X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Finit.c;h=855afa0340fcb66788aa03a00cc70666b17bbbae;hb=3fb471cc28899036990751f18e2ccb83bf897411;hp=203b79dff7fca5b4a51bbe6b43c9f8e2a6028fe8;hpb=c00124df280431bb3f1fd26ef0f5c863365c6474;p=pintos-anon

diff --git a/src/threads/init.c b/src/threads/init.c
index 203b79d..855afa0 100644
--- a/src/threads/init.c
+++ b/src/threads/init.c
@@ -17,11 +17,11 @@
 #include "threads/loader.h"
 #include "threads/malloc.h"
 #include "threads/mmu.h"
-#include "threads/paging.h"
 #include "threads/palloc.h"
 #include "threads/test.h"
 #include "threads/thread.h"
 #ifdef USERPROG
+#include "userprog/process.h"
 #include "userprog/exception.h"
 #include "userprog/gdt.h"
 #include "userprog/syscall.h"
@@ -36,22 +36,25 @@
 /* Amount of physical memory, in 4 kB pages. */
 size_t ram_pages;
 
+/* Page directory with kernel mappings only. */
+uint32_t *base_page_dir;
+
 #ifdef FILESYS
-/* Format the filesystem? */
+/* -f: Format the filesystem? */
 static bool format_filesys;
 #endif
 
 #ifdef USERPROG
-/* Initial program to run. */
+/* -ex: Initial program to run. */
 static char *initial_program;
 #endif
 
-/* Power off after running requested actions? */
-static bool power_off;
+/* -q: Power off after running requested actions? */
+static bool do_power_off;
 
 static void ram_init (void);
+static void paging_init (void);
 static void argv_init (void);
-static void do_power_off (void);
 
 int main (void) NO_RETURN;
 
@@ -109,15 +112,20 @@ main (void)
   /* Run a user program. */
   if (initial_program != NULL)
     {
+      tid_t tid;
       printf ("\nExecuting '%s':\n", initial_program);
-      thread_execute (initial_program); 
+      tid = process_execute (initial_program);
+#ifdef THREAD_JOIN_IMPLEMENTED
+      if (tid != TID_ERROR)
+        thread_join (tid);
+#endif
     }
 #else
   test ();
 #endif
 
-  if (power_off) 
-    do_power_off ();
+  if (do_power_off) 
+    power_off ();
 
   /* Terminate this thread. */
   thread_exit ();
@@ -140,6 +148,42 @@ ram_init (void)
   ram_pages = *(uint32_t *) ptov (LOADER_RAM_PAGES);
 }
 
+/* Populates the base page directory and page table with the
+   kernel virtual mapping, and then sets up the CPU to use the
+   new page directory.  Points base_page_dir to the page
+   directory it creates.
+
+   At the time this function is called, the active page table
+   (set up by loader.S) only maps the first 4 MB of RAM, so we
+   should not try to use extravagant amounts of memory.
+   Fortunately, there is no need to do so. */
+static void
+paging_init (void)
+{
+  uint32_t *pd, *pt;
+  size_t page;
+
+  pd = base_page_dir = palloc_get (PAL_ASSERT | PAL_ZERO);
+  pt = NULL;
+  for (page = 0; page < ram_pages; page++) 
+    {
+      uintptr_t paddr = page * PGSIZE;
+      void *vaddr = ptov (paddr);
+      size_t pde_idx = pd_no (vaddr);
+      size_t pte_idx = pt_no (vaddr);
+
+      if (pd[pde_idx] == 0)
+        {
+          pt = palloc_get (PAL_ASSERT | PAL_ZERO);
+          pd[pde_idx] = pde_create (pt);
+        }
+
+      pt[pte_idx] = pte_create_kernel (vaddr, true);
+    }
+
+  asm volatile ("movl %0,%%cr3" :: "r" (vtop (base_page_dir)));
+}
+
 /* Parses the command line. */
 static void
 argv_init (void) 
@@ -152,14 +196,17 @@ argv_init (void)
   /* The command line is made up of null terminated strings
      followed by an empty string.  Break it up into words. */
   cmd_line = pos = ptov (LOADER_CMD_LINE);
+  printf ("Kernel command line:");
   while (pos < cmd_line + LOADER_CMD_LINE_LEN)
     {
       ASSERT (argc < LOADER_CMD_LINE_LEN / 2);
       if (*pos == '\0')
         break;
       argv[argc++] = pos;
+      printf (" %s", pos);
       pos = strchr (pos, '\0') + 1;
     }
+  printf ("\n");
   argv[argc] = "";
   argv[argc + 1] = "";
 
@@ -170,7 +217,7 @@ argv_init (void)
     else if (!strcmp (argv[i], "-d")) 
       debug_enable (argv[++i]);
     else if (!strcmp (argv[i], "-q"))
-      power_off = true;
+      do_power_off = true;
 #ifdef USERPROG
     else if (!strcmp (argv[i], "-ex")) 
       initial_program = argv[++i];
@@ -215,14 +262,18 @@ argv_init (void)
           " -D                  Dump complete filesystem contents\n"
 #endif
           " -q                  Power off after doing requested actions.\n"
+          " -u                  Print this help message and power off.\n"
           );
+        power_off ();
       }
     else 
-      PANIC ("unknown option `%s'", argv[i]);
+      PANIC ("unknown option `%s' (use -u for help)", argv[i]);
 }
 
+/* Powers down the machine we're running on,
+   as long as we're running on Bochs or qemu. */
 void
-do_power_off (void) 
+power_off (void) 
 {
   const char s[] = "Shutdown";
   const char *p;
@@ -232,6 +283,8 @@ do_power_off (void)
 #endif
 
   printf ("Powering off...\n");
+  serial_flush ();
+
   for (p = s; *p != '\0'; p++)
     outb (0x8900, *p);
   for (;;);