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linux/drivers/net/wan/sbni.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

1734 lines
43 KiB
C
Raw Blame History

/* sbni.c: Granch SBNI12 leased line adapters driver for linux
*
* Written 2001 by Denis I.Timofeev (timofeev@granch.ru)
*
* Previous versions were written by Yaroslav Polyakov,
* Alexey Zverev and Max Khon.
*
* Driver supports SBNI12-02,-04,-05,-10,-11 cards, single and
* double-channel, PCI and ISA modifications.
* More info and useful utilities to work with SBNI12 cards you can find
* at http://www.granch.com (English) or http://www.granch.ru (Russian)
*
* This software may be used and distributed according to the terms
* of the GNU General Public License.
*
*
* 5.0.1 Jun 22 2001
* - Fixed bug in probe
* 5.0.0 Jun 06 2001
* - Driver was completely redesigned by Denis I.Timofeev,
* - now PCI/Dual, ISA/Dual (with single interrupt line) models are
* - supported
* 3.3.0 Thu Feb 24 21:30:28 NOVT 2000
* - PCI cards support
* 3.2.0 Mon Dec 13 22:26:53 NOVT 1999
* - Completely rebuilt all the packet storage system
* - to work in Ethernet-like style.
* 3.1.1 just fixed some bugs (5 aug 1999)
* 3.1.0 added balancing feature (26 apr 1999)
* 3.0.1 just fixed some bugs (14 apr 1999).
* 3.0.0 Initial Revision, Yaroslav Polyakov (24 Feb 1999)
* - added pre-calculation for CRC, fixed bug with "len-2" frames,
* - removed outbound fragmentation (MTU=1000), written CRC-calculation
* - on asm, added work with hard_headers and now we have our own cache
* - for them, optionally supported word-interchange on some chipsets,
*
* Known problem: this driver wasn't tested on multiprocessor machine.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/fcntl.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/pci.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <net/arp.h>
#include <asm/io.h>
#include <asm/types.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include "sbni.h"
/* device private data */
struct net_local {
struct net_device_stats stats;
struct timer_list watchdog;
spinlock_t lock;
struct sk_buff *rx_buf_p; /* receive buffer ptr */
struct sk_buff *tx_buf_p; /* transmit buffer ptr */
unsigned int framelen; /* current frame length */
unsigned int maxframe; /* maximum valid frame length */
unsigned int state;
unsigned int inppos, outpos; /* positions in rx/tx buffers */
/* transmitting frame number - from frames qty to 1 */
unsigned int tx_frameno;
/* expected number of next receiving frame */
unsigned int wait_frameno;
/* count of failed attempts to frame send - 32 attempts do before
error - while receiver tunes on opposite side of wire */
unsigned int trans_errors;
/* idle time; send pong when limit exceeded */
unsigned int timer_ticks;
/* fields used for receive level autoselection */
int delta_rxl;
unsigned int cur_rxl_index, timeout_rxl;
unsigned long cur_rxl_rcvd, prev_rxl_rcvd;
struct sbni_csr1 csr1; /* current value of CSR1 */
struct sbni_in_stats in_stats; /* internal statistics */
struct net_device *second; /* for ISA/dual cards */
#ifdef CONFIG_SBNI_MULTILINE
struct net_device *master;
struct net_device *link;
#endif
};
static int sbni_card_probe( unsigned long );
static int sbni_pci_probe( struct net_device * );
static struct net_device *sbni_probe1(struct net_device *, unsigned long, int);
static int sbni_open( struct net_device * );
static int sbni_close( struct net_device * );
static int sbni_start_xmit( struct sk_buff *, struct net_device * );
static int sbni_ioctl( struct net_device *, struct ifreq *, int );
static struct net_device_stats *sbni_get_stats( struct net_device * );
static void set_multicast_list( struct net_device * );
static irqreturn_t sbni_interrupt( int, void * );
static void handle_channel( struct net_device * );
static int recv_frame( struct net_device * );
static void send_frame( struct net_device * );
static int upload_data( struct net_device *,
unsigned, unsigned, unsigned, u32 );
static void download_data( struct net_device *, u32 * );
static void sbni_watchdog( unsigned long );
static void interpret_ack( struct net_device *, unsigned );
static int append_frame_to_pkt( struct net_device *, unsigned, u32 );
static void indicate_pkt( struct net_device * );
static void card_start( struct net_device * );
static void prepare_to_send( struct sk_buff *, struct net_device * );
static void drop_xmit_queue( struct net_device * );
static void send_frame_header( struct net_device *, u32 * );
static int skip_tail( unsigned int, unsigned int, u32 );
static int check_fhdr( u32, u32 *, u32 *, u32 *, u32 *, u32 * );
static void change_level( struct net_device * );
static void timeout_change_level( struct net_device * );
static u32 calc_crc32( u32, u8 *, u32 );
static struct sk_buff * get_rx_buf( struct net_device * );
static int sbni_init( struct net_device * );
#ifdef CONFIG_SBNI_MULTILINE
static int enslave( struct net_device *, struct net_device * );
static int emancipate( struct net_device * );
#endif
#ifdef __i386__
#define ASM_CRC 1
#endif
static const char version[] =
"Granch SBNI12 driver ver 5.0.1 Jun 22 2001 Denis I.Timofeev.\n";
static int skip_pci_probe __initdata = 0;
static int scandone __initdata = 0;
static int num __initdata = 0;
static unsigned char rxl_tab[];
static u32 crc32tab[];
/* A list of all installed devices, for removing the driver module. */
static struct net_device *sbni_cards[ SBNI_MAX_NUM_CARDS ];
/* Lists of device's parameters */
static u32 io[ SBNI_MAX_NUM_CARDS ] __initdata =
{ [0 ... SBNI_MAX_NUM_CARDS-1] = -1 };
static u32 irq[ SBNI_MAX_NUM_CARDS ] __initdata;
static u32 baud[ SBNI_MAX_NUM_CARDS ] __initdata;
static u32 rxl[ SBNI_MAX_NUM_CARDS ] __initdata =
{ [0 ... SBNI_MAX_NUM_CARDS-1] = -1 };
static u32 mac[ SBNI_MAX_NUM_CARDS ] __initdata;
#ifndef MODULE
typedef u32 iarr[];
static iarr __initdata *dest[5] = { &io, &irq, &baud, &rxl, &mac };
#endif
/* A zero-terminated list of I/O addresses to be probed on ISA bus */
static unsigned int netcard_portlist[ ] __initdata = {
0x210, 0x214, 0x220, 0x224, 0x230, 0x234, 0x240, 0x244, 0x250, 0x254,
0x260, 0x264, 0x270, 0x274, 0x280, 0x284, 0x290, 0x294, 0x2a0, 0x2a4,
0x2b0, 0x2b4, 0x2c0, 0x2c4, 0x2d0, 0x2d4, 0x2e0, 0x2e4, 0x2f0, 0x2f4,
0 };
/*
* Look for SBNI card which addr stored in dev->base_addr, if nonzero.
