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// MIT License, Copyright (c) 2021 Marvin Borner
#ifndef PAGING_H
#define PAGING_H
#include <boot.h>
#include <def.h>
/**
* Physical
*/
/**
* Virtual
*/
#define PAGE_SIZE 0x1000
#define PAGE_COUNT 1024
#define PAGE_ALIGN(x) ((x) + PAGE_SIZE - ((x) % PAGE_SIZE))
#define PAGE_ALIGNED(x) ((x) % PAGE_SIZE == 0)
union page_table_entry {
struct PACKED {
u32 present : 1;
u32 writable : 1;
u32 user : 1;
u32 write_through : 1;
u32 cache_disable : 1;
u32 accessed : 1;
u32 dirty : 1;
u32 attribute : 1;
u32 global : 1;
u32 available : 3;
u32 address : 20;
} bits;
u32 uint;
} PACKED;
struct page_table {
union page_table_entry entries[PAGE_COUNT];
} PACKED;
union page_dir_entry {
struct PACKED {
u32 present : 1;
u32 writable : 1;
u32 user : 1;
u32 write_through : 1;
u32 cache_disable : 1;
u32 accessed : 1;
u32 reserved : 1;
u32 page_size : 1;
u32 global : 1;
u32 available : 3;
u32 address : 20;
} bits;
u32 uint;
} PACKED;
struct page_dir {
union page_dir_entry entries[PAGE_COUNT];
} PACKED;
void paging_install(struct mem_info *mem_info);
/**
* Memory wrappers
*/
#define MEMORY_NONE (0 << 0)
#define MEMORY_USER (1 << 0)
#define MEMORY_CLEAR (1 << 1)
#define memory_range(base, size) ((struct memory_range){ (base), (size) })
struct memory_range {
u32 base;
u32 size;
};
#endif
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