kernel-ark/arch/s390/include/asm/timex.h
Martin Schwidefsky b6112ccbff [S390] add read_persistent_clock
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>
2009-04-14 15:37:27 +02:00

94 lines
2.0 KiB
C

/*
* include/asm-s390/timex.h
*
* S390 version
* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
*
* Derived from "include/asm-i386/timex.h"
* Copyright (C) 1992, Linus Torvalds
*/
#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)
{
int cc;
asm volatile(
" sck 0(%2)\n"
" ipm %0\n"
" srl %0,28\n"
: "=d" (cc) : "m" (time), "a" (&time) : "cc");
return cc;
}
static inline int store_clock(__u64 *time)
{
int cc;
asm volatile(
" stck 0(%2)\n"
" ipm %0\n"
" srl %0,28\n"
: "=d" (cc), "=m" (*time) : "a" (time) : "cc");
return cc;
}
static inline void set_clock_comparator(__u64 time)
{
asm volatile("sckc 0(%1)" : : "m" (time), "a" (&time));
}
static inline void store_clock_comparator(__u64 *time)
{
asm volatile("stckc 0(%1)" : "=m" (*time) : "a" (time));
}
#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
typedef unsigned long long cycles_t;
static inline unsigned long long get_clock (void)
{
unsigned long long clk;
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
asm volatile("stck %0" : "=Q" (clk) : : "cc");
#else /* __GNUC__ */
asm volatile("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc");
#endif /* __GNUC__ */
return clk;
}
static inline unsigned long long get_clock_xt(void)
{
unsigned char clk[16];
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
asm volatile("stcke %0" : "=Q" (clk) : : "cc");
#else /* __GNUC__ */
asm volatile("stcke 0(%1)" : "=m" (clk)
: "a" (clk) : "cc");
#endif /* __GNUC__ */
return *((unsigned long long *)&clk[1]);
}
static inline cycles_t get_cycles(void)
{
return (cycles_t) get_clock() >> 2;
}
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