92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
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/****************************************************************************
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* mm/map/vm_map.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 <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/mm/map.h>
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#include <nuttx/pgalloc.h>
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#include <nuttx/sched.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#ifdef CONFIG_ARCH_VMA_MAPPING
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/* map physical region to userspace */
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FAR void *vm_map_region(uintptr_t paddr, size_t size)
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{
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FAR void *vaddr;
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uintptr_t tvaddr;
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uint i = 0;
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int ret = OK;
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size_t npages = MM_NPAGES(size);
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DEBUGASSERT(npages > 0);
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DEBUGASSERT(MM_ISALIGNED(paddr));
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vaddr = vm_alloc_region(get_current_mm(), 0, size);
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if (vaddr)
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{
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tvaddr = (uintptr_t)vaddr;
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for (; i < npages; i++, tvaddr += MM_PGSIZE, paddr += MM_PGSIZE)
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{
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ret = up_shmat(&paddr, 1, tvaddr);
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if (ret)
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{
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goto errorout;
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}
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}
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}
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return vaddr;
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errorout:
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if (i) /* undo mapped pages */
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{
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up_shmdt((uintptr_t)vaddr, i);
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}
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vm_release_region(get_current_mm(), vaddr, size);
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return 0;
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}
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/* unmap userspace device pointer */
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int vm_unmap_region(FAR void *vaddr, size_t size)
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{
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size_t npages = MM_NPAGES(size);
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int ret;
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DEBUGASSERT(MM_ISALIGNED(vaddr));
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DEBUGASSERT(npages);
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ret = up_shmdt((uintptr_t)vaddr, npages);
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vm_release_region(get_current_mm(), vaddr, size);
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return ret;
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}
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#endif /* CONFIG_ARCH_VMA_MAPPING */
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