libprof/libprof.c

#include <gint/timer.h>
#include <gint/clock.h>
#include <gint/mpu/tmu.h>
#include <gint/std/stdlib.h>
#include <gint/hardware.h>

#include <libprof.h>

/* Recursion depth of each function currently being executed */
uint8_t *prof_rec = NULL;
/* Time that has elapsed within each function; the value for a given function
   is only relevant when it is not executing, due to optimizations */
uint32_t *prof_elapsed = NULL;
/* Timer counter */
uint32_t volatile *prof_tcnt = NULL;
/* Timer ID */
static int prof_timer;

/* prof_init(): Initialize the profiler's data and timer */
int prof_init(int context_count)
{
	prof_rec     = malloc(context_count * sizeof *prof_rec);
	prof_elapsed = malloc(context_count * sizeof *prof_elapsed);

	/* Get a TMU with the exact constant 0xffffffff */
	int timer = -1;
	for(int t = 2; t >= 0 && timer == -1; t--)
	{
		timer = timer_setup(t, 0xffffffff, NULL);
	}

	if(!prof_rec || !prof_elapsed || timer == -1)
	{
		prof_quit();
		return 1;
	}

	/* Fix the configuration done by gint by disabling the interrupt */
	if(isSH3())
	{
		SH7705_TMU.TMU[timer].TCR.UNIE = 0;
		prof_tcnt = &SH7705_TMU.TMU[timer].TCNT;
	}
	else
	{
		SH7305_TMU.TMU[timer].TCR.UNIE = 0;
		prof_tcnt = &SH7305_TMU.TMU[timer].TCNT;
	}

	timer_start(timer);
	prof_timer = timer;

	return 0;
}

/* prof_quit(): Free the profiler's data and timer */
void prof_quit(void)
{
	timer_stop(prof_timer);

	free(prof_rec);
	free(prof_time);
}

//---
//	Post-measurement analysis
//---

/* prof_time(): Time spent in a given context, in microseconds */
uint32_t prof_time(int ctx)
{
	int Pphi = clock_freq()->Pphi_f;
	uint64_t time = prof_elapsed[ctx];

	return (time * 4 * 1000000) / Pphi;
}