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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* isa-skeleton.c: A network driver outline for linux.
2 *
3 * Written 1993-94 by Donald Becker.
4 *
5 * Copyright 1993 United States Government as represented by the
6 * Director, National Security Agency.
7 *
8 * This software may be used and distributed according to the terms
9 * of the GNU General Public License, incorporated herein by reference.
10 *
11 * The author may be reached as becker@scyld.com, or C/O
12 * Scyld Computing Corporation
13 * 410 Severn Ave., Suite 210
14 * Annapolis MD 21403
15 *
16 * This file is an outline for writing a network device driver for the
17 * the Linux operating system.
18 *
19 * To write (or understand) a driver, have a look at the "loopback.c" file to
20 * get a feel of what is going on, and then use the code below as a skeleton
21 * for the new driver.
22 *
23 */
24
25static const char *version =
26 "isa-skeleton.c:v1.51 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
27
28/*
29 * Sources:
30 * List your sources of programming information to document that
31 * the driver is your own creation, and give due credit to others
32 * that contributed to the work. Remember that GNU project code
33 * cannot use proprietary or trade secret information. Interface
34 * definitions are generally considered non-copyrightable to the
35 * extent that the same names and structures must be used to be
36 * compatible.
37 *
38 * Finally, keep in mind that the Linux kernel is has an API, not
39 * ABI. Proprietary object-code-only distributions are not permitted
40 * under the GPL.
41 */
42
43#include <linux/module.h>
44#include <linux/kernel.h>
45#include <linux/types.h>
46#include <linux/fcntl.h>
47#include <linux/interrupt.h>
48#include <linux/ioport.h>
49#include <linux/in.h>
50#include <linux/slab.h>
51#include <linux/string.h>
52#include <linux/spinlock.h>
53#include <linux/errno.h>
54#include <linux/init.h>
55#include <linux/netdevice.h>
56#include <linux/etherdevice.h>
57#include <linux/skbuff.h>
58#include <linux/bitops.h>
59
60#include <asm/system.h>
61#include <asm/io.h>
62#include <asm/dma.h>
63
64/*
65 * The name of the card. Is used for messages and in the requests for
66 * io regions, irqs and dma channels
67 */
68static const char* cardname = "netcard";
69
70/* First, a few definitions that the brave might change. */
71
72/* A zero-terminated list of I/O addresses to be probed. */
73static unsigned int netcard_portlist[] __initdata =
74 { 0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
75
76/* use 0 for production, 1 for verification, >2 for debug */
77#ifndef NET_DEBUG
78#define NET_DEBUG 2
79#endif
80static unsigned int net_debug = NET_DEBUG;
81
82/* The number of low I/O ports used by the ethercard. */
83#define NETCARD_IO_EXTENT 32
84
85#define MY_TX_TIMEOUT ((400*HZ)/1000)
86
87/* Information that need to be kept for each board. */
88struct net_local {
89 struct net_device_stats stats;
90 long open_time; /* Useless example local info. */
91
92 /* Tx control lock. This protects the transmit buffer ring
93 * state along with the "tx full" state of the driver. This
94 * means all netif_queue flow control actions are protected
95 * by this lock as well.
96 */
97 spinlock_t lock;
98};
99
100/* The station (ethernet) address prefix, used for IDing the board. */
101#define SA_ADDR0 0x00
102#define SA_ADDR1 0x42
103#define SA_ADDR2 0x65
104
105/* Index to functions, as function prototypes. */
106
107static int netcard_probe1(struct net_device *dev, int ioaddr);
108static int net_open(struct net_device *dev);
109static int net_send_packet(struct sk_buff *skb, struct net_device *dev);
David Howells7d12e782006-10-05 14:55:46 +0100110static irqreturn_t net_interrupt(int irq, void *dev_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111static void net_rx(struct net_device *dev);
112static int net_close(struct net_device *dev);
113static struct net_device_stats *net_get_stats(struct net_device *dev);
114static void set_multicast_list(struct net_device *dev);
115static void net_tx_timeout(struct net_device *dev);
116
117
118/* Example routines you must write ;->. */
119#define tx_done(dev) 1
120static void hardware_send_packet(short ioaddr, char *buf, int length);
121static void chipset_init(struct net_device *dev, int startp);
122
123/*
124 * Check for a network adaptor of this type, and return '0' iff one exists.
