[net-next-2.6.git] / drivers / net / ni52.h

/*
 * Intel i82586 Ethernet definitions
 *
 * This is an extension to the Linux operating system, and is covered by the
 * same GNU General Public License that covers that work.
 *
 * copyrights (c) 1994 by Michael Hipp (hippm@informatik.uni-tuebingen.de)
 *
 * I have done a look in the following sources:
 *   crynwr-packet-driver by Russ Nelson
 *   Garret A. Wollman's i82586-driver for BSD
 */


#define NI52_RESET     0  /* writing to this address, resets the i82586 */
#define NI52_ATTENTION 1  /* channel attention, kick the 586 */
#define NI52_TENA      3  /* 2-5 possibly wrong, Xmit enable */
#define NI52_TDIS      2  /* Xmit disable */
#define NI52_INTENA    5  /* Interrupt enable */
#define NI52_INTDIS    4  /* Interrupt disable */
#define NI52_MAGIC1    6  /* dunno exact function */
#define NI52_MAGIC2    7  /* dunno exact function */

#define NI52_MAGICVAL1 0x00  /* magic-values for ni5210 card */
#define NI52_MAGICVAL2 0x55

/*
 * where to find the System Configuration Pointer (SCP)
 */
#define SCP_DEFAULT_ADDRESS 0xfffff4


/*
 * System Configuration Pointer Struct
 */

struct scp_struct
{
	u16 zero_dum0;	/* has to be zero */
	u8 sysbus;	/* 0=16Bit,1=8Bit */
	u8 zero_dum1;	/* has to be zero for 586 */
	u16 zero_dum2;
	u16 zero_dum3;
	u32 iscp;		/* pointer to the iscp-block */
};


/*
 * Intermediate System Configuration Pointer (ISCP)
 */
struct iscp_struct
{
	u8 busy;          /* 586 clears after successful init */
	u8 zero_dummy;    /* has to be zero */
	u16 scb_offset;    /* pointeroffset to the scb_base */
	u32 scb_base;      /* base-address of all 16-bit offsets */
};

/*
 * System Control Block (SCB)
 */
struct scb_struct
{
	u8 rus;
	u8 cus;
	u8 cmd_ruc;        /* command word: RU part */
	u8 cmd_cuc;        /* command word: CU part & ACK */
	u16 cbl_offset;    /* pointeroffset, command block list */
	u16 rfa_offset;    /* pointeroffset, receive frame area */
	u16 crc_errs;      /* CRC-Error counter */
	u16 aln_errs;      /* alignmenterror counter */
	u16 rsc_errs;      /* Resourceerror counter */
	u16 ovrn_errs;     /* OVerrunerror counter */
};

/*
 * possible command values for the command word
 */
#define RUC_MASK	0x0070	/* mask for RU commands */
#define RUC_NOP		0x0000	/* NOP-command */
#define RUC_START	0x0010	/* start RU */
#define RUC_RESUME	0x0020	/* resume RU after suspend */
#define RUC_SUSPEND	0x0030	/* suspend RU */
#define RUC_ABORT	0x0040	/* abort receiver operation immediately */

#define CUC_MASK        0x07  /* mask for CU command */
#define CUC_NOP         0x00  /* NOP-command */
#define CUC_START       0x01  /* start execution of 1. cmd on the CBL */
#define CUC_RESUME      0x02  /* resume after suspend */
#define CUC_SUSPEND     0x03  /* Suspend CU */
#define CUC_ABORT       0x04  /* abort command operation immediately */

#define ACK_MASK        0xf0  /* mask for ACK command */
#define ACK_CX          0x80  /* acknowledges STAT_CX */
#define ACK_FR          0x40  /* ack. STAT_FR */
#define ACK_CNA         0x20  /* ack. STAT_CNA */
#define ACK_RNR         0x10  /* ack. STAT_RNR */

/*
 * possible status values for the status word
 */
#define STAT_MASK       0xf0  /* mask for cause of interrupt */
#define STAT_CX         0x80  /* CU finished cmd with its I bit set */
#define STAT_FR         0x40  /* RU finished receiving a frame */
#define STAT_CNA        0x20  /* CU left active state */
#define STAT_RNR        0x10  /* RU left ready state */

#define CU_STATUS       0x7   /* CU status, 0=idle */
#define CU_SUSPEND      0x1   /* CU is suspended */
#define CU_ACTIVE       0x2   /* CU is active */

