virt_mem_manager.h

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#ifndef _VIRT_MEM_MAN_H_
#define _VIRT_MEM_MAN_H_

#include "types.h"

#define PAGE_DIR_STORAGE_POOL_SIZE MB(18)
#define MEMIO_TOP_BASE 0xF0000000
#define VIRTUALIZE_HIGHER_MEM_OFFSET(a) (((uint32_t)a - 0xF0000000) + 0x10000000)

typedef enum
{
    MEM_TYPE_UC = 2,
    MEM_TYPE_WB = 0,
    MEM_TYPE_WT = 1,
    MEM_TYPE_WC = 3
} MEM_TYPES;

typedef enum
{
    MEM_WRITE = 2,
    MEM_READ = 4,
    MEM_EXEC = 1
} MEM_ACCESS_PERMS;

typedef enum
{
    MEM_KERNEL = 0,
    MEM_USER = 1
} MEM_SECURITY_PERMS;

typedef uint64_t* VirtMemMan_Instance;

void 
virtMemMan_Setup(void);

VirtMemMan_Instance 
virtMemMan_SetCurrent(VirtMemMan_Instance instance);

VirtMemMan_Instance 
virtMemMan_GetCurrent(void);

VirtMemMan_Instance 
virtMemMan_CreateInstance(void);

void 
virtMemMan_Fork(VirtMemMan_Instance dst, 
                VirtMemMan_Instance src);

void 
virtMemMan_ForkCurrent(VirtMemMan_Instance dst);

void* 
virtMemMan_FindEmptyAddress(size_t size, 
                            MEM_SECURITY_PERMS privLevel);

uint32_t 
virtMemMan_Map(uint32_t v_address, 
               uint64_t phys_address, 
               size_t size, 
               MEM_TYPES type, 
               MEM_ACCESS_PERMS perms, 
               MEM_SECURITY_PERMS privLevel);

void 
virtMemMan_UnMap(void* v_address, 
                 size_t size);

void 
virtMemMan_FreeInstance(VirtMemMan_Instance inst);

uint64_t 
virtMemMan_GetPhysAddress(void *virt_addr);

uint64_t 
virtMemMan_GetPhysAddressInst(VirtMemMan_Instance curInstance_virt, 
                              void *virt_addr);

void* 
virtMemMan_FindEmptyAddressInst(VirtMemMan_Instance curInstance_virt, 
                                size_t size, 
                                MEM_SECURITY_PERMS privLevel);

uint32_t 
virtMemMan_MapInst(VirtMemMan_Instance curInstance_virt, 
                   uint32_t v_address, 
                   uint64_t phys_address, 
                   size_t size, 
                   MEM_TYPES type, 
                   MEM_ACCESS_PERMS perms, 
                   MEM_SECURITY_PERMS privLevel);

void 
virtMemMan_UnMapInst(VirtMemMan_Instance curInstance_virt, 
                     void* v_address, 
                     size_t size);

#endif /* end of include guard: _VIRT_MEM_MAN_H_ */