125 * If dev->base_addr == 0, probe all likely locations.
126 * If dev->base_addr == 1, always return failure.
127 * If dev->base_addr == 2, allocate space for the device and return success
128 * (detachable devices only).
129 */
130static int __init do_netcard_probe(struct net_device *dev)
131{
132 int i;
133 int base_addr = dev->base_addr;
134 int irq = dev->irq;
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 if (base_addr > 0x1ff) /* Check a single specified location. */
137 return netcard_probe1(dev, base_addr);
138 else if (base_addr != 0) /* Don't probe at all. */
139 return -ENXIO;
140
141 for (i = 0; netcard_portlist[i]; i++) {
142 int ioaddr = netcard_portlist[i];
143 if (netcard_probe1(dev, ioaddr) == 0)
144 return 0;
145 dev->irq = irq;
146 }
147
148 return -ENODEV;
149}
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151static void cleanup_card(struct net_device *dev)
152{
153#ifdef jumpered_dma
154 free_dma(dev->dma);
155#endif
156#ifdef jumpered_interrupts
157 free_irq(dev->irq, dev);
158#endif
159 release_region(dev->base_addr, NETCARD_IO_EXTENT);
160}
161
162#ifndef MODULE
163struct net_device * __init netcard_probe(int unit)
164{
165 struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
166 int err;
167
168 if (!dev)
169 return ERR_PTR(-ENOMEM);
170
171 sprintf(dev->name, "eth%d", unit);
172 netdev_boot_setup_check(dev);
173
174 err = do_netcard_probe(dev);
175 if (err)
176 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 return dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178out:
179 free_netdev(dev);
180 return ERR_PTR(err);
181}
182#endif
183
184/*
185 * This is the real probe routine. Linux has a history of friendly device
186 * probes on the ISA bus. A good device probes avoids doing writes, and
187 * verifies that the correct device exists and functions.
188 */
189static int __init netcard_probe1(struct net_device *dev, int ioaddr)
190{
191 struct net_local *np;
192 static unsigned version_printed;
193 int i;
194 int err = -ENODEV;
Joe Perches0795af52007-10-03 17:59:30 -0700195 DECLARE_MAC_BUF(mac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197 /* Grab the region so that no one else tries to probe our ioports. */
198 if (!request_region(ioaddr, NETCARD_IO_EXTENT, cardname))
199 return -EBUSY;
200
201 /*
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400202 * For ethernet adaptors the first three octets of the station address
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 * contains the manufacturer's unique code. That might be a good probe
204 * method. Ideally you would add additional checks.
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400205 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (inb(ioaddr + 0) != SA_ADDR0
207 || inb(ioaddr + 1) != SA_ADDR1
208 || inb(ioaddr + 2) != SA_ADDR2)
209 goto out;
210
211 if (net_debug && version_printed++ == 0)
212 printk(KERN_DEBUG "%s", version);
213
214 printk(KERN_INFO "%s: %s found at %#3x, ", dev->name, cardname, ioaddr);
215
216 /* Fill in the 'dev' fields. */
217 dev->base_addr = ioaddr;
218
219 /* Retrieve and print the ethernet address. */
220 for (i = 0; i < 6; i++)
Joe Perches0795af52007-10-03 17:59:30 -0700221 dev->dev_addr[i] = inb(ioaddr + i);
222
223 printk("%s", print_mac(mac, dev->dev_addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 err = -EAGAIN;
226#ifdef jumpered_interrupts
227 /*
228 * If this board has jumpered interrupts, allocate the interrupt
229 * vector now. There is no point in waiting since no other device
230 * can use the interrupt, and this marks the irq as busy. Jumpered
231 * interrupts are typically not reported by the boards, and we must
232 * used autoIRQ to find them.
