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s390/time: use stcke instead of stck

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Use STORE CLOCK EXTENDED instead of STORE CLOCK in early tod clock
setup. This is just to remove another usage of stck, trying to remove
all usages of STORE CLOCK.  This doesn't fix anything.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-02-01 21:53:08 +01:00 committed by Vasily Gorbik
parent 683071b02c
commit b22446d00a
2 changed files with 9 additions and 7 deletions
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10
arch/s390/include/asm/timex.h
View File

@ -17,6 +17,8 @@
/* The value of the TOD clock for 1.1.1970. */
#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
#define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */
extern u64 clock_comparator_max;
/* Inline functions for clock register access. */
@ -32,15 +34,16 @@ static inline int set_tod_clock(__u64 time)
return cc;
}
static inline int store_tod_clock(__u64 *time)
static inline int store_tod_clock_ext(char *time)
{
typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype;
int cc;
asm volatile(
" stck %1\n"
" stcke %1\n"
" ipm %0\n"
" srl %0,28\n"
: "=d" (cc), "=Q" (*time) : : "cc");
: "=d" (cc), "=Q" (*(addrtype *)time) : : "cc");
return cc;
}
@ -144,7 +147,6 @@ static inline void local_tick_enable(unsigned long long comp)
}
#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
#define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */
typedef unsigned long long cycles_t;

6
arch/s390/kernel/early.c
View File

@ -35,12 +35,12 @@
static void __init reset_tod_clock(void)
{
u64 time;
char time[STORE_CLOCK_EXT_SIZE];
if (store_tod_clock(&time) == 0)
if (store_tod_clock_ext(time) == 0)
return;
/* TOD clock not running. Set the clock to Unix Epoch. */
if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock_ext(time) != 0)
disabled_wait();
memset(tod_clock_base, 0, 16);