#define RU_STATUS	0x70	/* RU status, 0=idle */
#define RU_SUSPEND	0x10	/* RU suspended */
#define RU_NOSPACE	0x20	/* RU no resources */
#define RU_READY	0x40	/* RU is ready */

/*
 * Receive Frame Descriptor (RFD)
 */
struct rfd_struct
{
	u8  stat_low;	/* status word */
	u8  stat_high;	/* status word */
	u8  rfd_sf;	/* 82596 mode only */
	u8  last;		/* Bit15,Last Frame on List / Bit14,suspend */
	u16 next;		/* linkoffset to next RFD */
	u16 rbd_offset;	/* pointeroffset to RBD-buffer */
	u8  dest[6];	/* ethernet-address, destination */
	u8  source[6];	/* ethernet-address, source */
	u16 length;	/* 802.3 frame-length */
	u16 zero_dummy;	/* dummy */
};

#define RFD_LAST     0x80	/* last: last rfd in the list */
#define RFD_SUSP     0x40	/* last: suspend RU after  */
#define RFD_COMPL    0x80
#define RFD_OK       0x20
#define RFD_BUSY     0x40
#define RFD_ERR_LEN  0x10     /* Length error (if enabled length-checking */
#define RFD_ERR_CRC  0x08     /* CRC error */
#define RFD_ERR_ALGN 0x04     /* Alignment error */
#define RFD_ERR_RNR  0x02     /* status: receiver out of resources */
#define RFD_ERR_OVR  0x01     /* DMA Overrun! */

#define RFD_ERR_FTS  0x0080	/* Frame to short */
#define RFD_ERR_NEOP 0x0040	/* No EOP flag (for bitstuffing only) */
#define RFD_ERR_TRUN 0x0020	/* (82596 only/SF mode) indicates truncated frame */
#define RFD_MATCHADD 0x0002     /* status: Destinationaddress !matches IA (only 82596) */
#define RFD_COLLDET  0x0001	/* Detected collision during reception */

/*
 * Receive Buffer Descriptor (RBD)
 */
struct rbd_struct
{
	u16 status;	/* status word,number of used bytes in buff */
	u16 next;		/* pointeroffset to next RBD */
	u32 buffer;	/* receive buffer address pointer */
	u16 size;		/* size of this buffer */
	u16 zero_dummy;    /* dummy */
};

#define RBD_LAST	0x8000	/* last buffer */
#define RBD_USED	0x4000	/* this buffer has data */
#define RBD_MASK	0x3fff	/* size-mask for length */

/*
 * Statusvalues for Commands/RFD
 */
#define STAT_COMPL   0x8000	/* status: frame/command is complete */
#define STAT_BUSY    0x4000	/* status: frame/command is busy */
#define STAT_OK      0x2000	/* status: frame/command is ok */

/*
 * Action-Commands
 */
#define CMD_NOP		0x0000	/* NOP */
#define CMD_IASETUP	0x0001	/* initial address setup command */
#define CMD_CONFIGURE	0x0002	/* configure command */
#define CMD_MCSETUP	0x0003	/* MC setup command */
#define CMD_XMIT	0x0004	/* transmit command */
#define CMD_TDR		0x0005	/* time domain reflectometer (TDR) command */
#define CMD_DUMP	0x0006	/* dump command */
#define CMD_DIAGNOSE	0x0007	/* diagnose command */

/*
 * Action command bits
 */
#define CMD_LAST	0x8000	/* indicates last command in the CBL */
#define CMD_SUSPEND	0x4000	/* suspend CU after this CB */
#define CMD_INT		0x2000	/* generate interrupt after execution */

/*
 * NOP - command
 */
struct nop_cmd_struct
{
	u16 cmd_status;	/* status of this command */
	u16 cmd_cmd;       /* the command itself (+bits) */
	u16 cmd_link;      /* offsetpointer to next command */
};

/*
 * IA Setup command
 */
struct iasetup_cmd_struct
{
	u16 cmd_status;
	u16 cmd_cmd;
	u16 cmd_link;
	u8  iaddr[6];
};

