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

/*
 *      @(#)cp.h        7.1 (Berkeley) 5/21/88
 */

/*
 * Tahoe console processor interface
 */

/*
 * 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 */

/* unit values */
#define CPUNIT  0               /* the CP itself */
#define CPCONS  1               /* console line */
#define CPREMOT 2               /* remote line */
#define CPCLOCK 4               /* realtime clock */

/* commands */
#define CPRESET 0
#define CPWRITE 1               /* write device or register */
#define CPREAD  2               /* read device or register */
#define CPSTTY  3               /* set terminal configuration */
#define CPBOOT  4               /* reboot system */

/*
 *      CP specific locations
 */
#define CPBFLG  0xc0000500      /* System bootflag flags */
#define CPYFLG  0xc0000504      /* Copy of the Y flag */
#define CPOPTS  0xc0000508      /* copy of CP options */
#define CPRSRV  0xc000050c      /* reserved for CP usage */
#define CPBDEV  0xc0000510      /* Bootstrap device, saved on boot */
#define CPEDEV  0xc000052f      /* End of device name */

#if !defined(LOCORE) && defined(KERNEL)
struct  cphdr *cnlast;          /* last command sent to cp */
#endif