Function page_read

components/dfs/dfs_v2/src/dfs_file_mmap.c:259–284

* @brief Read data from memory mapped file page * * @param[in] varea Pointer to the virtual memory area structure * @param[in,out] msg Pointer to the I/O message structure * - Input: Contains read request information * - Output: Contains response status and read data * * @note This function handles page read operations for memory mapped files. * If

 *       If the read size is less than page size, it zero-fills the remaining space.
 */
void page_read(struct rt_varea *varea, struct rt_aspace_io_msg *msg)
{
    rt_ubase_t ret;
    struct dfs_file *file = dfs_mem_obj_get_file(varea->mem_obj);

    if (file)
    {
        LOG_I("%s varea: %p", __func__, varea);
        LOG_I("varea start: %p size: 0x%x offset: 0x%x attr: 0x%x flag: 0x%x",
               varea->start, varea->size, varea->offset, varea->attr, varea->flag);

        ret = dfs_aspace_mmap_read(file, varea, msg);
        if (ret >= 0)
        {
            msg->response.status = MM_FAULT_STATUS_OK;
            if (ret < ARCH_PAGE_SIZE)
            {
                memset((char *)msg->buffer_vaddr + ret, 0, ARCH_PAGE_SIZE - ret);
            }
        }
    }
    else
    {
        LOG_E("%s varea %p not a file, vaddr %p", __func__, varea, varea->start);
    }
}

/**
 * @brief Write data to memory mapped file page