forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
21 lines
498 B
21 lines
498 B
// SPDX-License-Identifier: GPL-2.0 |
|
|
|
#include <linux/types.h> |
|
|
|
#include "../../../util/tsc.h" |
|
|
|
u64 rdtsc(void) |
|
{ |
|
u64 val; |
|
|
|
/* |
|
* According to ARM DDI 0487F.c, from Armv8.0 to Armv8.5 inclusive, the |
|
* system counter is at least 56 bits wide; from Armv8.6, the counter |
|
* must be 64 bits wide. So the system counter could be less than 64 |
|
* bits wide and it is attributed with the flag 'cap_user_time_short' |
|
* is true. |
|
*/ |
|
asm volatile("mrs %0, cntvct_el0" : "=r" (val)); |
|
|
|
return val; |
|
}
|
|
|