panic() cleanup.

[minix.git] / drivers / dpeth / 8390.c

#include <assert.h>
/*
**  File:       8390.c          May  02, 2000
**
**  Author:     Giovanni Falzoni <gfalzoni@inwind.it>
**
**  This file contains an ethernet device driver for NICs
**  equipped with the National Semiconductor NS 8390 chip.
**  It has to be associated with the board specific driver.
**  Rewritten from Minix 2.0.0 ethernet driver dp8390.c
**  to extract the NS 8390 common functions.
**
**  $Id$
*/

#include "drivers.h"
#include <minix/com.h>
#include <net/gen/ether.h>
#include <net/gen/eth_io.h>
#include "dp.h"

#if (ENABLE_DP8390 == 1)

#define PIO16   0       /* NOTE: pio 16 functions missing */

#include "8390.h"

#if 0
#define sys_nic2mem(srcOffs,dstProc,dstOffs,length) \
        sys_vircopy(SELF,dep->de_memsegm,(vir_bytes)(srcOffs),\
                    (dstProc),D,(vir_bytes)(dstOffs),length)
#endif
#if 0
#define sys_user2nic_s(srcProc,grant,dstOffs,length) \
        sys_safecopyfrom((srcProc),(grant),0, \
                    (vir_bytes)(dstOffs),length,dep->de_memsegm)
#endif

static char RdmaErrMsg[] = "remote dma failed to complete";

/*
**  Name:       void ns_rw_setup(dpeth_t *dep, int mode, int size, u16_t offset);
**  Function:   Sets the board for reading/writing.
*/
static void ns_rw_setup(dpeth_t *dep, int mode, int size, u16_t offset)
{

  if (mode == CR_DM_RW) outb_reg0(dep, DP_ISR, ISR_RDC);
  outb_reg0(dep, DP_RBCR0, size & 0xFF);
  outb_reg0(dep, DP_RBCR1, (size >> 8) & 0xFF);
  outb_reg0(dep, DP_RSAR0, offset & 0xFF);
  outb_reg0(dep, DP_RSAR1, (offset >> 8) & 0xFF);
  mode |= (CR_PS_P0 | CR_STA);
  outb_reg0(dep, DP_CR, mode);
  return;
}

/*
**  Name:       void ns_start_xmit(dpeth_t *dep, int size, int pageno);
**  Function:   Sets the board for for transmitting and fires it.
*/
static void ns_start_xmit(dpeth_t * dep, int size, int pageno)
{

  outb_reg0(dep, DP_TPSR, pageno);
  outb_reg0(dep, DP_TBCR1, size >> 8);
  outb_reg0(dep, DP_TBCR0, size & 0xFF);
  outb_reg0(dep, DP_CR, CR_NO_DMA | CR_STA | CR_TXP);   /* Fires transmission */
  return;
}

/*
**  Name:       void mem_getblock(dpeth_t *dep, u16_t offset,
**                              int size, void *dst)
**  Function:   Reads a block of packet from board (shared memory).
*/
static void mem_getblock(dpeth_t *dep, u16_t offset, int size, void *dst)
{
  panic("mem_getblock: not converted to safecopies");
#if 0
  sys_nic2mem(dep->de_linmem + offset, SELF, dst, size);
  return;
#endif
}

/*
**  Name:       void mem_nic2user(dpeth_t *dep, int pageno, int pktsize);
**  Function:   Copies a packet from board to user area (shared memory).
*/
static void mem_nic2user(dpeth_t * dep, int pageno, int pktsize)
{
  phys_bytes offset;
  iovec_dat_s_t *iovp = &dep->de_read_iovec;
  int bytes, ix = 0;

  panic("mem_nic2user: not converted to safecopies");
#if 0

  /* Computes shared memory address (skipping receive header) */
  offset = pageno * DP_PAGESIZE + sizeof(dp_rcvhdr_t);

  do {                          /* Reads chuncks of packet into user area */

        bytes = iovp->iod_iovec[ix].iov_size;   /* Size of a chunck */
        if (bytes > pktsize) bytes = pktsize;

        /* Reads from board to user area */
        if ((offset + bytes) > (dep->de_stoppage * DP_PAGESIZE)) {