* Otherwise, look through PCI bus. If none PCI-card was found, scan ISA.
*/
static inline int __init
sbni_isa_probe( struct net_device *dev )
{
if( dev->base_addr > 0x1ff
&& request_region( dev->base_addr, SBNI_IO_EXTENT, dev->name )
&& sbni_probe1( dev, dev->base_addr, dev->irq ) )
return 0;
else {
printk( KERN_ERR "sbni: base address 0x%lx is busy, or adapter "
"is malfunctional!\n", dev->base_addr );
return -ENODEV;
}
}
static void __init sbni_devsetup(struct net_device *dev)
{
ether_setup( dev );
dev->open = &sbni_open;
dev->stop = &sbni_close;
dev->hard_start_xmit = &sbni_start_xmit;
dev->get_stats = &sbni_get_stats;
dev->set_multicast_list = &set_multicast_list;
dev->do_ioctl = &sbni_ioctl;
SET_MODULE_OWNER( dev );
}
int __init sbni_probe(int unit)
{
struct net_device *dev;
static unsigned version_printed __initdata = 0;
int err;
dev = alloc_netdev(sizeof(struct net_local), "sbni", sbni_devsetup);
if (!dev)
return -ENOMEM;
sprintf(dev->name, "sbni%d", unit);
netdev_boot_setup_check(dev);
err = sbni_init(dev);
if (err) {
free_netdev(dev);
return err;
}
err = register_netdev(dev);
if (err) {
release_region( dev->base_addr, SBNI_IO_EXTENT );
free_netdev(dev);
return err;
}
if( version_printed++ == 0 )
printk( KERN_INFO "%s", version );
return 0;
}
static int __init sbni_init(struct net_device *dev)
{
int i;
if( dev->base_addr )
return sbni_isa_probe( dev );
/* otherwise we have to perform search our adapter */
if( io[ num ] != -1 )
dev->base_addr = io[ num ],
dev->irq = irq[ num ];
else if( scandone || io[ 0 ] != -1 )
return -ENODEV;
/* if io[ num ] contains non-zero address, then that is on ISA bus */
if( dev->base_addr )
return sbni_isa_probe( dev );
/* ...otherwise - scan PCI first */
if( !skip_pci_probe && !sbni_pci_probe( dev ) )
return 0;
if( io[ num ] == -1 ) {
/* Auto-scan will be stopped when first ISA card were found */
scandone = 1;
if( num > 0 )
return -ENODEV;
}
for( i = 0; netcard_portlist[ i ]; ++i ) {
int ioaddr = netcard_portlist[ i ];
if( request_region( ioaddr, SBNI_IO_EXTENT, dev->name )
&& sbni_probe1( dev, ioaddr, 0 ))
return 0;
}
return -ENODEV;
}
int __init
sbni_pci_probe( struct net_device *dev )
{
struct pci_dev *pdev = NULL;
while( (pdev = pci_get_class( PCI_CLASS_NETWORK_OTHER << 8, pdev ))
!= NULL ) {
int pci_irq_line;
unsigned long pci_ioaddr;
u16 subsys;
if( pdev->vendor != SBNI_PCI_VENDOR
&& pdev->device != SBNI_PCI_DEVICE )
continue;
pci_ioaddr = pci_resource_start( pdev, 0 );
pci_irq_line = pdev->irq;
/* Avoid already found cards from previous calls */
if( !request_region( pci_ioaddr, SBNI_IO_EXTENT, dev->name ) ) {
pci_read_config_word( pdev, PCI_SUBSYSTEM_ID, &subsys );
if (subsys != 2)
continue;
/* Dual adapter is present */
if (!request_region(pci_ioaddr += 4, SBNI_IO_EXTENT,
dev->name ) )
continue;
}
if( pci_irq_line <= 0 || pci_irq_line >= NR_IRQS )
printk( KERN_WARNING " WARNING: The PCI BIOS assigned "
"this PCI card to IRQ %d, which is unlikely "
"to work!.\n"
KERN_WARNING " You should use the PCI BIOS "
"setup to assign a valid IRQ line.\n",
pci_irq_line );
/* avoiding re-enable dual adapters */
if( (pci_ioaddr & 7) == 0 && pci_enable_device( pdev ) ) {
release_region( pci_ioaddr, SBNI_IO_EXTENT );
pci_dev_put( pdev );
return -EIO;
}
if( sbni_probe1( dev, pci_ioaddr, pci_irq_line ) ) {
SET_NETDEV_DEV(dev, &pdev->dev);
/* not the best thing to do, but this is all messed up
for hotplug systems anyway... */
pci_dev_put( pdev );
return 0;
}
}
return -ENODEV;
}
static struct net_device * __init
sbni_probe1( struct net_device *dev, unsigned long ioaddr, int irq )
{
struct net_local *nl;
if( sbni_card_probe( ioaddr ) ) {
release_region( ioaddr, SBNI_IO_EXTENT );
return NULL;
}
outb( 0, ioaddr + CSR0 );
if( irq < 2 ) {
unsigned long irq_mask;
irq_mask = probe_irq_on();
outb( EN_INT | TR_REQ, ioaddr + CSR0 );
outb( PR_RES, ioaddr + CSR1 );
mdelay(50);
irq = probe_irq_off(irq_mask);
outb( 0, ioaddr + CSR0 );
if( !irq ) {
printk( KERN_ERR "%s: can't detect device irq!\n",
dev->name );
release_region( ioaddr, SBNI_IO_EXTENT );
return NULL;
}
} else if( irq == 2 )
irq = 9;
dev->irq = irq;
dev->base_addr = ioaddr;
/* Allocate dev->priv and fill in sbni-specific dev fields. */
nl = dev->priv;
if( !nl ) {
printk( KERN_ERR "%s: unable to get memory!\n", dev->name );
release_region( ioaddr, SBNI_IO_EXTENT );
return NULL;
}
dev->priv = nl;
memset( nl, 0, sizeof(struct net_local) );
spin_lock_init( &nl->lock );
/* store MAC address (generate if that isn't known) */
*(u16 *)dev->dev_addr = htons( 0x00ff );
*(u32 *)(dev->dev_addr + 2) = htonl( 0x01000000 |
( (mac[num] ? mac[num] : (u32)((long)dev->priv)) & 0x00ffffff) );
/* store link settings (speed, receive level ) */
nl->maxframe = DEFAULT_FRAME_LEN;
nl->csr1.rate = baud[ num ];
if( (nl->cur_rxl_index = rxl[ num ]) == -1 )
/* autotune rxl */
nl->cur_rxl_index = DEF_RXL,
nl->delta_rxl = DEF_RXL_DELTA;
else
nl->delta_rxl = 0;
nl->csr1.rxl = rxl_tab[ nl->cur_rxl_index ];
if( inb( ioaddr + CSR0 ) & 0x01 )
nl->state |= FL_SLOW_MODE;
printk( KERN_NOTICE "%s: ioaddr %#lx, irq %d, "
"MAC: 00:ff:01:%02x:%02x:%02x\n",
dev->name, dev->base_addr, dev->irq,
((u8 *) dev->dev_addr) [3],
((u8 *) dev->dev_addr) [4],
((u8 *) dev->dev_addr) [5] );
printk( KERN_NOTICE "%s: speed %d, receive level ", dev->name,
( (nl->state & FL_SLOW_MODE) ? 500000 : 2000000)
/ (1 << nl->csr1.rate) );
if( nl->delta_rxl == 0 )
printk( "0x%x (fixed)\n", nl->cur_rxl_index );
else
printk( "(auto)\n");
#ifdef CONFIG_SBNI_MULTILINE
nl->master = dev;
nl->link = NULL;
#endif
sbni_cards[ num++ ] = dev;
return dev;
}