/*
 * Configure command
 */
struct configure_cmd_struct
{
	u16 cmd_status;
	u16 cmd_cmd;
	u16 cmd_link;
	u8  byte_cnt;   /* size of the config-cmd */
	u8  fifo;       /* fifo/recv monitor */
	u8  sav_bf;     /* save bad frames (bit7=1)*/
	u8  adr_len;    /* adr_len(0-2),al_loc(3),pream(4-5),loopbak(6-7)*/
	u8  priority;   /* lin_prio(0-2),exp_prio(4-6),bof_metd(7) */
	u8  ifs;        /* inter frame spacing */
	u8  time_low;   /* slot time low */
	u8  time_high;  /* slot time high(0-2) and max. retries(4-7) */
	u8  promisc;    /* promisc-mode(0) , et al (1-7) */
	u8  carr_coll;  /* carrier(0-3)/collision(4-7) stuff */
	u8  fram_len;   /* minimal frame len */
	u8  dummy;	     /* dummy */
};

/*
 * Multicast Setup command
 */
struct mcsetup_cmd_struct
{
	u16 cmd_status;
	u16 cmd_cmd;
	u16 cmd_link;
	u16 mc_cnt;		/* number of bytes in the MC-List */
	u8  mc_list[0][6];  	/* pointer to 6 bytes entries */
};

/*
 * DUMP command
 */
struct dump_cmd_struct
{
	u16 cmd_status;
	u16 cmd_cmd;
	u16 cmd_link;
	u16 dump_offset;    /* pointeroffset to DUMP space */
};

/*
 * transmit command
 */
struct transmit_cmd_struct
{
	u16 cmd_status;
	u16 cmd_cmd;
	u16 cmd_link;
	u16 tbd_offset;	/* pointeroffset to TBD */
	u8  dest[6];       /* destination address of the frame */
	u16 length;	/* user defined: 802.3 length / Ether type */
};

#define TCMD_ERRMASK     0x0fa0
#define TCMD_MAXCOLLMASK 0x000f
#define TCMD_MAXCOLL     0x0020
#define TCMD_HEARTBEAT   0x0040
#define TCMD_DEFERRED    0x0080
#define TCMD_UNDERRUN    0x0100
#define TCMD_LOSTCTS     0x0200
#define TCMD_NOCARRIER   0x0400
#define TCMD_LATECOLL    0x0800

struct tdr_cmd_struct
{
	u16 cmd_status;
	u16 cmd_cmd;
	u16 cmd_link;
	u16 status;
};

#define TDR_LNK_OK	0x8000	/* No link problem identified */
#define TDR_XCVR_PRB	0x4000	/* indicates a transceiver problem */
#define TDR_ET_OPN	0x2000	/* open, no correct termination */
#define TDR_ET_SRT	0x1000	/* TDR detected a short circuit */
#define TDR_TIMEMASK	0x07ff	/* mask for the time field */

/*
 * Transmit Buffer Descriptor (TBD)
 */
struct tbd_struct
{
	u16 size;		/* size + EOF-Flag(15) */
	u16 next;          /* pointeroffset to next TBD */
	u32 buffer;        /* pointer to buffer */
};

