82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
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/*
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* Copyright (c) 2006-2019, 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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* 2019-11-01 Jesven The first version
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* 2022-12-13 WangXiaoyao Hot-pluggable, extensible
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* page management algorithm
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*/
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#ifndef __MM_PAGE_H__
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#define __MM_PAGE_H__
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#include <rthw.h>
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#include <rtthread.h>
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#include <stdint.h>
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#define GET_FLOOR(type) \
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(1ul << (8 * sizeof(rt_size_t) - __builtin_clzl(2 * sizeof(type) - 1) - 1))
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#define DEF_PAGE_T(fields) \
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typedef struct rt_page {\
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union {struct {fields}; char _padding[GET_FLOOR(struct {fields})];};\
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} *rt_page_t
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DEF_PAGE_T(
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struct rt_page *next; /* same level next */
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struct rt_page *pre; /* same level pre */
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rt_uint32_t size_bits; /* if is ARCH_ADDRESS_WIDTH_BITS, means not free */
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rt_uint32_t ref_cnt; /* page group ref count */
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);
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#undef GET_FLOOR
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#undef DEF_PAGE_T
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typedef struct tag_region
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{
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rt_size_t start;
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rt_size_t end;
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} rt_region_t;
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extern const rt_size_t rt_mpr_size;
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extern void *rt_mpr_start;
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void rt_page_init(rt_region_t reg);
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void rt_page_cleanup(void);
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void *rt_pages_alloc(rt_uint32_t size_bits);
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void rt_page_ref_inc(void *addr, rt_uint32_t size_bits);
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int rt_page_ref_get(void *addr, rt_uint32_t size_bits);
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int rt_pages_free(void *addr, rt_uint32_t size_bits);
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void rt_page_list(void);
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rt_size_t rt_page_bits(rt_size_t size);
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void rt_page_get_info(rt_size_t *total_nr, rt_size_t *free_nr);
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void *rt_page_page2addr(struct rt_page *p);
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struct rt_page *rt_page_addr2page(void *addr);
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/**
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* @brief Install page frames at run-time
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* Region size must be aligned to 2^(RT_PAGE_MAX_ORDER + ARCH_PAGE_SHIFT - 1)
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* bytes currently (typically 2 MB).
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*
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* !WARNING this API will NOT check whether region is valid or not in list
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*
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* @param region region.start as first page frame(inclusive),
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* region.end as first page frame after free region
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* @return int 0 on success
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*/
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int rt_page_install(rt_region_t region);
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#endif /* __MM_PAGE_H__ */
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