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/****************************************************************************
* arch/arm/src/armv7-a/arm_phypgaddr.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 <sys/types.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/addrenv.h>
#include <nuttx/pgalloc.h>
#include "chip.h"
#include "mmu.h"
#include "cache.h"
#include "pgalloc.h"
#ifdef CONFIG_MM_PGALLOC
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: arm_physpgaddr
*
* Description:
* Check if the virtual address lies in the user data area and, if so
* get the mapping to the physical address in the page pool.
*
****************************************************************************/
uintptr_t arm_physpgaddr(uintptr_t vaddr)
{
FAR uint32_t *l2table;
uintptr_t paddr;
uint32_t l1entry;
#ifndef CONFIG_ARCH_PGPOOL_MAPPING
uint32_t l1save;
#endif
int index;
/* Check if this address is within the range of one of the virtualized user
* address regions.
*/
if (arm_uservaddr(vaddr))
{
/* Yes.. Get Level 1 page table entry corresponding to this virtual
* address.
*/
l1entry = mmu_l1_getentry(vaddr);
if ((l1entry & PMD_TYPE_MASK) == PMD_TYPE_PTE)
{
/* Get the physical address of the level 2 page table from the
* level 1 page table entry.
*/
paddr = ((uintptr_t)l1entry & PMD_PTE_PADDR_MASK);
#ifdef CONFIG_ARCH_PGPOOL_MAPPING
/* Get the virtual address of the base of level 2 page table */
l2table = (FAR uint32_t *)arm_pgvaddr(paddr);
#else
/* Temporarily map the page into the virtual address space */
l1save = mmu_l1_getentry(ARCH_SCRATCH_VBASE);
mmu_l1_setentry(paddr & ~SECTION_MASK, ARCH_SCRATCH_VBASE, MMU_MEMFLAGS);
l2table = (FAR uint32_t *)(ARCH_SCRATCH_VBASE | (paddr & SECTION_MASK));
#endif
if (l2table)
{
/* Invalidate D-Cache line containing this virtual address so that
* we re-read from physical memory
*/
index = (vaddr & SECTION_MASK) >> MM_PGSHIFT;
arch_invalidate_dcache((uintptr_t)&l2table[index],
(uintptr_t)&l2table[index] + sizeof(uint32_t));
/* Get the Level 2 page table entry corresponding to this virtual
* address. Extract the physical address of the page containing
* the mapping of the virtual address.
*/
paddr = ((uintptr_t)l2table[index] & PTE_SMALL_PADDR_MASK);
#ifndef CONFIG_ARCH_PGPOOL_MAPPING
/* Restore the scratch section L1 page table entry */
mmu_l1_restore(ARCH_SCRATCH_VBASE, l1save);
#endif
/* Add the correct offset and return the physical address
* corresponding to the virtual address.
*/
return paddr + (vaddr & MM_PGMASK);
}
}
}
/* No mapping available */
return 0;
}
#endif /* CONFIG_MM_PGALLOC */
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