tools/firewire: add userspace front-end of nosy

This adds nosy-dump, the userspace part of nosy, the IEEE 1394 traffic
sniffer for Texas Instruments PCILynx/ PCILynx2 based cards.  Author is
Kristian Høgsberg.

The files added here are taken from
git://anongit.freedesktop.org/~krh/nosy commit ee29be97 (2009-11-10)
with the following changes by Stefan Richter:
  - Parts pertaining to the kernel module removed from Makefile.
  - dist target removed from the Makefile.
  - Mentioned nosy-dump in the Kconfig help to nosy's kernel component.
  - Add copyright notice to nosy-dump.c.  This is a duplicate of the
    respective notice in the kernel component nosy.c except for a time
    span of 2002 - 2006, according to Kristian's git log.

"git shortlog decode-fcp.c list.h nosy-dump.[ch]" from nosy's git
repository:

Jonathan Woithe (1):
      Save logs on Ctrl-C

Kristian Høgsberg (11):
      Pull over nosy from mercurial repo.
      Remove some fields from default view, add logging feature.
      Use infinite time out for poll(), mark more detail fields.
      Fix byte ordering macro.
      Add decoding of iso data and lock packets.
      Add flag to indicate data length field.
      Add cycle start packet decoding, add --iso and --cycle-start flags.
      Distinguish between phy-packets and 0-length iso data.
      Fix transaction and stats view.
      Add simple AV/C decoder.
      Don't break down on big payloads.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: Kristian Høgsberg <krh@bitplanet.net>

1 files changed, 1037 insertions, 0 deletions

diff --git a/tools/firewire/nosy-dump.c b/tools/firewire/nosy-dump.c
new file mode 100644
index 000000000000..64e5ea438928
--- /dev/null
+++ b/tools/firewire/nosy-dump.c
@@ -0,0 +1,1037 @@
+/* -*- mode: c; c-basic-offset: 2 -*- */
+
+/*
+ * nosy-dump - Interface to snoop mode driver for TI PCILynx 1394 controllers
+ * Copyright (C) 2002-2006 Kristian Høgsberg
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <endian.h>
+#include <popt.h>
+#include <poll.h>
+#include <byteswap.h>
+#include <termios.h>
+
+#include <signal.h>
+
+#include "list.h"
+#include "nosy-user.h"
+#include "nosy-dump.h"
+
+enum {
+  PACKET_FIELD_DETAIL		= 0x01,
+  PACKET_FIELD_DATA_LENGTH	= 0x02,
+  /* Marks the fields we print in transaction view. */
+  PACKET_FIELD_TRANSACTION	= 0x04
+};
+
+static void
+print_packet(unsigned long *data, size_t length);
+static void
+decode_link_packet(struct link_packet *packet, size_t length,
+		   int include_flags, int exclude_flags);
+
+static int   run = 1;
+sig_t sys_sigint_handler;
+
+static char *option_nosy_device = "/dev/nosy";
+static char *option_view = "packet";
+static char *option_output = NULL;
+static char *option_input = NULL;
+static int   option_hex;
+static int   option_iso;
+static int   option_cycle_start;
+static int   option_version;
+static int   option_verbose;
+
+enum {
+  VIEW_TRANSACTION,
+  VIEW_PACKET,
+  VIEW_STATS
+};
+
+static const struct poptOption options[] = {
+  {
+    longName:	"device",
+    shortName:	'd',
+    argInfo:	POPT_ARG_STRING,
+    arg:	&option_nosy_device,
+    descrip:	"Path to nosy device.",
+    argDescrip:	"DEVICE"
+  },
+  {
+    longName:	"view",
+    argInfo:	POPT_ARG_STRING,
+    arg:	&option_view,
+    descrip:	"Specify view of bus traffic: packet, transaction or stats.",
+    argDescrip:	"VIEW"
+  },
+  {
+    longName:	"hex",
+    shortName:	'x',
+    argInfo:	POPT_ARG_NONE,
+    arg:	&option_hex,
+    descrip:	"Print each packet in hex.",
+  },
+  {
+    longName:	"iso",
+    argInfo:	POPT_ARG_NONE,
+    arg:	&option_iso,
+    descrip:	"Print iso packets.",
+  },
+  {
+    longName:	"cycle-start",
+    argInfo:	POPT_ARG_NONE,
+    arg:	&option_cycle_start,
+    descrip:	"Print cycle start packets.",
+  },
+  {
+    longName:	"verbose",
+    shortName:	'v',
+    argInfo:	POPT_ARG_NONE,
+    arg:	&option_verbose,
+    descrip:	"Verbose packet view.",
+  },
+  {
+    longName:	"output",
+    shortName:	'o',
+    argInfo:	POPT_ARG_STRING,
+    arg:	&option_output,
+    descrip:	"Log to output file.",
+    argDescrip:	"FILENAME"
+  },
+  {
+    longName:	"input",
+    shortName:	'i',
+    argInfo:	POPT_ARG_STRING,
+    arg:	&option_input,
+    descrip:	"Decode log from file.",
+    argDescrip:	"FILENAME"
+  },
+  {
+    longName:	"version",
+    argInfo:	POPT_ARG_NONE,
+    arg:	&option_version,
+    descrip:	"Specify print version info.",
+  },
+  POPT_AUTOHELP
+  POPT_TABLEEND
+};
+
+void 
+sigint_handler(int signal_num)
+{
+  if (run == 1) {
+    run = 0;
+    /* Allow all Ctrl-C's except the first to interrupt the program in
+     * the usual way.