/* -------------------------------------------------------------------------- */
#ifdef CONFIG_SBNI_MULTILINE
static int
sbni_start_xmit( struct sk_buff *skb, struct net_device *dev )
{
struct net_device *p;
netif_stop_queue( dev );
/* Looking for idle device in the list */
for( p = dev; p; ) {
struct net_local *nl = (struct net_local *) p->priv;
spin_lock( &nl->lock );
if( nl->tx_buf_p || (nl->state & FL_LINE_DOWN) ) {
p = nl->link;
spin_unlock( &nl->lock );
} else {
/* Idle dev is found */
prepare_to_send( skb, p );
spin_unlock( &nl->lock );
netif_start_queue( dev );
return 0;
}
}
return 1;
}
#else /* CONFIG_SBNI_MULTILINE */
static int
sbni_start_xmit( struct sk_buff *skb, struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
netif_stop_queue( dev );
spin_lock( &nl->lock );
prepare_to_send( skb, dev );
spin_unlock( &nl->lock );
return 0;
}
#endif /* CONFIG_SBNI_MULTILINE */
/* -------------------------------------------------------------------------- */
/* interrupt handler */
/*
* SBNI12D-10, -11/ISA boards within "common interrupt" mode could not
* be looked as two independent single-channel devices. Every channel seems
* as Ethernet interface but interrupt handler must be common. Really, first
* channel ("master") driver only registers the handler. In its struct net_local
* it has got pointer to "slave" channel's struct net_local and handles that's
* interrupts too.
* dev of successfully attached ISA SBNI boards is linked to list.
* While next board driver is initialized, it scans this list. If one
* has found dev with same irq and ioaddr different by 4 then it assumes
* this board to be "master".
*/
static irqreturn_t
sbni_interrupt( int irq, void *dev_id )
{
struct net_device *dev = (struct net_device *) dev_id;
struct net_local *nl = (struct net_local *) dev->priv;
int repeat;
spin_lock( &nl->lock );
if( nl->second )
spin_lock( &((struct net_local *) nl->second->priv)->lock );
do {
repeat = 0;
if( inb( dev->base_addr + CSR0 ) & (RC_RDY | TR_RDY) )
handle_channel( dev ),
repeat = 1;
if( nl->second && /* second channel present */
(inb( nl->second->base_addr+CSR0 ) & (RC_RDY | TR_RDY)) )
handle_channel( nl->second ),
repeat = 1;
} while( repeat );
if( nl->second )
spin_unlock( &((struct net_local *)nl->second->priv)->lock );
spin_unlock( &nl->lock );
return IRQ_HANDLED;
}
static void
handle_channel( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
unsigned long ioaddr = dev->base_addr;
int req_ans;
unsigned char csr0;
#ifdef CONFIG_SBNI_MULTILINE
/* Lock the master device because we going to change its local data */
if( nl->state & FL_SLAVE )
spin_lock( &((struct net_local *) nl->master->priv)->lock );
#endif
outb( (inb( ioaddr + CSR0 ) & ~EN_INT) | TR_REQ, ioaddr + CSR0 );
nl->timer_ticks = CHANGE_LEVEL_START_TICKS;
for(;;) {
csr0 = inb( ioaddr + CSR0 );
if( ( csr0 & (RC_RDY | TR_RDY) ) == 0 )
break;
req_ans = !(nl->state & FL_PREV_OK);
if( csr0 & RC_RDY )
req_ans = recv_frame( dev );
/*
* TR_RDY always equals 1 here because we have owned the marker,
* and we set TR_REQ when disabled interrupts
*/
csr0 = inb( ioaddr + CSR0 );
if( !(csr0 & TR_RDY) || (csr0 & RC_RDY) )
printk( KERN_ERR "%s: internal error!\n", dev->name );
/* if state & FL_NEED_RESEND != 0 then tx_frameno != 0 */
if( req_ans || nl->tx_frameno != 0 )
send_frame( dev );
else
/* send marker without any data */
outb( inb( ioaddr + CSR0 ) & ~TR_REQ, ioaddr + CSR0 );
}
outb( inb( ioaddr + CSR0 ) | EN_INT, ioaddr + CSR0 );
#ifdef CONFIG_SBNI_MULTILINE
if( nl->state & FL_SLAVE )
spin_unlock( &((struct net_local *) nl->master->priv)->lock );
#endif
}
/*
* Routine returns 1 if it need to acknoweledge received frame.
* Empty frame received without errors won't be acknoweledged.
*/
static int
recv_frame( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
unsigned long ioaddr = dev->base_addr;
u32 crc = CRC32_INITIAL;
unsigned framelen, frameno, ack;
unsigned is_first, frame_ok;
if( check_fhdr( ioaddr, &framelen, &frameno, &ack, &is_first, &crc ) ) {
frame_ok = framelen > 4
? upload_data( dev, framelen, frameno, is_first, crc )
: skip_tail( ioaddr, framelen, crc );
if( frame_ok )
interpret_ack( dev, ack );
} else
frame_ok = 0;
outb( inb( ioaddr + CSR0 ) ^ CT_ZER, ioaddr + CSR0 );
if( frame_ok ) {
nl->state |= FL_PREV_OK;
if( framelen > 4 )
nl->in_stats.all_rx_number++;
} else
nl->state &= ~FL_PREV_OK,
change_level( dev ),
nl->in_stats.all_rx_number++,
nl->in_stats.bad_rx_number++;
return !frame_ok || framelen > 4;
}
static void
send_frame( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
u32 crc = CRC32_INITIAL;
if( nl->state & FL_NEED_RESEND ) {
/* if frame was sended but not ACK'ed - resend it */
if( nl->trans_errors ) {
--nl->trans_errors;
if( nl->framelen != 0 )
nl->in_stats.resend_tx_number++;
} else {
/* cannot xmit with many attempts */
#ifdef CONFIG_SBNI_MULTILINE
if( (nl->state & FL_SLAVE) || nl->link )
#endif
nl->state |= FL_LINE_DOWN;
drop_xmit_queue( dev );
goto do_send;
}
} else
nl->trans_errors = TR_ERROR_COUNT;
send_frame_header( dev, &crc );
nl->state |= FL_NEED_RESEND;
/*
* FL_NEED_RESEND will be cleared after ACK, but if empty
* frame sended then in prepare_to_send next frame
*/
if( nl->framelen ) {
download_data( dev, &crc );
nl->in_stats.all_tx_number++;
nl->state |= FL_WAIT_ACK;
}
outsb( dev->base_addr + DAT, (u8 *)&crc, sizeof crc );
do_send:
outb( inb( dev->base_addr + CSR0 ) & ~TR_REQ, dev->base_addr + CSR0 );
if( nl->tx_frameno )
/* next frame exists - we request card to send it */
outb( inb( dev->base_addr + CSR0 ) | TR_REQ,
dev->base_addr + CSR0 );
}
/*
* Write the frame data into adapter's buffer memory, and calculate CRC.
