ofw_console.c revision 38465
1/* $Id$ */ 2/* $NetBSD: prom.c,v 1.3 1997/09/06 14:03:58 drochner 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/prom.h> 33#include <machine/rpb.h> 34 35#include "common.h" 36#include "bootstrap.h" 37 38int console; 39 40static void prom_probe(struct console *cp); 41static int prom_init(int); 42void prom_putchar(int); 43int prom_getchar(void); 44static int prom_poll(void); 45 46struct console promconsole = { 47 "prom", 48 "SRM firmware console", 49 0, 50 prom_probe, 51 prom_init, 52 prom_putchar, 53 prom_getchar, 54 prom_poll, 55}; 56 57void 58init_prom_calls() 59{ 60 extern struct prom_vec prom_dispatch_v; 61 struct rpb *r; 62 struct crb *c; 63 char buf[4]; 64 65 r = (struct rpb *)HWRPB_ADDR; 66 c = (struct crb *)((u_int8_t *)r + r->rpb_crb_off); 67 68 prom_dispatch_v.routine_arg = c->crb_v_dispatch; 69 prom_dispatch_v.routine = c->crb_v_dispatch->entry_va; 70 71 /* Look for console tty. */ 72 prom_getenv(PROM_E_TTY_DEV, buf, 4); 73 console = buf[0] - '0'; 74} 75 76static void 77prom_probe(struct console *cp) 78{ 79 init_prom_calls(); 80 cp->c_flags |= C_PRESENTIN|C_PRESENTOUT; 81} 82 83static int 84prom_init(int arg) 85{ 86 return 0; 87} 88 89void 90prom_putchar(int c) 91{ 92 prom_return_t ret; 93 char cbuf; 94 95 cbuf = c; 96 do { 97 ret.bits = prom_dispatch(PROM_R_PUTS, console, &cbuf, 1); 98 } while ((ret.u.retval & 1) == 0); 99} 100 101static int saved_char = -1; 102 103int 104prom_getchar() 105{ 106 prom_return_t ret; 107 108 if (saved_char != -1) { 109 int c = saved_char; 110 saved_char = -1; 111 return c; 112 } 113 114 for (;;) { 115 ret.bits = prom_dispatch(PROM_R_GETC, console); 116 if (ret.u.status == 0 || ret.u.status == 1) 117 return (ret.u.retval); 118 } 119} 120 121int 122prom_poll() 123{ 124 prom_return_t ret; 125 126 if (saved_char != -1) 127 return 1; 128 129 ret.bits = prom_dispatch(PROM_R_GETC, console); 130 if (ret.u.status == 0 || ret.u.status == 1) { 131 saved_char = ret.u.retval; 132 return 1; 133 } 134 135 return 0; 136} 137 138int 139prom_getenv(id, buf, len) 140 int id, len; 141 char *buf; 142{ 143 prom_return_t ret; 144 145 ret.bits = prom_dispatch(PROM_R_GETENV, id, buf, len-1); 146 if (ret.u.status & 0x4) 147 ret.u.retval = 0; 148 buf[ret.u.retval] = '\0'; 149 150 return (ret.u.retval); 151} 152 153int 154prom_open(dev, len) 155 char *dev; 156 int len; 157{ 158 prom_return_t ret; 159 160 ret.bits = prom_dispatch(PROM_R_OPEN, dev, len); 161 if (ret.u.status & 0x4) 162 return (-1); 163 else 164 return (ret.u.retval); 165} 166