                /* Circular buffer wrap-around */
                bytes = dep->de_stoppage * DP_PAGESIZE - offset;
                sys_nic2mem_s(dep->de_linmem + offset, iovp->iod_proc_nr,
                            iovp->iod_iovec[ix].iov_grant, bytes);
                pktsize -= bytes;
                phys_user += bytes;
                bytes = iovp->iod_iovec[ix].iov_size - bytes;
                if (bytes > pktsize) bytes = pktsize;
                offset = dep->de_startpage * DP_PAGESIZE;
        }
        sys_nic2mem_s(dep->de_linmem + offset, iovp->iod_proc_nr,
                    iovp->iod_iovec[ix].iov_grant, bytes);
        offset += bytes;

        if (++ix >= IOVEC_NR) { /* Next buffer of IO vector */
                dp_next_iovec(iovp);
                ix = 0;
        }
        /* Till packet done */
  } while ((pktsize -= bytes) > 0);
  return;
#endif
}

/*
**  Name:       void mem_user2nic(dpeth_t *dep, int pageno, int pktsize)
**  Function:   Copies a packet from user area to board (shared memory).
*/
static void mem_user2nic(dpeth_t *dep, int pageno, int pktsize)
{
  phys_bytes offset, phys_user;
  iovec_dat_s_t *iovp = &dep->de_write_iovec;
  int bytes, ix = 0;

  panic("mem_user2nic: not converted to safecopies");
#if 0

  /* Computes shared memory address */
  offset = pageno * DP_PAGESIZE;

  do {                          /* Reads chuncks of packet from user area */

        bytes = iovp->iod_iovec[ix].iov_size;   /* Size of chunck */
        if (bytes > pktsize) bytes = pktsize;

        /* Reads from user area to board (shared memory) */
        sys_user2nic_s(iovp->iod_proc_nr, iovp->iod_iovec[ix].iov_grant, 
                     dep->de_linmem + offset, bytes);
        offset += bytes;

        if (++ix >= IOVEC_NR) { /* Next buffer of IO vector */
                dp_next_iovec(iovp);
                ix = 0;
        }
        /* Till packet done */
  } while ((pktsize -= bytes) > 0);
  return;
#endif
}

/*
**  Name:       void pio_getblock(dpeth_t *dep, u16_t offset,
**                              int size, void *dst)
**  Function:   Reads a block of packet from board (Prog. I/O).
*/
static void pio_getblock(dpeth_t *dep, u16_t offset, int size, void *dst)
{

  /* Sets up board for reading */
  ns_rw_setup(dep, CR_DM_RR, size, offset);

#if PIO16 == 0
  insb(dep->de_data_port, SELF, dst, size);
#else
  if (dep->de_16bit == TRUE) {
        insw(dep->de_data_port, dst, size);
  } else {
        insb(dep->de_data_port, dst, size);
  }
#endif
  return;
}

/*
**  Name:       void pio_nic2user(dpeth_t *dep, int pageno, int pktsize)
**  Function:   Copies a packet from board to user area (Prog. I/O).
*/
static void pio_nic2user(dpeth_t *dep, int pageno, int pktsize)
{
  iovec_dat_s_t *iovp = &dep->de_read_iovec;
  unsigned offset, iov_offset; int r, bytes, ix = 0;

  /* Computes memory address (skipping receive header) */
  offset = pageno * DP_PAGESIZE + sizeof(dp_rcvhdr_t);
  /* Sets up board for reading */
  ns_rw_setup(dep, CR_DM_RR, ((offset + pktsize) > (dep->de_stoppage * DP_PAGESIZE)) ?
        (dep->de_stoppage * DP_PAGESIZE) - offset : pktsize, offset);

  iov_offset= 0;
  do {                          /* Reads chuncks of packet into user area */

        bytes = iovp->iod_iovec[ix].iov_size;   /* Size of a chunck */
        if (bytes > pktsize) bytes = pktsize;

        if ((offset + bytes) > (dep->de_stoppage * DP_PAGESIZE)) {

                /* Circular buffer wrap-around */
                bytes = dep->de_stoppage * DP_PAGESIZE - offset;
                r= sys_safe_insb(dep->de_data_port, iovp->iod_proc_nr, 
                        iovp->iod_iovec[ix].iov_grant, iov_offset, bytes);
                if (r != OK) {
                        panic("pio_nic2user: sys_safe_insb failed: %d",                                 r);
                }
                pktsize -= bytes;
                iov_offset += bytes;
                bytes = iovp->iod_iovec[ix].iov_size - bytes;
                if (bytes > pktsize) bytes = pktsize;
                offset = dep->de_startpage * DP_PAGESIZE;
                ns_rw_setup(dep, CR_DM_RR, pktsize, offset);
        }
        r= sys_safe_insb(dep->de_data_port, iovp->iod_proc_nr,
                iovp->iod_iovec[ix].iov_grant, iov_offset, bytes);
        if (r != OK)
                panic("pio_nic2user: sys_safe_insb failed: %d", r);
        offset += bytes;

