s390/time: add leap seconds to initial system time

The PTFF instruction can be used to retrieve information about UTC
including the current number of leap seconds. Use this value to
convert the coordinated server time value of the TOD clock to a
proper UTC timestamp to initialize the system time. Without this
correction the system time will be off by the number of leap seonds
until it has been corrected via NTP.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index 0f34db4238da..0bb08f341c09 100644
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -56,11 +56,13 @@ void __init ptff_init(void);
 
 extern unsigned char ptff_function_mask[16];
 extern unsigned long lpar_offset;
+extern unsigned long initial_leap_seconds;
 
 /* Function codes for the ptff instruction. */
 #define PTFF_QAF	0x00	/* query available functions */
 #define PTFF_QTO	0x01	/* query tod offset */
 #define PTFF_QSI	0x02	/* query steering information */
+#define PTFF_QUI	0x04	/* query UTC information */
 #define PTFF_ATO	0x40	/* adjust tod offset */
 #define PTFF_STO	0x41	/* set tod offset */
 #define PTFF_SFS	0x42	/* set fine steering rate */
@@ -82,6 +84,22 @@ static inline int ptff_query(unsigned int nr)
 	return (*ptr & (0x80 >> (nr & 7))) != 0;
 }
 
+/* Query UTC information result */
+struct ptff_qui {
+	unsigned int tm : 2;
+	unsigned int ts : 2;
+	unsigned int : 28;
+	unsigned int pad_0x04;
+	unsigned long leap_event;
+	short old_leap;
+	short new_leap;
+	unsigned int pad_0x14;
+	unsigned long prt[5];
+	unsigned long cst[3];
+	unsigned int skew;
+	unsigned int pad_0x5c[41];
+} __packed;
+
 static inline int ptff(void *ptff_block, size_t len, unsigned int func)
 {
 	typedef struct { char _[len]; } addrtype;