division operation

Considering that there's no division in the LANai instruction set, I
find interesting that in the file gmcp.c, part of the mcp code uses
divisions. Anybody knows why is that? 

In particular, here's part of the code:

static inline void
gm_ethernet_addr_table_set (unsigned int node_id, gm_u8_t *addr)
{
  gm_dp_t entry_logical_addr;
  gm_dp_t piece;

  /* compute logical address of addr table entry, aborting if not possible. */
  piece = gm.ethernet.addr_table_piece[node_id / (GM_PAGE_LEN / 8)];

  /* Catch case where MCP supports ethernet, but host does not */
  if (!piece)
    return;

  entry_logical_addr = piece + 8 * (node_id % (GM_PAGE_LEN / 8));

  /* Copy the ethernet address to a known 8-byte aligned buffer with
     the last two bytes cleared. */
  ether_addr_copy (addr, gm.ethernet.addr_stage);
  gm.ethernet.addr_stage[6] = gm.ethernet.addr_stage[7] = 0;

  /* wait for DMA engine to be free */
  await_free_DMA_engine ();

  /* DMA the address to the host. */
  start_RDMA (&gm.ethernet.addr_stage,
	      entry_logical_addr,
	      8);
}

Any comments are appreciated. 
Thanks. 

-- 
Edgar A. León

(:)-) likes to scuba dive