// SPDX-License-Identifier: GPL-2.0-or-later

  /*
   * nosy-dump - Interface to snoop mode driver for TI PCILynx 1394 controllers
   * Copyright (C) 2002-2006 Kristian Høgsberg

   */

  #include <byteswap.h>
  #include <endian.h>
  #include <fcntl.h>

  #include <linux/firewire-constants.h>

  #include <poll.h>
  #include <popt.h>
  #include <signal.h>

  #include <stdio.h>

  #include <stdlib.h>

  #include <string.h>

  #include <sys/ioctl.h>
  #include <sys/time.h>

  #include <termios.h>

  #include <unistd.h>

  
  #include "list.h"

  #include "nosy-dump.h"

  #include "nosy-user.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(uint32_t *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;
  static char *option_input;
  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

  };

  /* Allow all ^C except the first to interrupt the program in the usual way. */

  static void

  sigint_handler(int signal_num)
  {

  	if (run == 1) {
  		run = 0;
  		signal(SIGINT, SIG_DFL);
  	}

  }

  static struct subaction *

  subaction_create(uint32_t *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);

  	if (!sa)
  		exit(EXIT_FAILURE);

  	sa->ack = data[length / 4 - 1];
  	sa->length = length;
  	memcpy(&sa->packet, data, length);

  	return sa;

  }

  static void

  subaction_destroy(struct subaction *sa)
  {

  	free(sa);

  }

  static struct list pending_transaction_list = {

  	&pending_transaction_list, &pending_transaction_list
  };

  static 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);

  	if (!t)
  		exit(EXIT_FAILURE);

  	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;

  }

  static void

  link_transaction_destroy(struct link_transaction *t)
  {

  	struct subaction *sa;
  
  	while (!list_empty(&t->request_list)) {
  		sa = list_head(&t->request_list, struct subaction, link);
  		list_remove(&sa->link);
  		subaction_destroy(sa);
  	}
  	while (!list_empty(&t->response_list)) {
  		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 const struct protocol_decoder protocol_decoders[] = {

  	{ "FCP", decode_fcp }

  };

  static void

  handle_transaction(struct link_transaction *t)
  {

  	struct subaction *sa;
  	int i;
  
  	if (!t->request) {
  		printf("BUG in handle_transaction
  ");
  		return;
  	}
  
  	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((uint32_t *) &sa->packet, sa->length);
  		list_for_each_entry(sa, &t->response_list, link)
  			print_packet((uint32_t *) &sa->packet, sa->length);
  	}
  	printf("\r
  ");
  
  	link_transaction_destroy(t);

  }

  static 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[] = {

  	[0x0] = "write_quadlet_request",	[0x6] = "read_quadlet_response",
  	[0x1] = "write_block_request",		[0x7] = "read_block_response",
  	[0x2] = "write_response",		[0x8] = "cycle_start",
  	[0x3] = "reserved",			[0x9] = "lock_request",
  	[0x4] = "read_quadlet_request",		[0xa] = "iso_data",
  	[0x5] = "read_block_request",		[0xb] = "lock_response",

  };
  
  static const char * const ack_names[] = {

  	[0x0] = "no ack",			[0x8] = "reserved (0x08)",
  	[0x1] = "ack_complete",			[0x9] = "reserved (0x09)",
  	[0x2] = "ack_pending",			[0xa] = "reserved (0x0a)",
  	[0x3] = "reserved (0x03)",		[0xb] = "reserved (0x0b)",
  	[0x4] = "ack_busy_x",			[0xc] = "reserved (0x0c)",
  	[0x5] = "ack_busy_a",			[0xd] = "ack_data_error",
  	[0x6] = "ack_busy_b",			[0xe] = "ack_type_error",
  	[0x7] = "reserved (0x07)",		[0xf] = "reserved (0x0f)",

  };
  
  static const char * const rcode_names[] = {

  	[0x0] = "complete",			[0x4] = "conflict_error",
  	[0x1] = "reserved (0x01)",		[0x5] = "data_error",
  	[0x2] = "reserved (0x02)",		[0x6] = "type_error",
  	[0x3] = "reserved (0x03)",		[0x7] = "address_error",

  };
  
  static const char * const retry_names[] = {

  	[0x0] = "retry_1",
  	[0x1] = "retry_x",
  	[0x2] = "retry_a",
  	[0x3] = "retry_b",

  };
  
  enum {

  	PACKET_RESERVED,
  	PACKET_REQUEST,
  	PACKET_RESPONSE,
  	PACKET_OTHER,

  };
  
  struct packet_info {

  	const char *name;
  	int type;
  	int response_tcode;

  	const 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 }

  static const struct packet_field read_quadlet_request_fields[] = {

  	COMMON_REQUEST_FIELDS,
  	{ "crc", 96, 32, PACKET_FIELD_DETAIL },
  	{ "ack", 156, 4, 0, ack_names },

