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/***************************************************************************
* Copyright (c) 2025 10xEngineers
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/*
* S-mode trap handler
*/
#include "csr.h"
#include "uart.h"
#include "hwtimer.h"
#include "plic.h"
#include <stdint.h>
#include <tx_port.h>
#include <tx_api.h>
/* scause bit 63: interrupt flag. */
#define SCAUSE_INTERRUPT 0x8000000000000000ull
#define SCAUSE_S_TIMER_INT (SCAUSE_INTERRUPT | 5u)
#define SCAUSE_S_EXTERNAL_INT (SCAUSE_INTERRUPT | 9u)
extern void _tx_timer_interrupt(void);
void trap_handler(uintptr_t cause, uintptr_t epc, uintptr_t tval)
{
(void)epc;
(void)tval;
if (cause & SCAUSE_INTERRUPT)
{
if (cause == SCAUSE_S_TIMER_INT)
{
hwtimer_handler();
_tx_timer_interrupt();
}
else if (cause == SCAUSE_S_EXTERNAL_INT)
{
if (plic_irq_intr() != 0)
{
puts("[trap] PLIC dispatch failed");
while (1)
;
}
}
else
{
puts("[trap] unhandled S-mode interrupt");
while (1)
;
}
}
else
{
puts("[trap] unhandled synchronous exception");
while (1)
;
}
}
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