ab95862908
Update to the upstream v3.7.0 @ e783cf1c Fix PowerPC architecture detection code Simplify jent_get_nstime() for PowerPC Restore previous jitterentropy public api Resolves: RHEL-176349 Signed-off-by: Vladislav Dronov <vdronov@redhat.com>
50 lines
1.5 KiB
Diff
50 lines
1.5 KiB
Diff
diff --git jitterentropy-base-user.h jitterentropy-base-user.h
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--- jitterentropy-base-user.h
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+++ jitterentropy-base-user.h
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@@ -196,42 +196,14 @@ static inline void jent_get_nstime(uint64_t *out)
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*out = *(uint64_t *)(clk + 1);
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}
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-#elif defined(__powerpc)
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-/*
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- * Uncomment this for newer PPC CPUs
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- * Newer PPC CPUs do not support mftbu/mftb
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- * these instructions were obsoleted and replaced by
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- * mfspr. special processor registers 268 and 269 are the
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- * ones we want.
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- */
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- /* #define POWER_PC_USE_NEW_INSTRUCTIONS */
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-
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-/* taken from http://www.ecrypt.eu.org/ebats/cpucycles.html */
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+#elif defined(__powerpc__)
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static inline void jent_get_nstime(uint64_t *out)
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{
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- unsigned long high;
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- unsigned long low;
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- unsigned long newhigh;
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- uint64_t result;
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-#ifdef POWER_PC_USE_NEW_INSTRUCTIONS /* Newer PPC CPUs do not support mftbu/mftb */
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- __asm__ __volatile__(
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- "Lcpucycles:mfspr %0, 269;mfspr %1, 268;mfspr %2, 269;cmpw %0,%2;bne Lcpucycles"
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- : "=r" (high), "=r" (low), "=r" (newhigh)
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- );
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-#else
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- __asm__ __volatile__(
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- "Lcpucycles:mftbu %0;mftb %1;mftbu %2;cmpw %0,%2;bne Lcpucycles"
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- : "=r" (high), "=r" (low), "=r" (newhigh)
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- );
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-#endif
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- result = high;
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- result <<= 32;
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- result |= low;
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- *out = result;
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+ *out = (uint64_t)__builtin_ppc_get_timebase();
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}
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-#else /* (__x86_64__) || (__i386__) || (__aarch64__) || (__s390x__) || (__powerpc) */
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+#else /* (__x86_64__) || (__i386__) || (__aarch64__) || (__s390x__) || (__powerpc__) */
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static inline void jent_get_nstime(uint64_t *out)
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{
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