* Do padding if necessary.
*/
static void
download_data( struct net_device *dev, u32 *crc_p )
{
struct net_local *nl = (struct net_local *) dev->priv;
struct sk_buff *skb = nl->tx_buf_p;
unsigned len = min_t(unsigned int, skb->len - nl->outpos, nl->framelen);
outsb( dev->base_addr + DAT, skb->data + nl->outpos, len );
*crc_p = calc_crc32( *crc_p, skb->data + nl->outpos, len );
/* if packet too short we should write some more bytes to pad */
for( len = nl->framelen - len; len--; )
outb( 0, dev->base_addr + DAT ),
*crc_p = CRC32( 0, *crc_p );
}
static int
upload_data( struct net_device *dev, unsigned framelen, unsigned frameno,
unsigned is_first, u32 crc )
{
struct net_local *nl = (struct net_local *) dev->priv;
int frame_ok;
if( is_first )
nl->wait_frameno = frameno,
nl->inppos = 0;
if( nl->wait_frameno == frameno ) {
if( nl->inppos + framelen <= ETHER_MAX_LEN )
frame_ok = append_frame_to_pkt( dev, framelen, crc );
/*
* if CRC is right but framelen incorrect then transmitter
* error was occurred... drop entire packet
*/
else if( (frame_ok = skip_tail( dev->base_addr, framelen, crc ))
!= 0 )
nl->wait_frameno = 0,
nl->inppos = 0,
#ifdef CONFIG_SBNI_MULTILINE
((struct net_local *) nl->master->priv)
->stats.rx_errors++,
((struct net_local *) nl->master->priv)
->stats.rx_missed_errors++;
#else
nl->stats.rx_errors++,
nl->stats.rx_missed_errors++;
#endif
/* now skip all frames until is_first != 0 */
} else
frame_ok = skip_tail( dev->base_addr, framelen, crc );
if( is_first && !frame_ok )
/*
* Frame has been broken, but we had already stored
* is_first... Drop entire packet.
*/
nl->wait_frameno = 0,
#ifdef CONFIG_SBNI_MULTILINE
((struct net_local *) nl->master->priv)->stats.rx_errors++,
((struct net_local *) nl->master->priv)->stats.rx_crc_errors++;
#else
nl->stats.rx_errors++,
nl->stats.rx_crc_errors++;
#endif
return frame_ok;
}
static __inline void
send_complete( struct net_local *nl )
{
#ifdef CONFIG_SBNI_MULTILINE
((struct net_local *) nl->master->priv)->stats.tx_packets++;
((struct net_local *) nl->master->priv)->stats.tx_bytes
+= nl->tx_buf_p->len;
#else
nl->stats.tx_packets++;
nl->stats.tx_bytes += nl->tx_buf_p->len;
#endif
dev_kfree_skb_irq( nl->tx_buf_p );
nl->tx_buf_p = NULL;
nl->outpos = 0;
nl->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
nl->framelen = 0;
}
static void
interpret_ack( struct net_device *dev, unsigned ack )
{
struct net_local *nl = (struct net_local *) dev->priv;
if( ack == FRAME_SENT_OK ) {
nl->state &= ~FL_NEED_RESEND;
if( nl->state & FL_WAIT_ACK ) {
nl->outpos += nl->framelen;
if( --nl->tx_frameno )
nl->framelen = min_t(unsigned int,
nl->maxframe,
nl->tx_buf_p->len - nl->outpos);
else
send_complete( nl ),
#ifdef CONFIG_SBNI_MULTILINE
netif_wake_queue( nl->master );
#else
netif_wake_queue( dev );
#endif
}
}
nl->state &= ~FL_WAIT_ACK;
}
/*
* Glue received frame with previous fragments of packet.
* Indicate packet when last frame would be accepted.
*/
static int
append_frame_to_pkt( struct net_device *dev, unsigned framelen, u32 crc )
{
struct net_local *nl = (struct net_local *) dev->priv;
u8 *p;
if( nl->inppos + framelen > ETHER_MAX_LEN )
return 0;
if( !nl->rx_buf_p && !(nl->rx_buf_p = get_rx_buf( dev )) )
return 0;
p = nl->rx_buf_p->data + nl->inppos;
insb( dev->base_addr + DAT, p, framelen );
if( calc_crc32( crc, p, framelen ) != CRC32_REMAINDER )
return 0;
nl->inppos += framelen - 4;
if( --nl->wait_frameno == 0 ) /* last frame received */
indicate_pkt( dev );
return 1;
}
/*
* Prepare to start output on adapter.
* Transmitter will be actually activated when marker is accepted.
