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[S390] add read_persistent_clock

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Add a read_persistent_clock function that does not just return 0.
Since timekeeping_init calls the function before time_init has been
called move reset_tod_clock to early.c to make sure that the TOD
clock is running when read_persistent_clock is invoked.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2009-04-14 15:36:28 +02:00
parent 5b409ed17b
commit b6112ccbff
4 changed files with 35 additions and 21 deletions
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5
arch/s390/include/asm/timex.h
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@@ -11,6 +11,9 @@
#ifndef _ASM_S390_TIMEX_H
#define _ASM_S390_TIMEX_H
/* The value of the TOD clock for 1.1.1970. */
#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
/* Inline functions for clock register access. */
static inline int set_clock(__u64 time)
{
@@ -85,4 +88,6 @@ int get_sync_clock(unsigned long long *clock);
void init_cpu_timer(void);
unsigned long long monotonic_clock(void);
extern u64 sched_clock_base_cc;
#endif