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