Here's for the fun of history, a diff between the 8390.c in 2.2.16 and the
one in rt-net 0.9.0:
0a1,12
> /*
> rtnet/module/driver/8390.c
> driver for 8390-based network interfaces
>
> rtnet - real-time networking subsystem
> Copyright (C) 1999,2000 Zentropic Computing, LLC
>
> This file is a modified version of a source file located in the
> standard Linux source tree. Information about how to find the
> original version of this file is located in rtnet/original_files.
> */
>
49a62,63
> #define EXPORT_SYMTAB
>
71a86,137
> #if defined(CONFIG_RTNET) || defined(CONFIG_RTNET_MODULE)
> #include <rtnet/rtnet.h>
> #define RT_DRIVER
> static int ei_rt_start_xmit(struct sk_buff *skb, struct rt_device *rtdev);
> #define RT_dev_alloc_skb(a) ((!ei_local->rt)?dev_alloc_skb(a):dev_alloc_rtskb(a))
> #define RT_mark_bh(a) do{if(!ei_local->rt)mark_bh(a);}while(0)
> #define RT_dev_kfree_skb(a) do{if(!ei_local->rt){dev_kfree_skb(a);}else{dev_kfree_rtskb(a);}}while(0)
> #define RT_netif_rx(a) ((!ei_local->rt)?netif_rx(a):rtnetif_rx(a))
> #define RT_printk(format,args...) rt_printk(format,##args)
> #define RT_enable_irq(a) do{if(!ei_local->rt)enable_irq(a);else rt_enable_irq(a);}while(0)
> #define RT_disable_irq_nosync(a) do{if(!ei_local->rt)disable_irq_nosync(a);else rt_disable_irq(a);}while(0)
> #define RT_spin_lock(a) \
> do{if(!ei_local->rt){ \
> spin_lock(a); \
> }else{ \
> rt_spin_lock(a); \
> }}while(0)
> #define RT_spin_unlock(a) \
> do{if(!ei_local->rt){ \
> spin_unlock(a); \
> }else{ \
> rt_spin_unlock(a); \
> }}while(0)
> #define RT_spin_lock_irqsave(a,b) \
> do{if(!ei_local->rt){ \
> spin_lock_irqsave(a,b); \
> }else{ \
> (b)=rt_spin_lock_irqsave(a); \
> }}while(0)
> #define RT_spin_unlock_irqrestore(a,b) \
> do{if(!ei_local->rt){ \
> spin_unlock_irqrestore(a,b); \
> }else{ \
> rt_spin_unlock_irqrestore(b,a); \
> }}while(0)
> #define RT_spin_lock_init(a) spin_lock_init(a)
> #else
> #define DIFE(a,b) (a)
> #define RT_dev_alloc_skb dev_alloc_skb
> #define RT_mark_bh(a) mark_bh(a)
> #define RT_dev_kfree_skb(a) dev_kfree_skb(a)
> #define RT_netif_rx(a) netif_rx(a)
> #define RT_printk printk
> #define RT_enable_irq(a) enable_irq(a)
> #define RT_disable_irq_nosync(a) disable_irq_nosync(a)
> #define RT_spin_lock(a) spin_lock(a)
> #define RT_spin_unlock(a) spin_unlock(a)
> #define RT_spin_lock_irqsave(a,b) spin_lock_irqsave(a,b)
> #define RT_spin_unlock_irqrestore(a,b) spin_unlock_irqrestore(a,b)
> #define RT_spin_lock_init(a) spin_lock_init(a)
> #endif
>
157c223
< printk(KERN_EMERG "%s: ei_open passed a non-existent device!\n", dev->name);
---
> RT_printk(KERN_EMERG "%s: ei_open passed a non-existent device!\n", dev->name);
166c232
< spin_lock_irqsave(&ei_local->page_lock, flags);
---
> RT_spin_lock_irqsave(&ei_local->page_lock, flags);
171c237
< spin_unlock_irqrestore(&ei_local->page_lock, flags);
---
> RT_spin_unlock_irqrestore(&ei_local->page_lock, flags);
186c252
< spin_lock_irqsave(&ei_local->page_lock, flags);
---
> RT_spin_lock_irqsave(&ei_local->page_lock, flags);
188c254
< spin_unlock_irqrestore(&ei_local->page_lock, flags);
---
> RT_spin_unlock_irqrestore(&ei_local->page_lock, flags);
192a259,267
> #ifdef RT_DRIVER
> static int ei_start_xmit(struct sk_buff *skb, struct device *dev);
>
> static int ei_rt_start_xmit(struct sk_buff *skb, struct rt_device *rtdev)
> {
> return ei_start_xmit(skb,rtdev->dev);
> }
> #endif
>
218c293
< spin_lock_irqsave(&ei_local->page_lock, flags);
---
> RT_spin_lock_irqsave(&ei_local->page_lock, flags);
222c297
< spin_unlock_irqrestore(&ei_local->page_lock, flags);
---
> RT_spin_unlock_irqrestore(&ei_local->page_lock, flags);
230,231c305,306
< spin_unlock_irqrestore(&ei_local->page_lock, flags);