233 */
234
235 if (dev->irq == -1)
236 ; /* Do nothing: a user-level program will set it. */
237 else if (dev->irq < 2) { /* "Auto-IRQ" */
238 unsigned long irq_mask = probe_irq_on();
239 /* Trigger an interrupt here. */
240
241 dev->irq = probe_irq_off(irq_mask);
242 if (net_debug >= 2)
243 printk(" autoirq is %d", dev->irq);
244 } else if (dev->irq == 2)
245 /*
246 * Fixup for users that don't know that IRQ 2 is really
247 * IRQ9, or don't know which one to set.
248 */
249 dev->irq = 9;
250
251 {
252 int irqval = request_irq(dev->irq, &net_interrupt, 0, cardname, dev);
253 if (irqval) {
254 printk("%s: unable to get IRQ %d (irqval=%d).\n",
255 dev->name, dev->irq, irqval);
256 goto out;
257 }
258 }
259#endif /* jumpered interrupt */
260#ifdef jumpered_dma
261 /*
262 * If we use a jumpered DMA channel, that should be probed for and
263 * allocated here as well. See lance.c for an example.
264 */
265 if (dev->dma == 0) {
266 if (request_dma(dev->dma, cardname)) {
267 printk("DMA %d allocation failed.\n", dev->dma);
268 goto out1;
269 } else
270 printk(", assigned DMA %d.\n", dev->dma);
271 } else {
272 short dma_status, new_dma_status;
273
274 /* Read the DMA channel status registers. */
275 dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
276 (inb(DMA2_STAT_REG) & 0xf0);
277 /* Trigger a DMA request, perhaps pause a bit. */
278 outw(0x1234, ioaddr + 8);
279 /* Re-read the DMA status registers. */
280 new_dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
281 (inb(DMA2_STAT_REG) & 0xf0);
282 /*
283 * Eliminate the old and floating requests,
284 * and DMA4 the cascade.
285 */
286 new_dma_status ^= dma_status;
287 new_dma_status &= ~0x10;
288 for (i = 7; i > 0; i--)
289 if (test_bit(i, &new_dma_status)) {
290 dev->dma = i;
291 break;
292 }
293 if (i <= 0) {
294 printk("DMA probe failed.\n");
295 goto out1;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400296 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 if (request_dma(dev->dma, cardname)) {
298 printk("probed DMA %d allocation failed.\n", dev->dma);
299 goto out1;
300 }
301 }
302#endif /* jumpered DMA */
303
304 np = netdev_priv(dev);
305 spin_lock_init(&np->lock);
306
307 dev->open = net_open;
308 dev->stop = net_close;
309 dev->hard_start_xmit = net_send_packet;
310 dev->get_stats = net_get_stats;
311 dev->set_multicast_list = &set_multicast_list;
312
313 dev->tx_timeout = &net_tx_timeout;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400314 dev->watchdog_timeo = MY_TX_TIMEOUT;
b1fc5502005-05-12 20:11:55 -0400315
316 err = register_netdev(dev);
317 if (err)
318 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 return 0;
b1fc5502005-05-12 20:11:55 -0400320out2:
321#ifdef jumpered_dma
322 free_dma(dev->dma);
323#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324out1:
325#ifdef jumpered_interrupts
326 free_irq(dev->irq, dev);
327#endif
328out:
329 release_region(base_addr, NETCARD_IO_EXTENT);
330 return err;
331}
332
333static void net_tx_timeout(struct net_device *dev)
334{
335 struct net_local *np = netdev_priv(dev);
336
337 printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
338 tx_done(dev) ? "IRQ conflict" : "network cable problem");
339
340 /* Try to restart the adaptor. */
341 chipset_init(dev, 1);
342
343 np->stats.tx_errors++;
344
345 /* If we have space available to accept new transmit
346 * requests, wake up the queueing layer. This would
347 * be the case if the chipset_init() call above just
348 * flushes out the tx queue and empties it.
