#ifndef __MT_VM_H__
#define __MT_VM_H__

#include "main.h"
#include "tlb.h"


/* 
 * Default values for where the TEXT, STACK, and DATA segments start. 
 *
 * These are the values that are normally used for Ultrix.  We use them
 *   too because we compile Ultrix code.
 * 
 * Have to give the end value for the stack (instead of the start) 
 *   because it grows down. 
 */ 

#define TEXT_START   0x00400000
#define DATA_START   0x10000000
#define STACK_END    0x80000000

/* maximum size of memory */
#define MAX_MEMORY_SIZE (16*1024*1024)

/* 
 * Initialize the segments for the VM system.  
 *
 * Assume that the addresses are aligned on page boundaries.  
 *
 * Valid virtual addresses are for addresses that:
 *     min_addr <= addr < max_addr  
 * 
 */
void mt_vm_initialize(unsigned min_text_addr, unsigned max_text_addr,
		      unsigned min_stack_addr, unsigned max_stack_addr,
		      unsigned min_data_addr,  unsigned max_data_addr);


/* convert the virtual page to a physical page and set the flags */
PTE mt_tlb_translate_fault(unsigned long vpage);

/*  write fault occured at this virtual page, expected return
 *  value is a new value for the protection flags for this virtual
 *    page
 */
unsigned long mt_tlb_write_fault(unsigned long vpage);

#endif __MT_VM_H__