Function dma_pool_install

components/drivers/dma/dma_pool.c:508–562

}

static struct rt_dma_pool *dma_pool_install(rt_region_t *region)
{
    rt_err_t err;
    struct rt_dma_pool *pool;

    if (!(pool = rt_calloc(1, sizeof(*pool))))
    {
        LOG_E("Install pool[%p, %p] error = %s",
                region->start, region->end, rt_strerror(-RT_ENOMEM));

        return RT_NULL;
    }

    rt_memcpy(&pool->region, region, sizeof(*region));

    pool->flags |= RT_DMA_F_LINEAR;

    if (region->end < 4UL * SIZE_GB)
    {
        pool->flags |= RT_DMA_F_32BITS;
    }

    pool->start = RT_ALIGN(pool->region.start, ARCH_PAGE_SIZE);
    pool->bits = (pool->region.end - pool->start) / ARCH_PAGE_SIZE;

    if (!pool->bits)
    {
        err = -RT_EINVAL;
        goto _fail;
    }

    pool->map = rt_calloc(RT_BITMAP_LEN(pool->bits), sizeof(*pool->map));

    if (!pool->map)
    {
        err = -RT_ENOMEM;
        goto _fail;
    }

    rt_list_init(&pool->list);

    region_pool_lock();
    rt_list_insert_before(&dma_pool_nodes, &pool->list);
    region_pool_unlock();

    return pool;

_fail:
    rt_free(pool);

    LOG_E("Install pool[%p, %p] error = %s",
            region->start, region->end, rt_strerror(err));

    return RT_NULL;
}

struct rt_dma_pool *rt_dma_pool_install(rt_region_t *region)
{