326 lines
10 KiB
C
326 lines
10 KiB
C
/****************************************************************************
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* include/nuttx/mm/map.h
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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 __INCLUDE_NUTTX_MM_MAP_H
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#define __INCLUDE_NUTTX_MM_MAP_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 <nuttx/queue.h>
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#include <nuttx/mutex.h>
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#include <nuttx/mm/gran.h>
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/****************************************************************************
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* Forward declarations
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****************************************************************************/
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struct task_group_s;
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* A memory mapping list item */
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struct mm_map_entry_s
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{
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FAR struct mm_map_entry_s *flink; /* this is used as sq_entry_t */
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FAR void *vaddr;
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size_t length;
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off_t offset;
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int prot;
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int flags;
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union
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{
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FAR void *p;
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int i;
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} priv;
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/* Drivers which register mappings may also implement the unmap function
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* to undo anything done in mmap.
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* Nb. Implementation must NOT use "this_task()->group" since it is not
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* valid during process exit. The argument "group" will be NULL in this
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* case.
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*/
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int (*munmap)(FAR struct task_group_s *group,
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FAR struct mm_map_entry_s *entry,
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FAR void *start,
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size_t length);
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};
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/* memory mapping structure for the task group */
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struct mm_map_s
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{
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sq_queue_t mm_map_sq; /* mappings list */
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size_t map_count; /* mappings list length */
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#ifdef CONFIG_ARCH_VMA_MAPPING
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GRAN_HANDLE mm_map_vpages; /* SHM virtual zone allocator */
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#endif
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rmutex_t mm_map_mutex;
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: mm_map_lock
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*
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* Description:
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* Get exclusive access current task_group's mm_map
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* OK on success
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* A negated errno value on failure
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*
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****************************************************************************/
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int mm_map_lock(void);
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/****************************************************************************
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* Name: mm_map_unlock
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*
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* Description:
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* Relinquish exclusive access to current task_group's mm_map
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void mm_map_unlock(void);
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/****************************************************************************
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* Name: mm_map_initialize
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*
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* Description:
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* Initialization function, called only by group_postinitialize
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*
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* Input Parameters:
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* mm - Pointer to the mm_map structure to be initialized
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* kernel - Indicates whether we are initializing a kernel task
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void mm_map_initialize(FAR struct mm_map_s *mm, bool kernel);
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/****************************************************************************
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* Name: mm_map_destroy
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*
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* Description:
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* Uninitialization function, called only by group_release
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*
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* Input Parameters:
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* mm - Pointer to the mm_map structure to be initialized
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void mm_map_destroy(FAR struct mm_map_s *mm);
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#ifdef CONFIG_ARCH_VMA_MAPPING
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/****************************************************************************
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* Name: vm_alloc_region
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*
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* Description:
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* Allocate virtual memory region from the process virtual memory area.
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*
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* Input Parameters:
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* mm - A reference to the process mm_map struct
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* vaddr - Virtual start address where the allocation starts, if NULL, will
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* seek and return an address that satisfies the 'size' parameter
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* size - Size of the area to allocate
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*
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* Returned Value:
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* Pointer to reserved vaddr, or NULL if out-of-memory
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*
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****************************************************************************/
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FAR void *vm_alloc_region(FAR struct mm_map_s *mm, FAR void *vaddr,
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size_t size);
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/****************************************************************************
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* Name: vm_release_region
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*
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* Description:
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* Free a previously allocated virtual memory region
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*
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* Input Parameters:
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* mm - A reference to the process' mm_map struct
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* vaddr - Virtual start address where the allocation starts.
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* size - Size of the allocated area.