#define TBD_LAST 0x8000         /* EOF-Flag, indicates last buffer in list */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Intel i82586 Ethernet definitions
	3	*
	4	* This is an extension to the Linux operating system, and is covered by the
	5	* same GNU General Public License that covers that work.
	6	*
	7	* copyrights (c) 1994 by Michael Hipp (hippm@informatik.uni-tuebingen.de)
	8	*
	9	* I have done a look in the following sources:
	10	* crynwr-packet-driver by Russ Nelson
	11	* Garret A. Wollman's i82586-driver for BSD
	12	*/
	13
6aa20a22	14
1da177e4 LT	15	#define NI52_RESET 0 /* writing to this address, resets the i82586 */
	16	#define NI52_ATTENTION 1 /* channel attention, kick the 586 */
	17	#define NI52_TENA 3 /* 2-5 possibly wrong, Xmit enable */
	18	#define NI52_TDIS 2 /* Xmit disable */
	19	#define NI52_INTENA 5 /* Interrupt enable */
	20	#define NI52_INTDIS 4 /* Interrupt disable */
	21	#define NI52_MAGIC1 6 /* dunno exact function */
	22	#define NI52_MAGIC2 7 /* dunno exact function */
	23
	24	#define NI52_MAGICVAL1 0x00 /* magic-values for ni5210 card */
	25	#define NI52_MAGICVAL2 0x55
	26
	27	/*
	28	* where to find the System Configuration Pointer (SCP)
	29	*/
	30	#define SCP_DEFAULT_ADDRESS 0xfffff4
	31
	32
	33	/*
	34	* System Configuration Pointer Struct
	35	*/
	36
	37	struct scp_struct
	38	{
a197f693 AC	39	u16 zero_dum0; /* has to be zero */
	40	u8 sysbus; /* 0=16Bit,1=8Bit */
	41	u8 zero_dum1; /* has to be zero for 586 */
725aa4a9 AV	42	u16 zero_dum2;
725aa4a9 AV	43	u16 zero_dum3;
a197f693	44	u32 iscp; /* pointer to the iscp-block */
1da177e4 LT	45	};
	46
	47
	48	/*
	49	* Intermediate System Configuration Pointer (ISCP)
	50	*/
	51	struct iscp_struct
	52	{
a197f693 AC	53	u8 busy; /* 586 clears after successful init */
	54	u8 zero_dummy; /* has to be zero */
	55	u16 scb_offset; /* pointeroffset to the scb_base */
	56	u32 scb_base; /* base-address of all 16-bit offsets */
1da177e4 LT	57	};
	58
	59	/*
	60	* System Control Block (SCB)
	61	*/
	62	struct scb_struct
	63	{
a197f693 AC	64	u8 rus;
	65	u8 cus;
	66	u8 cmd_ruc; /* command word: RU part */
	67	u8 cmd_cuc; /* command word: CU part & ACK */
	68	u16 cbl_offset; /* pointeroffset, command block list */
	69	u16 rfa_offset; /* pointeroffset, receive frame area */
	70	u16 crc_errs; /* CRC-Error counter */
	71	u16 aln_errs; /* alignmenterror counter */
	72	u16 rsc_errs; /* Resourceerror counter */
	73	u16 ovrn_errs; /* OVerrunerror counter */
1da177e4 LT	74	};
	75
	76	/*
	77	* possible command values for the command word
	78	*/
	79	#define RUC_MASK 0x0070 /* mask for RU commands */
	80	#define RUC_NOP 0x0000 /* NOP-command */
	81	#define RUC_START 0x0010 /* start RU */
	82	#define RUC_RESUME 0x0020 /* resume RU after suspend */
	83	#define RUC_SUSPEND 0x0030 /* suspend RU */
	84	#define RUC_ABORT 0x0040 /* abort receiver operation immediately */
	85
	86	#define CUC_MASK 0x07 /* mask for CU command */
	87	#define CUC_NOP 0x00 /* NOP-command */
	88	#define CUC_START 0x01 /* start execution of 1. cmd on the CBL */
	89	#define CUC_RESUME 0x02 /* resume after suspend */
	90	#define CUC_SUSPEND 0x03 /* Suspend CU */
	91	#define CUC_ABORT 0x04 /* abort command operation immediately */
	92
	93	#define ACK_MASK 0xf0 /* mask for ACK command */
	94	#define ACK_CX 0x80 /* acknowledges STAT_CX */
	95	#define ACK_FR 0x40 /* ack. STAT_FR */
	96	#define ACK_CNA 0x20 /* ack. STAT_CNA */
	97	#define ACK_RNR 0x10 /* ack. STAT_RNR */
	98
	99	/*
	100	* possible status values for the status word