+     */
+    signal(SIGINT, SIG_DFL);
+  }
+}
+
+struct subaction *
+subaction_create(unsigned long *data, size_t length)
+{
+  struct subaction *sa;
+
+  /* we put the ack in the subaction struct for easy access. */
+  sa = malloc(sizeof *sa - sizeof sa->packet + length);
+  sa->ack = data[length / 4 - 1];
+  sa->length = length;
+  memcpy (&sa->packet, data, length);
+
+  return sa;
+}
+
+void
+subaction_destroy(struct subaction *sa)
+{
+  free(sa);
+}
+
+struct list pending_transaction_list =
+  { &pending_transaction_list, &pending_transaction_list };
+
+struct link_transaction *
+link_transaction_lookup(int request_node, int response_node, int tlabel)
+{
+  struct link_transaction *t;
+
+  list_for_each_entry(t, &pending_transaction_list, link) {
+    if (t->request_node == request_node &&
+	t->response_node == response_node &&
+	t->tlabel == tlabel)
+      return t;
+  }
+
+  t = malloc(sizeof *t);
+  t->request_node = request_node;
+  t->response_node = response_node;
+  t->tlabel = tlabel;
+  list_init(&t->request_list);
+  list_init(&t->response_list);
+  
+  list_append(&pending_transaction_list, &t->link);
+  
+  return t;
+}
+
+void
+link_transaction_destroy(struct link_transaction *t)
+{
+  while (!list_empty(&t->request_list)) {
+    struct subaction *sa = list_head(&t->request_list, struct subaction, link);
+    list_remove(&sa->link);
+    subaction_destroy(sa);
+  }    
+
+  while (!list_empty(&t->response_list)) {
+    struct subaction *sa = list_head(&t->response_list, struct subaction, link);
+    list_remove(&sa->link);
+    subaction_destroy(sa);
+  }    
+  
+  free(t);
+}
+
+struct protocol_decoder {
+  const char *name;
+  int (*decode)(struct link_transaction *t);
+};
+
+static struct protocol_decoder protocol_decoders[] = {
+  { "FCP", decode_fcp }
+};
+
+void
+handle_transaction(struct link_transaction *t)
+{
+  struct subaction *sa;
+  int i;
+
+  for (i = 0; i < array_length(protocol_decoders); i++)
+    if (protocol_decoders[i].decode(t))
+      break;
+
+  /* HACK: decode only fcp right now. */
+  return;
+
+  decode_link_packet(&t->request->packet, t->request->length,
+		     PACKET_FIELD_TRANSACTION, 0);
+  if (t->response)
+    decode_link_packet(&t->response->packet, t->request->length,
+		       PACKET_FIELD_TRANSACTION, 0);
+  else
+    printf("[no response]");
+
+  if (option_verbose) {
+    list_for_each_entry(sa, &t->request_list, link)
+      print_packet((unsigned long *) &sa->packet, sa->length);
+    list_for_each_entry(sa, &t->response_list, link)
+      print_packet((unsigned long *) &sa->packet, sa->length);
+  }
+  printf("\r\n");
+
+  link_transaction_destroy(t);
+}
+
+void
+clear_pending_transaction_list(void)
+{
+  struct link_transaction *t;
+
+  while (!list_empty(&pending_transaction_list)) {
+    t = list_head(&pending_transaction_list, struct link_transaction, link);
+    list_remove(&t->link);
+    link_transaction_destroy(t);
+    /* print unfinished transactions */
+  }    
+}
+
+static const char * const tcode_names[] = {
+  "write_quadlet_request",
+  "write_block_request",
+  "write_response",
+  "reserved",
+  "read_quadlet_request",
+  "read_block_request",
+  "read_quadlet_response",
+  "read_block_response",
+  "cycle_start",
+  "lock_request",
+  "iso_data",
+  "lock_response"
+};
+
+static const char * const ack_names[] = {
+  "no ack",
+  "ack_complete",
+  "ack_pending",
