77 lines
3.1 KiB
C
77 lines
3.1 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/arm_virtpgaddr.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 "pgalloc.h"
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#if defined(CONFIG_MM_PGALLOC) && defined(CONFIG_ARCH_PGPOOL_MAPPING)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arm_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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uintptr_t arm_virtpgaddr(uintptr_t paddr)
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{
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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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if (paddr >= CONFIG_ARCH_PGPOOL_PBASE && paddr < CONFIG_ARCH_PGPOOL_PEND)
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{
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return paddr - CONFIG_ARCH_PGPOOL_PBASE + CONFIG_ARCH_PGPOOL_VBASE;
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}
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return 0;
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}
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#endif /* CONFIG_MM_PGALLOC && CONFIG_ARCH_PGPOOL_MAPPING */
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