X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Finit.c;h=741f0e42e4339b8824f16646aae237de0f365dc0;hb=5f1b986185717577aac1922544cb3a7b1a56b632;hp=9774493d9e31f8af5687d421d3f0d987e17f389f;hpb=838c30d0075a3ee0413ba4909944b37f4970a10d;p=pintos-anon

diff --git a/src/threads/init.c b/src/threads/init.c
index 9774493..741f0e4 100644
--- a/src/threads/init.c
+++ b/src/threads/init.c
@@ -49,8 +49,8 @@ static bool format_filesys;
 static char *initial_program;
 #endif
 
-/* -q: Power off after running requested actions? */
-static bool do_power_off;
+/* -q: Power off after kernel tasks complete? */
+bool power_off_when_done;
 
 static void ram_init (void);
 static void paging_init (void);
@@ -62,27 +62,33 @@ int main (void) NO_RETURN;
 int
 main (void)
 {
-  /* Initialize everything needed for printf() first. */
+  /* Clear BSS and get machine's RAM size. */  
   ram_init ();
+
+  /* Initialize ourselves as a thread so we can use locks. */
   thread_init ();
+
+  /* Initialize the console so we can use printf(). */
   vga_init ();
   serial_init_poll ();
   console_init ();
 
   /* Greet user. */
-  printf ("Pintos booting with %'zd kB RAM...\n", ram_pages * (PGSIZE / 1024));
+  printf ("Pintos booting with %'zu kB RAM...\n", ram_pages * PGSIZE / 1024);
 
   /* Parse command line. */
   argv_init ();
 
-  /* Initialize memory system, segments, paging. */
+  /* Initialize memory system. */
   palloc_init ();
+  malloc_init ();
   paging_init ();
+
+  /* Segmentation. */
 #ifdef USERPROG
   tss_init ();
   gdt_init ();
 #endif
-  malloc_init ();
 
   /* Set random seed if argv_init() didn't. */
   random_init (0);
@@ -122,14 +128,15 @@ main (void)
 #endif
     }
 #else
+  /* Run the compiled-in test function. */
   test ();
 #endif
 
-  if (do_power_off) 
+  /* Finish up. */
+  if (power_off_when_done) 
     power_off ();
-
-  /* Terminate this thread. */
-  thread_exit ();
+  else 
+    thread_exit ();
 }
 
 /* Clear BSS and obtain RAM size from loader. */
@@ -218,13 +225,15 @@ argv_init (void)
     else if (!strcmp (argv[i], "-d")) 
       debug_enable (argv[++i]);
     else if (!strcmp (argv[i], "-q"))
-      do_power_off = true;
+      power_off_when_done = true;
 #ifdef USERPROG
     else if (!strcmp (argv[i], "-ex")) 
       initial_program = argv[++i];
+    else if (!strcmp (argv[i], "-ul"))
+      user_page_limit = atoi (argv[++i]);
 #endif
 #ifdef FILESYS
-  else if (!strcmp (argv[i], "-f"))
+    else if (!strcmp (argv[i], "-f"))
       format_filesys = true;
     else if (!strcmp (argv[i], "-ci")) 
       {
@@ -250,6 +259,7 @@ argv_init (void)
           " -d CLASS[,...]      Enable the given classes of debug messages.\n"
 #ifdef USERPROG
           " -ex 'PROG [ARG...]' Run PROG, passing the optional arguments.\n"
+          " -ul USER_MAX        Limit user memory to USER_MAX pages.\n"
 #endif
 #ifdef FILESYS
           " -f                  Format the filesystem disk (hdb or hd0:1).\n"