/****************************************************************************
* arch/arm/src/armv7-a/arm_virtpgaddr.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 "pgalloc.h"
#if defined(CONFIG_MM_PGALLOC) && defined(CONFIG_ARCH_PGPOOL_MAPPING)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: arm_virtpgaddr
*
* Description:
* Check if the physical address lies in the page pool and, if so
* get the mapping to the virtual address in the user data area.
*
****************************************************************************/
uintptr_t arm_virtpgaddr(uintptr_t paddr)
{
/* REVISIT: Not implemented correctly. The reverse lookup from physical
* to virtual. This will return a kernel accessible virtual address, but
* not an address usable by the user code.
*
* The correct solutions is complex and, perhaps, will never be needed.
*/
if (paddr >= CONFIG_ARCH_PGPOOL_PBASE && paddr < CONFIG_ARCH_PGPOOL_PEND)
{
return paddr - CONFIG_ARCH_PGPOOL_PBASE + CONFIG_ARCH_PGPOOL_VBASE;
}
return 0;
}
#endif /* CONFIG_MM_PGALLOC && CONFIG_ARCH_PGPOOL_MAPPING*/
