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--- a/absl/base/internal/unscaledcycleclock.cc.orig 2021-10-11 21:53:31.946215000 +0200
+++ b/absl/base/internal/unscaledcycleclock.cc 2021-10-11 21:57:54.536557000 +0200
@@ -21,8 +21,15 @@
#endif
#if defined(__powerpc__) || defined(__ppc__)
+#ifdef __linux__
#include <sys/platform/ppc.h>
+#else
+#include "absl/base/call_once.h"
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <threads.h>
#endif
+#endif
#include "absl/base/internal/sysinfo.h"
@@ -56,11 +63,28 @@
#elif defined(__powerpc__) || defined(__ppc__)
int64_t UnscaledCycleClock::Now() {
+#ifdef __linux__
return __ppc_get_timebase();
+#else
+ int64_t tbr;
+ asm volatile("mfspr %0, 268" : "=r"(tbr));
+ return tbr;
+#endif
}
double UnscaledCycleClock::Frequency() {
+#ifdef __linux__
return __ppc_get_timebase_freq();
+#else
+ static once_flag init_timebase_frequency_once;
+ static double timebase_frequency = 0.0;
+ base_internal::LowLevelCallOnce(&init_timebase_frequency_once, [&]() {
+ size_t length = sizeof(timebase_frequency);
+ sysctlbyname("kern.timecounter.tc.timebase.frequency", &timebase_frequency,
+ &length, nullptr, 0);
+ });
+ return timebase_frequency;
+#endif
}
#elif defined(__aarch64__)
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