+  "reserved (0x03)",
+  "ack_busy_x",
+  "ack_busy_a",
+  "ack_busy_b",
+  "reserved (0x07)",
+  "reserved (0x08)",
+  "reserved (0x09)",
+  "reserved (0x0a)",
+  "reserved (0x0b)",
+  "reserved (0x0c)",
+  "ack_data_error",
+  "ack_type_error",
+  "reserved (0x0f)",
+};
+
+static const char * const rcode_names[] = {
+  "complete",
+  "reserved (0x01)",
+  "reserved (0x02)",
+  "reserved (0x03)",
+  "conflict_error",
+  "data_error",
+  "type_error",
+  "address_error",
+};
+
+static const char * const retry_names[] = {
+  "retry_1",
+  "retry_x",
+  "retry_a",
+  "retry_b",
+};
+
+enum {
+  PACKET_RESERVED,
+  PACKET_REQUEST,
+  PACKET_RESPONSE,
+  PACKET_OTHER,
+};
+
+struct packet_info {
+  const char *name;
+  int type;
+  int response_tcode;
+  struct packet_field *fields;
+  int field_count;
+};
+
+struct packet_field {
+  const char *name;	/* Short name for field. */
+  int offset;		/* Location of field, specified in bits.
+			 * Negative means from end of packet */
+  int width;		/* Width of field, 0 means use data_length. */
+  int flags;		/* Show options. */
+  const char * const *value_names;
+};
+
+#define COMMON_REQUEST_FIELDS					\
+  { "dest", 0, 16, PACKET_FIELD_TRANSACTION },			\
+  { "tl", 16, 6 },						\
+  { "rt", 22, 2, PACKET_FIELD_DETAIL, retry_names },		\
+  { "tcode", 24, 4, PACKET_FIELD_TRANSACTION, tcode_names },	\
+  { "pri", 28, 4, PACKET_FIELD_DETAIL },			\
+  { "src", 32, 16, PACKET_FIELD_TRANSACTION },			\
+  { "offs", 48, 48, PACKET_FIELD_TRANSACTION }
+
+#define COMMON_RESPONSE_FIELDS					\
+  { "dest", 0, 16 },						\
+  { "tl", 16, 6 },						\
+  { "rt", 22, 2, PACKET_FIELD_DETAIL, retry_names },		\
+  { "tcode", 24, 4, 0, tcode_names },				\
+  { "pri", 28, 4, PACKET_FIELD_DETAIL },			\
+  { "src", 32, 16 },						\
+  { "rcode", 48, 4, PACKET_FIELD_TRANSACTION, rcode_names }
+
+struct packet_field read_quadlet_request_fields[] = {
+  COMMON_REQUEST_FIELDS,
+  { "crc", 96, 32, PACKET_FIELD_DETAIL },
+  { "ack", 156, 4, 0, ack_names }
+};
+
+struct packet_field read_quadlet_response_fields[] = {
+  COMMON_RESPONSE_FIELDS,
+  { "data", 96, 32, PACKET_FIELD_TRANSACTION },
+  { "crc", 128, 32, PACKET_FIELD_DETAIL },
+  { "ack", 188, 4, 0, ack_names }
+};
+
+struct packet_field read_block_request_fields[] = {
+  COMMON_REQUEST_FIELDS,
+  { "data_length", 96, 16, PACKET_FIELD_TRANSACTION },
+  { "extended_tcode", 112, 16 },
+  { "crc", 128, 32, PACKET_FIELD_DETAIL },
+  { "ack", 188, 4, 0, ack_names },
+};
+
+struct packet_field block_response_fields[] = {
+  COMMON_RESPONSE_FIELDS,
+  { "data_length", 96, 16, PACKET_FIELD_DATA_LENGTH },
+  { "extended_tcode", 112, 16 },
+  { "crc", 128, 32, PACKET_FIELD_DETAIL },
+  { "data", 160, 0, PACKET_FIELD_TRANSACTION },
+  { "crc", -64, 32, PACKET_FIELD_DETAIL },
+  { "ack", -4, 4, 0, ack_names }
+};
+
+struct packet_field write_quadlet_request_fields[] = {
+  COMMON_REQUEST_FIELDS,
+  { "data", 96, 32, PACKET_FIELD_TRANSACTION },
+  { "ack", -4, 4, 0, ack_names }
+};
+
+struct packet_field block_request_fields[] = {
+  COMMON_REQUEST_FIELDS,
+  { "data_length", 96, 16, PACKET_FIELD_DATA_LENGTH | PACKET_FIELD_TRANSACTION },
+  { "extended_tcode", 112, 16, PACKET_FIELD_TRANSACTION },
+  { "crc", 128, 32, PACKET_FIELD_DETAIL },
+  { "data", 160, 0, PACKET_FIELD_TRANSACTION },
+  { "crc", -64, 32, PACKET_FIELD_DETAIL },
+  { "ack", -4, 4, 0, ack_names }
+};
+
