Add "machine exit" and "machine poweroff" commands to the arm64 and armv7

bootloaders.  Replace while (1) { } with for (;;) continue; per request
from tom@.

ok tom@, jsg@

3 files changed, 38 insertions, 6 deletions

diff --git a/sys/arch/armv7/stand/efiboot/conf.c b/sys/arch/armv7/stand/efiboot/conf.c
index 084ea3f9fb3..b8391d4bee0 100644
--- a/sys/arch/armv7/stand/efiboot/conf.c
+++ b/sys/arch/armv7/stand/efiboot/conf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: conf.c,v 1.9 2017/07/31 14:05:57 kettenis Exp $	*/
+/*	$OpenBSD: conf.c,v 1.10 2017/08/07 19:34:53 kettenis Exp $	*/
 
 /*
  * Copyright (c) 1996 Michael Shalayeff
@@ -35,7 +35,7 @@
 #include "efiboot.h"
 #include "efidev.h"
 
-const char version[] = "0.8";
+const char version[] = "0.9";
 int	debug = 0;
 
 struct fs_ops file_system[] = {
diff --git a/sys/arch/armv7/stand/efiboot/efiboot.c b/sys/arch/armv7/stand/efiboot/efiboot.c
index 621c78a0a62..d3209715da4 100644
--- a/sys/arch/armv7/stand/efiboot/efiboot.c
+++ b/sys/arch/armv7/stand/efiboot/efiboot.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: efiboot.c,v 1.17 2017/07/31 14:05:57 kettenis Exp $	*/
+/*	$OpenBSD: efiboot.c,v 1.18 2017/08/07 19:34:53 kettenis Exp $	*/
 
 /*
  * Copyright (c) 2015 YASUOKA Masahiko <yasuoka@yasuoka.net>
@@ -374,7 +374,7 @@ _rtt(void)
 	efi_cons_getc(0);
 #endif
 	/*
-	 * XXX ResetSystem doesn't seem to work on U-Boot 2016.05 on
+	 * XXX ResetSystem doesn't seem to work on U-Boot 2017.03 on
 	 * the CuBox-i.  So trigger an unimplemented instruction trap
 	 * instead.
 	 */
@@ -383,7 +383,8 @@ _rtt(void)
 #else
 	RS->ResetSystem(EfiResetCold, EFI_SUCCESS, 0, NULL);
 #endif
-	while (1) { }
+	for (;;)
+		continue;
 }
 
 /*
@@ -541,3 +542,32 @@ devopen(struct open_file *f, const char *fname, char **file)
 
 	return (*dp->dv_open)(f, unit, part);
 }
+
+/*
+ * Commands
+ */
+
+int Xexit_efi(void);
+int Xpoweroff_efi(void);
+
+const struct cmd_table cmd_machine[] = {
+	{ "exit",	CMDT_CMD, Xexit_efi },
+	{ "poweroff",	CMDT_CMD, Xpoweroff_efi },
+	{ NULL, 0 }
+};
+
+int
+Xexit_efi(void)
+{
+	EFI_CALL(BS->Exit, IH, 0, 0, NULL);
+	for (;;)
+		continue;
+	return (0);
+}
+
+int
+Xpoweroff_efi(void)
+{
+	EFI_CALL(RS->ResetSystem, EfiResetShutdown, EFI_SUCCESS, 0, NULL);
+	return (0);
+}
diff --git a/sys/arch/armv7/stand/efiboot/libsa.h b/sys/arch/armv7/stand/efiboot/libsa.h
index 14be675f708..1f0c7b0ec2b 100644
--- a/sys/arch/armv7/stand/efiboot/libsa.h
+++ b/sys/arch/armv7/stand/efiboot/libsa.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: libsa.h,v 1.2 2016/05/17 23:16:10 kettenis Exp $	*/
+/*	$OpenBSD: libsa.h,v 1.3 2017/08/07 19:34:53 kettenis Exp $	*/
 
 /*
  * Copyright (c) 2008 Mark Kettenis
@@ -28,3 +28,5 @@
 
 void machdep(void);
 void devboot(dev_t, char *);
+
+#define MACHINE_CMD	cmd_machine