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target-alpha: Use a fixed frequency for the RPCC in system mode.

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Also include the PCC_OFS in the return value.  For user mode we
can pretend the PCC_OFS value is always zero.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2011-04-18 19:53:31 -07:00 committed by Richard Henderson
parent 5b4504079a
commit e5214853ea
1 changed files with 10 additions and 1 deletions
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11
target-alpha/op_helper.c
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@ -65,8 +65,17 @@ static void QEMU_NORETURN arith_excp(int exc, uint64_t mask)
uint64_t helper_load_pcc (void)
{
/* ??? This isn't a timer for which we have any rate info. */
#ifndef CONFIG_USER_ONLY
/* In system mode we have access to a decent high-resolution clock.
In order to make OS-level time accounting work with the RPCC,
present it with a well-timed clock fixed at 250MHz. */
return (((uint64_t)env->pcc_ofs << 32)
| (uint32_t)(qemu_get_clock_ns(vm_clock) >> 2));
#else
/* In user-mode, vm_clock doesn't exist. Just pass through the host cpu
clock ticks. Also, don't bother taking PCC_OFS into account. */
return (uint32_t)cpu_get_real_ticks();
#endif
}
uint64_t helper_load_fpcr (void)