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 #include <sys/types.h> 31 32 #include "bootstrap.h" 33 #include "openfirm.h" 34 35 static void ofw_cons_probe(struct console *cp); 36 static int ofw_cons_init(int); 37 void ofw_cons_putchar(int); 38 int ofw_cons_getchar(void); 39 int ofw_cons_poll(void); 40 41 static ihandle_t stdin; 42 static ihandle_t stdout; 43 44 struct console ofwconsole = { 45 "ofw", 46 "Open Firmware console", 47 0, 48 ofw_cons_probe, 49 ofw_cons_init, 50 ofw_cons_putchar, 51 ofw_cons_getchar, 52 ofw_cons_poll, 53 }; 54 55 static void 56 ofw_cons_probe(struct console *cp) 57 { 58 59 OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)); 60 OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)); 61 cp->c_flags |= C_PRESENTIN|C_PRESENTOUT; 62 } 63 64 static int 65 ofw_cons_init(int arg) 66 { 67 return 0; 68 } 69 70 void 71 ofw_cons_putchar(int c) 72 { 73 char cbuf; 74 75 if (c == '\n') { 76 cbuf = '\r'; 77 OF_write(stdout, &cbuf, 1); 78 } 79 80 cbuf = c; 81 OF_write(stdout, &cbuf, 1); 82 } 83 84 static int saved_char = -1; 85 86 int 87 ofw_cons_getchar() 88 { 89 unsigned char ch = '\0'; 90 int l; 91 92 if (saved_char != -1) { 93 l = saved_char; 94 saved_char = -1; 95 return l; 96 } 97 98 /* At least since version 4.0.0, QEMU became bug-compatible 99 * with PowerVM's vty, by inserting a \0 after every \r. 100 * As this confuses loader's interpreter and as a \0 coming 101 * from the console doesn't seem reasonable, it's filtered here. */ 102 if (OF_read(stdin, &ch, 1) > 0 && ch != '\0') 103 return (ch); 104 105 return (-1); 106 } 107 108 int 109 ofw_cons_poll() 110 { 111 unsigned char ch; 112 113 if (saved_char != -1) 114 return 1; 115 116 if (OF_read(stdin, &ch, 1) > 0) { 117 saved_char = ch; 118 return 1; 119 } 120 121 return 0; 122 } 123