        if (++ix >= IOVEC_NR) { /* Next buffer of IO vector */
                dp_next_iovec(iovp);
                ix = 0;
        }
        iov_offset= 0;
        /* Till packet done */
  } while ((pktsize -= bytes) > 0);
  return;
}

/*
**  Name:       void pio_user2nic(dpeth_t *dep, int pageno, int pktsize)
**  Function:   Copies a packet from user area to board (Prog. I/O).
*/
static void pio_user2nic(dpeth_t *dep, int pageno, int pktsize)
{
  iovec_dat_s_t *iovp = &dep->de_write_iovec;
  int r, bytes, ix = 0;

  /* Sets up board for writing */
  ns_rw_setup(dep, CR_DM_RW, pktsize, pageno * DP_PAGESIZE);
  
  do {                          /* Reads chuncks of packet from user area */

        bytes = iovp->iod_iovec[ix].iov_size;   /* Size of chunck */
        if (bytes > pktsize) bytes = pktsize;
        r= sys_safe_outsb(dep->de_data_port, iovp->iod_proc_nr,
              iovp->iod_iovec[ix].iov_grant, 0, bytes);
        if (r != OK)
                panic("pio_user2nic: sys_safe_outsb failed: %d", r);

        if (++ix >= IOVEC_NR) { /* Next buffer of I/O vector */
                dp_next_iovec(iovp);
                ix = 0;
        }
        /* Till packet done */
  } while ((pktsize -= bytes) > 0);

  for (ix = 0; ix < 100; ix += 1) {
        if (inb_reg0(dep, DP_ISR) & ISR_RDC) break;
  }
  if (ix == 100) {
        panic(RdmaErrMsg);
  }
  return;
}

/*
**  Name:       void ns_stats(dpeth_t * dep)
**  Function:   Updates counters reading from device
*/
static void ns_stats(dpeth_t * dep)
{

  dep->de_stat.ets_CRCerr += inb_reg0(dep, DP_CNTR0);
  dep->de_stat.ets_recvErr += inb_reg0(dep, DP_CNTR1);
  dep->de_stat.ets_fifoOver += inb_reg0(dep, DP_CNTR2);
  return;
}

/*
**  Name:       void ns_dodump(dpeth_t * dep)
**  Function:   Displays statistics (a request from F5 key).
*/
static void ns_dodump(dpeth_t * dep)
{

  ns_stats(dep);                /* Forces reading fo counters from board */
  return;
}

/*
**  Name:       void ns_reinit(dpeth_t *dep)
**  Function:   Updates receiver configuration.
*/
static void ns_reinit(dpeth_t * dep)
{
  int dp_reg = 0;

  if (dep->de_flags & DEF_PROMISC) dp_reg |= RCR_AB | RCR_PRO | RCR_AM;
  if (dep->de_flags & DEF_BROAD) dp_reg |= RCR_AB;
  if (dep->de_flags & DEF_MULTI) dp_reg |= RCR_AM;
  outb_reg0(dep, DP_CR, CR_PS_P0);
  outb_reg0(dep, DP_RCR, dp_reg);
  return;
}

/*
**  Name:       void ns_send(dpeth_t * dep, int from_int, int size)
**  Function:   Transfers packet to device and starts sending.
*/
static void ns_send(dpeth_t * dep, int from_int, int size)
{
  int queue;

  if (queue = dep->de_sendq_head, dep->de_sendq[queue].sq_filled) {
        if (from_int) panic("should not be sending ");
        dep->de_send_s = size;
        return;
  }
  (dep->de_user2nicf) (dep, dep->de_sendq[queue].sq_sendpage, size);
  dep->bytes_Tx += (long) size;
  dep->de_sendq[queue].sq_filled = TRUE;
  dep->de_flags |= (DEF_XMIT_BUSY | DEF_ACK_SEND);
  if (dep->de_sendq_tail == queue) {    /* there it goes.. */
        ns_start_xmit(dep, size, dep->de_sendq[queue].sq_sendpage);
  } else
        dep->de_sendq[queue].sq_size = size;

  if (++queue == dep->de_sendq_nr) queue = 0;
  dep->de_sendq_head = queue;
  dep->de_flags &= NOT(DEF_SENDING);

  return;
}

/*
**  Name:       void ns_reset(dpeth_t *dep)
**  Function:   Resets device.
*/
static void ns_reset(dpeth_t * dep)
{
  int ix;