+struct packet_field write_response_fields[] = {
+  COMMON_RESPONSE_FIELDS,
+  { "reserved", 64, 32, PACKET_FIELD_DETAIL },
+  { "ack", -4, 4, 0, ack_names }
+};
+
+struct packet_field iso_data_fields[] = {
+  { "data_length", 0, 16, PACKET_FIELD_DATA_LENGTH },
+  { "tag", 16, 2 },
+  { "channel", 18, 6 },
+  { "tcode", 24, 4, 0, tcode_names },
+  { "sy", 28, 4 },
+  { "crc", 32, 32, PACKET_FIELD_DETAIL },
+  { "data", 64, 0 },
+  { "crc", -64, 32, PACKET_FIELD_DETAIL },
+  { "ack", -4, 4, 0, ack_names }
+};
+
+static struct packet_info packet_info[] = {
+  {
+    .name =		"write_quadlet_request",
+    .type =		PACKET_REQUEST,
+    .response_tcode =	TCODE_WRITE_RESPONSE,
+    .fields =		write_quadlet_request_fields,
+    .field_count =	array_length(write_quadlet_request_fields)
+  },
+  {
+    .name =		"write_block_request",
+    .type =		PACKET_REQUEST,
+    .response_tcode = 	TCODE_WRITE_RESPONSE,
+    .fields =		block_request_fields,
+    .field_count =	array_length(block_request_fields)
+  },
+  {
+    .name =		"write_response",
+    .type =		PACKET_RESPONSE,
+    .fields =		write_response_fields,
+    .field_count =	array_length(write_response_fields)
+  },
+  {
+    .name =		"reserved",
+    .type =		PACKET_RESERVED,
+  },
+  {
+    .name =		"read_quadlet_request",
+    .type =		PACKET_REQUEST,
+    .response_tcode = 	TCODE_READ_QUADLET_RESPONSE,
+    .fields =		read_quadlet_request_fields,
+    .field_count =	array_length(read_quadlet_request_fields)
+  },
+  {
+    .name =		"read_block_request",
+    .type =		PACKET_REQUEST,
+    .response_tcode = 	TCODE_READ_BLOCK_RESPONSE,
+    .fields =		read_block_request_fields,
+    .field_count =	array_length(read_block_request_fields)
+  },
+  {
+    .name =		"read_quadlet_response",
+    .type =		PACKET_RESPONSE,
+    .fields =		read_quadlet_response_fields,
+    .field_count =	array_length(read_quadlet_response_fields)
+  },
+  {
+    .name =		"read_block_response",
+    .type =		PACKET_RESPONSE,
+    .fields =		block_response_fields,
+    .field_count =	array_length(block_response_fields)
+  },
+  {
+    .name =		"cycle_start",
+    .type =		PACKET_OTHER,
+    .fields =		write_quadlet_request_fields,
+    .field_count =	array_length(write_quadlet_request_fields)
+  },
+  {
+    .name =		"lock_request",
+    .type =		PACKET_REQUEST,
+    .fields =		block_request_fields,
+    .field_count =	array_length(block_request_fields)
+  },
+  {
+    .name =		"iso_data",
+    .type =		PACKET_OTHER,
+    .fields =		iso_data_fields,
+    .field_count =	array_length(iso_data_fields)
+  },
+  {
+    .name =		"lock_response",
+    .type =		PACKET_RESPONSE,
+    .fields =		block_response_fields,
+    .field_count =	array_length(block_response_fields)
+  }
+};
+
+int
+handle_packet(unsigned long *data, size_t length)
+{
+  if (length == 0) {
+    printf("bus reset\r\n");
+    clear_pending_transaction_list();
+  }
+  else if (length > sizeof(struct phy_packet)) {
+    struct link_packet *p = (struct link_packet *) data;
+    struct subaction *sa, *prev;
+    struct link_transaction *t;
+
+    switch (packet_info[p->common.tcode].type) {
+    case PACKET_REQUEST:
+      t = link_transaction_lookup(p->common.source, p->common.destination,
+				  p->common.tlabel);
+      sa = subaction_create(data, length);
+      t->request = sa;
+
+      if (!list_empty(&t->request_list)) {
+	prev = list_tail(&t->request_list, struct subaction, link);