< printk(KERN_WARNING "%s: xmit on stopped card\n", dev->name);
---
> RT_spin_unlock_irqrestore(&ei_local->page_lock, flags);
> RT_printk(KERN_WARNING "%s: xmit on stopped card\n", dev->name);
241c316
< printk(KERN_DEBUG "%s: Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
---
> RT_printk(KERN_DEBUG "%s: Tx timed out, %s TSR=%#2x, ISR=%#2x, t=%d.\n",
256c331
< spin_unlock_irqrestore(&ei_local->page_lock, flags);
---
> RT_spin_unlock_irqrestore(&ei_local->page_lock, flags);
260,261c335,336
< disable_irq_nosync(dev->irq);
< spin_lock(&ei_local->page_lock);
---
> RT_disable_irq_nosync(dev->irq);
> RT_spin_lock(&ei_local->page_lock);
263a339
> /* XXX not realtime! */
267,268c343,344
< spin_unlock(&ei_local->page_lock);
< enable_irq(dev->irq);
---
> RT_spin_unlock(&ei_local->page_lock);
> RT_enable_irq(dev->irq);
279c355
< spin_lock_irqsave(&ei_local->page_lock, flags);
---
> RT_spin_lock_irqsave(&ei_local->page_lock, flags);
281c357
< spin_unlock_irqrestore(&ei_local->page_lock, flags);
---
> RT_spin_unlock_irqrestore(&ei_local->page_lock, flags);
288c364
< disable_irq_nosync(dev->irq);
---
> RT_disable_irq_nosync(dev->irq);
290c366
< spin_lock(&ei_local->page_lock);
---
> RT_spin_lock(&ei_local->page_lock);
294c370
< printk(KERN_WARNING "%s: Tx request while isr active.\n",dev->name);
---
> RT_printk(KERN_WARNING "%s: Tx request while isr active.\n",dev->name);
296,297c372,373
< spin_unlock(&ei_local->page_lock);
< enable_irq(dev->irq);
---
> RT_spin_unlock(&ei_local->page_lock);
> RT_enable_irq(dev->irq);
299c375
< dev_kfree_skb(skb);
---
> RT_dev_kfree_skb(skb);
321c397
< printk(KERN_DEBUG "%s: idle transmitter tx2=%d, lasttx=%d, txing=%d.\n",
---
> RT_printk(KERN_DEBUG "%s: idle transmitter tx2=%d, lasttx=%d, txing=%d.\n",
329c405
< printk(KERN_DEBUG "%s: idle transmitter, tx1=%d, lasttx=%d, txing=%d.\n",
---
> RT_printk(KERN_DEBUG "%s: idle transmitter, tx1=%d, lasttx=%d, txing=%d.\n",
335c411
< printk(KERN_DEBUG "%s: No Tx buffers free! irq=%ld tx1=%d tx2=%d last=%d\n",
---
> RT_printk(KERN_DEBUG "%s: No Tx buffers free! irq=%ld tx1=%d tx2=%d last=%d\n",
340,341c416,417
< spin_unlock(&ei_local->page_lock);
< enable_irq(dev->irq);
---
> RT_spin_unlock(&ei_local->page_lock);
> RT_enable_irq(dev->irq);
393,394c469,470
< spin_unlock(&ei_local->page_lock);
< enable_irq(dev->irq);
---
> RT_spin_unlock(&ei_local->page_lock);
> RT_enable_irq(dev->irq);
396c472
< dev_kfree_skb (skb);
---
> RT_dev_kfree_skb (skb);
414c490
< printk ("net_interrupt(): irq %d for unknown device.\n", irq);
---
> RT_printk ("net_interrupt(): irq %d for unknown device.\n", irq);
425c501
< spin_lock(&ei_local->page_lock);
---
> RT_spin_lock(&ei_local->page_lock);
431c507
< printk(ei_local->irqlock
---
> RT_printk(ei_local->irqlock
437c513
< spin_unlock(&ei_local->page_lock);
---
> RT_spin_unlock(&ei_local->page_lock);
447c523
< printk(KERN_DEBUG "%s: interrupt(isr=%#2.2x).\n", dev->name,
---
> RT_printk(KERN_DEBUG "%s: interrupt(isr=%#2.2x).\n", dev->name,
456c532
< printk(KERN_WARNING "%s: interrupt from stopped card\n", dev->name);
---
> RT_printk(KERN_WARNING "%s: interrupt from stopped card\n", dev->name);
495c571
< printk(KERN_WARNING "%s: Too much work at interrupt, status %#2.2x\n",
---
> RT_printk(KERN_WARNING "%s: Too much work at interrupt, status %#2.2x\n",
499c575
< printk(KERN_WARNING "%s: unknown interrupt %#2x\n", dev->name, interrupts);
---
> RT_printk(KERN_WARNING "%s: unknown interrupt %#2x\n", dev->name, interrupts);
504c580
< spin_unlock(&ei_local->page_lock);
---
> RT_spin_unlock(&ei_local->page_lock);
527c603
< printk(KERN_DEBUG "%s: transmitter error (%#2x): ", dev->name, txsr);
---
