/**
* Context switches are realized using software interrupts since interrupt
* entry and exit functions are the only way to save and restore complete
* context including spilling the register windows to the stack
*/
void IRAM_ATTR thread_yield_isr(void* arg)
{
/* clear the interrupt first */
DPORT_WRITE_PERI_REG(DPORT_CPU_INTR_FROM_CPU_0_REG, 0);
/* set the context switch flag (indicates that context has to be switched
is switch on exit from interrupt in _frxt_int_exit */
_frxt_setup_switch();
}
int trax_enable(trax_ena_select_t which)
{
#if !CONFIG_ESP32_TRAX
ESP_LOGE(TAG, "Trax_enable called, but trax is disabled in menuconfig!");
return ESP_ERR_NO_MEM;
#endif
#if !CONFIG_ESP32_TRAX_TWOBANKS
if (which == TRAX_ENA_PRO_APP || which == TRAX_ENA_PRO_APP_SWAP) return ESP_ERR_NO_MEM;
#endif
if (which == TRAX_ENA_PRO_APP || which == TRAX_ENA_PRO_APP_SWAP) {
DPORT_WRITE_PERI_REG(DPORT_TRACEMEM_MUX_MODE_REG, (which == TRAX_ENA_PRO_APP_SWAP)?TRACEMEM_MUX_PROBLK1_APPBLK0:TRACEMEM_MUX_PROBLK0_APPBLK1);
} else {
DPORT_WRITE_PERI_REG(DPORT_TRACEMEM_MUX_MODE_REG, TRACEMEM_MUX_BLK0_ONLY);
}
DPORT_WRITE_PERI_REG(DPORT_PRO_TRACEMEM_ENA_REG, (which == TRAX_ENA_PRO_APP || which == TRAX_ENA_PRO_APP_SWAP || which == TRAX_ENA_PRO));
DPORT_WRITE_PERI_REG(DPORT_APP_TRACEMEM_ENA_REG, (which == TRAX_ENA_PRO_APP || which == TRAX_ENA_PRO_APP_SWAP || which == TRAX_ENA_APP));
return ESP_OK;
}
/**
* If we are already in an interrupt handler, the function simply sets the
* context switch flag, which indicates that the context has to be switched
* in the _frxt_int_exit function when exiting the interrupt. Otherwise, we
* will generate a software interrupt to force the context switch when
* terminating the software interrupt (see thread_yield_isr).
*/
void thread_yield_higher(void)
{
/* reset hardware watchdog */
system_wdt_feed();
/* yield next task */
#if defined(ENABLE_DEBUG) && defined(DEVELHELP)
if (sched_active_thread) {
DEBUG("%u old task %u %s %u\n", system_get_time(),
sched_active_thread->pid, sched_active_thread->name,
sched_active_thread->sp - sched_active_thread-> stack_start);
}
#endif
if (!irq_is_in()) {
/* generate the software interrupt to switch the context */
DPORT_WRITE_PERI_REG(DPORT_CPU_INTR_FROM_CPU_0_REG, DPORT_CPU_INTR_FROM_CPU_0);
}
else {
/* set the context switch flag */
_frxt_setup_switch();
}
#if defined(ENABLE_DEBUG) && defined(DEVELHELP)
if (sched_active_thread) {
DEBUG("%u new task %u %s %u\n", system_get_time(),
sched_active_thread->pid, sched_active_thread->name,
sched_active_thread->sp - sched_active_thread-> stack_start);
}
#endif
/*
* Instruction fetch synchronize: Waits for all previously fetched load,
* store, cache, and special register write instructions that affect
* instruction fetch to be performed before fetching the next instruction.
*/
__asm__("isync");
return;
}