*/
static void
prepare_to_send( struct sk_buff *skb, struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
unsigned int len;
/* nl->tx_buf_p == NULL here! */
if( nl->tx_buf_p )
printk( KERN_ERR "%s: memory leak!\n", dev->name );
nl->outpos = 0;
nl->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
len = skb->len;
if( len < SBNI_MIN_LEN )
len = SBNI_MIN_LEN;
nl->tx_buf_p = skb;
nl->tx_frameno = (len + nl->maxframe - 1) / nl->maxframe;
nl->framelen = len < nl->maxframe ? len : nl->maxframe;
outb( inb( dev->base_addr + CSR0 ) | TR_REQ, dev->base_addr + CSR0 );
#ifdef CONFIG_SBNI_MULTILINE
nl->master->trans_start = jiffies;
#else
dev->trans_start = jiffies;
#endif
}
static void
drop_xmit_queue( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
if( nl->tx_buf_p )
dev_kfree_skb_any( nl->tx_buf_p ),
nl->tx_buf_p = NULL,
#ifdef CONFIG_SBNI_MULTILINE
((struct net_local *) nl->master->priv)
->stats.tx_errors++,
((struct net_local *) nl->master->priv)
->stats.tx_carrier_errors++;
#else
nl->stats.tx_errors++,
nl->stats.tx_carrier_errors++;
#endif
nl->tx_frameno = 0;
nl->framelen = 0;
nl->outpos = 0;
nl->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
#ifdef CONFIG_SBNI_MULTILINE
netif_start_queue( nl->master );
nl->master->trans_start = jiffies;
#else
netif_start_queue( dev );
dev->trans_start = jiffies;
#endif
}
static void
send_frame_header( struct net_device *dev, u32 *crc_p )
{
struct net_local *nl = (struct net_local *) dev->priv;
u32 crc = *crc_p;
u32 len_field = nl->framelen + 6; /* CRC + frameno + reserved */
u8 value;
if( nl->state & FL_NEED_RESEND )
len_field |= FRAME_RETRY; /* non-first attempt... */
if( nl->outpos == 0 )
len_field |= FRAME_FIRST;
len_field |= (nl->state & FL_PREV_OK) ? FRAME_SENT_OK : FRAME_SENT_BAD;
outb( SBNI_SIG, dev->base_addr + DAT );
value = (u8) len_field;
outb( value, dev->base_addr + DAT );
crc = CRC32( value, crc );
value = (u8) (len_field >> 8);
outb( value, dev->base_addr + DAT );
crc = CRC32( value, crc );
outb( nl->tx_frameno, dev->base_addr + DAT );
crc = CRC32( nl->tx_frameno, crc );
outb( 0, dev->base_addr + DAT );
crc = CRC32( 0, crc );
*crc_p = crc;
}
/*
* if frame tail not needed (incorrect number or received twice),
* it won't store, but CRC will be calculated
*/
static int
skip_tail( unsigned int ioaddr, unsigned int tail_len, u32 crc )
{
while( tail_len-- )
crc = CRC32( inb( ioaddr + DAT ), crc );
return crc == CRC32_REMAINDER;
}
/*
* Preliminary checks if frame header is correct, calculates its CRC
* and split it to simple fields
*/
static int
check_fhdr( u32 ioaddr, u32 *framelen, u32 *frameno, u32 *ack,
u32 *is_first, u32 *crc_p )
{
u32 crc = *crc_p;
u8 value;
if( inb( ioaddr + DAT ) != SBNI_SIG )
return 0;
value = inb( ioaddr + DAT );
*framelen = (u32)value;
crc = CRC32( value, crc );
value = inb( ioaddr + DAT );
*framelen |= ((u32)value) << 8;
crc = CRC32( value, crc );
*ack = *framelen & FRAME_ACK_MASK;
*is_first = (*framelen & FRAME_FIRST) != 0;
if( (*framelen &= FRAME_LEN_MASK) < 6
|| *framelen > SBNI_MAX_FRAME - 3 )
return 0;
value = inb( ioaddr + DAT );
*frameno = (u32)value;
crc = CRC32( value, crc );
crc = CRC32( inb( ioaddr + DAT ), crc ); /* reserved byte */
*framelen -= 2;
*crc_p = crc;
return 1;
}
static struct sk_buff *
get_rx_buf( struct net_device *dev )
{
/* +2 is to compensate for the alignment fixup below */
struct sk_buff *skb = dev_alloc_skb( ETHER_MAX_LEN + 2 );
if( !skb )
return NULL;
#ifdef CONFIG_SBNI_MULTILINE
skb->dev = ((struct net_local *) dev->priv)->master;
#else
skb->dev = dev;
#endif
skb_reserve( skb, 2 ); /* Align IP on longword boundaries */
return skb;
}
static void
indicate_pkt( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
struct sk_buff *skb = nl->rx_buf_p;
skb_put( skb, nl->inppos );
#ifdef CONFIG_SBNI_MULTILINE
skb->protocol = eth_type_trans( skb, nl->master );
netif_rx( skb );
dev->last_rx = jiffies;
++((struct net_local *) nl->master->priv)->stats.rx_packets;
((struct net_local *) nl->master->priv)->stats.rx_bytes += nl->inppos;
#else
skb->protocol = eth_type_trans( skb, dev );
netif_rx( skb );
dev->last_rx = jiffies;
++nl->stats.rx_packets;
nl->stats.rx_bytes += nl->inppos;
#endif
nl->rx_buf_p = NULL; /* protocol driver will clear this sk_buff */
}
/* -------------------------------------------------------------------------- */
/*
* Routine checks periodically wire activity and regenerates marker if
* connect was inactive for a long time.
*/
static void
sbni_watchdog( unsigned long arg )
{
struct net_device *dev = (struct net_device *) arg;
struct net_local *nl = (struct net_local *) dev->priv;
struct timer_list *w = &nl->watchdog;
unsigned long flags;
unsigned char csr0;
spin_lock_irqsave( &nl->lock, flags );
csr0 = inb( dev->base_addr + CSR0 );
if( csr0 & RC_CHK ) {
if( nl->timer_ticks ) {
if( csr0 & (RC_RDY | BU_EMP) )
/* receiving not active */
nl->timer_ticks--;
} else {
nl->in_stats.timeout_number++;
if( nl->delta_rxl )
timeout_change_level( dev );
outb( *(u_char *)&nl->csr1 | PR_RES,
dev->base_addr + CSR1 );
csr0 = inb( dev->base_addr + CSR0 );
}
} else
nl->state &= ~FL_LINE_DOWN;
outb( csr0 | RC_CHK, dev->base_addr + CSR0 );
init_timer( w );
w->expires = jiffies + SBNI_TIMEOUT;
w->data = arg;
w->function = sbni_watchdog;
add_timer( w );
spin_unlock_irqrestore( &nl->lock, flags );
}
static unsigned char rxl_tab[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08,
0x0a, 0x0c, 0x0f, 0x16, 0x18, 0x1a, 0x1c, 0x1f
};
#define SIZE_OF_TIMEOUT_RXL_TAB 4
static unsigned char timeout_rxl_tab[] = {
0x03, 0x05, 0x08, 0x0b
};
/* -------------------------------------------------------------------------- */
static void
card_start( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
nl->timer_ticks = CHANGE_LEVEL_START_TICKS;
nl->state &= ~(FL_WAIT_ACK | FL_NEED_RESEND);
nl->state |= FL_PREV_OK;
nl->inppos = nl->outpos = 0;
nl->wait_frameno = 0;
nl->tx_frameno = 0;
nl->framelen = 0;
outb( *(u_char *)&nl->csr1 | PR_RES, dev->base_addr + CSR1 );
outb( EN_INT, dev->base_addr + CSR0 );
}
/* -------------------------------------------------------------------------- */
/* Receive level auto-selection */
static void
change_level( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
if( nl->delta_rxl == 0 ) /* do not auto-negotiate RxL */
return;
if( nl->cur_rxl_index == 0 )
nl->delta_rxl = 1;
else if( nl->cur_rxl_index == 15 )
nl->delta_rxl = -1;
else if( nl->cur_rxl_rcvd < nl->prev_rxl_rcvd )
nl->delta_rxl = -nl->delta_rxl;
nl->csr1.rxl = rxl_tab[ nl->cur_rxl_index += nl->delta_rxl ];
inb( dev->base_addr + CSR0 ); /* needs for PCI cards */
outb( *(u8 *)&nl->csr1, dev->base_addr + CSR1 );
nl->prev_rxl_rcvd = nl->cur_rxl_rcvd;
nl->cur_rxl_rcvd = 0;
}
static void
timeout_change_level( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
nl->cur_rxl_index = timeout_rxl_tab[ nl->timeout_rxl ];
if( ++nl->timeout_rxl >= 4 )
nl->timeout_rxl = 0;
nl->csr1.rxl = rxl_tab[ nl->cur_rxl_index ];
inb( dev->base_addr + CSR0 );
outb( *(unsigned char *)&nl->csr1, dev->base_addr + CSR1 );
nl->prev_rxl_rcvd = nl->cur_rxl_rcvd;
nl->cur_rxl_rcvd = 0;
}
/* -------------------------------------------------------------------------- */
/*
* Open/initialize the board.