	101	*/
	102	#define STAT_MASK 0xf0 /* mask for cause of interrupt */
	103	#define STAT_CX 0x80 /* CU finished cmd with its I bit set */
	104	#define STAT_FR 0x40 /* RU finished receiving a frame */
	105	#define STAT_CNA 0x20 /* CU left active state */
	106	#define STAT_RNR 0x10 /* RU left ready state */
	107
	108	#define CU_STATUS 0x7 /* CU status, 0=idle */
	109	#define CU_SUSPEND 0x1 /* CU is suspended */
	110	#define CU_ACTIVE 0x2 /* CU is active */
	111
	112	#define RU_STATUS 0x70 /* RU status, 0=idle */
	113	#define RU_SUSPEND 0x10 /* RU suspended */
	114	#define RU_NOSPACE 0x20 /* RU no resources */
	115	#define RU_READY 0x40 /* RU is ready */
	116
	117	/*
	118	* Receive Frame Descriptor (RFD)
	119	*/
	120	struct rfd_struct
	121	{
a197f693 AC	122	u8 stat_low; /* status word */
	123	u8 stat_high; /* status word */
	124	u8 rfd_sf; /* 82596 mode only */
	125	u8 last; /* Bit15,Last Frame on List / Bit14,suspend */
	126	u16 next; /* linkoffset to next RFD */
	127	u16 rbd_offset; /* pointeroffset to RBD-buffer */
	128	u8 dest[6]; /* ethernet-address, destination */
	129	u8 source[6]; /* ethernet-address, source */
	130	u16 length; /* 802.3 frame-length */
	131	u16 zero_dummy; /* dummy */
1da177e4 LT	132	};
	133
	134	#define RFD_LAST 0x80 /* last: last rfd in the list */
	135	#define RFD_SUSP 0x40 /* last: suspend RU after */
	136	#define RFD_COMPL 0x80
	137	#define RFD_OK 0x20
	138	#define RFD_BUSY 0x40
	139	#define RFD_ERR_LEN 0x10 /* Length error (if enabled length-checking */
	140	#define RFD_ERR_CRC 0x08 /* CRC error */
	141	#define RFD_ERR_ALGN 0x04 /* Alignment error */
	142	#define RFD_ERR_RNR 0x02 /* status: receiver out of resources */
	143	#define RFD_ERR_OVR 0x01 /* DMA Overrun! */
	144
	145	#define RFD_ERR_FTS 0x0080 /* Frame to short */
	146	#define RFD_ERR_NEOP 0x0040 /* No EOP flag (for bitstuffing only) */
	147	#define RFD_ERR_TRUN 0x0020 /* (82596 only/SF mode) indicates truncated frame */
	148	#define RFD_MATCHADD 0x0002 /* status: Destinationaddress !matches IA (only 82596) */
	149	#define RFD_COLLDET 0x0001 /* Detected collision during reception */
	150
	151	/*
	152	* Receive Buffer Descriptor (RBD)
	153	*/
6aa20a22	154	struct rbd_struct
1da177e4	155	{
a197f693 AC	156	u16 status; /* status word,number of used bytes in buff */
	157	u16 next; /* pointeroffset to next RBD */
	158	u32 buffer; /* receive buffer address pointer */
	159	u16 size; /* size of this buffer */
	160	u16 zero_dummy; /* dummy */
1da177e4 LT	161	};
	162
	163	#define RBD_LAST 0x8000 /* last buffer */
	164	#define RBD_USED 0x4000 /* this buffer has data */
	165	#define RBD_MASK 0x3fff /* size-mask for length */
	166
	167	/*
	168	* Statusvalues for Commands/RFD
	169	*/
	170	#define STAT_COMPL 0x8000 /* status: frame/command is complete */
	171	#define STAT_BUSY 0x4000 /* status: frame/command is busy */
	172	#define STAT_OK 0x2000 /* status: frame/command is ok */
	173
	174	/*
	175	* Action-Commands
	176	*/
	177	#define CMD_NOP 0x0000 /* NOP */
	178	#define CMD_IASETUP 0x0001 /* initial address setup command */
	179	#define CMD_CONFIGURE 0x0002 /* configure command */
	180	#define CMD_MCSETUP 0x0003 /* MC setup command */
	181	#define CMD_XMIT 0x0004 /* transmit command */
	182	#define CMD_TDR 0x0005 /* time domain reflectometer (TDR) command */
	183	#define CMD_DUMP 0x0006 /* dump command */
	184	#define CMD_DIAGNOSE 0x0007 /* diagnose command */
	185
	186	/*
	187	* Action command bits
	188	*/
