/* ESP8266 Xtensa interrupt management functions
 *
 *
 * Part of esp-open-rtos
 * Copyright (C) 2015 Angus Gratton
 * BSD Licensed as described in the file LICENSE
 */
#include <esp/interrupts.h>

_xt_isr isr[16];

void IRAM _xt_isr_attach(uint8_t i, _xt_isr func)
{
    isr[i] = func;
}

/* Generic ISR handler.

   Handles all flags set for interrupts in 'intset'.
*/
uint16_t IRAM _xt_isr_handler(uint16_t intset)
{
    /* WDT has highest priority (occasional WDT resets otherwise) */
    if(intset & BIT(INUM_WDT)) {
        _xt_clear_ints(BIT(INUM_WDT));
        isr[INUM_WDT]();
        intset -= BIT(INUM_WDT);
    }

    while(intset) {
        uint8_t index = __builtin_ffs(intset) - 1;
        uint16_t mask = BIT(index);
        _xt_clear_ints(mask);
        isr[index]();
        intset -= mask;
    }

    return 0;
}