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/****************************************************************************
* arch/arm/src/armv7-a/pgalloc.h
*
* 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.
*
****************************************************************************/
#ifndef __ARCH_ARM_SRC_ARMV7_A_PGALLOC_H
#define __ARCH_ARM_SRC_ARMV7_A_PGALLOC_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <assert.h>
#include <nuttx/addrenv.h>
#include "mmu.h"
#ifdef CONFIG_MM_PGALLOC
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Inline Functions
****************************************************************************/
/****************************************************************************
* Name: arm_pgmap
*
* Description:
* Map one page to a temporary, scratch virtual memory address
*
****************************************************************************/
#if !defined(CONFIG_ARCH_PGPOOL_MAPPING) && defined(CONFIG_ARCH_USE_MMU)
static inline uintptr_t arm_tmpmap(uintptr_t paddr, FAR uint32_t *l1save)
{
*l1save = mmu_l1_getentry(ARCH_SCRATCH_VBASE);
mmu_l1_setentry(paddr & ~SECTION_MASK, ARCH_SCRATCH_VBASE, MMU_MEMFLAGS);
return ((uintptr_t)ARCH_SCRATCH_VBASE | (paddr & SECTION_MASK));
}
#endif
/****************************************************************************
* Name: arm_pgrestore
*
* Description:
* Restore any previous L1 page table mapping that was in place when
* arm_tmpmap() was called
*
****************************************************************************/
#if !defined(CONFIG_ARCH_PGPOOL_MAPPING) && defined(CONFIG_ARCH_USE_MMU)
static inline void arm_tmprestore(uint32_t l1save)
{
mmu_l1_restore(ARCH_SCRATCH_VBASE, l1save);
}
#endif
/****************************************************************************
* Name: arm_pgvaddr
*
* Description:
* If the page memory pool is statically mapped, then we do not have to
* go through the the temporary mapping. We simply have to perform a
* physical to virtual memory address mapping.
*
****************************************************************************/
#ifdef CONFIG_ARCH_PGPOOL_MAPPING
static inline uintptr_t arm_pgvaddr(uintptr_t paddr)
{
DEBUGASSERT(paddr >= CONFIG_ARCH_PGPOOL_PBASE &&
paddr < CONFIG_ARCH_PGPOOL_PEND);
return paddr - CONFIG_ARCH_PGPOOL_PBASE + CONFIG_ARCH_PGPOOL_VBASE;
}
#endif
/****************************************************************************
* Name: arm_uservaddr
*
* Description:
* Return true if the virtual address, vaddr, lies in the user address
* space.
*
****************************************************************************/
static inline bool arm_uservaddr(uintptr_t vaddr)
{
/* Check if this address is within the range of the virtualized .bss/.data,
* heap, or stack regions.
*/
return ((vaddr >= CONFIG_ARCH_TEXT_VBASE && vaddr < ARCH_TEXT_VEND) ||
(vaddr >= CONFIG_ARCH_DATA_VBASE && vaddr < ARCH_DATA_VEND) ||
(vaddr >= CONFIG_ARCH_HEAP_VBASE && vaddr < ARCH_HEAP_VEND)
#ifdef CONFIG_ARCH_STACK_DYNAMIC
|| (vaddr >= CONFIG_ARCH_STACK_VBASE && vaddr < ARCH_STACK_VEND)
#endif
#ifdef CONFIG_MM_SHM
|| (vaddr >= CONFIG_ARCH_SHM_VBASE && vaddr < ARCH_SHM_VEND)
#endif
);
}
/****************************************************************************
* Name: set_l2_entry
*
* Description:
* Set the L2 table entry as part of the initialization of the L2 Page
* table.
*
****************************************************************************/
static inline void set_l2_entry(FAR uint32_t *l2table, uintptr_t paddr,
uintptr_t vaddr, uint32_t mmuflags)
{
uint32_t index;
/* The table divides a 1Mb address space up into 256 entries, each
* corresponding to 4Kb of address space. The page table index is
* related to the offset from the beginning of 1Mb region.
*/
index = (vaddr & 0x000ff000) >> 12;
/* Save the level 2 page table entry */
l2table[index] = (paddr | mmuflags);
}
/****************************************************************************
* Name: clr_l2_entry
*
* Description:
* Claear the L2 table entry.
*
****************************************************************************/
static inline void clr_l2_entry(FAR uint32_t *l2table, uintptr_t vaddr)
{
uint32_t index;
/* The table divides a 1Mb address space up into 256 entries, each
* corresponding to 4Kb of address space. The page table index is
* related to the offset from the beginning of 1Mb region.
*/
index = (vaddr & 0x000ff000) >> 12;
/* Save the level 2 page table entry */
l2table[index] = 0;
}
/****************************************************************************
* Name: get_l2_entry
*
* Description:
* Set the L2 table entry as part of the initialization of the L2 Page
* table.
*
****************************************************************************/
static inline uintptr_t get_l2_entry(FAR uint32_t *l2table, uintptr_t vaddr)
{
uint32_t index;
/* The table divides a 1Mb address space up into 256 entries, each
* corresponding to 4Kb of address space. The page table index is
* related to the offset from the beginning of 1Mb region.
*/
index = (vaddr & 0x000ff000) >> 12;
/* Return the level 2 page table entry */
return l2table[index];
}
/****************************************************************************
* 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);
/****************************************************************************
* 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.
*
****************************************************************************/
#ifdef CONFIG_ARCH_PGPOOL_MAPPING
uintptr_t arm_virtpgaddr(uintptr_t paddr);
#endif
#endif /* CONFIG_MM_PGALLOC */
#endif /* __ARCH_ARM_SRC_ARMV7_A_PGALLOC_H */
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