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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 "csr.h"
#include "hwtimer.h"
#include "plic.h"
#include "uart.h"
#define TEST_TIMER_INTERVAL 8u
#define TEST_REQUIRED_INTERRUPTS 10000u
static TX_THREAD test_thread;
static UCHAR test_stack[2048];
volatile unsigned int test_irq_count;
volatile unsigned int test_expected_bit;
/* Run the kernel with the board's normal interrupt setup. */
int main(void)
{
tx_kernel_enter();
return 0;
}
/* Compare the PLIC word and the ISR's expected bit atomically. */
static int test_bit_matches(void)
{
int enabled = riscv_mintr_save();
/* MISRA C:2012 Rule 11.4 deviation: the PLIC has a fixed MMIO address. */
uint32_t actual = *(volatile uint32_t *)PLIC_MENABLE(0u) & (1u << 2);
unsigned int expected = test_expected_bit;
riscv_mintr_restore(enabled);
return actual == (expected != 0u ? (1u << 2) : 0u);
}
/* Change source 1 while the timer ISR changes source 2. */
static void test_entry(ULONG input)
{
(void)input;
/* 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;
while (test_irq_count < TEST_REQUIRED_INTERRUPTS)
{
plic_irq_enable(1);
if (!test_bit_matches())
{
uart_puts("TEST_PLIC_LOST_UPDATE");
for (;;)
{
}
}
plic_irq_disable(1);
if (!test_bit_matches())
{
uart_puts("TEST_PLIC_LOST_UPDATE");
for (;;)
{
}
}
}
uart_puts("TEST_PLIC_NO_LOST_UPDATE");
for (;;)
{
}
}
/* Start one test thread. */
void tx_application_define(void *first_unused_memory)
{
(void)first_unused_memory;
(void)tx_thread_create(&test_thread, "plic test", test_entry, 0u,
test_stack, sizeof(test_stack), 1u, 1u,
TX_NO_TIME_SLICE, TX_AUTO_START);
}
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