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| author | Michael Brown | 2016-05-08 01:20:20 +0200 |
|---|---|---|
| committer | Michael Brown | 2016-05-08 01:20:20 +0200 |
| commit | 17c6f322eef5e0a2250a89b140486cf07598d2fa (patch) | |
| tree | c67442d1e56245b42f9e7b98f9fa0e7b9cc24b1d /src/arch/arm64/include/bits/profile.h | |
| parent | [arm] Split out 32-bit-specific code to arch/arm32 (diff) | |
| download | ipxe-17c6f322eef5e0a2250a89b140486cf07598d2fa.tar.gz ipxe-17c6f322eef5e0a2250a89b140486cf07598d2fa.tar.xz ipxe-17c6f322eef5e0a2250a89b140486cf07598d2fa.zip | |
[arm] Add support for 64-bit ARM (Aarch64)
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/arch/arm64/include/bits/profile.h')
| -rw-r--r-- | src/arch/arm64/include/bits/profile.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/arch/arm64/include/bits/profile.h b/src/arch/arm64/include/bits/profile.h new file mode 100644 index 000000000..cad02ea4b --- /dev/null +++ b/src/arch/arm64/include/bits/profile.h @@ -0,0 +1,30 @@ +#ifndef _BITS_PROFILE_H +#define _BITS_PROFILE_H + +/** @file + * + * Profiling + * + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +#include <stdint.h> + +/** + * Get profiling timestamp + * + * @ret timestamp Timestamp + */ +static inline __attribute__ (( always_inline )) uint64_t +profile_timestamp ( void ) { + uint64_t cycles; + + /* Read cycle counter */ + __asm__ __volatile__ ( "msr PMCR_EL0, %1\n\t" + "mrs %0, PMCCNTR_EL0\n\t" + : "=r" ( cycles ) : "r" ( 1 ) ); + return cycles; +} + +#endif /* _BITS_PROFILE_H */ |