/* An actual memory access based on the vaddr from the trace file.
*
* The find_physpage() function is called to translate the virtual address
* to a (simulated) physical address -- that is, a pointer to the right
* location in physmem array. The find_physpage() function is responsible for
* everything to do with memory management - including translation using the
* pagetable, allocating a frame of (simulated) physical memory (if needed),
* evicting an existing page from the frame (if needed) and reading the page
* in from swap (if needed).
*
* We then check that the memory has the expected content (just a copy of the
* virtual address) and, in case of a write reference, increment the version
* counter.
*/
void access_mem(char type, addr_t vaddr) {
char *memptr = find_physpage(vaddr, type);
int *versionptr = (int *)memptr;
addr_t *checkaddr = (addr_t *)(memptr + sizeof(int));
if (*checkaddr != vaddr) {
fprintf(stderr,"Error, simulated page returned by pagetable lookup does "
"not have expected value.\n");
}
if (type == 'S' || type == 'M') {
// write access to page, increment version number
(*versionptr)++;
}
}
/* An actual memory access based on the vaddr from the trace file.
*
* The find_physpage() function is called to translate the virtual address
* to a (simulated) physical address -- that is, a pointer to the right
* location in physmem array. The find_physpage() function is responsible for
* everything to do with memory management - including translation using the
* pagetable, allocating a frame of (simulated) physical memory (if needed),
* evicting an existing page from the frame (if needed) and reading the page
* in from swap (if needed).
*
* We then check that the memory has the expected content (just a copy of the
* virtual address) and, in case of a write reference, increment the version
* counter.
*/
void access_mem(char type, addr_t vaddr) {
//printf("DEBUG: from access_mem");
char *memptr = find_physpage(vaddr, type);
int *versionptr = (int *)memptr;
addr_t *checkaddr = (addr_t *)(memptr + sizeof(int));
line++;
printf("line: %d , *checkaddr: %lx , vaddr: %lx\n",line, *checkaddr, vaddr );
if (*checkaddr != vaddr) {
fprintf(stderr,"Error, simulated page returned by pagetable lookup doese not have expected value.\n");
}
else printf("MATCH! simulated page has expected value!\n");
if (type == 'S' || type == 'M') {
// write access to page, increment version number
(*versionptr)++;
}
}