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Annotation of sys/arch/alpha/stand/prom.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: prom.c,v 1.5 1997/01/24 19:58:07 niklas Exp $ */
                      2: /*     $NetBSD: prom.c,v 1.2 1996/11/25 16:18:16 cgd Exp $     */
                      3:
                      4: /*
                      5:  * Mach Operating System
                      6:  * Copyright (c) 1992 Carnegie Mellon University
                      7:  * All Rights Reserved.
                      8:  *
                      9:  * Permission to use, copy, modify and distribute this software and its
                     10:  * documentation is hereby granted, provided that both the copyright
                     11:  * notice and this permission notice appear in all copies of the
                     12:  * software, derivative works or modified versions, and any portions
                     13:  * thereof, and that both notices appear in supporting documentation.
                     14:  *
                     15:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     16:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     17:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     18:  *
                     19:  * Carnegie Mellon requests users of this software to return to
                     20:  *
                     21:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
                     22:  *  School of Computer Science
                     23:  *  Carnegie Mellon University
                     24:  *  Pittsburgh PA 15213-3890
                     25:  *
                     26:  * any improvements or extensions that they make and grant Carnegie Mellon
                     27:  * the rights to redistribute these changes.
                     28:  */
                     29:
                     30: #include <sys/types.h>
                     31:
                     32: #include <machine/rpb.h>
                     33: #include <machine/prom.h>
                     34:
                     35: int console;
                     36:
                     37: void
                     38: init_prom_calls()
                     39: {
                     40:        extern struct prom_vec prom_dispatch_v;
                     41:        struct rpb *r;
                     42:        struct crb *c;
                     43:        char buf[4];
                     44:
                     45:        r = (struct rpb *)HWRPB_ADDR;
                     46:        c = (struct crb *)((u_int8_t *)r + r->rpb_crb_off);
                     47:
                     48:        prom_dispatch_v.routine_arg = c->crb_v_dispatch;
                     49:        prom_dispatch_v.routine = c->crb_v_dispatch->entry_va;
                     50:
                     51:        /* Look for console tty. */
                     52:        prom_getenv(PROM_E_TTY_DEV, buf, 4);
                     53:        console = buf[0] - '0';
                     54: }
                     55:
                     56: int
                     57: getchar()
                     58: {
                     59:        prom_return_t ret;
                     60:
                     61:        for (;;) {
                     62:                ret.bits = prom_dispatch(PROM_R_GETC, console);
                     63:                if (ret.u.status == 0 || ret.u.status == 1)
                     64:                        return (ret.u.retval);
                     65:        }
                     66: }
                     67:
                     68: void
                     69: putchar(c)
                     70:        int c;
                     71: {
                     72:        prom_return_t ret;
                     73:        char cbuf;
                     74:
                     75:        if (c == '\r' || c == '\n') {
                     76:                cbuf = '\r';
                     77:                do {
                     78:                        ret.bits = prom_dispatch(PROM_R_PUTS, console,
                     79:                            &cbuf, 1);
                     80:                } while ((ret.u.retval & 1) == 0);
                     81:                cbuf = '\n';
                     82:        } else
                     83:                cbuf = c;
                     84:        do {
                     85:                ret.bits = prom_dispatch(PROM_R_PUTS, console, &cbuf, 1);
                     86:        } while ((ret.u.retval & 1) == 0);
                     87: }
                     88:
                     89: int
                     90: prom_getenv(id, buf, len)
                     91:        int id, len;
                     92:        char *buf;
                     93: {
                     94:        prom_return_t ret;
                     95:
                     96:        ret.bits = prom_dispatch(PROM_R_GETENV, id, buf, len-1);
                     97:        if (ret.u.status & 0x4)
                     98:                ret.u.retval = 0;
                     99:        buf[ret.u.retval] = '\0';
                    100:
                    101:        return (ret.u.retval);
                    102: }
                    103:
                    104: int
                    105: prom_open(dev, len)
                    106:        char *dev;
                    107:        int len;
                    108: {
                    109:        prom_return_t ret;
                    110:
                    111:        ret.bits = prom_dispatch(PROM_R_OPEN, dev, len);
                    112:        if (ret.u.status & 0x4)
                    113:                return (-1);
                    114:        else
                    115:                return (ret.u.retval);
                    116: }