You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
3.4 KiB
117 lines
3.4 KiB
3 months ago
|
/*
|
||
|
|
* Copyright (c) 2006-2022, RT-Thread Development Team
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: Apache-2.0
|
||
|
|
*
|
||
|
|
* Change Logs:
|
||
|
|
* Date Author Notes
|
||
|
|
* 2022-11-23 WangXiaoyao the first version
|
||
|
|
*/
|
||
|
|
#ifndef __MM_FLAG_H__
|
||
|
|
#define __MM_FLAG_H__
|
||
|
|
|
||
|
|
#include <rtthread.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief mm_flag_t
|
||
|
|
* |max ------- 7|6 ----- 0|
|
||
|
|
* | control | align |
|
||
|
|
*
|
||
|
|
* there should be no more than 25 flags
|
||
|
|
*/
|
||
|
|
typedef unsigned long mm_flag_t;
|
||
|
|
|
||
|
|
#define _MMF_CNTL_SHIFT 7
|
||
|
|
#define _MMF_ALIGN_MASK 0x7f
|
||
|
|
#define _MMF_CNTL_MASK (~((1 << _MMF_CNTL_SHIFT) - 1))
|
||
|
|
#define _DEF_FLAG(index) (1 << (_MMF_CNTL_SHIFT + (index)))
|
||
|
|
|
||
|
|
enum mm_flag_cntl
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* @brief Modifications to the mapped data shall be visible only to the
|
||
|
|
* aspace only and shall not change the underlying object. It is
|
||
|
|
* unspecified whether modifications to the underlying object done after
|
||
|
|
* the MAP_PRIVATE mapping is established are visible through the
|
||
|
|
* MAP_PRIVATE mapping.
|
||
|
|
*/
|
||
|
|
MMF_MAP_PRIVATE = _DEF_FLAG(0),
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Same as MMF_MAP_PRIVATE, except the modification after mapping is
|
||
|
|
* invisible to the varea
|
||
|
|
*/
|
||
|
|
MMF_MAP_PRIVATE_DONT_SYNC = _DEF_FLAG(1),
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief [POSIX MAP_FIXED] When MAP_FIXED is set in the flags argument, the
|
||
|
|
* implementation is informed that the value of pa shall be addr, exactly.
|
||
|
|
* If a MAP_FIXED request is successful, the mapping established
|
||
|
|
* by mmap() replaces any previous mappings for the pages in the range
|
||
|
|
* [pa,pa+len) of the process.
|
||
|
|
*/
|
||
|
|
MMF_MAP_FIXED = _DEF_FLAG(2),
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief The backup page frame is allocated and setted only until it is
|
||
|
|
* truly necessary by the user
|
||
|
|
*/
|
||
|
|
MMF_PREFETCH = _DEF_FLAG(3),
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Allocate the mapping using "huge" pages
|
||
|
|
*/
|
||
|
|
MMF_HUGEPAGE = _DEF_FLAG(4),
|
||
|
|
|
||
|
|
/** internal reserved flags */
|
||
|
|
MMF_TEXT = _DEF_FLAG(5),
|
||
|
|
|
||
|
|
/** internal reserved flags */
|
||
|
|
MMF_STATIC_ALLOC = _DEF_FLAG(6),
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Shared mapping. Updates to the mapping are visible to other
|
||
|
|
* processes mapping the same region, and are carried through to the
|
||
|
|
* underlying file.
|
||
|
|
*/
|
||
|
|
MMF_MAP_SHARED = _DEF_FLAG(7),
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief a non-locked memory can be swapped out when required, this is
|
||
|
|
* reserved for future
|
||
|
|
*/
|
||
|
|
MMF_NONLOCKED = _DEF_FLAG(8),
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief An alignment is specified in flags that the mapping must admit
|
||
|
|
*/
|
||
|
|
MMF_REQUEST_ALIGN = _DEF_FLAG(9),
|
||
|
|
|
||
|
|
__MMF_INVALID,
|
||
|
|
};
|
||
|
|
|
||
|
|
#define MMF_GET_ALIGN(src) ((src & _MMF_ALIGN_MASK))
|
||
|
|
#define MMF_SET_ALIGN(src, align) \
|
||
|
|
((src & ~_MMF_ALIGN_MASK) | (__builtin_ffsl(align) - 1))
|
||
|
|
|
||
|
|
#define MMF_GET_CNTL(src) (src & _MMF_CNTL_MASK)
|
||
|
|
#define MMF_TEST_CNTL(src, flag) (src & flag)
|
||
|
|
#define MMF_SET_CNTL(src, flag) ((src) | (flag))
|
||
|
|
#define MMF_CLEAR_CNTL(src, flag) ((src) & ~(flag))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Create Flags
|
||
|
|
*
|
||
|
|
* example: MMF_CREATE(0, 0)
|
||
|
|
* MMF_CREATE(MMF_MAP_FIXED, 0x2000)
|
||
|
|
*
|
||
|
|
* Direct use of flag is also acceptable: (MMF_MAP_FIXED | MMF_PREFETCH)
|
||
|
|
*/
|
||
|
|
#define MMF_CREATE(cntl, align) \
|
||
|
|
((align) ? (MMF_SET_CNTL((mm_flag_t)0, (cntl) | MMF_REQUEST_ALIGN) | \
|
||
|
|
MMF_SET_ALIGN((mm_flag_t)0, (align))) \
|
||
|
|
: (MMF_SET_CNTL((mm_flag_t)0, (cntl) & ~MMF_REQUEST_ALIGN)))
|
||
|
|
|
||
|
|
#undef _DEF_FLAG
|
||
|
|
#endif /* __MM_FLAG_H__ */
|