*/
static int
sbni_open( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
struct timer_list *w = &nl->watchdog;
/*
* For double ISA adapters within "common irq" mode, we have to
* determine whether primary or secondary channel is initialized,
* and set the irq handler only in first case.
*/
if( dev->base_addr < 0x400 ) { /* ISA only */
struct net_device **p = sbni_cards;
for( ; *p && p < sbni_cards + SBNI_MAX_NUM_CARDS; ++p )
if( (*p)->irq == dev->irq
&& ((*p)->base_addr == dev->base_addr + 4
|| (*p)->base_addr == dev->base_addr - 4)
&& (*p)->flags & IFF_UP ) {
((struct net_local *) ((*p)->priv))
->second = dev;
printk( KERN_NOTICE "%s: using shared irq "
"with %s\n", dev->name, (*p)->name );
nl->state |= FL_SECONDARY;
goto handler_attached;
}
}
if( request_irq(dev->irq, sbni_interrupt, IRQF_SHARED, dev->name, dev) ) {
printk( KERN_ERR "%s: unable to get IRQ %d.\n",
dev->name, dev->irq );
return -EAGAIN;
}
handler_attached:
spin_lock( &nl->lock );
memset( &nl->stats, 0, sizeof(struct net_device_stats) );
memset( &nl->in_stats, 0, sizeof(struct sbni_in_stats) );
card_start( dev );
netif_start_queue( dev );
/* set timer watchdog */
init_timer( w );
w->expires = jiffies + SBNI_TIMEOUT;
w->data = (unsigned long) dev;
w->function = sbni_watchdog;
add_timer( w );
spin_unlock( &nl->lock );
return 0;
}
static int
sbni_close( struct net_device *dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
if( nl->second && nl->second->flags & IFF_UP ) {
printk( KERN_NOTICE "Secondary channel (%s) is active!\n",
nl->second->name );
return -EBUSY;
}
#ifdef CONFIG_SBNI_MULTILINE
if( nl->state & FL_SLAVE )
emancipate( dev );
else
while( nl->link ) /* it's master device! */
emancipate( nl->link );
#endif
spin_lock( &nl->lock );
nl->second = NULL;
drop_xmit_queue( dev );
netif_stop_queue( dev );
del_timer( &nl->watchdog );
outb( 0, dev->base_addr + CSR0 );
if( !(nl->state & FL_SECONDARY) )
free_irq( dev->irq, dev );
nl->state &= FL_SECONDARY;
spin_unlock( &nl->lock );
return 0;
}
/*
Valid combinations in CSR0 (for probing):
VALID_DECODER 0000,0011,1011,1010
; 0 ; -
TR_REQ ; 1 ; +
TR_RDY ; 2 ; -
TR_RDY TR_REQ ; 3 ; +
BU_EMP ; 4 ; +
BU_EMP TR_REQ ; 5 ; +
BU_EMP TR_RDY ; 6 ; -
BU_EMP TR_RDY TR_REQ ; 7 ; +
RC_RDY ; 8 ; +
RC_RDY TR_REQ ; 9 ; +
RC_RDY TR_RDY ; 10 ; -
RC_RDY TR_RDY TR_REQ ; 11 ; -
RC_RDY BU_EMP ; 12 ; -
RC_RDY BU_EMP TR_REQ ; 13 ; -
RC_RDY BU_EMP TR_RDY ; 14 ; -
RC_RDY BU_EMP TR_RDY TR_REQ ; 15 ; -
*/
#define VALID_DECODER (2 + 8 + 0x10 + 0x20 + 0x80 + 0x100 + 0x200)
static int
sbni_card_probe( unsigned long ioaddr )
{
unsigned char csr0;
csr0 = inb( ioaddr + CSR0 );
if( csr0 != 0xff && csr0 != 0x00 ) {
csr0 &= ~EN_INT;
if( csr0 & BU_EMP )
csr0 |= EN_INT;
if( VALID_DECODER & (1 << (csr0 >> 4)) )
return 0;
}
return -ENODEV;
}
/* -------------------------------------------------------------------------- */
static int
sbni_ioctl( struct net_device *dev, struct ifreq *ifr, int cmd )
{
struct net_local *nl = (struct net_local *) dev->priv;
struct sbni_flags flags;
int error = 0;
#ifdef CONFIG_SBNI_MULTILINE
struct net_device *slave_dev;
char slave_name[ 8 ];
#endif
switch( cmd ) {
case SIOCDEVGETINSTATS :
if (copy_to_user( ifr->ifr_data, &nl->in_stats,
sizeof(struct sbni_in_stats) ))
error = -EFAULT;
break;
case SIOCDEVRESINSTATS :
if( current->euid != 0 ) /* root only */
return -EPERM;
memset( &nl->in_stats, 0, sizeof(struct sbni_in_stats) );
break;
case SIOCDEVGHWSTATE :
flags.mac_addr = *(u32 *)(dev->dev_addr + 3);
flags.rate = nl->csr1.rate;
flags.slow_mode = (nl->state & FL_SLOW_MODE) != 0;
flags.rxl = nl->cur_rxl_index;
flags.fixed_rxl = nl->delta_rxl == 0;
if (copy_to_user( ifr->ifr_data, &flags, sizeof flags ))
error = -EFAULT;
break;
case SIOCDEVSHWSTATE :
if( current->euid != 0 ) /* root only */
return -EPERM;
spin_lock( &nl->lock );
flags = *(struct sbni_flags*) &ifr->ifr_ifru;
if( flags.fixed_rxl )
nl->delta_rxl = 0,
nl->cur_rxl_index = flags.rxl;
else
nl->delta_rxl = DEF_RXL_DELTA,
nl->cur_rxl_index = DEF_RXL;
nl->csr1.rxl = rxl_tab[ nl->cur_rxl_index ];
nl->csr1.rate = flags.rate;
outb( *(u8 *)&nl->csr1 | PR_RES, dev->base_addr + CSR1 );
spin_unlock( &nl->lock );
break;
#ifdef CONFIG_SBNI_MULTILINE
case SIOCDEVENSLAVE :
