usr/src/sys/tahoe/tahoe/cp.h

/*      cp.h    1.1     86/01/05        */
/*      Console Processor Interface     */
/*      Tahoe version, Nov. 1982        */

/****************************************/
/*                                      */
/*      Reduced DCB layout for byte     */
/*      communication.                  */
/*                                      */
/****************************************/

#define CPBUFLEN 200            /* Output buffer length */
#ifndef LOCORE
struct  cphdr
{
        char    cp_unit;        /* Done bit & unit # */
        char    cp_comm;        /* Command */
        short   cp_count;       /* Counter (when relevant) */
};

struct  cpdcb_o                 /* Output structure */
{
        struct  cphdr   cp_hdr;
        char    cp_buf[CPBUFLEN]; /* Buffer for output or 'stty' */
};

struct  cpdcb_i                 /* Structure for input */
{
        struct  cphdr   cp_hdr;
        char    cpi_buf[4];     /* Buffer for input */
};
#endif

#define CPDONE  0x80            /* 'Done' bit in cp_unit */
#define CPTAKE  0x40            /* CP 'ack' to this cpdcb */

                /* Values for 'unit' */
#define CPUNIT  0               /* The CP itself */
#define CPCONS  1               /* Console line */
#define CPREMOT 2               /* Remote line */

                /* Values for 'command' */
#define CPRESET 0
#define CPWRITE 1
#define CPREAD  2
#define CPSTTY  3
#define CPBOOT  4