Decorated Operations for QorIQ P3/P4/P5 Processors - Freescale ...

Sample Application
volatile int32_t *decorated_counter = NULL;
volatile int32_t lock_counter = 0;
__PERCPU volatile int32_t private_counter = 0;
void singlecore_test(void)
{
uint32_t i;
atb_start = mfspr(SPR_ATBL); //start timer
atb_stop = mfspr(SPR_ATBL); //stop timer
atb_oh = atb_stop - atb_start;
APP_INFO ("Start/Stop overhead is %d cycles.", atb_oh);
atb_oh=4;
atb_start = mfspr(SPR_ATBL); //start timer
decorated_notify_inc_32(decorated_counter);
atb_stop = mfspr(SPR_ATBL); //stop timer
APP_INFO ("1 Decoration took %d cycles.", atb_stop-atb_start - atb_oh);
atb_start = mfspr(SPR_ATBL); //start timer
for(i=0; i < 10; i++){
decorated_notify_inc_32(decorated_counter);
}
atb_stop = mfspr(SPR_ATBL); //stop timer
APP_INFO ("10 Decorations took %d cycles.", atb_stop-atb_start - atb_oh);
atb_start = mfspr(SPR_ATBL); //start timer
for(i=0; i < 1; i++){
spin_lock(&sync_lock);
lock_counter+=i;
spin_unlock(&sync_lock);
}
atb_stop = mfspr(SPR_ATBL); //stop timer
APP_INFO ("1 lock counter took %d cycles.", atb_stop-atb_start - atb_oh);
Decorated Operations for QorIQ P3/P4/P5 Processors, Rev. A
10 Freescale Confidential Proprietary Freescale Semiconductor
Preliminary—Subject to Change Without Notice