349 *
350 * If instead, the tx queue is retained then the
351 * netif_wake_queue() call should be placed in the
352 * TX completion interrupt handler of the driver instead
353 * of here.
354 */
355 if (!tx_full(dev))
356 netif_wake_queue(dev);
357}
358
359/*
360 * Open/initialize the board. This is called (in the current kernel)
361 * sometime after booting when the 'ifconfig' program is run.
362 *
363 * This routine should set everything up anew at each open, even
364 * registers that "should" only need to be set once at boot, so that
365 * there is non-reboot way to recover if something goes wrong.
366 */
367static int
368net_open(struct net_device *dev)
369{
370 struct net_local *np = netdev_priv(dev);
371 int ioaddr = dev->base_addr;
372 /*
373 * This is used if the interrupt line can turned off (shared).
374 * See 3c503.c for an example of selecting the IRQ at config-time.
375 */
376 if (request_irq(dev->irq, &net_interrupt, 0, cardname, dev)) {
377 return -EAGAIN;
378 }
379 /*
380 * Always allocate the DMA channel after the IRQ,
381 * and clean up on failure.
382 */
383 if (request_dma(dev->dma, cardname)) {
384 free_irq(dev->irq, dev);
385 return -EAGAIN;
386 }
387
388 /* Reset the hardware here. Don't forget to set the station address. */
389 chipset_init(dev, 1);
390 outb(0x00, ioaddr);
391 np->open_time = jiffies;
392
393 /* We are now ready to accept transmit requeusts from
394 * the queueing layer of the networking.
395 */
396 netif_start_queue(dev);
397
398 return 0;
399}
400
401/* This will only be invoked if your driver is _not_ in XOFF state.
402 * What this means is that you need not check it, and that this
403 * invariant will hold if you make sure that the netif_*_queue()
404 * calls are done at the proper times.
405 */
406static int net_send_packet(struct sk_buff *skb, struct net_device *dev)
407{
408 struct net_local *np = netdev_priv(dev);
409 int ioaddr = dev->base_addr;
410 short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
411 unsigned char *buf = skb->data;
412
413 /* If some error occurs while trying to transmit this
414 * packet, you should return '1' from this function.
415 * In such a case you _may not_ do anything to the
416 * SKB, it is still owned by the network queueing
417 * layer when an error is returned. This means you
418 * may not modify any SKB fields, you may not free
419 * the SKB, etc.
420 */
421
422#if TX_RING
423 /* This is the most common case for modern hardware.
424 * The spinlock protects this code from the TX complete
425 * hardware interrupt handler. Queue flow control is
426 * thus managed under this lock as well.
427 */
428 spin_lock_irq(&np->lock);
429
430 add_to_tx_ring(np, skb, length);
431 dev->trans_start = jiffies;
432
433 /* If we just used up the very last entry in the
434 * TX ring on this device, tell the queueing
435 * layer to send no more.
436 */
437 if (tx_full(dev))
438 netif_stop_queue(dev);
439
440 /* When the TX completion hw interrupt arrives, this
441 * is when the transmit statistics are updated.
442 */
443
444 spin_unlock_irq(&np->lock);
445#else
446 /* This is the case for older hardware which takes
447 * a single transmit buffer at a time, and it is
448 * just written to the device via PIO.
449 *
450 * No spin locking is needed since there is no TX complete
451 * event. If by chance your card does have a TX complete
452 * hardware IRQ then you may need to utilize np->lock here.
453 */
454 hardware_send_packet(ioaddr, buf, length);
455 np->stats.tx_bytes += skb->len;
456
457 dev->trans_start = jiffies;
458
459 /* You might need to clean up and record Tx statistics here. */
460 if (inw(ioaddr) == /*RU*/81)
461 np->stats.tx_aborted_errors++;
462 dev_kfree_skb (skb);
463#endif
464
465 return 0;
466}
467
468#if TX_RING
469/* This handles TX complete events posted by the device
470 * via interrupts.
