lwIP related work.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1173 35acf78f-673a-0410-8e92-d51de3d6d3f4

6 files changed, 759 insertions, 0 deletions

diff --git a/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/cc.h b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/cc.h
new file mode 100644
index 000000000..f8e120315
--- /dev/null
+++ b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/cc.h
@@ -0,0 +1,73 @@
+/*

+    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.

+

+    This file is part of ChibiOS/RT.

+

+    ChibiOS/RT is free software; you can redistribute it and/or modify

+    it under the terms of the GNU General Public License as published by

+    the Free Software Foundation; either version 3 of the License, or

+    (at your option) any later version.

+

+    ChibiOS/RT is distributed in the hope that it will be useful,

+    but WITHOUT ANY WARRANTY; without even the implied warranty of

+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+    GNU General Public License for more details.

+

+    You should have received a copy of the GNU General Public License

+    along with this program.  If not, see <http://www.gnu.org/licenses/>.

+*/

+/*

+    **** This file incorporates work covered by the following copyright and ****

+    **** permission notice:                                                 ****

+

+    Copyright (c) 2001-2004 Swedish Institute of Computer Science.

+    All rights reserved.

+

+    Redistribution and use in source and binary forms, with or without modification,

+    are permitted provided that the following conditions are met:

+

+    1. Redistributions of source code must retain the above copyright notice,

+       this list of conditions and the following disclaimer.

+    2. Redistributions in binary form must reproduce the above copyright notice,

+       this list of conditions and the following disclaimer in the documentation

+       and/or other materials provided with the distribution.

+    3. The name of the author may not be used to endorse or promote products

+       derived from this software without specific prior written permission.

+

+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

+    WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

+    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

+    SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

+    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT

+    OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

+    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY

+    OF SUCH DAMAGE.

+

+    This file is part of the lwIP TCP/IP stack.

+

+    Author: Adam Dunkels <adam@sics.se>

+*/

+

+#ifndef __CC_H__

+#define __CC_H__

+

+#include <ch.h>

+

+typedef uint8_t         u8_t;

+typedef int8_t          s8_t;

+typedef uint16_t        u16_t;

+typedef int16_t         s16_t;

+typedef uint32_t        u32_t;

+typedef int32_t         s32_t;

+typedef uint32_t        mem_ptr_t;

+

+#define LWIP_PLATFORM_DIAG(x)

+#define LWIP_PLATFORM_ASSERT(x) {                                       \

+  chSysHalt();                                                          \

+}

+

+#define BYTE_ORDER LITTLE_ENDIAN

+

+#endif /* __CC_H__ */

diff --git a/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/perf.h b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/perf.h
new file mode 100644
index 000000000..c6f1d1a90
--- /dev/null
+++ b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/perf.h
@@ -0,0 +1,59 @@
+/*

+    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.

+

+    This file is part of ChibiOS/RT.

+

+    ChibiOS/RT is free software; you can redistribute it and/or modify

+    it under the terms of the GNU General Public License as published by

+    the Free Software Foundation; either version 3 of the License, or

+    (at your option) any later version.

+

+    ChibiOS/RT is distributed in the hope that it will be useful,

+    but WITHOUT ANY WARRANTY; without even the implied warranty of

+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+    GNU General Public License for more details.

+

+    You should have received a copy of the GNU General Public License

+    along with this program.  If not, see <http://www.gnu.org/licenses/>.

+*/

+/*

+    **** This file incorporates work covered by the following copyright and ****

+    **** permission notice:                                                 ****

+

+    Copyright (c) 2001-2004 Swedish Institute of Computer Science.

+    All rights reserved.

+

+    Redistribution and use in source and binary forms, with or without modification,

+    are permitted provided that the following conditions are met:

+

+    1. Redistributions of source code must retain the above copyright notice,

+       this list of conditions and the following disclaimer.

+    2. Redistributions in binary form must reproduce the above copyright notice,

+       this list of conditions and the following disclaimer in the documentation

+       and/or other materials provided with the distribution.

+    3. The name of the author may not be used to endorse or promote products

+       derived from this software without specific prior written permission.

