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| author | Michael Brown | 2014-04-23 18:43:18 +0200 |
|---|---|---|
| committer | Michael Brown | 2014-04-28 00:14:43 +0200 |
| commit | e5f6a9be384f6adc2b50ffdb8781e81327b790aa (patch) | |
| tree | 42efc59b490b68891abd81a5cc11ac938c3848c2 /src/arch/x86_64 | |
| parent | [libc] Add flsll() (diff) | |
| download | ipxe-e5f6a9be384f6adc2b50ffdb8781e81327b790aa.tar.gz ipxe-e5f6a9be384f6adc2b50ffdb8781e81327b790aa.tar.xz ipxe-e5f6a9be384f6adc2b50ffdb8781e81327b790aa.zip | |
[profile] Add generic profiling infrastructure
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/arch/x86_64')
| -rw-r--r-- | src/arch/x86_64/include/bits/profile.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/src/arch/x86_64/include/bits/profile.h b/src/arch/x86_64/include/bits/profile.h new file mode 100644 index 000000000..6fc16d84b --- /dev/null +++ b/src/arch/x86_64/include/bits/profile.h @@ -0,0 +1,29 @@ +#ifndef _BITS_PROFILE_H +#define _BITS_PROFILE_H + +/** @file + * + * Profiling + * + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include <stdint.h> + +/** + * Get profiling timestamp + * + * @ret timestamp Timestamp + */ +static inline __attribute__ (( always_inline )) uint64_t +profile_timestamp ( void ) { + uint32_t eax; + uint32_t edx; + + /* Read timestamp counter */ + __asm__ __volatile__ ( "rdtsc" : "=a" ( eax ), "=d" ( edx ) ); + return ( ( ( ( uint64_t ) edx ) << 32 ) | eax ); +} + +#endif /* _BITS_PROFILE_H */ |