Restore poweroff to some of it's former glory (on QEMU, at least)

commands/poweroff/poweroff.sh

@@ -10,4 +10,4 @@ fi
 
 PATH=/usr/bin:$PATH
 
-exec shutdown -x off
+exec shutdown -p

commands/reboot/halt.c

@@ -34,7 +34,7 @@ char *reboot_code = "delay; boot";
 void
 usage()
 {
-  fprintf(stderr, "Usage: %s [-hrRfd] [-x reboot-code]\n", prog);
+  fprintf(stderr, "Usage: %s [-hrRfpd] [-x reboot-code]\n", prog);
   exit(1);
 }
 
@@ -66,6 +66,7 @@ char **argv;
       case 'r': flag = RBT_REBOOT; 	break;
       case 'R': flag = RBT_RESET; 	break;
       case 'd': flag = RBT_DEFAULT; 	break;
+      case 'p': flag = RBT_POWEROFF; 	break;
       case 'f': fast = 1; break;
       case 'x':
 	flag = RBT_MONITOR;

commands/reboot/shutdown.c

@@ -148,6 +148,7 @@ char *argv[];
 	break;
       case 'h':
       case 'r':
+      case 'p':
       case 'x':
       case 'd':
 	reboot_flag = *opt;
@@ -273,10 +274,11 @@ char *argv[];
 
 void usage()
 {
-  fputs("Usage: shutdown [-hrRmkd] [-x code] [time [message]]\n", stderr);
+  fputs("Usage: shutdown [-hrRpmkd] [-x code] [time [message]]\n", stderr);
   fputs("       -h -> halt system after shutdown\n", stderr);
   fputs("       -r -> reboot system after shutdown\n", stderr);
   fputs("       -R -> reset system after shutdown\n", stderr);
+  fputs("       -p -> power system off after shutdown\n", stderr);
   fputs("       -x -> return to the monitor doing...\n", stderr);
   fputs("       -d -> default CTRL-ALT-DEL shutdown for current bootloader\n", stderr);
   fputs("       -m -> read a shutdown message from standard input\n", stderr);

include/sys/reboot.h

@@ -8,6 +8,7 @@
 #define RBT_MONITOR	   3	/* let the monitor do this */
 #define RBT_RESET	   4	/* hard reset the system */
 #define RBT_DEFAULT	   5	/* return to monitor, reset if not possible */
-#define RBT_INVALID	   6	/* first invalid reboot flag */
+#define RBT_POWEROFF	   6	/* power off, reset if not possible */
+#define RBT_INVALID	   7	/* first invalid reboot flag */
 
 #endif

kernel/arch/i386/arch_reset.c

@@ -80,6 +80,19 @@ reset(void)
 	}
 }
 
+void
+poweroff(void)
+{
+	const char *shutdown_str;
+	
+	/* Bochs/QEMU poweroff */
+	shutdown_str = "Shutdown";
+        while (*shutdown_str) outb(0x8900, *(shutdown_str++));
+	
+	/* fallback option: reset */
+	reset();
+}
+
 __dead void arch_shutdown(int how)
 {
 	unsigned char unused_ch;
@@ -114,6 +127,11 @@ __dead void arch_shutdown(int how)
 			/* Stop */
 			for (; ; ) halt_cpu();
 			NOT_REACHABLE;
+			
+		case RBT_POWEROFF:
+			/* Power off if possible, reset otherwise */
+			poweroff();
+			NOT_REACHABLE;
 
 		default:	
 		case RBT_REBOOT:

servers/pm/main.c

@@ -398,7 +398,7 @@ static void handle_vfs_reply()
 	 * the PM, will get a HARD_STOP notification. Await the
 	 * notification in the main loop.
 	 */
-	sys_abort(RBT_DEFAULT);
+	sys_abort(abort_flag);
 
 	return;
   }