+

+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

+    WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

+    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

+    SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

+    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT

+    OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

+    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY

+    OF SUCH DAMAGE.

+

+    This file is part of the lwIP TCP/IP stack.

+

+    Author: Adam Dunkels <adam@sics.se>

+*/

+

+#ifndef __PERF_H__

+#define __PERF_H__

+

+#define PERF_START

+#define PERF_STOP(x)

+

+#endif /* __PERF_H__ */

diff --git a/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/sys_arch.c b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/sys_arch.c
new file mode 100644
index 000000000..8248eed72
--- /dev/null
+++ b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/sys_arch.c
@@ -0,0 +1,159 @@
+/*

+    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.

+

+    This file is part of ChibiOS/RT.

+

+    ChibiOS/RT is free software; you can redistribute it and/or modify

+    it under the terms of the GNU General Public License as published by

+    the Free Software Foundation; either version 3 of the License, or

+    (at your option) any later version.

+

+    ChibiOS/RT is distributed in the hope that it will be useful,

+    but WITHOUT ANY WARRANTY; without even the implied warranty of

+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+    GNU General Public License for more details.

+

+    You should have received a copy of the GNU General Public License

+    along with this program.  If not, see <http://www.gnu.org/licenses/>.

+*/

+/*

+    **** This file incorporates work covered by the following copyright and ****

+    **** permission notice:                                                 ****

+

+    Copyright (c) 2001-2004 Swedish Institute of Computer Science.

+    All rights reserved.

+

+    Redistribution and use in source and binary forms, with or without modification,

+    are permitted provided that the following conditions are met:

+

+    1. Redistributions of source code must retain the above copyright notice,

+       this list of conditions and the following disclaimer.

+    2. Redistributions in binary form must reproduce the above copyright notice,

+       this list of conditions and the following disclaimer in the documentation

+       and/or other materials provided with the distribution.

+    3. The name of the author may not be used to endorse or promote products

+       derived from this software without specific prior written permission.

+

+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

+    WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

+    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

+    SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

+    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT

+    OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

+    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY

+    OF SUCH DAMAGE.

+

+    This file is part of the lwIP TCP/IP stack.

+

+    Author: Adam Dunkels <adam@sics.se>

+*/

+

+#include <ch.h>

+

+#include "lwip/opt.h"

+#include "lwip/mem.h"

+#include "lwip/sys.h"

+

+#include "arch/cc.h"

+#include "arch/sys_arch.h"

+

+static unsigned cnt;

+

+void sys_init(void) {

+

+  cnt = 0;

+}

+

+sys_sem_t sys_sem_new(u8_t count) {

+

+  sys_sem_t sem = mem_malloc(sizeof(Semaphore));

+  chSemInit(sem, (cnt_t)count);

+  return sem;

+}

+

+void sys_sem_free(sys_sem_t sem) {

+

+  mem_free(sem);

+}

+

+void sys_sem_signal(sys_sem_t sem) {

+

+  chSemSignal(sem);

+}

+

+u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout) {

+  systime_t time;

+

+  chSysLock();

+  time = chTimeNow();

+  chSemWaitTimeoutS(sem, (systime_t)timeout);

+  time = chTimeNow() - time;

+  chSysUnlock();

+  return time;

+}

+

+sys_mbox_t sys_mbox_new(int size) {

+  sys_mbox_t mbox;

+

+  mbox = mem_malloc(sizeof(Mailbox) + sizeof(msg_t) * size);

+  chMBInit(mbox, (void *)(mbox + 1), size);

+  return mbox;

+}

+

+void sys_mbox_free(sys_mbox_t mbox) {

+

+  mem_free(mbox);

+}

+

+void sys_mbox_post(sys_mbox_t mbox, void *msg) {

+

+  chMBPost(mbox, (msg_t)msg, TIME_INFINITE);

+}

+

+err_t sys_mbox_trypost(sys_mbox_t mbox, void *msg) {

+

+  if (chMBPost(mbox, (msg_t)msg, TIME_IMMEDIATE) == RDY_TIMEOUT)

+    return ERR_MEM;

+  return ERR_OK;

