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Software for White Rabbit PTP Core
Commit 75881c80 authored by Alessandro Rubini's avatar Alessandro Rubini
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softpll_ng: avoid a libgcc 64-bit division, using ppsi/lib 

Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
parent 89cc3e49
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softpll/softpll_ng.c
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......@@ -398,11 +398,28 @@ int spll_check_lock(int channel)
&& softpll.aux[channel - 1].ld.locked;
}
#ifdef CONFIG_PPSI /* use __div64_32 from ppsi library to save libgcc memory */
static int32_t from_picos(int32_t ps)
{
extern uint32_t __div64_32(uint64_t *n, uint32_t base);
uint64_t ups = ps;
if (ps >= 0) {
ups *= 1 << HPLL_N;
__div64_32(&ups, CLOCK_PERIOD_PICOSECONDS);
return ups;
}
ups = -ps * (1 << HPLL_N);
__div64_32(&ups, CLOCK_PERIOD_PICOSECONDS);
return -ups;
}
#else /* previous implementation: ptp-noposix has no __div64_32 available */
static int32_t from_picos(int32_t ps)
{
return (int32_t) ((int64_t) ps * (int64_t) (1 << HPLL_N) /
(int64_t) CLOCK_PERIOD_PICOSECONDS);
}
#endif
static int32_t to_picos(int32_t units)
{
......
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