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/*
* Copyright (c) 2006-2019, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-11-01 Jesven The first version
* 2022-12-13 WangXiaoyao Hot-pluggable, extensible
* page management algorithm
*/
#ifndef __MM_PAGE_H__
#define __MM_PAGE_H__
#include <rthw.h>
#include <rtthread.h>
#include <stdint.h>
#define GET_FLOOR(type) \
(1ul << (8 * sizeof(rt_size_t) - __builtin_clzl(2 * sizeof(type) - 1) - 1))
#define DEF_PAGE_T(fields) \
typedef struct rt_page {\
union {struct {fields}; char _padding[GET_FLOOR(struct {fields})];};\
} *rt_page_t
DEF_PAGE_T(
struct rt_page *next; /* same level next */
struct rt_page *pre; /* same level pre */
rt_uint32_t size_bits; /* if is ARCH_ADDRESS_WIDTH_BITS, means not free */
rt_uint32_t ref_cnt; /* page group ref count */
);
#undef GET_FLOOR
#undef DEF_PAGE_T
typedef struct tag_region
{
rt_size_t start;
rt_size_t end;
} rt_region_t;
extern const rt_size_t rt_mpr_size;
extern void *rt_mpr_start;
void rt_page_init(rt_region_t reg);
void rt_page_cleanup(void);
void *rt_pages_alloc(rt_uint32_t size_bits);
void rt_page_ref_inc(void *addr, rt_uint32_t size_bits);
int rt_page_ref_get(void *addr, rt_uint32_t size_bits);
int rt_pages_free(void *addr, rt_uint32_t size_bits);
void rt_page_list(void);
rt_size_t rt_page_bits(rt_size_t size);
void rt_page_get_info(rt_size_t *total_nr, rt_size_t *free_nr);
void *rt_page_page2addr(struct rt_page *p);
struct rt_page *rt_page_addr2page(void *addr);
/**
* @brief Install page frames at run-time
* Region size must be aligned to 2^(RT_PAGE_MAX_ORDER + ARCH_PAGE_SHIFT - 1)
* bytes currently (typically 2 MB).
*
* !WARNING this API will NOT check whether region is valid or not in list
*
* @param region region.start as first page frame(inclusive),
* region.end as first page frame after free region
* @return int 0 on success
*/
int rt_page_install(rt_region_t region);
#endif /* __MM_PAGE_H__ */
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