X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Finit.c;h=b4b1057eb750fd290d7a02adbc752c073db7a210;hb=6070611faac84bdf95c4405b3970c6928202f26b;hp=741f0e42e4339b8824f16646aae237de0f365dc0;hpb=5f1b986185717577aac1922544cb3a7b1a56b632;p=pintos-anon

diff --git a/src/threads/init.c b/src/threads/init.c
index 741f0e4..b4b1057 100644
--- a/src/threads/init.c
+++ b/src/threads/init.c
@@ -105,6 +105,7 @@ main (void)
   /* Start thread scheduler and enable interrupts. */
   thread_start ();
   serial_init_queue ();
+  timer_calibrate ();
 
 #ifdef FILESYS
   /* Initialize filesystem. */
@@ -122,10 +123,8 @@ main (void)
       tid_t tid;
       printf ("\nExecuting '%s':\n", initial_program);
       tid = process_execute (initial_program);
-#ifdef THREAD_JOIN_IMPLEMENTED
       if (tid != TID_ERROR)
         thread_join (tid);
-#endif
     }
 #else
   /* Run the compiled-in test function. */
@@ -189,7 +188,11 @@ paging_init (void)
       pt[pte_idx] = pte_create_kernel (vaddr, true);
     }
 
-  asm volatile ("movl %0,%%cr3" :: "r" (vtop (base_page_dir)));
+  /* Store the physical address of the page directory into CR3
+     aka PDBR (page directory base register).  This activates our
+     new page tables immediately.  See [IA32-v2a] "MOV--Move
+     to/from Control Registers" and [IA32-v3] 3.7.5. */
+  asm volatile ("mov %%cr3, %0" :: "r" (vtop (base_page_dir)));
 }
 
 /* Parses the command line. */