root/include/pagetab.h

INCLUDED FROM

#ifndef PAGETAB_H
#define PAGETAB_H

#define P       1               // Present(1)
#define RW      2               // Read(0)/Write(1)
#define US      4               // User(1)/Supervisor(0)
#define PWT     8               // Page-Level Writethrough
#define PCD     16              // Page-Level Cache Disable
#define A       32              // Accessed(1)
#define D       64              // Dirty(1)
#define PAT     128             // Page Attribute Table (or sometimes Page Size, but always 0 for our purposes
#define G       256             // Global
#define NX32    0x80000000
#define NX      0x8000000000000 // No execute

#ifdef CODE_32
struct PML4e {
    long Lo:32;
    long Hi:32;
};

struct PDPE {
    long Lo:32;
    long Hi:32;
};

struct PDE {
    long Lo:32;
    long Hi:32;
};

struct PTE {
    long Lo:32;
    long Hi:32;
};
#else
struct PML4e {
    long value;
};

struct PDPE {
    long value;
};

struct PDE {
    long value;
};

struct PTE {
    long value;
};
#endif

struct PML4 {
    struct PML4e entries[64];
};

struct PDP {
    struct PDPE entries[64];
};

struct PD {
    struct PDE entries[64];
};

struct PT {
    struct PTE entries[64];
};

void *AllocPage(unsigned short int pid);
long CreatePTE(void *pAddress, long lAddress, unsigned short pid, short flags);
long AllocAndCreatePTE(long lAddress, unsigned short pid, short flags);
long CreatePTEWithPT(struct PML4 *pml4, void *pAddress, long lAddress,
             unsigned short pid, short flags);
void *VCreatePageDir(unsigned short pid, unsigned short parentPid);
void ClearUserMemory(void);

#endif