mirror of https://github.com/ipxe/ipxe.git
37 lines
701 B
C
37 lines
701 B
C
#ifndef _BITS_PROFILE_H
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#define _BITS_PROFILE_H
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/** @file
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*
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* Profiling
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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/**
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* Get profiling timestamp
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*
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* @ret timestamp Timestamp
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*/
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static inline __attribute__ (( always_inline )) uint64_t
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profile_timestamp ( void ) {
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uint32_t cycles_lo;
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uint32_t cycles_hi;
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uint32_t tmp;
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/* Read timestamp counter */
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__asm__ __volatile__ ( "\n1:\n\t"
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"rdcycleh %1\n\t"
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"rdcycle %0\n\t"
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"rdcycleh %2\n\t"
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"bne %1, %2, 1b\n\t"
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: "=r" ( cycles_lo ), "=r" ( cycles_hi ),
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"=r" ( tmp ) );
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return ( ( ( ( uint64_t ) cycles_hi ) << 32 ) | cycles_lo );
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}
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#endif /* _BITS_PROFILE_H */
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