mips_sys

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#include "eth.h"
static volatile unsigned int *const eth_ptr =
  (volatile unsigned int *)0x80000400;
static unsigned int eth_idx_hw;
static unsigned int eth_rx_buf[2][256];
static unsigned int *eth_rx_pos;
/**
 * @brief provide new receive buffer
 * @param[in] ptr pointer to new receive buffer
 * @param[in] sz size of new receive buffer
 */
static void eth_rx_new_buf(void *ptr, unsigned int sz)
{
  eth_ptr[4] = (unsigned int)ptr; /* new start */
  eth_ptr[5] = (unsigned int)ptr + sz; /* new end */
  eth_ptr[6] = 1; /* set flag */
  while (eth_ptr[6] == 1); /* wait until processed */
}
/**
 * @brief get buffer position of ethernet receiver
 * @return current buffer position of ethernet receiver
 *
 * eveything before this position can be read
 */
static void * eth_rx_get_pos(void)
{
  return (void *)eth_ptr[0];
}
/** initialize receiver */
void eth_rx_init(void)
{
  // give buffer 0 to HW
  eth_idx_hw = 0;
  eth_rx_new_buf(eth_rx_buf[0], sizeof(eth_rx_buf[0]));
  // buffer 1 owned by SW is empty
  eth_rx_buf[1][0] = 0;
  eth_rx_pos = eth_rx_buf[1];
}
/**
 * @brief get next received packet
 * @param[out] *pptr pointer to packet data
 * @param[out] *psz size of packet
 * @return if a packet was received
 */
int eth_rx(void **pptr, unsigned int *psz)
 
 
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