arch/x86_64/paging.h


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#ifndef JOVE_ARCH_x86_64_PAGING_H
#define JOVE_ARCH_x86_64_PAGING_H 1

#include <stdint.h>
#include "mem/memory.h"

union PageEntry
{
    struct {
        uint8_t p : 1; /* Present */
        uint8_t rw : 1; /* Read/write. 0 for RO.*/
        uint8_t us : 1; /* User/supervisor. 0 for DPL3 forbid */
        uint8_t pwt : 1;
        uint8_t pcd : 1;
        uint8_t a : 1; /* Accessed */
        uint8_t d : 1; /* Dirty */
        uint8_t ps_pat : 1;
        uint8_t g : 1; /* Global */
        uint8_t _r0 : 2;
        uint8_t r : 1;
        uint64_t paddr : 35;
        uint8_t _r1;
        uint8_t pk : 4;
        uint8_t xd : 1;
    }__attribute__((packed));
    uint64_t value;
}__attribute__((packed));

struct PageDirectory
{
    union PageEntry *pml4_vaddr;
    physptr_t pml4_paddr;
    size_t references;
};

extern struct PageDirectory *mem_current_pd;

void mem_pd_new(struct PageDirectory *pd);
void mem_pd_clone(struct PageDirectory *pd, struct PageDirectory *parent);

void mem_pd_ensure_4k(struct PageDirectory *pd, uintptr_t virt, uint8_t flg);
void mem_pd_ensure_range(struct PageDirectory *pd, uintptr_t from, uintptr_t to, uint8_t flg);

#endif