+
+	if (!ACK_BUSY(prev->ack)) {
+	  /* error, we should only see ack_busy_* before the
+	   * ack_pending/ack_complete -- this is an ack_pending
+	   * instead (ack_complete would have finished the
+	   * transaction). */
+	}
+	
+	if (prev->packet.common.tcode != sa->packet.common.tcode ||
+	    prev->packet.common.tlabel != sa->packet.common.tlabel)
+	  /* memcmp() ? */
+	  /* error, these should match for retries. */;
+      }
+
+      list_append(&t->request_list, &sa->link);
+
+      switch (sa->ack) {
+      case ACK_COMPLETE:
+	if (p->common.tcode != TCODE_WRITE_QUADLET &&
+	    p->common.tcode != TCODE_WRITE_BLOCK)
+	  /* error, unified transactions only allowed for write */;
+	list_remove(&t->link);
+	handle_transaction(t);
+	break;
+
+      case ACK_NO_ACK:
+      case ACK_DATA_ERROR:
+      case ACK_TYPE_ERROR:
+	list_remove(&t->link);
+	handle_transaction(t);
+	break;
+
+      case ACK_PENDING:
+	/* request subaction phase over, wait for response. */
+	break;
+
+      case ACK_BUSY_X:
+      case ACK_BUSY_A:
+      case ACK_BUSY_B:
+	/* ok, wait for retry. */
+	/* check that retry protocol is respected. */
+	break;
+      }
+      break;
+
+    case PACKET_RESPONSE:
+      t = link_transaction_lookup(p->common.destination, p->common.source,
+				  p->common.tlabel);
+      if (list_empty(&t->request_list)) {
+	/* unsolicited response */
+      }
+
+      sa = subaction_create(data, length);
+      t->response = sa;
+
+      if (!list_empty(&t->response_list)) {
+	prev = list_tail(&t->response_list, struct subaction, link);
+
+	if (!ACK_BUSY(prev->ack))
+	  /* error, we should only see ack_busy_* before the
+	   * ack_pending/ack_complete */;
+
+	if (prev->packet.common.tcode != sa->packet.common.tcode ||
+	    prev->packet.common.tlabel != sa->packet.common.tlabel)
+	  /* use memcmp() instead? */
+	  /* error, these should match for retries. */;
+      }
+      else {
+	prev = list_tail(&t->request_list, struct subaction, link);
+	if (prev->ack != ACK_PENDING) {
+	  /* error, should not get response unless last request got
+	   * ack_pending. */
+	}
+	
+	if (packet_info[prev->packet.common.tcode].response_tcode !=
+	    sa->packet.common.tcode) {
+	  /* error, tcode mismatch */
+	}
+      }
+      
+      list_append(&t->response_list, &sa->link);
+
+      switch (sa->ack) {
+      case ACK_COMPLETE:
+      case ACK_NO_ACK:
+      case ACK_DATA_ERROR:
+      case ACK_TYPE_ERROR:
+	list_remove(&t->link);
+	handle_transaction(t);
+	/* transaction complete, remove t from pending list. */
+	break;
+
+      case ACK_PENDING:
+	/* error for responses. */
+	break;
+
+      case ACK_BUSY_X:
+      case ACK_BUSY_A:
+      case ACK_BUSY_B:
+	/* no problem, wait for next retry */
+	break;
+      }
+      
+      break;
+
+    case PACKET_OTHER:
+    case PACKET_RESERVED:
+      return 0;
+    }
+  }
+
+  return 1;
+}
+
+unsigned int get_bits(struct link_packet *packet, int offset, int width)
+{
+  unsigned long *data = (unsigned long *) packet;
+  unsigned long index, shift, mask;
+
+  index = offset / 32 + 1;
+  shift = 32 - (offset & 31) - width;
+  mask = width == 32 ? ~0 : (1 << width) - 1;
+
+  return (data[index] >> shift) & mask;
+}
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define byte_index(i) ((i) ^ 3)
+#elif __BYTE_ORDER == __BIG_ENDIAN
+#define byte_index(i) (i)
+#else
+#error unsupported byte order.
