Function bounce_buffer_start

src/commonlib/storage/bouncebuf.c:32–59

}

int bounce_buffer_start(struct bounce_buffer *state, void *data,
			size_t len, unsigned int flags)
{
	state->user_buffer = data;
	state->bounce_buffer = data;
	state->len = len;
	state->len_aligned = ROUND(len, ARCH_DMA_MINALIGN);
	state->flags = flags;

	if (!addr_aligned(state)) {
		state->bounce_buffer = memalign(ARCH_DMA_MINALIGN,
						state->len_aligned);
		if (!state->bounce_buffer)
			return -1;

		if (state->flags & GEN_BB_READ)
			memcpy(state->bounce_buffer, state->user_buffer,
				state->len);
	}

	/*
	 * Flush data to RAM so DMA reads can pick it up,
	 * and any CPU writebacks don't race with DMA writes
	 */
	dcache_clean_invalidate_by_mva(state->bounce_buffer,
				       state->len_aligned);
	return 0;
}

int bounce_buffer_stop(struct bounce_buffer *state)
{