Djam/u-boot
1
0
Fork 0
mirror of https://github.com/u-boot/u-boot.git synced 2025-05-08 10:39:08 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

x86: Add function to read time stamp counter

Browse source 
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>
This commit is contained in:
Vadim Bendebury 2012-10-23 18:04:32 +00:00 • committed by Simon Glass
parent 57be9172fc
commit 2f899e03a9
2 changed files with 29 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

12
arch/x86/include/asm/u-boot-x86.h
View file

@ -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_ */