ofw_console.c revision 133862
1/* $NetBSD: prom.c,v 1.3 1997/09/06 14:03:58 drochner Exp $ */ 2 3/* 4 * Mach Operating System 5 * Copyright (c) 1992 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie Mellon 26 * the rights to redistribute these changes. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/sys/boot/ofw/libofw/ofw_console.c 133862 2004-08-16 15:45:27Z marius $"); 31 32#include <sys/types.h> 33 34#include "bootstrap.h" 35#include "openfirm.h" 36 37int console; 38 39static void ofw_cons_probe(struct console *cp); 40static int ofw_cons_init(int); 41void ofw_cons_putchar(int); 42int ofw_cons_getchar(void); 43int ofw_cons_poll(void); 44 45static ihandle_t stdin; 46static ihandle_t stdout; 47 48struct console ofwconsole = { 49 "ofw", 50 "Open Firmware console", 51 0, 52 ofw_cons_probe, 53 ofw_cons_init, 54 ofw_cons_putchar, 55 ofw_cons_getchar, 56 ofw_cons_poll, 57}; 58 59static void 60ofw_cons_probe(struct console *cp) 61{ 62 phandle_t chosen; 63 64 if ((chosen = OF_finddevice("/chosen")) == -1) 65 OF_exit(); 66 OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)); 67 OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)); 68 cp->c_flags |= C_PRESENTIN|C_PRESENTOUT; 69} 70 71static int 72ofw_cons_init(int arg) 73{ 74 return 0; 75} 76 77void 78ofw_cons_putchar(int c) 79{ 80 char cbuf; 81 82 if (c == '\n') { 83 cbuf = '\r'; 84 OF_write(stdout, &cbuf, 1); 85 } 86 87 cbuf = c; 88 OF_write(stdout, &cbuf, 1); 89} 90 91static int saved_char = -1; 92 93int 94ofw_cons_getchar() 95{ 96 unsigned char ch = '\0'; 97 int l; 98 99 if (saved_char != -1) { 100 l = saved_char; 101 saved_char = -1; 102 return l; 103 } 104 105 while ((l = OF_read(stdin, &ch, 1)) != 1) 106 if (l != -2 && l != 0) 107 return -1; 108 return ch; 109} 110 111int 112ofw_cons_poll() 113{ 114 unsigned char ch; 115 int l; 116 117 if (saved_char != -1) 118 return 1; 119 120 if (OF_read(stdin, &ch, 1) > 0) { 121 saved_char = ch; 122 return 1; 123 } 124 125 return 0; 126} 127