Shutdown changes for multiboot: CTRL-ALT-DEL resets, panic halts

commands/reboot/halt.c

@@ -32,7 +32,7 @@ char *reboot_code = "delay; boot";
 void
 usage()
 {
-  fprintf(stderr, "Usage: %s [-hrRf] [-x reboot-code]\n", prog);
+  fprintf(stderr, "Usage: %s [-hrRfd] [-x reboot-code]\n", prog);
   exit(1);
 }
 
@@ -63,6 +63,7 @@ char **argv;
       case 'h': flag = RBT_HALT; 	break;
       case 'r': flag = RBT_REBOOT; 	break;
       case 'R': flag = RBT_RESET; 	break;
+      case 'd': flag = RBT_DEFAULT; 	break;
       case 'f': fast = 1; break;
       case 'x':
 	flag = RBT_MONITOR;

commands/reboot/shutdown.c

@@ -20,6 +20,7 @@
    -C: crash check, i.e. is the last wtmp entry a shutdown entry?
    -x: let the monitor execute the given code
    -R: reset the system
+   -d: default CTRL-ALT-DEL shutdown for current bootloader
  */
 
 #define _POSIX_SOURCE	1
@@ -148,6 +149,7 @@ char *argv[];
       case 'h':
       case 'r':
       case 'x':
+      case 'd':
 	reboot_flag = *opt;
 	if (reboot_flag == 'x') {
 	  if (*++opt == 0) {
@@ -271,11 +273,12 @@ char *argv[];
 
 void usage()
 {
-  fputs("Usage: shutdown [-hrRmk] [-x code] [time [message]]\n", stderr);
+  fputs("Usage: shutdown [-hrRmkd] [-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("       -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);
   fputs("       -k -> stop an already running shutdown\n", stderr);
   fputs("       code -> boot monitor code to be executed\n", stderr);

drivers/tty/keyboard.c

@@ -735,7 +735,7 @@ int scode;			/* scan code of key just struck or released */
   {
 	if (++CAD_count == 3) {
 		cons_stop();
-		sys_abort(RBT_HALT);
+		sys_abort(RBT_DEFAULT);
 	}
 	sys_kill(INIT_PROC_NR, SIGABRT);
 	rebooting = 1;

include/unistd.h

@@ -35,7 +35,8 @@
 #define RBT_PANIC	   2	/* a server panics */
 #define RBT_MONITOR	   3	/* let the monitor do this */
 #define RBT_RESET	   4	/* hard reset the system */
-#define RBT_INVALID	   5	/* first invalid reboot flag */
+#define RBT_DEFAULT	   5	/* return to monitor, reset if not possible */
+#define RBT_INVALID	   6	/* first invalid reboot flag */
 
 #define _PM_SEG_FLAG (1L << 30)	/* for read() and write() to FS by PM */
 #endif

kernel/arch/i386/arch_system.c

@@ -66,9 +66,10 @@ PRIVATE __dead void arch_bios_poweroff(void)
 
 PUBLIC int cpu_has_tsc;
 
-PUBLIC __dead void arch_shutdown(const int how)
+PUBLIC __dead void arch_shutdown(int how)
 {
 	static char mybuffer[sizeof(params_buffer)];
+	u16_t magic;
 	vm_stop();
 
 	/* Mask all interrupts, including the clock. */
@@ -85,6 +86,10 @@ PUBLIC __dead void arch_shutdown(const int how)
 		}
 	}
 
+	if (how == RBT_DEFAULT) {
+		how = mon_return ? RBT_HALT : RBT_RESET;
+	}
+
 	if(how != RBT_RESET) {
 		/* return to boot monitor */
 
@@ -129,24 +134,52 @@ PUBLIC __dead void arch_shutdown(const int how)
 		}
 		if (mon_return)
 			arch_monitor();
-		else {
+
+		/* monitor command with no monitor: reset or poweroff 
+		 * depending on the parameters
+		 */
+		if (how == RBT_MONITOR) {
 			mybuffer[0] = '\0';
-			arch_get_params(mybuffer,sizeof(mybuffer));
+			arch_get_params(mybuffer, sizeof(mybuffer));
 			if (strstr(mybuffer, "boot") ||
 				strstr(mybuffer, "menu") ||	
 				strstr(mybuffer, "reset"))
-				reset();
+				how = RBT_RESET;
 			else
-				arch_bios_poweroff();
+				how = RBT_HALT;
 		}
-	} else {
-		/* Reset the system by forcing a processor shutdown. First stop
-		 * the BIOS memory test by setting a soft reset flag.
+	}
+
+	switch (how) {
+		case RBT_REBOOT:
+		case RBT_RESET:
+			/* Reset the system by forcing a processor shutdown. 
+			 * First stop the BIOS memory test by setting a soft
+			 * reset flag.
 			 */
-		u16_t magic = STOP_MEM_CHECK;
+			magic = STOP_MEM_CHECK;
 			phys_copy(vir2phys(&magic), SOFT_RESET_FLAG_ADDR,
        		 	SOFT_RESET_FLAG_SIZE);
 			reset();
+			NOT_REACHABLE;
+
+		case RBT_HALT:
+			/* Poweroff without boot monitor */
+			arch_bios_poweroff();
+			NOT_REACHABLE;
+
+		case RBT_PANIC:
+			/* Allow user to read panic message */
+			for (; ; ) halt_cpu();
+			NOT_REACHABLE;
+
+		default:	
+			/* Not possible! trigger panic */
+			assert(how != RBT_MONITOR);
+			assert(how != RBT_DEFAULT);
+			assert(how < RBT_INVALID);
+			panic("unexpected value for how: %d", how);
+			NOT_REACHABLE;
 	}
 
 	NOT_REACHABLE;

man/man8/shutdown.8

@@ -3,7 +3,7 @@
 shutdown \- graciously close the system down
 .SH SYNOPSIS
 .B shutdown
-.RB [ \-hrRmk ]
+.RB [ \-hrRmkd ]
 .RB [ \-x
 .IR code ]
 .RI [ time-specification
@@ -60,6 +60,10 @@ to the Boot Monitor.  With
 .B \-R
 the system will receive a hardware reset.
 .TP
+.B \-d
+Default CTRL-ALT-DEL shutdown for current bootloader; drops to the boot 
+monitor is possible and resets otherwise.
+.TP
 .BI \-x " code"
 Halt the system and let the Monitor execute the given code as if typed at
 the monitor prompt.  You can for instance use

servers/init/init.c

@@ -30,7 +30,7 @@
 #include <utmp.h>
 
 /* Command to execute as a response to the three finger salute. */
-char *REBOOT_CMD[] =	{ "shutdown", "now", "CTRL-ALT-DEL", NULL };
+char *REBOOT_CMD[] =	{ "shutdown", "-d", "now", "CTRL-ALT-DEL", NULL };
 
 /* Associated fake ttytab entry. */
 struct ttyent TT_REBOOT = { "console", "-", REBOOT_CMD, NULL };