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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 Claude Code (Opus 5.5).
* 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"
/* Naturally aligned 64-bit MMIO accesses are single loads and stores on
RV64; volatile keeps the compiler from caching or reordering them. */
#define MTIME (*(volatile uint64_t *)ERBIUM_MTIME)
#define MTIMECMP (*(volatile uint64_t *)ERBIUM_MTIMECMP)
int hwtimer_init(void)
{
MTIMECMP = MTIME + TICKNUM_PER_TIMER;
return 0;
}
int hwtimer_handler(void)
{
/* Advance from the previous compare value, so trap latency does not
accumulate as tick drift. */
uint64_t next = MTIMECMP + TICKNUM_PER_TIMER;
uint64_t now = MTIME;
if (next <= now)
next = now + TICKNUM_PER_TIMER;
MTIMECMP = next;
return 0;
}
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