183 lines
5.8 KiB
C
183 lines
5.8 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/pgalloc.h
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*
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* SPDX-License-Identifier: Apache-2.0
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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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#ifndef __ARCH_ARM_SRC_ARMV7_A_PGALLOC_H
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#define __ARCH_ARM_SRC_ARMV7_A_PGALLOC_H
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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 <stdint.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <nuttx/addrenv.h>
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#include "mmu.h"
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#ifdef CONFIG_MM_PGALLOC
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_ARCH_PGPOOL_MAPPING
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# error "ARMv7-A needs CONFIG_ARCH_PGPOOL_MAPPING"
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Inline Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arm_pgvaddr
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*
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* Description:
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* If the page memory pool is statically mapped, then we do not have to
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* go through the temporary mapping. We simply have to perform a
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* physical to virtual memory address mapping.
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*
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****************************************************************************/
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static inline uintptr_t arm_pgvaddr(uintptr_t paddr)
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{
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DEBUGASSERT(paddr >= CONFIG_ARCH_PGPOOL_PBASE &&
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paddr < CONFIG_ARCH_PGPOOL_PEND);
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return paddr - CONFIG_ARCH_PGPOOL_PBASE + CONFIG_ARCH_PGPOOL_VBASE;
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}
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/****************************************************************************
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* Name: arm_uservaddr
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*
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* Description:
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* Return true if the virtual address, vaddr, lies in the user address
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* space.
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*
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****************************************************************************/
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static inline bool arm_uservaddr(uintptr_t vaddr)
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{
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/* Check if this address is within the range of the virtualized .bss/.data,
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* heap, or stack regions.
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*/
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return ((vaddr >= CONFIG_ARCH_TEXT_VBASE && vaddr < ARCH_TEXT_VEND) ||
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(vaddr >= CONFIG_ARCH_DATA_VBASE && vaddr < ARCH_DATA_VEND) ||
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(vaddr >= CONFIG_ARCH_HEAP_VBASE && vaddr < ARCH_HEAP_VEND)
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#ifdef CONFIG_ARCH_STACK_DYNAMIC
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|| (vaddr >= CONFIG_ARCH_STACK_VBASE && vaddr < ARCH_STACK_VEND)
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#endif
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#ifdef CONFIG_ARCH_VMA_MAPPING
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|| (vaddr >= CONFIG_ARCH_SHM_VBASE && vaddr < ARCH_SHM_VEND)
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#endif
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);
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}
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/****************************************************************************
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* Name: set_l2_entry
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*
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* Description:
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* Set the L2 table entry as part of the initialization of the L2 Page
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* table.
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*
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****************************************************************************/
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static inline void set_l2_entry(uintptr_t *l2table, uintptr_t paddr,
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uintptr_t vaddr, uint32_t mmuflags)
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{
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uint32_t index;
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/* The table divides a 1Mb address space up into 256 entries, each
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* corresponding to 4Kb of address space. The page table index is
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* related to the offset from the beginning of 1Mb region.
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*/
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index = (vaddr & 0x000ff000) >> 12;
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/* Save the level 2 page table entry */
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l2table[index] = (paddr | mmuflags);
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}
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/****************************************************************************
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* Name: clr_l2_entry
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*
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* Description:
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* Claear the L2 table entry.
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*
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****************************************************************************/
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static inline void clr_l2_entry(uintptr_t *l2table, uintptr_t vaddr)
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{
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uint32_t index;
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/* The table divides a 1Mb address space up into 256 entries, each
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* corresponding to 4Kb of address space. The page table index is
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* related to the offset from the beginning of 1Mb region.
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*/
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index = (vaddr & 0x000ff000) >> 12;
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/* Save the level 2 page table entry */
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l2table[index] = 0;
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}
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/****************************************************************************
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* Name: get_l2_entry
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*
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* Description:
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* Set the L2 table entry as part of the initialization of the L2 Page
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* table.
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*
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****************************************************************************/
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static inline uintptr_t get_l2_entry(uintptr_t *l2table, uintptr_t vaddr)
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{
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uint32_t index;
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/* The table divides a 1Mb address space up into 256 entries, each
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* corresponding to 4Kb of address space. The page table index is
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* related to the offset from the beginning of 1Mb region.
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*/
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index = (vaddr & 0x000ff000) >> 12;
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/* Return the level 2 page table entry */
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return l2table[index];
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}
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/****************************************************************************
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* Public Functions Prototypes
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****************************************************************************/
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#endif /* CONFIG_MM_PGALLOC */
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#endif /* __ARCH_ARM_SRC_ARMV7_A_PGALLOC_H */
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