more comments and modification

student-distrib/proc.h

@@ -7,9 +7,6 @@
 #include "terminal.h"
 #include "filesys.h"
 
-/* Mask to get 8KB page */
-#define PCB_M           0xFFFFE000
-
 extern int32_t fail(); // Error handling helper function
 extern void control_initilization(void);
 extern void exit(void);

student-distrib/scheduler.c

 #include "scheduler.h"
 
+/* The scheduler function
+ *
+ * DISCRIPTION: This function switch running process every 15 ms
+ *
+ */
 void scheduler(void){
-    
-    //printf("schedule counter = %d\n", ++counter);
+
     // Bookkeeping
     pcb_t * curr_pcb = terminal[running_terminal].pcb;
 
@@ -10,7 +14,7 @@ void scheduler(void){
     {
 
         // initialize pcb and set esp and ebp
-        // scheduler_flag used in execute to override pcb_init ebp and esp 
+        // scheduler_flag used in execute to override pcb_init ebp and esp
         pcb_t pcb;
         pcb.scheduler_flag = 1;
 
@@ -24,8 +28,6 @@ void scheduler(void){
 
         terminal[running_terminal].pcb = &pcb;
 
-        //printf("[SCHEDULE] ebp = %x , esp = %x\n", pcb.current_ebp, pcb.current_esp);
-
         switch_terminal(running_terminal);
 
         printf("terminal = %d\n", running_terminal);
@@ -57,19 +59,12 @@ void scheduler(void){
 
     pcb_t* next_pcb = terminal[running_terminal].pcb;
 
-    //printf("[SCHEDULE] curr_pcb = %x , next_pcb = %x\n", curr_pcb, next_pcb);
-
     // update current pid, tss and remap paging
     remap_proc(next_pcb->pid);
 
     tss.ss0 = KERNEL_DS;
     tss.esp0 = _8_MB - _8_KB * (next_pcb->pid);
 
-    //printf("[SCHEDULE] esp = %x ebp = %x pid = %d pcb = %x\n", next_pcb->current_esp, next_pcb->current_ebp, next_pcb->pid, next_pcb);
-
-    // cli();
-    //while(1);
-
     send_eoi(0);
 
     asm volatile(

student-distrib/scheduler.h

 #include "lib.h"
 #include "types.h"
 #include "x86_desc.h"
-#include "terminal.h"
-#include "syscall.h"
-#include "paging.h"
 
-int32_t remap_proc(int32_t pid);
 
 extern void scheduler(void);
+
+/* function needed from other place */
+int32_t execute (const uint8_t* command);
+
+int32_t switch_terminal(int32_t term_id);
+
+int32_t remap_proc(int32_t pid);
+void remap2(int32_t term_id);
+void remap_vidmem();

student-distrib/syscall.c

@@ -103,7 +103,7 @@ int32_t execute(const uint8_t* command)
     int32_t ret, arg_num; //number that indicated special command
 
     int32_t pid = set_pid();
-    //if( pid == -1) return -1; // reach max process 
+    //if( pid == -1) return -1; // reach max process
 
     ret = parse_cmd(command, parsed_cmd, argv);