96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
#ifndef __PAGING_H__
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#define __PAGING_H__
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#include "types.h"
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// Some helpful macros
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#define PAGING_GET_ML4_INDEX(x) (((u64)x >> 39) & 0x1FF)
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#define PAGING_GET_DPT_INDEX(x) (((u64)x >> 30) & 0x1FF)
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#define PAGING_GET_DIR_INDEX(x) (((u64)x >> 21) & 0x1FF)
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#define PAGING_GET_TAB_INDEX(x) (((u64)x >> 12) & 0x1FF)
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#define PAGING_GET_PAGE_OFFSET(x) (x & 0xFFF)
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// Intel-defined entries - strict!
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struct S_PAGING_TAB_ENTRY {
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u8 Present : 1;
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u8 RW : 1;
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u8 User : 1;
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u8 Accessed : 1;
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u8 Misc : 8;
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u64 Physical : 40; // The physical address is limited by MAXPHYADDR
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u16 Zero : 12;
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} __attribute__((packed));
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typedef struct S_PAGING_TAB_ENTRY T_PAGING_TAB_ENTRY;
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struct S_PAGING_DIR_ENTRY {
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u8 Present : 1;
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u8 RW : 1;
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u8 User : 1;
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u8 Accessed : 1;
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u8 Misc : 8;
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u64 Physical : 40; // The physical address is limited by MAXPHYADDR
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u64 Zero : 12;
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} __attribute__((packed));
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typedef struct S_PAGING_DIR_ENTRY T_PAGING_DIR_ENTRY;
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struct S_PAGING_DPT_ENTRY {
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u8 Present : 1;
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u8 RW : 1;
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u8 User : 1;
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u8 Accessed : 1;
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u8 Misc : 8;
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u64 Physical : 40; // The physical address is limited by MAXPHYADDR
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u64 Zero : 12;
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} __attribute__((packed));
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typedef struct S_PAGING_DPT_ENTRY T_PAGING_DPT_ENTRY;
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struct S_PAGING_ML4_ENTRY {
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u8 Present : 1;
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u8 RW : 1;
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u8 User : 1;
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u8 Accessed : 1;
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u8 Misc : 8;
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u64 Physical : 40; // The physical address is limited by MAXPHYADDR
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u64 Zero : 12;
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} __attribute__((packed));
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typedef struct S_PAGING_ML4_ENTRY T_PAGING_ML4_ENTRY;
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// OS-defined structures - semi-loose.
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typedef struct {
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T_PAGING_TAB_ENTRY Entries[512];
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u64 PhysicalAddress;
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} T_PAGING_TAB;
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typedef struct {
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T_PAGING_DIR_ENTRY Entries[512]; // For use by CPU
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T_PAGING_TAB *Children[512]; // For use by OS
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u64 PhysicalAddress; // FOr use by OS when setting CPU
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} T_PAGING_DIR;
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typedef struct {
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T_PAGING_DPT_ENTRY Entries[512];
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T_PAGING_DIR *Children[512];
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u64 PhysicalAddress;
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} T_PAGING_DPT;
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typedef struct {
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T_PAGING_ML4_ENTRY Entries[512];
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T_PAGING_DPT *Children[512];
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u64 PhysicalAddress;
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} T_PAGING_ML4;
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void paging_init_simple(u64 PhysicalVirtualOffset);
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T_PAGING_ML4 * paging_get_ml4(void);
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u8 paging_get_physical(u64 Virtual, u64 *Physical);
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u8 paging_get_physical_ex(u64 Virtual, u64 *Physical,T_PAGING_ML4 *ML4);
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/*void paging_map_kernel_page(u64 Virtual, u64 Physical);
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void paging_map_kernel_table(u64 Virtual, u64 Physical);
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void paging_map_page(u64 Virtual, u64 Physical, T_PAGING_DIRECTORY *Directory,
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u8 User, u8 RW);
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void paging_use_directory(T_PAGING_DIRECTORY *Directory);
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T_PAGING_DIRECTORY *paging_get_directory(void);*/
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#endif
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