139 lines
4.7 KiB
C
139 lines
4.7 KiB
C
/****************************************************************************
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* arch/arm/src/sama5/sam_pgalloc.c
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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 <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(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 = (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 +
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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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