+}

+

+u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout) {

+

+  if (chMBFetchS(mbox, (msg_t *)msg, (systime_t)timeout) == RDY_TIMEOUT)

+    return ERR_MEM;

+  return ERR_OK;

+}

+

+u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void **msg) {

+

+  if (chMBFetchS(mbox, (msg_t *)msg, TIME_IMMEDIATE) == RDY_TIMEOUT)

+    return ERR_MEM;

+  return ERR_OK;

+}

+

+struct sys_timeouts *sys_arch_timeouts(void) {

+

+  return (struct sys_timeouts *)&currp->p_timeouts;

+}

+

+sys_thread_t sys_thread_new(char *name, void (* thread)(void *arg),

+                            void *arg, int stacksize, int prio) {

+  size_t wsz = THD_WA_SIZE(stacksize);

+  void *wsp = mem_malloc(wsz);

+  if (wsp == NULL)

+    return NULL;

+  return (sys_thread_t)chThdCreateStatic(wsp, wsz, prio, (tfunc_t)thread, arg);

+}

+

+sys_prot_t sys_arch_protect(void) {

+

+  chSysLock();

+  return 0;

+}

+

+void sys_arch_unprotect(sys_prot_t pval) {

+

+  chSysUnlock();

+}

diff --git a/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/sys_arch.h b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/sys_arch.h
new file mode 100644
index 000000000..6dd834506
--- /dev/null
+++ b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/arch/sys_arch.h
@@ -0,0 +1,91 @@
+/*

+    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.

+

+    This file is part of ChibiOS/RT.

+

+    ChibiOS/RT is free software; you can redistribute it and/or modify

+    it under the terms of the GNU General Public License as published by

+    the Free Software Foundation; either version 3 of the License, or

+    (at your option) any later version.

+

+    ChibiOS/RT is distributed in the hope that it will be useful,

+    but WITHOUT ANY WARRANTY; without even the implied warranty of

+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+    GNU General Public License for more details.

+

+    You should have received a copy of the GNU General Public License

+    along with this program.  If not, see <http://www.gnu.org/licenses/>.

+*/

+/*

+    **** This file incorporates work covered by the following copyright and ****

+    **** permission notice:                                                 ****

+

+    Copyright (c) 2001-2004 Swedish Institute of Computer Science.

+    All rights reserved.

+

+    Redistribution and use in source and binary forms, with or without modification,

+    are permitted provided that the following conditions are met:

+

+    1. Redistributions of source code must retain the above copyright notice,

+       this list of conditions and the following disclaimer.

+    2. Redistributions in binary form must reproduce the above copyright notice,

+       this list of conditions and the following disclaimer in the documentation

+       and/or other materials provided with the distribution.

+    3. The name of the author may not be used to endorse or promote products

+       derived from this software without specific prior written permission.

+

+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED

+    WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

+    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

+    SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

+    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT

+    OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING

+    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY

+    OF SUCH DAMAGE.

+

+    This file is part of the lwIP TCP/IP stack.

+

+    Author: Adam Dunkels <adam@sics.se>

+*/

+

+#include <ch.h>

+

+#ifndef __SYS_ARCH_H__

+#define __SYS_ARCH_H__

+

+typedef Semaphore *     sys_sem_t;

+typedef void *          sys_mbox_t;

+typedef Thread *        sys_thread_t;

+typedef int             sys_prot_t;

+

+#define SYS_MBOX_NULL   (void *)0

+#define SYS_THREAD_NULL (Thread *)0

+#define SYS_SEM_NULL    (Semaphore *)0

+

+void sys_init(void);

+sys_sem_t sys_sem_new(u8_t count);

+void sys_sem_free(sys_sem_t sem);

+void sys_sem_signal(sys_sem_t sem);

+u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout);

+

+sys_mbox_t sys_mbox_new(int size);

+void sys_mbox_free(sys_mbox_t mbox);

+void sys_mbox_post(sys_mbox_t mbox, void *msg);

+err_t sys_mbox_trypost(sys_mbox_t mbox, void *msg);

+u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout);

+u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void **msg);

+

+struct sys_timeouts *sys_arch_timeouts(void);

+

+sys_thread_t sys_thread_new(char *name,

+                            void (* thread)(void *arg),

+                            void *arg,

+                            int stacksize,

+                            int prio);

+

+sys_prot_t sys_arch_protect(void);

+void sys_arch_unprotect(sys_prot_t pval);

+

+#endif /* __SYS_ARCH_H__ */

diff --git a/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/lwip.mk b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/lwip.mk
new file mode 100644
index 000000000..99a046b9d
--- /dev/null
+++ b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/lwip.mk
@@ -0,0 +1,44 @@
+# List of the required lwIP files.

