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/***************************************************************************
* Copyright (c) 2026 Eclipse ThreadX contributors
*
* 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.
*
* AI Disclosure: This file was largely AI-generated by Codex (GPT-6-Sol).
* The AI-generated portions may be considered public domain (CC0-1.0)
* and not subject to the project's licence. The human contributor has
* reviewed and verified that the code is correct.
*
* SPDX-License-Identifier: MIT and CC0-1.0
***************************************************************************/
#include "tx_api.h"
#include "hwtimer.h"
#include "plic.h"
#include "uart.h"
#include <stdint.h>
#define TEST_TIMER_INTERVAL 8u
#define TEST_MCAUSE_TIMER (((uintptr_t)1u << 63) | 7u)
extern volatile unsigned int test_irq_count;
extern volatile unsigned int test_expected_bit;
/* Toggle source 2 in timer context to preempt source 1 updates. */
void trap_handler(uintptr_t mcause, uintptr_t mepc, uintptr_t mtval)
{
(void)mepc;
(void)mtval;
if (mcause != TEST_MCAUSE_TIMER)
{
uart_puts("TEST_PLIC_UNEXPECTED_TRAP");
for (;;)
{
}
}
/* MISRA C:2012 Rule 11.4 deviation: the timer has a fixed MMIO address. */
*(volatile uint64_t *)ERBIUM_MTIMECMP =
*(volatile uint64_t *)ERBIUM_MTIME + TEST_TIMER_INTERVAL;
if (test_expected_bit == 0u)
{
plic_irq_enable(2);
test_expected_bit = 1u;
}
else
{
plic_irq_disable(2);
test_expected_bit = 0u;
}
test_irq_count++;
}
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