166 lines
3.3 KiB
C
166 lines
3.3 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: prom.c,v 1.3 1997/09/06 14:03:58 drochner Exp $ */
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/*
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* Mach Operating System
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* Copyright (c) 1992 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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#include <sys/types.h>
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#include <machine/prom.h>
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#include <machine/rpb.h>
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#include "common.h"
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#include "bootstrap.h"
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int console;
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static void prom_probe(struct console *cp);
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static int prom_init(int);
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void prom_putchar(int);
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int prom_getchar(void);
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int prom_poll(void);
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struct console promconsole = {
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"prom",
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"SRM firmware console",
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0,
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prom_probe,
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prom_init,
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prom_putchar,
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prom_getchar,
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prom_poll,
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};
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void
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init_prom_calls()
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{
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extern struct prom_vec prom_dispatch_v;
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struct rpb *r;
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struct crb *c;
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char buf[4];
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r = (struct rpb *)HWRPB_ADDR;
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c = (struct crb *)((u_int8_t *)r + r->rpb_crb_off);
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prom_dispatch_v.routine_arg = c->crb_v_dispatch;
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prom_dispatch_v.routine = c->crb_v_dispatch->entry_va;
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/* Look for console tty. */
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prom_getenv(PROM_E_TTY_DEV, buf, 4);
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console = buf[0] - '0';
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}
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static void
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prom_probe(struct console *cp)
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{
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init_prom_calls();
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cp->c_flags |= C_PRESENTIN|C_PRESENTOUT;
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}
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static int
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prom_init(int arg)
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{
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return 0;
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}
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void
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prom_putchar(int c)
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{
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prom_return_t ret;
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char cbuf;
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cbuf = c;
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do {
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ret.bits = prom_dispatch(PROM_R_PUTS, console, &cbuf, 1);
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} while ((ret.u.retval & 1) == 0);
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}
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static int saved_char = -1;
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int
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prom_getchar()
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{
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prom_return_t ret;
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if (saved_char != -1) {
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int c = saved_char;
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saved_char = -1;
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return c;
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}
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for (;;) {
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ret.bits = prom_dispatch(PROM_R_GETC, console);
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if (ret.u.status == 0 || ret.u.status == 1)
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return (ret.u.retval);
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}
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}
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int
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prom_poll()
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{
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prom_return_t ret;
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if (saved_char != -1)
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return 1;
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ret.bits = prom_dispatch(PROM_R_GETC, console);
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if (ret.u.status == 0 || ret.u.status == 1) {
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saved_char = ret.u.retval;
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return 1;
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}
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return 0;
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}
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int
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prom_getenv(id, buf, len)
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int id, len;
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char *buf;
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{
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prom_return_t ret;
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ret.bits = prom_dispatch(PROM_R_GETENV, id, buf, len-1);
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if (ret.u.status & 0x4)
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ret.u.retval = 0;
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buf[ret.u.retval] = '\0';
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return (ret.u.retval);
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}
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int
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prom_open(dev, len)
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char *dev;
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int len;
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{
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prom_return_t ret;
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ret.bits = prom_dispatch(PROM_R_OPEN, dev, len);
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if (ret.u.status & 0x4)
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return (-1);
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else
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return (ret.u.retval);
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}
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