Drazen Urch
7bd1550195
* Checkpoint * cpu cycle ffi * Rename * mixnode feature * Bundle libcpucycles
31 lines
557 B
C
31 lines
557 B
C
// version 20230105
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// public domain
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// djb
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// adapted from supercop/cpucycles/powerpccpuinfo.c
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#include "cpucycles_internal.h"
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long long ticks(void)
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{
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unsigned int high, low, newhigh;
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unsigned long long result;
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do {
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asm volatile(
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"mftbu %0; mftb %1; mftbu %2"
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: "=r" (high), "=r" (low), "=r" (newhigh)
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);
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} while (newhigh != high);
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result = high;
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result <<= 32;
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result |= low;
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return result;
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}
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long long ticks_setup(void)
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{
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if (!cpucycles_works(ticks)) return cpucycles_SKIP;
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return cpucycles_FINDMULTIPLIER;
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}
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