pmap.h

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#ifndef __PMAP_H__
#define __PMAP_H__
 
#include <machine/amd64.h>
 
/*
 * +----------------------+
 * | Zero Page (Unmapped) |
 * +----------------------+ 0x00000000_00000100 User Space Start
 * |                      |
 * | User Space           |
 *            .
 *            .
 *            .
 * |                      |
 * +----------------------+ 0x00008000_00000000 User Space End
 * |                      |
 * | Non-canonical        |
 *            .
 *            .
 *            .
 * |                      |
 * +----------------------+ 0xFFFF8000_00000000 Direct Map
 * | Direct Map           |
 * +----------------------+ 0xFFFF8100_00000000 XMap Start
 * | XMap                 |
 * +----------------------+ 0xFFFF8120_00000000 XMap Top
 *
 *
 */
#define MEM_USERSPACE_BASE      0x0000000000000000ULL
#define MEM_USERSPACE_LEN       0x0000800000000000ULL
#define MEM_USERSPACE_TOP       (MEM_USERSPACE_BASE + MEM_USERSPACE_LEN)
 
#define MEM_USERSPACE_STKBASE   0x0000000070000000ULL
#define MEM_USERSPACE_STKLEN    0x0000000000010000ULL
#define MEM_USERSPACE_STKTOP    (MEM_USERSPACE_STKBASE + MEM_USERSPACE_STKLEN)
 
#define MEM_DIRECTMAP_BASE      0xFFFF800000000000ULL
#define MEM_DIRECTMAP_LEN       0x0000010000000000ULL
#define MEM_XMAP_BASE           0xFFFF810000000000ULL
#define MEM_XMAP_LEN            0x0000002000000000ULL
 
#define PPN2DMVA(ppn)           (((ppn) << PGSIZE) + MEM_DIRECTMAP_BASE)
#define DMVA2PPN(dmva)          (((dmva) - MEM_DIRECTMAP_BASE) >> PGSIZE)
#define DMVA2PA(dmva)           ((dmva) - MEM_DIRECTMAP_BASE)
#define DMPA2VA(pa)             ((pa) + MEM_DIRECTMAP_BASE)
#define VA2PA(va)               PMap_Translate(PMap_CurrentAS(), va)
 
typedef struct AS
{
    PageTable   *root;
    uint64_t    tables;
    uint64_t    mappings;
} AS;
 
void PMap_Init();
void PMap_InitAP();
 
AS* PMap_NewAS();
void PMap_DestroyAS(AS *space);
AS* PMap_CurrentAS();
void PMap_LoadAS(AS *space);
void PMap_Dump(AS *space);
 
uintptr_t PMap_Translate(AS *space, uintptr_t va);
 
// Manipulate User Memory
bool PMap_Map(AS *as, uint64_t phys, uint64_t virt, uint64_t pages, uint64_t flags);
bool PMap_AllocMap(AS *as, uint64_t virt, uint64_t len, uint64_t flags);
bool PMap_Unmap(AS *as, uint64_t virt, uint64_t pages);
 
// Manipulate Kernel Memory
void PMap_SystemLookup(uint64_t va, PageEntry **entry, int size);
bool PMap_SystemLMap(uint64_t phys, uint64_t virt, uint64_t lpages, uint64_t flags);
bool PMap_SystemMap(uint64_t phys, uint64_t virt, uint64_t pages, uint64_t flags);
bool PMap_SystemUnmap(uint64_t virt, uint64_t pages);
 
#endif /* __PMAP_H__ */