+#endif
+
+void dump_data(unsigned char *data, int length)
+{
+  int i, print_length;
+
+  if (length > 128)
+    print_length = 128;
+  else
+    print_length = length;
+
+  for (i = 0; i < print_length; i++)
+    printf("%s%02hhx",
+	   (i % 4 == 0 && i != 0) ? " " : "",
+	   data[byte_index(i)]);
+
+  if (print_length < length)
+    printf(" (%d more bytes)", length - print_length);
+}
+
+static void
+decode_link_packet(struct link_packet *packet, size_t length,
+		   int include_flags, int exclude_flags)
+{
+  struct packet_info *pi;
+  int data_length = 0;
+  int i;
+
+  pi = &packet_info[packet->common.tcode];
+
+  for (i = 0; i < pi->field_count; i++) {
+    struct packet_field *f = &pi->fields[i];
+    int offset;
+
+    if (f->flags & exclude_flags)
+      continue;
+    if (include_flags && !(f->flags & include_flags))
+      continue;
+
+    if (f->offset < 0)
+      offset = length * 8 + f->offset - 32;
+    else
+      offset = f->offset;
+
+    if (f->value_names != NULL) {
+      unsigned long bits;
+
+      bits = get_bits(packet, offset, f->width);
+      printf("%s", f->value_names[bits]);
+    }
+    else if (f->width == 0) {
+      printf("%s=[", f->name);
+      dump_data((unsigned char *) packet + (offset / 8 + 4), data_length);
+      printf("]");
+    }
+    else {
+      unsigned long long bits;
+      int high_width, low_width;
+
+      if ((offset & ~31) != ((offset + f->width - 1) & ~31)) {
+	/* Bit field spans quadlet boundary. */
+	high_width = ((offset + 31) & ~31) - offset;
+	low_width = f->width - high_width;
+
+	bits = get_bits(packet, offset, high_width);
+	bits = (bits << low_width) |
+	  get_bits(packet, offset + high_width, low_width);
+      }
+      else
+	bits = get_bits(packet, offset, f->width);
+
+      printf("%s=0x%0*llx", f->name, (f->width + 3) / 4, bits);
+
+      if (f->flags & PACKET_FIELD_DATA_LENGTH)
+	data_length = bits;
+    }
+
+    if (i < pi->field_count - 1)
+      printf(", ");
+  }
+}
+
+static void
+print_packet(unsigned long *data, size_t length)
+{
+  int i;
+
+  printf("%6lu  ", data[0]);
+
+  if (length == 4)
+    printf("bus reset");
+  else if (length < sizeof(struct phy_packet)) {
+    printf("short packet: ");
+    for (i = 1; i < length / 4; i++)
+      printf("%s%08lx", i == 0 ? "[" : " ", data[i]);
+    printf("]");
+
+  }
+  else if (length == sizeof(struct phy_packet) && data[1] == ~data[2]) {
+    struct phy_packet *pp = (struct phy_packet *) data;
+
+    /* phy packet are 3 quadlets: the 1 quadlet payload,
+     * the bitwise inverse of the payload and the snoop
+     * mode ack */
+
+    switch (pp->common.identifier) {
+    case PHY_PACKET_CONFIGURATION:
+      if (!pp->phy_config.set_root && !pp->phy_config.set_gap_count) {
+	printf("ext phy config: phy_id=%02x", pp->phy_config.root_id);
+      }
+      else {
+	printf("phy config:");
+	if (pp->phy_config.set_root)
+	  printf(" set_root_id=%02x", pp->phy_config.root_id);
+	if (pp->phy_config.set_gap_count)
+	  printf(" set_gap_count=%d", pp->phy_config.gap_count);
+      }
+      break;
+
+    case PHY_PACKET_LINK_ON:
+      printf("link-on packet, phy_id=%02x", pp->link_on.phy_id);
+      break;
+
+    case PHY_PACKET_SELF_ID:
+      if (pp->self_id.extended) {
+	printf("extended self id: phy_id=%02x, seq=%d",
+	       pp->ext_self_id.phy_id, pp->ext_self_id.sequence);
+      }
+      else {
+	static const char * const speed_names[] = {
+	  "S100", "S200", "S400", "BETA"
+	};
+	printf("self id: phy_id=%02x, link %s, gap_count=%d, speed=%s%s%s", 
+	       pp->self_id.phy_id,
+	       (pp->self_id.link_active ? "active" : "not active"),
+	       pp->self_id.gap_count,
+	       speed_names[pp->self_id.phy_speed],
+	       (pp->self_id.contender ? ", irm contender" : ""),
+	       (pp->self_id.initiated_reset ? ", initiator" : ""));
+	       
+      }
+      break;
+    default:
+      printf("unknown phy packet: ");
+      for (i = 1; i < length / 4; i++)
+	printf("%s%08lx", i == 0 ? "[" : " ", data[i]);
+      printf("]");
+      break;
+    }
+  }
+  else {
+    struct link_packet *packet = (struct link_packet *) data;
+
+    decode_link_packet(packet, length, 0,
+		       option_verbose ? 0 : PACKET_FIELD_DETAIL);
+  }
+
+  if (option_hex) {
+    printf("  [");
+    dump_data((unsigned char *) data + 4, length - 4);
+    printf("]");
+  }
+
+  printf("\r\n");
+}
+
+#define HIDE_CURSOR	"\033[?25l"
+#define SHOW_CURSOR	"\033[?25h"
+#define CLEAR		"\033[H\033[2J"
+
+static void
+print_stats(unsigned long *data, size_t length)
+{
+  static int bus_reset_count, short_packet_count, phy_packet_count;
+  static int tcode_count[16];
+  static struct timeval last_update;
+  struct timeval now;
+  int i;
+
+  if (length == 0)
+    bus_reset_count++;
+  else if (length < sizeof(struct phy_packet))
+    short_packet_count++;
+  else if (length == sizeof(struct phy_packet) && data[1] == ~data[2])
+    phy_packet_count++;
+  else {
+    struct link_packet *packet = (struct link_packet *) data;
+    tcode_count[packet->common.tcode]++;
+  }
+
+  gettimeofday(&now, NULL);
+  if (now.tv_sec <= last_update.tv_sec &&
+      now.tv_usec < last_update.tv_usec + 500000)
+    return;
+  
+  last_update = now;
+  printf(CLEAR HIDE_CURSOR
+	 "  bus resets              : %8d\n"
+	 "  short packets           : %8d\n"
+	 "  phy packets             : %8d\n",
+	 bus_reset_count, short_packet_count, phy_packet_count);
+
+  for (i = 0; i < array_length(packet_info); i++)
+    if (packet_info[i].type != PACKET_RESERVED)
+      printf("  %-24s: %8d\n", packet_info[i].name, tcode_count[i]);
+  printf(SHOW_CURSOR "\n");
+}
+
+struct termios saved_attributes;
+
+void
+reset_input_mode (void)
+{
+  tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes);
+}
+
+void
+set_input_mode (void)
+{
+  struct termios tattr;
+
+  /* Make sure stdin is a terminal. */
+  if (!isatty(STDIN_FILENO)) {
+    fprintf(stderr, "Not a terminal.\n");
+    exit(EXIT_FAILURE);
+  }
+
+  /* Save the terminal attributes so we can restore them later. */
+  tcgetattr(STDIN_FILENO, &saved_attributes);
+  atexit(reset_input_mode);
+
+  /* Set the funny terminal modes. */
+  tcgetattr(STDIN_FILENO, &tattr);
+  tattr.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO. */