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*
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****************************************************************************/
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void vm_release_region(FAR struct mm_map_s *mm, FAR void *vaddr,
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size_t size);
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#endif
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#ifdef CONFIG_ARCH_VMA_MAPPING
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/****************************************************************************
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* Name: vm_map_region
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*
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* Description:
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* Allocate virtual memory and maps given physical memory into user space
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* of the current process. The mapped region can be larger than requested
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* if given paddr isn't page-aligned, use with care so that not to create
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* unwanted security holes. The returned virtual address has same in-page
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* alignment as given paddr.
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*
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* Input Parameters:
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* paddr - Starting physical address
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* size - Size of the address range
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*
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* Returned Value:
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* Virtual address if success, or NULL if error
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*
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****************************************************************************/
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FAR void *vm_map_region(uintptr_t paddr, size_t size);
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/****************************************************************************
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* Name: vm_unmap_region
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*
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* Description:
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* Unmap previously mapped userspace device and release the virtual memory.
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*
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* Input Parameters:
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* vaddr - Starting virtual address of the mapped device
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* size - Size of the address range
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*
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* Returned Value:
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* OK for success or negative value for error
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*
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****************************************************************************/
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int vm_unmap_region(FAR void *vaddr, size_t size);
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#endif /* CONFIG_ARCH_VMA_MAPPING */
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/****************************************************************************
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* Name: mm_map_add
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*
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* Description:
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* Adds a virtual memory area into the list of mappings
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*
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* Input Parameters:
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* mm - A pointer to mm_map_s, which describes the virtual memory area
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* entry - A pointer to mm_map_entry_s, mapping info to be added
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*
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* Returned Value:
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* OK Added successfully
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* -EINVAL: Invalid attempt to get the semaphore
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* -EINTR: The wait was interrupted by the receipt of a signal.
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* -ENOMEM: Out of memory
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*
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****************************************************************************/
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int mm_map_add(FAR struct mm_map_s *mm, FAR struct mm_map_entry_s *entry);
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/****************************************************************************
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* Name: mm_map_next
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*
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* Description:
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* Returns the next mapping in the list, following the argument.
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* Can be used to iterate through all the mappings. Returns the first
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* mapping when the argument "entry" is NULL.
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*
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* Input Parameters:
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* mm - A pointer to mm_map_s, which describes the virtual memory area
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* entry - Pointer to a single mapping in this task group or NULL to get
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* the first one
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*
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* Returned Value:
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* Pointer to the next mapping
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*
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****************************************************************************/
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FAR struct mm_map_entry_s *mm_map_next(FAR struct mm_map_s *mm,
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FAR const struct mm_map_entry_s *entry);
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/****************************************************************************
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* Name: mm_map_find
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*
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* Description:
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* Find the first mapping matching address and length
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*
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* Input Parameters:
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* mm - A pointer to mm_map_s, which describes the virtual memory area
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* vaddr - Start address of the mapped area
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* length - Length of the mapping
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*
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* Returned Value:
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* Pointer to the mapping, NULL if not found
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*
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****************************************************************************/
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FAR struct mm_map_entry_s *mm_map_find(FAR struct mm_map_s *mm,
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FAR const void *vaddr,
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size_t length);
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/****************************************************************************
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* Name: mm_map_remove
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*
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* Description:
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* Removes a virtual memory area from the list of mappings
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* Sets the given pointer argument to NULL after successful removal
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*
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* Input Parameters:
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* mm - Pointer to the list of entries, from which the entry is
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* removed. If passed mm is NULL, the function doesn't do
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* anything, but just returns OK.
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*
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* entry - Pointer to the entry to be removed. If the passed entry is
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* NULL the function doesn't do anything but just returns OK
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*
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* Returned Value:
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* OK: Removed successfully
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* -EINVAL: Invalid attempt to get the semaphore
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* -EINTR: The wait was interrupted by the receipt of a signal.
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* -ENOENT: Memory area not found
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*
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****************************************************************************/
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int mm_map_remove(FAR struct mm_map_s *mm,
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FAR struct mm_map_entry_s *entry);
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#endif /* __INCLUDE_NUTTX_MM_MAP_H */
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