if( current->euid != 0 ) /* root only */
return -EPERM;
if (copy_from_user( slave_name, ifr->ifr_data, sizeof slave_name ))
return -EFAULT;
slave_dev = dev_get_by_name( slave_name );
if( !slave_dev || !(slave_dev->flags & IFF_UP) ) {
printk( KERN_ERR "%s: trying to enslave non-active "
"device %s\n", dev->name, slave_name );
return -EPERM;
}
return enslave( dev, slave_dev );
case SIOCDEVEMANSIPATE :
if( current->euid != 0 ) /* root only */
return -EPERM;
return emancipate( dev );
#endif /* CONFIG_SBNI_MULTILINE */
default :
return -EOPNOTSUPP;
}
return error;
}
#ifdef CONFIG_SBNI_MULTILINE
static int
enslave( struct net_device *dev, struct net_device *slave_dev )
{
struct net_local *nl = (struct net_local *) dev->priv;
struct net_local *snl = (struct net_local *) slave_dev->priv;
if( nl->state & FL_SLAVE ) /* This isn't master or free device */
return -EBUSY;
if( snl->state & FL_SLAVE ) /* That was already enslaved */
return -EBUSY;
spin_lock( &nl->lock );
spin_lock( &snl->lock );
/* append to list */
snl->link = nl->link;
nl->link = slave_dev;
snl->master = dev;
snl->state |= FL_SLAVE;
/* Summary statistics of MultiLine operation will be stored
in master's counters */
memset( &snl->stats, 0, sizeof(struct net_device_stats) );
netif_stop_queue( slave_dev );
netif_wake_queue( dev ); /* Now we are able to transmit */
spin_unlock( &snl->lock );
spin_unlock( &nl->lock );
printk( KERN_NOTICE "%s: slave device (%s) attached.\n",
dev->name, slave_dev->name );
return 0;
}
static int
emancipate( struct net_device *dev )
{
struct net_local *snl = (struct net_local *) dev->priv;
struct net_device *p = snl->master;
struct net_local *nl = (struct net_local *) p->priv;
if( !(snl->state & FL_SLAVE) )
return -EINVAL;
spin_lock( &nl->lock );
spin_lock( &snl->lock );
drop_xmit_queue( dev );
/* exclude from list */
for(;;) { /* must be in list */
struct net_local *t = (struct net_local *) p->priv;
if( t->link == dev ) {
t->link = snl->link;
break;
}
p = t->link;
}
snl->link = NULL;
snl->master = dev;
snl->state &= ~FL_SLAVE;
netif_start_queue( dev );
spin_unlock( &snl->lock );
spin_unlock( &nl->lock );
dev_put( dev );
return 0;
}
#endif
static struct net_device_stats *
sbni_get_stats( struct net_device *dev )
{
return &((struct net_local *) dev->priv)->stats;
}
static void
set_multicast_list( struct net_device *dev )
{
return; /* sbni always operate in promiscuos mode */
}
#ifdef MODULE
module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
module_param_array(baud, int, NULL, 0);
module_param_array(rxl, int, NULL, 0);
module_param_array(mac, int, NULL, 0);
module_param(skip_pci_probe, bool, 0);
MODULE_LICENSE("GPL");
int __init init_module( void )
{
struct net_device *dev;
int err;
while( num < SBNI_MAX_NUM_CARDS ) {
dev = alloc_netdev(sizeof(struct net_local),
"sbni%d", sbni_devsetup);
if( !dev)
break;
sprintf( dev->name, "sbni%d", num );
err = sbni_init(dev);
if (err) {
free_netdev(dev);
break;
}
if( register_netdev( dev ) ) {
release_region( dev->base_addr, SBNI_IO_EXTENT );
free_netdev( dev );
break;
}
}
return *sbni_cards ? 0 : -ENODEV;
}
void
cleanup_module( void )
{
struct net_device *dev;
int num;
for( num = 0; num < SBNI_MAX_NUM_CARDS; ++num )
if( (dev = sbni_cards[ num ]) != NULL ) {
unregister_netdev( dev );
release_region( dev->base_addr, SBNI_IO_EXTENT );
free_netdev( dev );
}
}
#else /* MODULE */
static int __init
sbni_setup( char *p )
{
int n, parm;
if( *p++ != '(' )
goto bad_param;
for( n = 0, parm = 0; *p && n < 8; ) {
(*dest[ parm ])[ n ] = simple_strtol( p, &p, 0 );
if( !*p || *p == ')' )
return 1;
if( *p == ';' )
++p, ++n, parm = 0;
else if( *p++ != ',' )
break;
else
if( ++parm >= 5 )
break;
}
bad_param:
printk( KERN_ERR "Error in sbni kernel parameter!\n" );
return 0;
}
__setup( "sbni=", sbni_setup );
#endif /* MODULE */
/* -------------------------------------------------------------------------- */
#ifdef ASM_CRC
static u32
calc_crc32( u32 crc, u8 *p, u32 len )
{
register u32 _crc;
_crc = crc;
__asm__ __volatile__ (
"xorl %%ebx, %%ebx\n"
"movl %2, %%esi\n"
"movl %3, %%ecx\n"
"movl $crc32tab, %%edi\n"
"shrl $2, %%ecx\n"
"jz 1f\n"
".align 4\n"
"0:\n"
"movb %%al, %%bl\n"
"movl (%%esi), %%edx\n"
"shrl $8, %%eax\n"
"xorb %%dl, %%bl\n"
