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Annotation of researchv9/jerq/src/mux/proto/proto.h, revision 1.1

1.1     ! root        1: #ifdef XT
        !             2: #ifndef        MAXPCHAN
        !             3: #include       "sys/xtproto.h"
        !             4: #endif
        !             5: #else  XT
        !             6: /*
        !             7: **     Mpx -- Blit packet protocol definition
        !             8: */
        !             9: 
        !            10: typedef        unsigned char   Pbyte;                  /* The unit of communication */
        !            11: 
        !            12: /*
        !            13: **     Packet header
        !            14: **     (if only bit fields in C were m/c independant, sigh...)
        !            15: */
        !            16: 
        !            17: #define        P_PTYPE         0x80                    /* always set */
        !            18: #define        P_CNTL          0x40                    /* TRUE if control packet */
        !            19: #define        MAXPCHAN        16                      /* Maximum channel number */
        !            20: #define        CBITS           4                       /* Bits for channel number */
        !            21: #define        SEQMOD          4                       /* Sequence number modulus */
        !            22: #define        SBITS           2                       /* Bits for sequence number */
        !            23: 
        !            24: /* was 64 */
        !            25: #define        MAXPKTDSIZE     (124 * sizeof(Pbyte))   /* Maximum data part size */
        !            26: #define        EDSIZE          (2 * sizeof(Pbyte))     /* Error detection part size */
        !            27: 
        !            28: #define P_channel(b)   (((b)>>SBITS) & (MAXPCHAN-1))
        !            29: #define P_seq(b)       ((b) & (SEQMOD-1))
        !            30: 
        !            31: /*
        !            32: **     Packet definition for maximum sized packet for transmission
        !            33: */
        !            34: 
        !            35: struct Packet
        !            36: {
        !            37:        Pbyte           header, dsize;          /* Header part */
        !            38:        Pbyte           data[MAXPKTDSIZE];      /* Data part */
        !            39:        Pbyte           edb[EDSIZE];            /* Error detection part */
        !            40: };
        !            41: 
        !            42: typedef struct Packet *        Pkt_p;
        !            43: 
        !            44: /*
        !            45: **     Control codes
        !            46: */
        !            47: 
        !            48: #define        ACK     (Pbyte)(006)    /* Last packet with same seq. ok and in seq. */
        !            49: #define        NAK     (Pbyte)(025)    /* Last packet with same seq. rec'd out of seq. */
        !            50: #define        PCDATA  (Pbyte)(002)    /* Data only control packet */
        !            51: #endif XT

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