diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h
index d2cd727..d2d6e02 100644
--- a/lib/s390x/asm/arch_def.h
+++ b/lib/s390x/asm/arch_def.h
@@ -10,6 +10,24 @@
 #ifndef _ASM_S390X_ARCH_DEF_H_
 #define _ASM_S390X_ARCH_DEF_H_
 
+/* SIGP order codes */
+#define SIGP_SENSE			1
+#define SIGP_EXTERNAL_CALL		2
+#define SIGP_EMERGENCY_SIGNAL		3
+#define SIGP_START			4
+#define SIGP_STOP			5
+#define SIGP_RESTART			6
+#define SIGP_STOP_AND_STORE_STATUS	9
+#define SIGP_INITIAL_CPU_RESET		11
+#define SIGP_CPU_RESET			12
+#define SIGP_SET_PREFIX			13
+#define SIGP_STORE_STATUS_AT_ADDRESS	14
+#define SIGP_SET_ARCHITECTURE		18
+#define SIGP_COND_EMERGENCY_SIGNAL	19
+#define SIGP_SENSE_RUNNING		21
+#define SIGP_SET_MULTI_THREADING	22
+#define SIGP_STORE_ADDITIONAL_STATUS	23
+
 struct psw {
 	uint64_t	mask;
 	uint64_t	addr;
diff --git a/lib/s390x/io.c b/lib/s390x/io.c
index 7bca637..05a0765 100644
--- a/lib/s390x/io.c
+++ b/lib/s390x/io.c
@@ -14,6 +14,7 @@
 #include <argv.h>
 #include <asm/spinlock.h>
 #include <asm/facility.h>
+#include <asm/arch_def.h>
 #include "sclp.h"
 
 extern char ipl_args[];
@@ -37,14 +38,14 @@ static void sigp_stop(void)
 
 	asm volatile(
 		"	sigp %0,%1,0(%2)\n"
-		: "+d" (status)  : "d" (cpu), "d" (5) : "cc");
+		: "+d" (status)  : "d" (cpu), "d" (SIGP_STOP) : "cc");
 }
 
 void setup(void)
 {
 	setup_args_progname(ipl_args);
 	setup_facilities();
-	sclp_ascii_setup();
+	sclp_console_setup();
 	sclp_memory_setup();
 }
 
diff --git a/lib/s390x/sclp-ascii.c b/lib/s390x/sclp-console.c
similarity index 54%
rename from lib/s390x/sclp-ascii.c
rename to lib/s390x/sclp-console.c
index 893ca17..deacbde 100644
--- a/lib/s390x/sclp-ascii.c
+++ b/lib/s390x/sclp-console.c
@@ -35,34 +35,34 @@ int sclp_service_call(unsigned int command, void *sccb)
 
 static void sclp_set_write_mask(void)
 {
-    WriteEventMask *sccb = (void *)_sccb;
+	WriteEventMask *sccb = (void *)_sccb;
 
-    sccb->h.length = sizeof(WriteEventMask);
-    sccb->mask_length = sizeof(unsigned int);
-    sccb->receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
-    sccb->cp_receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
-    sccb->send_mask = SCLP_EVENT_MASK_MSG_ASCII;
-    sccb->cp_send_mask = SCLP_EVENT_MASK_MSG_ASCII;
+	sccb->h.length = sizeof(WriteEventMask);
+	sccb->mask_length = sizeof(unsigned int);
+	sccb->receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
+	sccb->cp_receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
+	sccb->send_mask = SCLP_EVENT_MASK_MSG_ASCII;
+	sccb->cp_send_mask = SCLP_EVENT_MASK_MSG_ASCII;
 
-    sclp_service_call(SCLP_CMD_WRITE_EVENT_MASK, sccb);
+	sclp_service_call(SCLP_CMD_WRITE_EVENT_MASK, sccb);
 }
 
-void sclp_ascii_setup(void)
+void sclp_console_setup(void)
 {
-    sclp_set_write_mask();
+	sclp_set_write_mask();
 }
 
 void sclp_print(const char *str)
 {
-    int len = strlen(str);
-    WriteEventData *sccb = (void *)_sccb;
+	int len = strlen(str);
+	WriteEventData *sccb = (void *)_sccb;
 
-    sccb->h.length = sizeof(WriteEventData) + len;
-    sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
-    sccb->ebh.length = sizeof(EventBufferHeader) + len;
-    sccb->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
-    sccb->ebh.flags = 0;
-    memcpy(sccb->data, str, len);
+	sccb->h.length = sizeof(WriteEventData) + len;
+	sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
+	sccb->ebh.length = sizeof(EventBufferHeader) + len;
+	sccb->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
+	sccb->ebh.flags = 0;
+	memcpy(sccb->data, str, len);
 
-    sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
+	sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
 }
diff --git a/lib/s390x/sclp.h b/lib/s390x/sclp.h
index 21d482b..e008932 100644
--- a/lib/s390x/sclp.h
+++ b/lib/s390x/sclp.h
@@ -207,7 +207,7 @@ typedef struct ReadEventData {
     uint32_t mask;
 } __attribute__((packed)) ReadEventData;
 
-void sclp_ascii_setup(void);
+void sclp_console_setup(void);
 void sclp_print(const char *str);
 extern char _sccb[];
 int sclp_service_call(unsigned int command, void *sccb);
diff --git a/s390x/Makefile b/s390x/Makefile
index 8ba2b92..ede2961 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -38,7 +38,7 @@ cflatobjs += lib/alloc_phys.o
 cflatobjs += lib/s390x/io.o
 cflatobjs += lib/s390x/stack.o
 cflatobjs += lib/s390x/sclp.o
-cflatobjs += lib/s390x/sclp-ascii.o
+cflatobjs += lib/s390x/sclp-console.o
 cflatobjs += lib/s390x/interrupt.o
 cflatobjs += lib/s390x/mmu.o
 