> RT_printk(KERN_DEBUG "%s: transmitter error (%#2x): ", dev->name, txsr);
529c605
< printk("excess-collisions ");
---
> RT_printk("excess-collisions ");
531c607
< printk("non-deferral ");
---
> RT_printk("non-deferral ");
533c609
< printk("lost-carrier ");
---
> RT_printk("lost-carrier ");
535c611
< printk("FIFO-underrun ");
---
> RT_printk("FIFO-underrun ");
537,538c613,614
< printk("lost-heartbeat ");
< printk("\n");
---
> RT_printk("lost-heartbeat ");
> RT_printk("\n");
576c652
< printk(KERN_ERR "%s: bogus last_tx_buffer %d, tx1=%d.\n",
---
> RT_printk(KERN_ERR "%s: bogus last_tx_buffer %d, tx1=%d.\n",
593c669
< printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
---
> RT_printk("%s: bogus last_tx_buffer %d, tx2=%d.\n",
608c684
< else printk(KERN_WARNING "%s: unexpected TX-done interrupt, lasttx=%d.\n",
---
> else RT_printk(KERN_WARNING "%s: unexpected TX-done interrupt, lasttx=%d.\n",
641c717
< mark_bh (NET_BH);
---
> RT_mark_bh (NET_BH);
674c750
< printk(KERN_ERR "%s: mismatched read page pointers %2x vs %2x.\n",
---
> RT_printk(KERN_ERR "%s: mismatched read page pointers %2x vs %2x.\n",
704c780
< printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
---
> RT_printk(KERN_DEBUG "%s: bogus packet size: %d, status=%#2x nxpg=%#2x.\n",
714c790
< skb = dev_alloc_skb(pkt_len+2);
---
> skb = RT_dev_alloc_skb(pkt_len+2);
718c794
< printk(KERN_DEBUG "%s: Couldn't allocate a sk_buff of size %d.\n",
---
> RT_printk(KERN_DEBUG "%s: Couldn't allocate a sk_buff of size %d.\n",
730c806
< netif_rx(skb);
---
> RT_netif_rx(skb);
740c816
< printk(KERN_DEBUG "%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
---
> RT_printk(KERN_DEBUG "%s: bogus packet: status=%#2x nxpg=%#2x size=%d\n",
752c828
< printk("%s: next frame inconsistency, %#2x\n", dev->name,
---
> RT_printk("%s: next frame inconsistency, %#2x\n", dev->name,
790c866
< printk(KERN_DEBUG "%s: Receiver overrun.\n", dev->name);
---
> RT_printk(KERN_DEBUG "%s: Receiver overrun.\n", dev->name);
855c931
< spin_lock_irqsave(&ei_local->page_lock,flags);
---
> RT_spin_lock_irqsave(&ei_local->page_lock,flags);
860c936
< spin_unlock_irqrestore(&ei_local->page_lock, flags);
---
> RT_spin_unlock_irqrestore(&ei_local->page_lock, flags);
901c977
< printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
---
> RT_printk(KERN_INFO "%s: invalid multicast address length given.\n", dev->name);
980c1056
< spin_lock_irqsave(&ei_local->page_lock, flags);
---
> RT_spin_lock_irqsave(&ei_local->page_lock, flags);
982c1058
< spin_unlock_irqrestore(&ei_local->page_lock, flags);
---
> RT_spin_unlock_irqrestore(&ei_local->page_lock, flags);
1004c1080
< spin_lock_init(&ei_local->page_lock);
---
> RT_spin_lock_init(&ei_local->page_lock);
1010a1087,1097
> #ifdef RT_DRIVER
> {
> struct ei_device *ei_priv = (struct ei_device *)dev->priv;
>
> if(ei_priv->rtdev == NULL)
> ei_priv->rtdev = rt_dev_alloc(dev);
>
> ei_priv->rtdev->xmit = ei_rt_start_xmit;
> }
> #endif
>
1061c1148
< printk(KERN_ERR "Hw. address read/write mismap %d\n",i);
---
> RT_printk(KERN_ERR "Hw. address read/write mismap %d\n",i);
1098c1185
< printk(KERN_WARNING "%s: trigger_send() called with the transmitter busy.\n",
---
> RT_printk(KERN_WARNING "%s: trigger_send() called with the transmitter busy.\n",
Of course this is ancient, but I just thought I'd illustrate my point.
Again, I suggest you drop the single vs. double application/driver, you
get the same results and limitations regardless of the RT method you
adopt.
Karim
--
Author, Speaker, Developer, Consultant
Pushing Embedded and Real-Time Linux Systems Beyond the Limits
http://www.opersys.com || [email protected] || 1-866-677-4546
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