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

/*   The VM system is composed of three segments:
 *     text, data, and stack 
 *
 *   Before execution of the program starts, mipsi calls mt_vm_initialize 
 *   with the range of addresses that are valid for the text, data, 
 *   and stack segments.  Any virtual address needs to be in the
 *   ranges specified by this call.  Any virtual address outside these
 *   ranges can be considered an invalid address.  Accesses to invalid
 *   addresses should cause the system to print out an error message
 *   and die.
 */

/* initialize the segments for the VM system */
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.
 *   If a page fault occurs, handle it.
 */
PTE mt_tlb_translate_fault(unsigned long vpage)
{
    unsigned flags,ppage;
    /* body goes here */

    return TLB_MAKE_PTE(ppage,flags);
}

/*   A write fault occured at this virtual page. The expected return
 *   value is a new value for the protection flags for this virtual
 *   page.
 */
unsigned long mt_tlb_write_fault(unsigned long vpage)
{
     unsigned flags;
     /* body goes here */

     return flags;
}