#ifndef _MMNGR_PHYS_H
#define _MMNGR_PHYS_H

#define pmmngr_load_PDBR(addr) write_cr3(addr)
#define pmmngr_get_PDBR() read_cr3()

// physical address
typedef unsigned physical_addr;

struct memory_stack_entry{
      unsigned short low;
      unsigned char high;
} __attribute__ ((__packed__));
typedef struct memory_stack_entry mstack;

// CR registers r/w operations
extern unsigned read_cr0();
extern unsigned read_cr3();
extern void write_cr0(unsigned data);
extern void write_cr3(unsigned data);

// Free/Alloc memory block(s)
extern void pmmngr_free_block(void* address);
extern void pmmngr_free_blocks(unsigned base, unsigned size);
extern void* pmmngr_alloc_block ();
extern void* pmmngr_alloc_blocks (unsigned blocks);

// De/Initialisation routines
extern void pmmngr_init (unsigned memSize, unsigned stack);
extern void pmmngr_init_region (unsigned base, unsigned size);
extern void pmmngr_deinit_region (unsigned base, unsigned size);

// Useful information
extern unsigned pmmngr_get_memory_size (); // returns amount of physical memory the manager is set to use
extern unsigned pmmngr_get_use_block_count (); // returns number of blocks currently in use
extern unsigned pmmngr_get_free_block_count (); // returns number of blocks not in use
extern unsigned pmmngr_get_block_count (); // returns number of memory blocks
extern unsigned pmmngr_get_block_size (); // returns default memory block size in unsigned chars
extern unsigned char pmmngr_test_block (unsigned block);

// Paging
extern void pmmngr_paging_enable (unsigned char b); // enable or disable paging
extern unsigned char pmmngr_is_paging (); // test if paging is enabled

extern void print_stack();

#endif