  /* Stop chip */
  outb_reg0(dep, DP_CR, CR_STP | CR_NO_DMA);
  outb_reg0(dep, DP_RBCR0, 0);
  outb_reg0(dep, DP_RBCR1, 0);
  for (ix = 0; ix < 0x1000 && ((inb_reg0(dep, DP_ISR) & ISR_RST) == 0); ix += 1)
         /* Do nothing */ ;
  outb_reg0(dep, DP_TCR, TCR_1EXTERNAL | TCR_OFST);
  outb_reg0(dep, DP_CR, CR_STA | CR_NO_DMA);
  outb_reg0(dep, DP_TCR, TCR_NORMAL | TCR_OFST);

  /* Acknowledge the ISR_RDC (remote dma) interrupt. */
  for (ix = 0; ix < 0x1000 && ((inb_reg0(dep, DP_ISR) & ISR_RDC) == 0); ix += 1)
         /* Do nothing */ ;
  outb_reg0(dep, DP_ISR, inb_reg0(dep, DP_ISR) & NOT(ISR_RDC));

  /* Reset the transmit ring. If we were transmitting a packet, we
   * pretend that the packet is processed. Higher layers will
   * retransmit if the packet wasn't actually sent. */
  dep->de_sendq_head = dep->de_sendq_tail = 0;
  for (ix = 0; ix < dep->de_sendq_nr; ix++)
        dep->de_sendq[ix].sq_filled = FALSE;
  ns_send(dep, TRUE, dep->de_send_s);
  return;
}

/*
**  Name:       void ns_recv(dpeth_t *dep, int fromint, int size)
**  Function:   Gets a packet from device
*/
static void ns_recv(dpeth_t *dep, int fromint, int size)
{
  dp_rcvhdr_t header;
  dp_rcvhdr_t dummy;
  unsigned pageno, curr, next;
  vir_bytes length;
  int packet_processed = FALSE;
#ifdef ETH_IGN_PROTO
  u16_t eth_type;
#endif

  pageno = inb_reg0(dep, DP_BNRY) + 1;
  if (pageno == dep->de_stoppage) pageno = dep->de_startpage;

  do {
        /* */
        outb_reg0(dep, DP_CR, CR_PS_P1);
        curr = inb_reg1(dep, DP_CURR);
        outb_reg0(dep, DP_CR, CR_PS_P0 | CR_NO_DMA | CR_STA);

        if (curr == pageno) break;

        (dep->de_getblockf) (dep, pageno * DP_PAGESIZE, sizeof(header), &header);
#ifdef ETH_IGN_PROTO
        (dep->de_getblockf) (dep, pageno * DP_PAGESIZE + sizeof(header) + 2 * sizeof(ether_addr_t), sizeof(eth_type), &eth_type);
#endif
        length = (header.dr_rbcl | (header.dr_rbch << 8)) - sizeof(dp_rcvhdr_t);
        next = header.dr_next;

        if (length < ETH_MIN_PACK_SIZE || length > ETH_MAX_PACK_SIZE) {
                printf("%s: packet with strange length arrived: %d\n", dep->de_name, length);
                dep->de_stat.ets_recvErr += 1;
                next = curr;

        } else if (next < dep->de_startpage || next >= dep->de_stoppage) {
                printf("%s: strange next page\n", dep->de_name);
                dep->de_stat.ets_recvErr += 1;
                next = curr;

#ifdef ETH_IGN_PROTO
        } else if (eth_type == eth_ign_proto) {
                /* Hack: ignore packets of a given protocol */
                static int first = TRUE;
                if (first) {
                        first = FALSE;
                        printf("%s: dropping proto %04x packet\n", dep->de_name, ntohs(eth_ign_proto));
                }
                next = curr;
#endif
        } else if (header.dr_status & RSR_FO) {
                /* This is very serious, issue a warning and reset buffers */
                printf("%s: fifo overrun, resetting receive buffer\n", dep->de_name);
                dep->de_stat.ets_fifoOver += 1;
                next = curr;

