* CONFIG_MM_PGALLOC */
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