cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ethernet/i825xx/sun3_82586.h

/*
 * Intel i82586 Ethernet definitions
 *
 * This is an extension to the Linux operating system, and is covered by the
 * same Gnu 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
 */

/*
 * Cloned from ni52.h, copyright as above.
 *
 * Modified for Sun3 OBIO i82586 by Sam Creasey (sammy@sammy.net)
 */


/* defines for the obio chip (not vme) */

#define IEOB_NORSET 0x80        
/* don't reset the board */

#define IEOB_ONAIR  0x40        
/* put us on the air */

#define IEOB_ATTEN  0x20        
/* attention! */

#define IEOB_IENAB  0x10        
/* interrupt enable */

#define IEOB_XXXXX  0x08        
/* free bit */

#define IEOB_XCVRL2 0x04        
/* level 2 transceiver? */

#define IEOB_BUSERR 0x02        
/* bus error */

#define IEOB_INT    0x01        
/* interrupt */

/* where the obio one lives */

#define IE_OBIO 0xc0000

#define IE_IRQ 3

/*
 * where to find the System Configuration Pointer (SCP)
 */

#define SCP_DEFAULT_ADDRESS 0xfffff4


/*
 * System Configuration Pointer Struct
 */


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


/*
 * Intermediate System Configuration Pointer (ISCP)
 */

struct iscp_struct
{
  
unsigned char  busy;          /* 586 clears after successful init */
  
unsigned char  zero_dummy;    /* has to be zero */
  
unsigned short scb_offset;    /* pointeroffset to the scb_base */
  
char          *scb_base;      /* base-address of all 16-bit offsets */
};

/*
 * System Control Block (SCB)
 */

struct scb_struct
{
  
unsigned char rus;
  
unsigned char cus;
  
unsigned char cmd_ruc;           /* command word: RU part */
  
unsigned char cmd_cuc;           /* command word: CU part & ACK */
  
unsigned short cbl_offset;    /* pointeroffset, command block list */
  
unsigned short rfa_offset;    /* pointeroffset, receive frame area */
  
unsigned short crc_errs;      /* CRC-Error counter */
  
unsigned short aln_errs;      /* allignmenterror counter */
  
unsigned short rsc_errs;      /* Resourceerror counter */
  
unsigned short 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
{
  
unsigned char  stat_low;	/* status word */
  
unsigned char  stat_high;	/* status word */
  
unsigned char  rfd_sf;	/* 82596 mode only */
  
unsigned char  last;		/* Bit15,Last Frame on List / Bit14,suspend */
  
unsigned short next;		/* linkoffset to next RFD */
  
unsigned short rbd_offset;	/* pointeroffset to RBD-buffer */
  
unsigned char  dest[ETH_ALEN];	/* ethernet-address, destination */
  
unsigned char  source[ETH_ALEN];	/* ethernet-address, source */
  
unsigned short length;	/* 802.3 frame-length */
  
unsigned short 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
{
  
unsigned short status;	/* status word,number of used bytes in buff */
  
unsigned short next;		/* pointeroffset to next RBD */
  
char          *buffer;	/* receive buffer address pointer */
  
unsigned short size;		/* size of this buffer */
  
unsigned short 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
{
  
unsigned short cmd_status;	/* status of this command */
  
unsigned short cmd_cmd;       /* the command itself (+bits) */
  
unsigned short cmd_link;      /* offsetpointer to next command */
};

/*
 * IA Setup command
 */

struct iasetup_cmd_struct
{
  
unsigned short cmd_status;
  
unsigned short cmd_cmd;
  
unsigned short cmd_link;
  
unsigned char  iaddr[6];
};

/*
 * Configure command
 */

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

/*
 * Multicast Setup command
 */

struct mcsetup_cmd_struct
{
  
unsigned short cmd_status;
  
unsigned short cmd_cmd;
  
unsigned short cmd_link;
  
unsigned short mc_cnt;		/* number of bytes in the MC-List */
  
unsigned char  mc_list[0][6];  	/* pointer to 6 bytes entries */
};

/*
 * DUMP command
 */

struct dump_cmd_struct
{
  
unsigned short cmd_status;
  
unsigned short cmd_cmd;
  
unsigned short cmd_link;
  
unsigned short dump_offset;    /* pointeroffset to DUMP space */
};

/*
 * transmit command
 */

struct transmit_cmd_struct
{
  
unsigned short cmd_status;
  
unsigned short cmd_cmd;
  
unsigned short cmd_link;
  
unsigned short tbd_offset;	/* pointeroffset to TBD */
  
unsigned char  dest[6];       /* destination address of the frame */
  
unsigned short 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
{
  
unsigned short cmd_status;
  
unsigned short cmd_cmd;
  
unsigned short cmd_link;
  
unsigned short 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
{
  
unsigned short size;		/* size + EOF-Flag(15) */
  
unsigned short next;          /* pointeroffset to next TBD */
  
char          *buffer;        /* pointer to buffer */
};


#define TBD_LAST 0x8000         
/* EOF-Flag, indicates last buffer in list */





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