+  tattr.c_cc[VMIN] = 1;
+  tattr.c_cc[VTIME] = 0;
+  tcsetattr(STDIN_FILENO, TCSAFLUSH, &tattr);
+}
+
+int main(int argc, const char *argv[])
+{
+  int fd = -1;
+  FILE *output = NULL, *input = NULL;
+  poptContext con;
+  int retval;
+  int view;
+  char c;
+  struct pollfd pollfds[2];
+
+  sys_sigint_handler = signal(SIGINT, sigint_handler);
+
+  con = poptGetContext(NULL, argc, argv, options, 0);
+  retval = poptGetNextOpt(con);
+  if (retval < -1) {
+    poptPrintUsage(con, stdout, 0);
+    return -1;
+  }
+
+  if (option_version) {
+    printf("dump tool for nosy sniffer, version %s\n", VERSION);
+    return 0;
+  }
+
+  if (__BYTE_ORDER != __LITTLE_ENDIAN)
+    fprintf(stderr, "warning: nosy has only been tested on little "
+	    "endian machines\n");
+
+  if (option_input != NULL) {
+    input = fopen(option_input, "r");
+    if (input == NULL) {
+      fprintf(stderr, "Could not open %s, %m\n", option_input);
+      return -1;
+    }
+  }
+  else {
+    fd = open(option_nosy_device, O_RDWR);
+    if (fd < 0) {
+      fprintf(stderr, "Could not open %s, %m\n", option_nosy_device);
+      return -1;
+    }
+    set_input_mode();
+  }
+
+  if (strcmp(option_view, "transaction") == 0)
+    view = VIEW_TRANSACTION;
+  else if (strcmp(option_view, "stats") == 0)
+    view = VIEW_STATS;
+  else
+    view = VIEW_PACKET;
+
+  if (option_output) {
+    output = fopen(option_output, "w");
+    if (output == NULL) {
+      fprintf(stderr, "Could not open %s, %m\n", option_output);
+      return -1;
+    }
+  }
+
+  setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
+
+  if (1) {
+    unsigned long buf[128 * 1024];
+    unsigned int filter;
+    int length;
+
+    filter = ~0;
+    if (!option_iso)
+      filter &= ~(1 <<TCODE_ISO_DATA);
+    if (!option_cycle_start)
+      filter &= ~(1 << TCODE_CYCLE_START);
+
+    if (view == VIEW_STATS)
+      ioctl(fd, NOSY_IOC_FILTER, ~(1 << TCODE_CYCLE_START));
+    else
+      ioctl(fd, NOSY_IOC_FILTER, filter);
+
+    ioctl(fd, NOSY_IOC_START);
+
+    pollfds[0].fd = fd;
+    pollfds[0].events = POLLIN;
+    pollfds[1].fd = STDIN_FILENO;
+    pollfds[1].events = POLLIN;
+
+    while (run) {
+      if (input != NULL) {
+	if (fread(&length, sizeof length, 1, input) != 1)
+	  return 0;
+	fread(buf, 1, length, input);
+      }
+      else {
+	poll(pollfds, 2, -1);
+	if (pollfds[1].revents) {
+	  read(STDIN_FILENO, &c, sizeof c);
+	  switch (c) {
+	  case 'q':
+	    if (output != NULL)
+	      fclose(output);
+	    return 0;
+	  }
+	}
+
+	if (pollfds[0].revents)
+	  length = read(fd, buf, sizeof buf);
+	else
+	  continue;
+      }
+
+      if (output != NULL) {
+	fwrite(&length, sizeof length, 1, output);
+	fwrite(buf, 1, length, output);
+      }
+
+      switch (view) {
+      case VIEW_TRANSACTION:
+	handle_packet(buf, length);
+	break;
+      case VIEW_PACKET:
+	print_packet(buf, length);
+	break;
+      case VIEW_STATS:
+	print_stats(buf, length);
+	break;
+      }
+    }
+  }
+  else
+    poptPrintUsage(con, stdout, 0);
+
+  if (output != NULL)
+    fclose(output);
+
+  close(fd);
+
+  poptFreeContext(con);
+
+  return 0;
+}