471 */
472void net_tx(struct net_device *dev)
473{
474 struct net_local *np = netdev_priv(dev);
475 int entry;
476
477 /* This protects us from concurrent execution of
478 * our dev->hard_start_xmit function above.
479 */
480 spin_lock(&np->lock);
481
482 entry = np->tx_old;
483 while (tx_entry_is_sent(np, entry)) {
484 struct sk_buff *skb = np->skbs[entry];
485
486 np->stats.tx_bytes += skb->len;
487 dev_kfree_skb_irq (skb);
488
489 entry = next_tx_entry(np, entry);
490 }
491 np->tx_old = entry;
492
493 /* If we had stopped the queue due to a "tx full"
494 * condition, and space has now been made available,
495 * wake up the queue.
496 */
497 if (netif_queue_stopped(dev) && ! tx_full(dev))
498 netif_wake_queue(dev);
499
500 spin_unlock(&np->lock);
501}
502#endif
503
504/*
505 * The typical workload of the driver:
506 * Handle the network interface interrupts.
507 */
David Howells7d12e782006-10-05 14:55:46 +0100508static irqreturn_t net_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509{
510 struct net_device *dev = dev_id;
511 struct net_local *np;
512 int ioaddr, status;
513 int handled = 0;
514
515 ioaddr = dev->base_addr;
516
517 np = netdev_priv(dev);
518 status = inw(ioaddr + 0);
519
520 if (status == 0)
521 goto out;
522 handled = 1;
523
524 if (status & RX_INTR) {
525 /* Got a packet(s). */
526 net_rx(dev);
527 }
528#if TX_RING
529 if (status & TX_INTR) {
530 /* Transmit complete. */
531 net_tx(dev);
532 np->stats.tx_packets++;
533 netif_wake_queue(dev);
534 }
535#endif
536 if (status & COUNTERS_INTR) {
537 /* Increment the appropriate 'localstats' field. */
538 np->stats.tx_window_errors++;
539 }
540out:
541 return IRQ_RETVAL(handled);
542}
543
544/* We have a good packet(s), get it/them out of the buffers. */
545static void
546net_rx(struct net_device *dev)
547{
548 struct net_local *lp = netdev_priv(dev);
549 int ioaddr = dev->base_addr;
550 int boguscount = 10;
551
552 do {
553 int status = inw(ioaddr);
554 int pkt_len = inw(ioaddr);
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400555
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 if (pkt_len == 0) /* Read all the frames? */
557 break; /* Done for now */
558
559 if (status & 0x40) { /* There was an error. */
560 lp->stats.rx_errors++;
561 if (status & 0x20) lp->stats.rx_frame_errors++;
562 if (status & 0x10) lp->stats.rx_over_errors++;
563 if (status & 0x08) lp->stats.rx_crc_errors++;
564 if (status & 0x04) lp->stats.rx_fifo_errors++;
565 } else {
566 /* Malloc up new buffer. */
567 struct sk_buff *skb;
568
569 lp->stats.rx_bytes+=pkt_len;
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 skb = dev_alloc_skb(pkt_len);
572 if (skb == NULL) {
573 printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
574 dev->name);
575 lp->stats.rx_dropped++;
576 break;
577 }
578 skb->dev = dev;
579
580 /* 'skb->data' points to the start of sk_buff data area. */
581 memcpy(skb_put(skb,pkt_len), (void*)dev->rmem_start,
582 pkt_len);
583 /* or */
584 insw(ioaddr, skb->data, (pkt_len + 1) >> 1);
585
586 netif_rx(skb);
587 dev->last_rx = jiffies;
588 lp->stats.rx_packets++;
589 lp->stats.rx_bytes += pkt_len;
590 }
591 } while (--boguscount);
592
593 return;
594}
595
596/* The inverse routine to net_open(). */
597static int
598net_close(struct net_device *dev)
599{
600 struct net_local *lp = netdev_priv(dev);
601 int ioaddr = dev->base_addr;
602
603 lp->open_time = 0;
604
605 netif_stop_queue(dev);
606
607 /* Flush the Tx and disable Rx here. */
608
609 disable_dma(dev->dma);
610
611 /* If not IRQ or DMA jumpered, free up the line. */
612 outw(0x00, ioaddr+0); /* Release the physical interrupt line. */
613
614 free_irq(dev->irq, dev);
615 free_dma(dev->dma);
616
617 /* Update the statistics here. */
618
619 return 0;
620
621}
622
623/*
624 * Get the current statistics.
