Function sys_cacheflush

components/lwp/lwp_syscall.c:9424–9446

* @brief Flush the cache for a specified memory region. * * This function flushes the cache for a specified memory region. It is commonly used * to ensure that the contents of a memory region are written back to the main memory * or that stale cache entries are invalidated. The cache operation can be controlled * by the `cache` parameter to determine whether to clean or invalidate the cache.

 *       cache coherence between memory and cache is critical.
 */
rt_weak sysret_t sys_cacheflush(void *addr, int size, int cache)
{
    if (!lwp_user_accessable(addr, size))
        return -EFAULT;

    if (((size_t)addr < (size_t)addr + size) &&
        ((size_t)addr >= USER_VADDR_START) &&
        ((size_t)addr + size < USER_VADDR_TOP))
    {
        if ((cache & DCACHE))
        {
            rt_hw_cpu_dcache_clean_and_invalidate(addr, size);
        }

        if ((cache & ICACHE))
        {
            rt_hw_cpu_icache_invalidate(addr, size);
        }

        return 0;
    }
    return -EFAULT;
}

/**
 * @brief Get system information.