	189	#define CMD_LAST 0x8000 /* indicates last command in the CBL */
	190	#define CMD_SUSPEND 0x4000 /* suspend CU after this CB */
	191	#define CMD_INT 0x2000 /* generate interrupt after execution */
	192
	193	/*
	194	* NOP - command
	195	*/
	196	struct nop_cmd_struct
	197	{
a197f693 AC	198	u16 cmd_status; /* status of this command */
	199	u16 cmd_cmd; /* the command itself (+bits) */
	200	u16 cmd_link; /* offsetpointer to next command */
1da177e4 LT	201	};
	202
	203	/*
	204	* IA Setup command
	205	*/
6aa20a22	206	struct iasetup_cmd_struct
1da177e4	207	{
a197f693 AC	208	u16 cmd_status;
	209	u16 cmd_cmd;
	210	u16 cmd_link;
	211	u8 iaddr[6];
1da177e4 LT	212	};
	213
	214	/*
6aa20a22	215	* Configure command
1da177e4 LT	216	*/
	217	struct configure_cmd_struct
	218	{
a197f693 AC	219	u16 cmd_status;
	220	u16 cmd_cmd;
	221	u16 cmd_link;
	222	u8 byte_cnt; /* size of the config-cmd */
	223	u8 fifo; /* fifo/recv monitor */
	224	u8 sav_bf; /* save bad frames (bit7=1)*/
	225	u8 adr_len; /* adr_len(0-2),al_loc(3),pream(4-5),loopbak(6-7)*/
	226	u8 priority; /* lin_prio(0-2),exp_prio(4-6),bof_metd(7) */
	227	u8 ifs; /* inter frame spacing */
	228	u8 time_low; /* slot time low */
	229	u8 time_high; /* slot time high(0-2) and max. retries(4-7) */
	230	u8 promisc; /* promisc-mode(0) , et al (1-7) */
	231	u8 carr_coll; /* carrier(0-3)/collision(4-7) stuff */
	232	u8 fram_len; /* minimal frame len */
	233	u8 dummy; /* dummy */
1da177e4 LT	234	};
	235
	236	/*
6aa20a22	237	* Multicast Setup command
1da177e4	238	*/
6aa20a22	239	struct mcsetup_cmd_struct
1da177e4	240	{
a197f693 AC	241	u16 cmd_status;
	242	u16 cmd_cmd;
	243	u16 cmd_link;
	244	u16 mc_cnt; /* number of bytes in the MC-List */
	245	u8 mc_list[0][6]; /* pointer to 6 bytes entries */
1da177e4 LT	246	};
	247
	248	/*
	249	* DUMP command
	250	*/
	251	struct dump_cmd_struct
	252	{
a197f693 AC	253	u16 cmd_status;
	254	u16 cmd_cmd;
	255	u16 cmd_link;
	256	u16 dump_offset; /* pointeroffset to DUMP space */
1da177e4 LT	257	};
	258
	259	/*
6aa20a22	260	* transmit command
1da177e4	261	*/
6aa20a22	262	struct transmit_cmd_struct
1da177e4	263	{
a197f693 AC	264	u16 cmd_status;
	265	u16 cmd_cmd;
	266	u16 cmd_link;
	267	u16 tbd_offset; /* pointeroffset to TBD */
	268	u8 dest[6]; /* destination address of the frame */
	269	u16 length; /* user defined: 802.3 length / Ether type */
1da177e4 LT	270	};
	271
	272	#define TCMD_ERRMASK 0x0fa0
	273	#define TCMD_MAXCOLLMASK 0x000f
	274	#define TCMD_MAXCOLL 0x0020
	275	#define TCMD_HEARTBEAT 0x0040
	276	#define TCMD_DEFERRED 0x0080
	277	#define TCMD_UNDERRUN 0x0100
	278	#define TCMD_LOSTCTS 0x0200
	279	#define TCMD_NOCARRIER 0x0400
	280	#define TCMD_LATECOLL 0x0800
	281
	282	struct tdr_cmd_struct
	283	{
a197f693 AC	284	u16 cmd_status;
	285	u16 cmd_cmd;
	286	u16 cmd_link;
	287	u16 status;
1da177e4 LT	288	};
	289
	290	#define TDR_LNK_OK 0x8000 /* No link problem identified */
	291	#define TDR_XCVR_PRB 0x4000 /* indicates a transceiver problem */
	292	#define TDR_ET_OPN 0x2000 /* open, no correct termination */
	293	#define TDR_ET_SRT 0x1000 /* TDR detected a short circuit */
	294	#define TDR_TIMEMASK 0x07ff /* mask for the time field */
	295
	296	/*
	297	* Transmit Buffer Descriptor (TBD)
	298	*/
	299	struct tbd_struct
	300	{
a197f693 AC	301	u16 size; /* size + EOF-Flag(15) */
	302	u16 next; /* pointeroffset to next TBD */
	303	u32 buffer; /* pointer to buffer */
1da177e4 LT	304	};
	305
	306	#define TBD_LAST 0x8000 /* EOF-Flag, indicates last buffer in list */
	307
	308
	309
	310