625 * This may be called with the card open or closed.
626 */
627static struct net_device_stats *net_get_stats(struct net_device *dev)
628{
629 struct net_local *lp = netdev_priv(dev);
630 short ioaddr = dev->base_addr;
631
632 /* Update the statistics from the device registers. */
633 lp->stats.rx_missed_errors = inw(ioaddr+1);
634 return &lp->stats;
635}
636
637/*
638 * Set or clear the multicast filter for this adaptor.
639 * num_addrs == -1 Promiscuous mode, receive all packets
640 * num_addrs == 0 Normal mode, clear multicast list
641 * num_addrs > 0 Multicast mode, receive normal and MC packets,
642 * and do best-effort filtering.
643 */
644static void
645set_multicast_list(struct net_device *dev)
646{
647 short ioaddr = dev->base_addr;
648 if (dev->flags&IFF_PROMISC)
649 {
650 /* Enable promiscuous mode */
651 outw(MULTICAST|PROMISC, ioaddr);
652 }
653 else if((dev->flags&IFF_ALLMULTI) || dev->mc_count > HW_MAX_ADDRS)
654 {
655 /* Disable promiscuous mode, use normal mode. */
656 hardware_set_filter(NULL);
657
658 outw(MULTICAST, ioaddr);
659 }
660 else if(dev->mc_count)
661 {
662 /* Walk the address list, and load the filter */
663 hardware_set_filter(dev->mc_list);
664
665 outw(MULTICAST, ioaddr);
666 }
Jeff Garzik6aa20a22006-09-13 13:24:59 -0400667 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 outw(0, ioaddr);
669}
670
671#ifdef MODULE
672
673static struct net_device *this_device;
674static int io = 0x300;
675static int irq;
676static int dma;
677static int mem;
678MODULE_LICENSE("GPL");
679
680int init_module(void)
681{
682 struct net_device *dev;
683 int result;
684
685 if (io == 0)
686 printk(KERN_WARNING "%s: You shouldn't use auto-probing with insmod!\n",
687 cardname);
688 dev = alloc_etherdev(sizeof(struct net_local));
689 if (!dev)
690 return -ENOMEM;
691
692 /* Copy the parameters from insmod into the device structure. */
693 dev->base_addr = io;
694 dev->irq = irq;
695 dev->dma = dma;
696 dev->mem_start = mem;
697 if (do_netcard_probe(dev) == 0) {
b1fc5502005-05-12 20:11:55 -0400698 this_device = dev;
699 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 }
701 free_netdev(dev);
702 return -ENXIO;
703}
704
705void
706cleanup_module(void)
707{
708 unregister_netdev(this_device);
709 cleanup_card(this_device);
710 free_netdev(this_device);
711}
712
713#endif /* MODULE */
714
715/*
716 * Local variables:
717 * compile-command:
718 * gcc -D__KERNEL__ -Wall -Wstrict-prototypes -Wwrite-strings
719 * -Wredundant-decls -O2 -m486 -c skeleton.c
720 * version-control: t
721 * kept-new-versions: 5
722 * tab-width: 4
723 * c-indent-level: 4
724 * End:
725 */