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#ifndef __MEMORY_H__
#define __MEMORY_H__
#include "types.h"
#include "devices.h"
/* maximum number of pages on the system */
#define PAGES_MAX_COUNT 32
/* in our system there are only 16 pages since only 64KB can be addressed
* to optimize the memory management in ROM and RAM only pages from this set
* shall be used
*/
// ROM
#define ADDR_PAGE_0 0x0000
#define ADDR_PAGE_1 0x1000
#define ADDR_PAGE_2 0x2000
#define ADDR_PAGE_3 0x3000
// IOSPACE
#define ADDR_PAGE_4 0x4000
#define ADDR_PAGE_5 0x5000
#define ADDR_PAGE_6 0x6000
#define ADDR_PAGE_7 0x7000
// RAM
#define ADDR_PAGE_8 0x8000
#define ADDR_PAGE_9 0x9000
#define ADDR_PAGE_10 0xA000
#define ADDR_PAGE_11 0xB000
#define ADDR_PAGE_12 0xC000
#define ADDR_PAGE_13 0xD000
#define ADDR_PAGE_14 0xE000
#define ADDR_PAGE_15 0xF000
struct page
{
uint used :1;
pid_t pid; // process owner of the page
uint16_t addr; // physical address
};
extern struct page pages_table[PAGES_MAX_COUNT];
int mmu_write_table(void);
int page_map(int page, int pid, uint16_t addr);
int page_unmap(int page);
#endif // __MEMORY_H__
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