+LWNETIFSRC = \

+        ${CHIBIOS}/ext/lwip/src/netif/etharp.c \

+        ${CHIBIOS}/ext/lwip/src/netif/loopif.c

+

+LWCORESRC = \

+        ${CHIBIOS}/ext/lwip/src/core/dhcp.c \

+        ${CHIBIOS}/ext/lwip/src/core/dns.c \

+        ${CHIBIOS}/ext/lwip/src/core/init.c \

+        ${CHIBIOS}/ext/lwip/src/core/mem.c \

+        ${CHIBIOS}/ext/lwip/src/core/memp.c \

+        ${CHIBIOS}/ext/lwip/src/core/netif.c \

+        ${CHIBIOS}/ext/lwip/src/core/pbuf.c \

+        ${CHIBIOS}/ext/lwip/src/core/raw.c \

+        ${CHIBIOS}/ext/lwip/src/core/stats.c \

+        ${CHIBIOS}/ext/lwip/src/core/sys.c \

+        ${CHIBIOS}/ext/lwip/src/core/tcp.c \

+        ${CHIBIOS}/ext/lwip/src/core/tcp_in.c \

+        ${CHIBIOS}/ext/lwip/src/core/tcp_out.c \

+        ${CHIBIOS}/ext/lwip/src/core/udp.c

+

+LWIPV4SRC = \

+        ${CHIBIOS}/ext/lwip/src/core/ipv4/autoip.c \

+        ${CHIBIOS}/ext/lwip/src/core/ipv4/icmp.c \

+        ${CHIBIOS}/ext/lwip/src/core/ipv4/igmp.c \

+        ${CHIBIOS}/ext/lwip/src/core/ipv4/inet.c \

+        ${CHIBIOS}/ext/lwip/src/core/ipv4/inet_chksum.c \

+        ${CHIBIOS}/ext/lwip/src/core/ipv4/ip.c \

+        ${CHIBIOS}/ext/lwip/src/core/ipv4/ip_addr.c \

+        ${CHIBIOS}/ext/lwip/src/core/ipv4/ip_frag.c

+

+LWAPISRC = \

+        ${CHIBIOS}/ext/lwip/src/api/api_lib.c \

+        ${CHIBIOS}/ext/lwip/src/api/api_msg.c \

+        ${CHIBIOS}/ext/lwip/src/api/err.c \

+        ${CHIBIOS}/ext/lwip/src/api/netbuf.c \

+        ${CHIBIOS}/ext/lwip/src/api/netdb.c \

+        ${CHIBIOS}/ext/lwip/src/api/netifapi.c \

+        ${CHIBIOS}/ext/lwip/src/api/sockets.c \

+        ${CHIBIOS}/ext/lwip/src/api/tcpip.c

+

+LWINC = \

+        ${CHIBIOS}/ext/lwip/src/include \

+        ${CHIBIOS}/ext/lwip/src/include/ipv4

diff --git a/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/netif/ethernetif.c b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/netif/ethernetif.c
new file mode 100644
index 000000000..5716f6e58
--- /dev/null
+++ b/demos/ARM7-AT91SAM7X-LWIP-GCC/lwip/netif/ethernetif.c
@@ -0,0 +1,333 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*
+    **** This file incorporates work covered by the following copyright and ****
+    **** permission notice:                                                 ****
+
+    Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without modification,
+    are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+    3. The name of the author may not be used to endorse or promote products
+       derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+    WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+    SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+    OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+    OF SUCH DAMAGE.
+
+    This file is part of the lwIP TCP/IP stack.
+
+    Author: Adam Dunkels <adam@sics.se>
+*/
+
+/**
+ * @file
+ * Ethernet Interface Skeleton
+ *
+ */
+
+/*
+ * This file is a skeleton for developing Ethernet network interface
+ * drivers for lwIP. Add code to the low_level functions and do a
+ * search-and-replace for the word "ethernetif" to replace it with
+ * something that better describes your network interface.
+ */
+
+#include "lwip/opt.h"
+
+#if 1 /* don't build, this is only a skeleton, see previous comment */
+
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/pbuf.h"
+#include "lwip/sys.h"
+#include <lwip/stats.h>
+#include <lwip/snmp.h>
+#include "netif/etharp.h"
+#include "netif/ppp_oe.h"
+
+/* Define those to better describe your network interface. */
+#define IFNAME0 'e'
+#define IFNAME1 'n'
+
+/**
