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src/arch/arm32/include/bits/profile.h
41 строка
835 B
Michael Brown
[arm] Check PMCCNTR availability before use for profiling
24 сен 2024, 18:14
24 сен 2024, 18:14
e028268
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#ifndef _BITS_PROFILE_H #define _BITS_PROFILE_H /** @file * * Profiling * */ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <stdint.h> extern uint32_t pmccntr_status; /** * Get profiling timestamp * * @ret timestamp Timestamp */ static inline __attribute__ (( always_inline )) unsigned long profile_timestamp ( void ) { uint32_t cycles; /* Read cycle counter */ __asm__ __volatile__ ( /* Check PMCCNTR status */ "tst %0, %0\n\t" /* Check availability if not yet known */ "it mi\n\t" "blxmi pmccntr_check\n\t" /* Read PMCCNTR if available */ "it ne\n\t" "mrcne p15, 0, %0, c9, c13, 0\n\t" "\n1:\n\t" : "=r" ( cycles ) : "0" ( pmccntr_status ) : "cc", "lr" ); return cycles; } #endif /* _BITS_PROFILE_H */