        } else if ((header.dr_status & RSR_PRX) && (dep->de_flags & DEF_ENABLED)) {

                if (!(dep->de_flags & DEF_READING)) break;

                (dep->de_nic2userf) (dep, pageno, length);
                dep->de_read_s = length;
                dep->de_flags |= DEF_ACK_RECV;
                dep->de_flags &= NOT(DEF_READING);
                packet_processed = TRUE;
        }
        dep->bytes_Rx += (long) length;
        dep->de_stat.ets_packetR += 1;
        outb_reg0(dep, DP_BNRY, (next == dep->de_startpage ? dep->de_stoppage : next) - 1);
        pageno = next;

  } while (!packet_processed);
#if 0
  if ((dep->de_flags & (DEF_READING | DEF_STOPPED)) == (DEF_READING | DEF_STOPPED))
        /* The chip is stopped, and all arrived packets delivered */
        (*dep->de_resetf) (dep);
  dep->de_flags &= NOT(DEF_STOPPED);
#endif
  return;
}

/*
**  Name:       void ns_interrupt(dpeth_t * dep)
**  Function:   Handles interrupt.
*/
static void ns_interrupt(dpeth_t * dep)
{
  int isr, tsr;
  int queue;

  while ((isr = inb_reg0(dep, DP_ISR)) != 0) {

        outb_reg0(dep, DP_ISR, isr);
        if (isr & (ISR_PTX | ISR_TXE)) {

                tsr = inb_reg0(dep, DP_TSR);
                if (tsr & TSR_PTX) {
                        dep->de_stat.ets_packetT++;
                }
                if (tsr & TSR_COL) dep->de_stat.ets_collision++;
                if (tsr & (TSR_ABT | TSR_FU)) {
                        dep->de_stat.ets_fifoUnder++;
                }
                if ((isr & ISR_TXE) || (tsr & (TSR_CRS | TSR_CDH | TSR_OWC))) {
                        printf("%s: got send Error (0x%02X)\n", dep->de_name, tsr);
                        dep->de_stat.ets_sendErr++;
                }
                queue = dep->de_sendq_tail;

                if (!(dep->de_sendq[queue].sq_filled)) {        /* Hardware bug? */
                        printf("%s: transmit interrupt, but not sending\n", dep->de_name);
                        continue;
                }
                dep->de_sendq[queue].sq_filled = FALSE;
                if (++queue == dep->de_sendq_nr) queue = 0;
                dep->de_sendq_tail = queue;
                if (dep->de_sendq[queue].sq_filled) {
                        ns_start_xmit(dep, dep->de_sendq[queue].sq_size,
                                dep->de_sendq[queue].sq_sendpage);
                }
                if (dep->de_flags & DEF_SENDING) {
                        ns_send(dep, TRUE, dep->de_send_s);
                }
        }
        if (isr & ISR_PRX) {
                ns_recv(dep, TRUE, 0);
        }
        if (isr & ISR_RXE) {
                printf("%s: got recv Error (0x%04X)\n", dep->de_name, inb_reg0(dep, DP_RSR));
                dep->de_stat.ets_recvErr++;
        }
        if (isr & ISR_CNT) {
                dep->de_stat.ets_CRCerr += inb_reg0(dep, DP_CNTR0);
                dep->de_stat.ets_recvErr += inb_reg0(dep, DP_CNTR1);
                dep->de_stat.ets_fifoOver += inb_reg0(dep, DP_CNTR2);
        }
        if (isr & ISR_OVW) {
                printf("%s: got overwrite warning\n", dep->de_name);
        }
        if (isr & ISR_RDC) {
                /* Nothing to do */
        }
        if (isr & ISR_RST) {
                /* This means we got an interrupt but the ethernet
                 * chip is shutdown. We set the flag DEF_STOPPED, and
                 * continue processing arrived packets. When the
                 * receive buffer is empty, we reset the dp8390. */
                printf("%s: network interface stopped\n", dep->de_name);
                dep->de_flags |= DEF_STOPPED;
                break;
        }
  }
  if ((dep->de_flags & (DEF_READING | DEF_STOPPED)) == (DEF_READING | DEF_STOPPED)) {

        /* The chip is stopped, and all arrived packets delivered */
        ns_reset(dep);
        dep->de_flags &= NOT(DEF_STOPPED);
  }
  return;
}

