X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fdevices%2Fshutdown.c;h=da94c5294f339c1d81eb0950f83e53f9f703b1dc;hb=47747baf50a7db012348a4954b97fc161bcacd19;hp=7ff9a95adbe080893eef291ca96c937afdf8d44b;hpb=a03618133f7df0954802a470a4bee7674f7aed45;p=pintos-anon

diff --git a/src/devices/shutdown.c b/src/devices/shutdown.c
index 7ff9a95..da94c52 100644
--- a/src/devices/shutdown.c
+++ b/src/devices/shutdown.c
@@ -99,11 +99,21 @@ shutdown_power_off (void)
   printf ("Powering off...\n");
   serial_flush ();
 
+  /* ACPI power-off */
+  outw (0xB004, 0x2000);
+
   /* This is a special power-off sequence supported by Bochs and
      QEMU, but not by physical hardware. */
   for (p = s; *p != '\0'; p++)
     outb (0x8900, *p);
 
+  /* For newer versions of qemu, you must run with -device
+   * isa-debug-exit, which exits on any write to an IO port (by
+   * default 0x501).  Qemu's exit code is double the value plus one,
+   * so there is no way to exit cleanly.  We use 0x31 which should
+   * result in a qemu exit code of 0x63.  */
+  outb (0x501, 0x31);
+
   /* This will power off a VMware VM if "gui.exitOnCLIHLT = TRUE"
      is set in its configuration file.  (The "pintos" script does
      that automatically.)  */