/*
* void init_paging()
* Description: Initializes page directories, tables and control registers
* Inputs: none
* Return Value: none
*/
void init_paging()
{
// Set up program page (physical) address array
uint32_t i;
for(i = 0; i < NUM_PD; i++)
{
PGRM_PAGE[i] = PAGE1 + i * PAGE_SIZE;
}
// Initialize the Page directory
init_PD();
// Initialize the video page table
init_VIDEO_PT();
// Set PSE bit in CR4
set_PSE();
// Set PG bit in CR0
set_PG();
// Set PGE bit in CR4
set_PGE();
INVLPG(VIDEO_MEM);
INVLPG(KERNEL_MEM);
//test_paging();
}
int main(int argc, char *argv[]){
FILE *fp; // stimulus file handle
char filename[50] = "stim.txt"; // stimulus file name, can be overwritten on cmdline
// if filename given on commandline use it otherwise use default filename
if (argc == 2) {strcpy(filename, argv[1]);}
else {strcpy(filename, "stim.txt");}
int opt = 0;
// parse the cmdline
while ((opt = getopt(argc, argv, "i:p:")) != -1) {
switch(opt) {
case 'i': strcpy(filename, optarg); break;
case 'p': available_pf = (u32) strtol(optarg,NULL,10);
validate_pf_number(available_pf);
break;
case '?':
if (optopt == 'i'){
printf("USAGE: -i <filename>\n\n");
return -1;
} else if (optopt == 'p') {
printf("USAGE: -p <numpages>\n\n");
return -1;
} else {
printf("Valid switches are:\n");
printf("\t -i <input_filename>\n\t -p <numpages>\n\n");
return -1;
break;
}
}
}
// open the input file
fp = fopen (filename,"r");
if (NULL == fp){
fprintf (stderr, "Failed to open input file. This is fatal!\n");
exit(0);
}
//call function to allocate memory to PD
init_PD();
// loop through input file an feed commands to sim
do {
get_command(fp);
if (strcmp(cmd, "-v") == MATCH) {
printf("VMM Simulator Ver 0.1\n");
exit(-1);
}
else if (strcmp(cmd, "w") == MATCH || strcmp(cmd, "r") == MATCH ) {
// update read/wrote/access statistics
num_accesses ++;
if (strcmp(cmd, "w") == MATCH) {num_writes ++;}
else {num_reads ++;}
parse_addr(addr);
if ( t_flag == 1 ){
printf(" %s 0x%08X\n", cmd, addr);
}
if (is_PT_present(working_addr.PD_index) == 1) {
//check the user page present
if(is_UP_present(working_addr.PD_index, working_addr.PT_index) == 1)
{
total_cycles += 20; //if the address exist, it considers memory access
//printf("get here few time\n");
}
else //the PT exists but not the user page
{
if (available_pf == used_pf) // no pf avail then evict one page
evict_page();
create_user_page(working_addr.PD_index, working_addr.PT_index,cmd);
}
}
else // new PT and UP need to created
{
while (available_pf < (used_pf + 2)) // create 2 avail pf
evict_page();
create_page_table(working_addr.PD_index, cmd);
create_user_page(working_addr.PD_index, working_addr.PT_index, cmd);
}
}
if (d_flag == 1){dump_vmm();}
} while (strcmp (cmd, "EOF"));
num_physical_frames = 1 + num_PT + num_UP;
print_outputs();
}