  };

  static const 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 },

  };

  static const 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 },

  };

  static const 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 },

  };

  static const struct packet_field write_quadlet_request_fields[] = {

  	COMMON_REQUEST_FIELDS,
  	{ "data", 96, 32, PACKET_FIELD_TRANSACTION },
  	{ "ack", -4, 4, 0, ack_names },

  };

  static const 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 },

  };

  static const struct packet_field write_response_fields[] = {

  	COMMON_RESPONSE_FIELDS,
  	{ "reserved", 64, 32, PACKET_FIELD_DETAIL },
  	{ "ack", -4, 4, 0, ack_names },

  };

  static const 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 const 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)
  	},

  };

  static int

  handle_request_packet(uint32_t *data, size_t length)
  {
  	struct link_packet *p = (struct link_packet *) data;
  	struct subaction *sa, *prev;
  	struct link_transaction *t;
  
  	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_REQUEST &&
  		    p->common.tcode != TCODE_WRITE_BLOCK_REQUEST)

  			/* 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;
  	}
  
  	return 1;
  }
  
  static int
  handle_response_packet(uint32_t *data, size_t length)
  {
  	struct link_packet *p = (struct link_packet *) data;
  	struct subaction *sa, *prev;
  	struct link_transaction *t;
  
  	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;
  	}
  
  	return 1;
  }
  
  static int

  handle_packet(uint32_t *data, size_t length)

  {

  	if (length == 0) {
  		printf("bus reset\r
  ");
  		clear_pending_transaction_list();
  	} else if (length > sizeof(struct phy_packet)) {
  		struct link_packet *p = (struct link_packet *) data;

  
  		switch (packet_info[p->common.tcode].type) {
  		case PACKET_REQUEST:

  			return handle_request_packet(data, length);

  
  		case PACKET_RESPONSE:

  			return handle_response_packet(data, length);

  
  		case PACKET_OTHER:
  		case PACKET_RESERVED:
  			return 0;
  		}

  	}

  
  	return 1;

  }

  static unsigned int
  get_bits(struct link_packet *packet, int offset, int width)

  {

  	uint32_t *data = (uint32_t *) packet;
  	uint32_t 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

  static 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)
  {

  	const struct packet_info *pi;

  	int data_length = 0;
  	int i;
  
  	pi = &packet_info[packet->common.tcode];
  
  	for (i = 0; i < pi->field_count; i++) {

  		const 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) {
  			uint32_t 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(uint32_t *data, size_t length)

  {

  	int i;
  
  	printf("%6u  ", 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%08x", 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%08x", 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
  ");

  }
  
  #define HIDE_CURSOR	"\033[?25l"
  #define SHOW_CURSOR	"\033[?25h"
  #define CLEAR		"\033[H\033[2J"
  
  static void

  print_stats(uint32_t *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
  "
  	       "  short packets           : %8d
  "
  	       "  phy packets             : %8d
  ",
  	       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
  ", packet_info[i].name, tcode_count[i]);
  	printf(SHOW_CURSOR "
  ");

  }

  static struct termios saved_attributes;

  static void

  reset_input_mode(void)

  {

  	tcsetattr(STDIN_FILENO, TCSANOW, &saved_attributes);

  }

  static void

  set_input_mode(void)

  {

  	struct termios tattr;
  
  	/* Make sure stdin is a terminal. */
  	if (!isatty(STDIN_FILENO)) {
  		fprintf(stderr, "Not a terminal.
  ");
  		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[])
  {

  	uint32_t buf[128 * 1024];
  	uint32_t filter;
  	int length, retval, view;

  	int fd = -1;
  	FILE *output = NULL, *input = NULL;
  	poptContext con;

  	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
  ", VERSION);
  		return 0;

  	}

  	if (__BYTE_ORDER != __LITTLE_ENDIAN)
  		fprintf(stderr, "warning: nosy has only been tested on little "
  			"endian machines
  ");
  
  	if (option_input != NULL) {
  		input = fopen(option_input, "r");
  		if (input == NULL) {
  			fprintf(stderr, "Could not open %s, %m
  ", option_input);
  			return -1;
  		}
  	} else {
  		fd = open(option_nosy_device, O_RDWR);
  		if (fd < 0) {
  			fprintf(stderr, "Could not open %s, %m
  ", 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
  ", option_output);
  			return -1;
  		}
  	}
  
  	setvbuf(stdout, NULL, _IOLBF, BUFSIZ);

  	filter = ~0;
  	if (!option_iso)
  		filter &= ~(1 << TCODE_STREAM_DATA);
  	if (!option_cycle_start)
  		filter &= ~(1 << TCODE_CYCLE_START);
  	if (view == VIEW_STATS)
  		filter = ~(1 << TCODE_CYCLE_START);

  	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;

  		}

  	}
  
  	if (output != NULL)
  		fclose(output);
  
  	close(fd);
  
  	poptFreeContext(con);
  
  	return 0;

  }