/*
**  Name:       void ns_init(dpeth_t *dep)
**  Function:   Initializes the NS 8390
*/
void ns_init(dpeth_t * dep)
{
  int dp_reg;
  int ix;

  /* NS8390 initialization (as recommended in National Semiconductor specs) */
  outb_reg0(dep, DP_CR, CR_PS_P0 | CR_STP | CR_NO_DMA); /* 0x21 */
#if PIO16 == 0
  outb_reg0(dep, DP_DCR, (DCR_BYTEWIDE | DCR_LTLENDIAN | DCR_8BYTES | DCR_BMS));
#else
  outb_reg0(dep, DP_DCR, (((dep->de_16bit) ? DCR_WORDWIDE : DCR_BYTEWIDE) |
                        DCR_LTLENDIAN | DCR_8BYTES | DCR_BMS));
#endif
  outb_reg0(dep, DP_RBCR0, 0);
  outb_reg0(dep, DP_RBCR1, 0);
  outb_reg0(dep, DP_RCR, RCR_MON);      /* Sets Monitor mode */
  outb_reg0(dep, DP_TCR, TCR_INTERNAL); /* Sets Loopback mode 1 */
  outb_reg0(dep, DP_PSTART, dep->de_startpage);
  outb_reg0(dep, DP_PSTOP, dep->de_stoppage);
  outb_reg0(dep, DP_BNRY, dep->de_stoppage - 1);
  outb_reg0(dep, DP_ISR, 0xFF); /* Clears Interrupt Status Register */
  outb_reg0(dep, DP_IMR, 0);    /* Clears Interrupt Mask Register */

  /* Copies station address in page 1 registers */
  outb_reg0(dep, DP_CR, CR_PS_P1 | CR_NO_DMA);  /* Selects Page 1 */
  for (ix = 0; ix < SA_ADDR_LEN; ix += 1)       /* Initializes address */
        outb_reg1(dep, DP_PAR0 + ix, dep->de_address.ea_addr[ix]);
  for (ix = DP_MAR0; ix <= DP_MAR7; ix += 1)    /* Initializes address */
        outb_reg1(dep, ix, 0xFF);

  outb_reg1(dep, DP_CURR, dep->de_startpage);
  outb_reg1(dep, DP_CR, CR_PS_P0 | CR_NO_DMA);  /* Selects Page 0 */

  inb_reg0(dep, DP_CNTR0);      /* Resets counters by reading them */
  inb_reg0(dep, DP_CNTR1);
  inb_reg0(dep, DP_CNTR2);

  dp_reg = IMR_PRXE | IMR_PTXE | IMR_RXEE | IMR_TXEE | IMR_OVWE | IMR_CNTE;
  outb_reg0(dep, DP_ISR, 0xFF); /* Clears Interrupt Status Register */
  outb_reg0(dep, DP_IMR, dp_reg);       /* Sets Interrupt Mask register */

  dp_reg = 0;
  if (dep->de_flags & DEF_PROMISC) dp_reg |= RCR_AB | RCR_PRO | RCR_AM;
  if (dep->de_flags & DEF_BROAD) dp_reg |= RCR_AB;
  if (dep->de_flags & DEF_MULTI) dp_reg |= RCR_AM;
  outb_reg0(dep, DP_RCR, dp_reg);       /* Sets receive as requested */
  outb_reg0(dep, DP_TCR, TCR_NORMAL);   /* Sets transmitter */

  outb_reg0(dep, DP_CR, CR_STA | CR_NO_DMA);    /* Starts board */

  /* Initializes the send queue. */
  for (ix = 0; ix < dep->de_sendq_nr; ix += 1)
        dep->de_sendq[ix].sq_filled = 0;
  dep->de_sendq_head = dep->de_sendq_tail = 0;

  /* Device specific functions */
  if (!dep->de_prog_IO) {
        dep->de_user2nicf = mem_user2nic;
        dep->de_nic2userf = mem_nic2user;
        dep->de_getblockf = mem_getblock;
  } else {
#if PIO16 == 0
        dep->de_user2nicf = pio_user2nic;
        dep->de_nic2userf = pio_nic2user;
        dep->de_getblockf = pio_getblock;
#else
#error  Missing I/O functions for pio 16 bits
#endif
  }
  dep->de_recvf = ns_recv;
  dep->de_sendf = ns_send;
  dep->de_flagsf = ns_reinit;
  dep->de_resetf = ns_reset;
  dep->de_getstatsf = ns_stats;
  dep->de_dumpstatsf = ns_dodump;
  dep->de_interruptf = ns_interrupt;

