hal-cortexa.c

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#include <stdio.h>
#include "hal.h"
 
void hal_setup(const enum clock_mode clock)
{
    (void)clock;
    //TODO figure out if we need to do someting here
}
 
uint64_t hal_get_time() {
 
#if defined(AARCH64)
 
    uint64_t t;
    asm volatile("mrs %0, PMCCNTR_EL0":"=r"(t));
    return t;
 
    #elif defined(ARMV7l)
 
        // TODO: this is actually a 32-bit counter, so it won't work for very long running schemes
        //       need to figure out a way to get a 64-bit cycle counter
        unsigned int cc;
    asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(cc));
    return cc;
    #elif defined(x8664)
        uint64_t t = 0;
    return t;
#else
    uint64_t t = 0;
    return t;
#endif
}