"shrl $8, %%edx\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb %%dl, %%bl\n"
"shrl $8, %%edx\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb %%dl, %%bl\n"
"movb %%dh, %%dl\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb %%dl, %%bl\n"
"addl $4, %%esi\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"decl %%ecx\n"
"jnz 0b\n"
"1:\n"
"movl %3, %%ecx\n"
"andl $3, %%ecx\n"
"jz 2f\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb (%%esi), %%bl\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"decl %%ecx\n"
"jz 2f\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb 1(%%esi), %%bl\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"decl %%ecx\n"
"jz 2f\n"
"movb %%al, %%bl\n"
"shrl $8, %%eax\n"
"xorb 2(%%esi), %%bl\n"
"xorl (%%edi,%%ebx,4), %%eax\n"
"2:\n"
: "=a" (_crc)
: "0" (_crc), "g" (p), "g" (len)
: "bx", "cx", "dx", "si", "di"
);
return _crc;
}
#else /* ASM_CRC */
static u32
calc_crc32( u32 crc, u8 *p, u32 len )
{
while( len-- )
crc = CRC32( *p++, crc );
return crc;
}
#endif /* ASM_CRC */
static u32 crc32tab[] __attribute__ ((aligned(8))) = {
0xD202EF8D, 0xA505DF1B, 0x3C0C8EA1, 0x4B0BBE37,
0xD56F2B94, 0xA2681B02, 0x3B614AB8, 0x4C667A2E,
0xDCD967BF, 0xABDE5729, 0x32D70693, 0x45D03605,
0xDBB4A3A6, 0xACB39330, 0x35BAC28A, 0x42BDF21C,
0xCFB5FFE9, 0xB8B2CF7F, 0x21BB9EC5, 0x56BCAE53,
0xC8D83BF0, 0xBFDF0B66, 0x26D65ADC, 0x51D16A4A,
0xC16E77DB, 0xB669474D, 0x2F6016F7, 0x58672661,
0xC603B3C2, 0xB1048354, 0x280DD2EE, 0x5F0AE278,
0xE96CCF45, 0x9E6BFFD3, 0x0762AE69, 0x70659EFF,
0xEE010B5C, 0x99063BCA, 0x000F6A70, 0x77085AE6,
0xE7B74777, 0x90B077E1, 0x09B9265B, 0x7EBE16CD,
0xE0DA836E, 0x97DDB3F8, 0x0ED4E242, 0x79D3D2D4,
0xF4DBDF21, 0x83DCEFB7, 0x1AD5BE0D, 0x6DD28E9B,
0xF3B61B38, 0x84B12BAE, 0x1DB87A14, 0x6ABF4A82,
0xFA005713, 0x8D076785, 0x140E363F, 0x630906A9,
0xFD6D930A, 0x8A6AA39C, 0x1363F226, 0x6464C2B0,
0xA4DEAE1D, 0xD3D99E8B, 0x4AD0CF31, 0x3DD7FFA7,
0xA3B36A04, 0xD4B45A92, 0x4DBD0B28, 0x3ABA3BBE,
0xAA05262F, 0xDD0216B9, 0x440B4703, 0x330C7795,
0xAD68E236, 0xDA6FD2A0, 0x4366831A, 0x3461B38C,
0xB969BE79, 0xCE6E8EEF, 0x5767DF55, 0x2060EFC3,
0xBE047A60, 0xC9034AF6, 0x500A1B4C, 0x270D2BDA,
0xB7B2364B, 0xC0B506DD, 0x59BC5767, 0x2EBB67F1,
0xB0DFF252, 0xC7D8C2C4, 0x5ED1937E, 0x29D6A3E8,
0x9FB08ED5, 0xE8B7BE43, 0x71BEEFF9, 0x06B9DF6F,
0x98DD4ACC, 0xEFDA7A5A, 0x76D32BE0, 0x01D41B76,
0x916B06E7, 0xE66C3671, 0x7F6567CB, 0x0862575D,
0x9606C2FE, 0xE101F268, 0x7808A3D2, 0x0F0F9344,
0x82079EB1, 0xF500AE27, 0x6C09FF9D, 0x1B0ECF0B,
0x856A5AA8, 0xF26D6A3E, 0x6B643B84, 0x1C630B12,
0x8CDC1683, 0xFBDB2615, 0x62D277AF, 0x15D54739,
0x8BB1D29A, 0xFCB6E20C, 0x65BFB3B6, 0x12B88320,
0x3FBA6CAD, 0x48BD5C3B, 0xD1B40D81, 0xA6B33D17,
0x38D7A8B4, 0x4FD09822, 0xD6D9C998, 0xA1DEF90E,
0x3161E49F, 0x4666D409, 0xDF6F85B3, 0xA868B525,
0x360C2086, 0x410B1010, 0xD80241AA, 0xAF05713C,
0x220D7CC9, 0x550A4C5F, 0xCC031DE5, 0xBB042D73,
0x2560B8D0, 0x52678846, 0xCB6ED9FC, 0xBC69E96A,
0x2CD6F4FB, 0x5BD1C46D, 0xC2D895D7, 0xB5DFA541,
0x2BBB30E2, 0x5CBC0074, 0xC5B551CE, 0xB2B26158,
0x04D44C65, 0x73D37CF3, 0xEADA2D49, 0x9DDD1DDF,
0x03B9887C, 0x74BEB8EA, 0xEDB7E950, 0x9AB0D9C6,
0x0A0FC457, 0x7D08F4C1, 0xE401A57B, 0x930695ED,
0x0D62004E, 0x7A6530D8, 0xE36C6162, 0x946B51F4,
0x19635C01, 0x6E646C97, 0xF76D3D2D, 0x806A0DBB,
0x1E0E9818, 0x6909A88E, 0xF000F934, 0x8707C9A2,
0x17B8D433, 0x60BFE4A5, 0xF9B6B51F, 0x8EB18589,
0x10D5102A, 0x67D220BC, 0xFEDB7106, 0x89DC4190,
0x49662D3D, 0x3E611DAB, 0xA7684C11, 0xD06F7C87,
0x4E0BE924, 0x390CD9B2, 0xA0058808, 0xD702B89E,
0x47BDA50F, 0x30BA9599, 0xA9B3C423, 0xDEB4F4B5,
0x40D06116, 0x37D75180, 0xAEDE003A, 0xD9D930AC,
0x54D13D59, 0x23D60DCF, 0xBADF5C75, 0xCDD86CE3,
0x53BCF940, 0x24BBC9D6, 0xBDB2986C, 0xCAB5A8FA,
0x5A0AB56B, 0x2D0D85FD, 0xB404D447, 0xC303E4D1,
0x5D677172, 0x2A6041E4, 0xB369105E, 0xC46E20C8,
0x72080DF5, 0x050F3D63, 0x9C066CD9, 0xEB015C4F,
0x7565C9EC, 0x0262F97A, 0x9B6BA8C0, 0xEC6C9856,
0x7CD385C7, 0x0BD4B551, 0x92DDE4EB, 0xE5DAD47D,
0x7BBE41DE, 0x0CB97148, 0x95B020F2, 0xE2B71064,
0x6FBF1D91, 0x18B82D07, 0x81B17CBD, 0xF6B64C2B,
0x68D2D988, 0x1FD5E91E, 0x86DCB8A4, 0xF1DB8832,
0x616495A3, 0x1663A535, 0x8F6AF48F, 0xF86DC419,
0x660951BA, 0x110E612C, 0x88073096, 0xFF000000
};
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