diff options
| author | David Hildenbrand <david@redhat.com> | 2017-12-08 17:02:05 +0100 |
|---|---|---|
| committer | Cornelia Huck <cohuck@redhat.com> | 2017-12-14 17:56:54 +0100 |
| commit | 4bac52f5c4b3dd5d0bd7568377ad7e957d5e3c6a (patch) | |
| tree | fef4787eeee9ef5222fcf5ab1b271f3e84c3b7bc /target/s390x/misc_helper.c | |
| parent | ad0ccf1e6a45c22d6c0564f8365bf1df39c64c15 (diff) | |
s390x/tcg: implement extract-CPU-time facility
It only provides the EXTRACT CPU TIME instruction. We can reuse the stpt
helper, which calculates the CPU timer value.
As the instruction is not privileged, but we don't have a CPU timer
value in case of linux user, we simply reuse cpu_get_host_ticks() to
produce some descending value.
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20171208160207.26494-13-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'target/s390x/misc_helper.c')
| -rw-r--r-- | target/s390x/misc_helper.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c index 7ddade2f0e..86da6aab7e 100644 --- a/target/s390x/misc_helper.c +++ b/target/s390x/misc_helper.c @@ -55,6 +55,21 @@ void HELPER(exception)(CPUS390XState *env, uint32_t excp) cpu_loop_exit(cs); } +/* Store CPU Timer (also used for EXTRACT CPU TIME) */ +uint64_t HELPER(stpt)(CPUS390XState *env) +{ +#if defined(CONFIG_USER_ONLY) + /* + * Fake a descending CPU timer. We could get negative values here, + * but we don't care as it is up to the OS when to process that + * interrupt and reset to > 0. + */ + return UINT64_MAX - (uint64_t)cpu_get_host_ticks(); +#else + return time2tod(env->cputm - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); +#endif +} + #ifndef CONFIG_USER_ONLY /* SCLP service call */ @@ -178,12 +193,6 @@ void HELPER(spt)(CPUS390XState *env, uint64_t time) timer_mod(env->cpu_timer, env->cputm); } -/* Store CPU Timer */ -uint64_t HELPER(stpt)(CPUS390XState *env) -{ - return time2tod(env->cputm - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); -} - /* Store System Information */ uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0, uint64_t r0, uint64_t r1) |