From 2f899e03a94cac4b092e4c013c6afda73178cc9f Mon Sep 17 00:00:00 2001 From: Vadim Bendebury Date: Tue, 23 Oct 2012 18:04:32 +0000 Subject: 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 Signed-off-by: Stefan Reinauer Signed-off-by: Simon Glass --- arch/x86/include/asm/u-boot-x86.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'arch/x86/include/asm/u-boot-x86.h') diff --git a/arch/x86/include/asm/u-boot-x86.h b/arch/x86/include/asm/u-boot-x86.h index a4a5ae0..11be5c3 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_ */ -- cgit v1.1