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powerpc: Add file forgotten in r346144

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Forgot to add the changes for DELAY(), which lowers priority during the
delay period.  Also, mark the timebase read as volatile so newer GCC does
not optimize it away, as it reportedly does currently.

MFC after:	2 weeks
MFC with:	r346144
This commit is contained in:
Justin Hibbits 2019-04-13 02:29:30 +00:00
parent e5355d3319
commit 77eb50c7a3
1 changed files with 4 additions and 1 deletions
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5
sys/powerpc/powerpc/clock.c
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@ -303,13 +303,16 @@ decr_get_timecount(struct timecounter *tc)
void
DELAY(int n)
{
u_quad_t tb, ttb;
volatile u_quad_t tb;
u_quad_t ttb;
TSENTER();
tb = mftb();
ttb = tb + howmany((uint64_t)n * 1000000, ps_per_tick);
nop_prio_vlow();
while (tb < ttb)
tb = mftb();
nop_prio_medium();
TSEXIT();
}