+ * Helper struct to hold private data used to operate your ethernet interface.
+ * Keeping the ethernet address of the MAC in this struct is not necessary
+ * as it is already kept in the struct netif.
+ * But this is only an example, anyway...
+ */
+struct ethernetif {
+  struct eth_addr *ethaddr;
+  /* Add whatever per-interface state that is needed here. */
+};
+
+/* Forward declarations. */
+static void  ethernetif_input(struct netif *netif);
+
+/**
+ * In this function, the hardware should be initialized.
+ * Called from ethernetif_init().
+ *
+ * @param netif the already initialized lwip network interface structure
+ *        for this ethernetif
+ */
+static void
+low_level_init(struct netif *netif)
+{
+  struct ethernetif *ethernetif = netif->state;
+
+  /* set MAC hardware address length */
+  netif->hwaddr_len = ETHARP_HWADDR_LEN;
+
+  /* set MAC hardware address */
+//////////  netif->hwaddr[0] = ;
+//////////  ...
+//////////  netif->hwaddr[5] = ;
+
+  /* maximum transfer unit */
+  netif->mtu = 1500;
+
+  /* device capabilities */
+  /* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
+  netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;
+
+  /* Do whatever else is needed to initialize interface. */
+}
+
+/**
+ * This function should do the actual transmission of the packet. The packet is
+ * contained in the pbuf that is passed to the function. This pbuf
+ * might be chained.
+ *
+ * @param netif the lwip network interface structure for this ethernetif
+ * @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
+ * @return ERR_OK if the packet could be sent
+ *         an err_t value if the packet couldn't be sent
+ *
+ * @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
+ *       strange results. You might consider waiting for space in the DMA queue
+ *       to become availale since the stack doesn't retry to send a packet
+ *       dropped because of memory failure (except for the TCP timers).
+ */
+
+static err_t
+low_level_output(struct netif *netif, struct pbuf *p)
+{
+  struct ethernetif *ethernetif = netif->state;
+  struct pbuf *q;
+
+//////////  initiate transfer();
+
+#if ETH_PAD_SIZE
+  pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
+#endif
+
+  for(q = p; q != NULL; q = q->next) {
+    /* Send the data from the pbuf to the interface, one pbuf at a
+       time. The size of the data in each pbuf is kept in the ->len
+       variable. */
+//////////    send data from(q->payload, q->len);
+  }
+
+//////////  signal that packet should be sent();
+
+#if ETH_PAD_SIZE
+  pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
+#endif
+
+  LINK_STATS_INC(link.xmit);
+
+  return ERR_OK;
+}
+
+/**
+ * Should allocate a pbuf and transfer the bytes of the incoming
+ * packet from the interface into the pbuf.
+ *
+ * @param netif the lwip network interface structure for this ethernetif
+ * @return a pbuf filled with the received packet (including MAC header)
+ *         NULL on memory error
+ */
+static struct pbuf *
+low_level_input(struct netif *netif)
+{
+  struct ethernetif *ethernetif = netif->state;
+  struct pbuf *p, *q;
+  u16_t len;
+
+  /* Obtain the size of the packet and put it into the "len"
+     variable. */
+//////////  len = ;
+
+#if ETH_PAD_SIZE
+  len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
+#endif
+
+  /* We allocate a pbuf chain of pbufs from the pool. */
+  p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
+
+  if (p != NULL) {
+
+#if ETH_PAD_SIZE
+    pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
+#endif
+
+    /* We iterate over the pbuf chain until we have read the entire
+     * packet into the pbuf. */
