Drazen Urch
7bd1550195
* Checkpoint * cpu cycle ffi * Rename * mixnode feature * Bundle libcpucycles
28 lines
658 B
C
28 lines
658 B
C
// version 20230105
|
|
// public domain
|
|
// djb
|
|
// adapted from supercop/cpucycles/cortex.c
|
|
|
|
#include "cpucycles_internal.h"
|
|
|
|
long long ticks(void)
|
|
{
|
|
unsigned int result;
|
|
asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(result));
|
|
return (unsigned long long) result;
|
|
}
|
|
|
|
static long enable(void)
|
|
{
|
|
asm volatile("mcr p15, 0, %0, c9, c12, 0" :: "r"(17));
|
|
asm volatile("mcr p15, 0, %0, c9, c12, 1" :: "r"(0x8000000f));
|
|
asm volatile("mcr p15, 0, %0, c9, c12, 3" :: "r"(0x8000000f));
|
|
}
|
|
|
|
long long ticks_setup(void)
|
|
{
|
|
if (!cpucycles_works(enable)) return cpucycles_SKIP;
|
|
if (!cpucycles_works(ticks)) return cpucycles_SKIP;
|
|
return cpucycles_EXTEND32;
|
|
}
|