  return;                       /* Done */
}

#if PIO16 == 1

/*
**  Name:       void dp_pio16_user2nic(dpeth_t *dep, int pageno, int pktsize)
**  Function:   Copies a packet from user area to board (Prog. I/O, 16bits).
*/
static void dp_pio16_user2nic(dpeth_t *dep, int pageno, int pktsize)
{
  u8_t two_bytes[2];
  phys_bytes phys_user, phys_2bytes = vir2phys(two_bytes);
  vir_bytes ecount = (pktsize + 1) & NOT(0x0001);
  int bytes, ix = 0, odd_byte = 0;
  iovec_dat_t *iovp = &dep->de_write_iovec;

  outb_reg0(dep, DP_ISR, ISR_RDC);
  dp_read_setup(dep, ecount, pageno * DP_PAGESIZE);

  do {
        bytes = iovp->iod_iovec[ix].iov_size;
        if (bytes > pktsize) bytes = pktsize;

        phys_user = numap(iovp->iod_proc_nr, iovp->iod_iovec[ix].iov_addr, bytes);
        if (!phys_user) panic(UmapErrMsg);

        if (odd_byte) {
                phys_copy(phys_user, phys_2bytes + 1, (phys_bytes) 1);
                out_word(dep->de_data_port, *(u16_t *)two_bytes);
                pktsize--;
                bytes--;
                phys_user++;
                odd_byte = 0;
                if (!bytes) continue;
        }
        ecount = bytes & NOT(0x0001);
        if (ecount != 0) {
                phys_outsw(dep->de_data_port, phys_user, ecount);
                pktsize -= ecount;
                bytes -= ecount;
                phys_user += ecount;
        }
        if (bytes) {
                phys_copy(phys_user, phys_2bytes, (phys_bytes) 1);
                pktsize--;
                bytes--;
                phys_user++;
                odd_byte = 1;
        }
        if (++ix >= IOVEC_NR) { /* Next buffer of I/O vector */
                dp_next_iovec(iovp);
                ix = 0;
        }

  }  while (bytes > 0);

  if (odd_byte) out_word(dep->de_data_port, *(u16_t *) two_bytes);
  for (ix = 0; ix < 100; ix++) {
        if (inb_reg0(dep, DP_ISR) & ISR_RDC) break;
  }
  if (ix == 100) {
        panic(RdmaErrMsg);
  }
  return;
}

/*
**  Name:       void dp_pio16_nic2user(dpeth_t *dep, int pageno, int pktsize)
**  Function:   Copies a packet from board to user area (Prog. I/O, 16bits).
*/
static void dp_pio16_nic2user(dpeth_t * dep, int nic_addr, int count)
{
  phys_bytes phys_user;
  vir_bytes ecount;
  int bytes, i;
  u8_t two_bytes[2];
  phys_bytes phys_2bytes;
  int odd_byte;

  ecount = (count + 1) & ~1;
  phys_2bytes = vir2phys(two_bytes);
  odd_byte = 0;

  dp_read_setup(dep, ecount, nic_addr);

  i = 0;
  while (count > 0) {
        if (i >= IOVEC_NR) {
                dp_next_iovec(iovp);
                i = 0;
                continue;
        }
        bytes = iovp->iod_iovec[i].iov_size;
        if (bytes > count) bytes = count;

        phys_user = numap(iovp->iod_proc_nr,
                          iovp->iod_iovec[i].iov_addr, bytes);
        if (!phys_user) panic(UmapErrMsg);
        if (odd_byte) {
                phys_copy(phys_2bytes + 1, phys_user, (phys_bytes) 1);
                count--;
                bytes--;
                phys_user++;
                odd_byte = 0;
                if (!bytes) continue;
        }
        ecount = bytes & ~1;
        if (ecount != 0) {
                phys_insw(dep->de_data_port, phys_user, ecount);
                count -= ecount;
                bytes -= ecount;
                phys_user += ecount;
        }
        if (bytes) {
                *(u16_t *) two_bytes = in_word(dep->de_data_port);
                phys_copy(phys_2bytes, phys_user, (phys_bytes) 1);
                count--;
                bytes--;
                phys_user++;
                odd_byte = 1;
        }
  }
  return;
}

#endif                          /* PIO16 == 1 */

#endif                          /* ENABLE_DP8390 */

/** end 8390.c **/