+    for(q = p; q != NULL; q = q->next) {
+      /* Read enough bytes to fill this pbuf in the chain. The
+       * available data in the pbuf is given by the q->len
+       * variable. */
+//////////      read data into(q->payload, q->len);
+    }
+//////////    acknowledge that packet has been read();
+
+#if ETH_PAD_SIZE
+    pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
+#endif
+
+    LINK_STATS_INC(link.recv);
+  } else {
+//////////    drop packet();
+    LINK_STATS_INC(link.memerr);
+    LINK_STATS_INC(link.drop);
+  }
+
+  return p;
+}
+
+/**
+ * This function should be called when a packet is ready to be read
+ * from the interface. It uses the function low_level_input() that
+ * should handle the actual reception of bytes from the network
+ * interface. Then the type of the received packet is determined and
+ * the appropriate input function is called.
+ *
+ * @param netif the lwip network interface structure for this ethernetif
+ */
+static void
+ethernetif_input(struct netif *netif)
+{
+  struct ethernetif *ethernetif;
+  struct eth_hdr *ethhdr;
+  struct pbuf *p;
+
+  ethernetif = netif->state;
+
+  /* move received packet into a new pbuf */
+  p = low_level_input(netif);
+  /* no packet could be read, silently ignore this */
+  if (p == NULL) return;
+  /* points to packet payload, which starts with an Ethernet header */
+  ethhdr = p->payload;
+
+  switch (htons(ethhdr->type)) {
+  /* IP or ARP packet? */
+  case ETHTYPE_IP:
+  case ETHTYPE_ARP:
+#if PPPOE_SUPPORT
+  /* PPPoE packet? */
+  case ETHTYPE_PPPOEDISC:
+  case ETHTYPE_PPPOE:
+#endif /* PPPOE_SUPPORT */
+    /* full packet send to tcpip_thread to process */
+    if (netif->input(p, netif)!=ERR_OK)
+     { LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
+       pbuf_free(p);
+       p = NULL;
+     }
+    break;
+
+  default:
+    pbuf_free(p);
+    p = NULL;
+    break;
+  }
+}
+
+/**
+ * Should be called at the beginning of the program to set up the
+ * network interface. It calls the function low_level_init() to do the
+ * actual setup of the hardware.
+ *
+ * This function should be passed as a parameter to netif_add().
+ *
+ * @param netif the lwip network interface structure for this ethernetif
+ * @return ERR_OK if the loopif is initialized
+ *         ERR_MEM if private data couldn't be allocated
+ *         any other err_t on error
+ */
+err_t
+ethernetif_init(struct netif *netif)
+{
+  struct ethernetif *ethernetif;
+
+  LWIP_ASSERT("netif != NULL", (netif != NULL));
+
+  ethernetif = mem_malloc(sizeof(struct ethernetif));
+  if (ethernetif == NULL) {
+    LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
+    return ERR_MEM;
+  }
+
+#if LWIP_NETIF_HOSTNAME
+  /* Initialize interface hostname */
+  netif->hostname = "lwip";
+#endif /* LWIP_NETIF_HOSTNAME */
+
+  /*
+   * Initialize the snmp variables and counters inside the struct netif.
+   * The last argument should be replaced with your link speed, in units
+   * of bits per second.
+   */
+  NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, ???);
+
+  netif->state = ethernetif;
+  netif->name[0] = IFNAME0;
+  netif->name[1] = IFNAME1;
+  /* We directly use etharp_output() here to save a function call.
+   * You can instead declare your own function an call etharp_output()
+   * from it if you have to do some checks before sending (e.g. if link
+   * is available...) */
+  netif->output = etharp_output;
+  netif->linkoutput = low_level_output;
+
+  ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
+
+  /* initialize the hardware */
+  low_level_init(netif);
+
+  return ERR_OK;
+}
+
+#endif /* 0 */