diff options
| author | Vadim Bendebury | 2012-10-23 18:04:32 +0000 |
|---|---|---|
| committer | Simon Glass | 2012-12-06 14:30:38 -0800 |
| commit | 2f899e03a94cac4b092e4c013c6afda73178cc9f (patch) | |
| tree | 0b849b105c20f56c6b173f11bb2beeee4e0d4928 /arch/x86/include | |
| parent | 57be9172fc87fa156973faadb7b74c36ae5c52e7 (diff) | |
x86: Add function to read time stamp counter
Put this function in the u-boot-x86.h header file. We could instead create
timer.h perhaps.
We support setting a base time, and reading the time relative to this base.
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/u-boot-x86.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/include/asm/u-boot-x86.h b/arch/x86/include/asm/u-boot-x86.h index a4a5ae05d11..11be5c35b56 100644 --- a/arch/x86/include/asm/u-boot-x86.h +++ b/arch/x86/include/asm/u-boot-x86.h @@ -68,4 +68,16 @@ int video_init(void); void board_init_f_r_trampoline(ulong) __attribute__ ((noreturn)); void board_init_f_r(void) __attribute__ ((noreturn)); +/* Read the time stamp counter */ +static inline uint64_t rdtsc(void) +{ + uint32_t high, low; + __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high)); + return (((uint64_t)high) << 32) | low; +} + +/* board/... */ +void timer_set_tsc_base(uint64_t new_base); +uint64_t timer_get_tsc(void); + #endif /* _U_BOOT_I386_H_ */ |