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/types.h> 30 31 #include "bootstrap.h" 32 #include "openfirm.h" 33 34 static void ofw_cons_probe(struct console *cp); 35 static int ofw_cons_init(int); 36 void ofw_cons_putchar(int); 37 int ofw_cons_getchar(void); 38 int ofw_cons_poll(void); 39 40 static ihandle_t stdin; 41 static ihandle_t stdout; 42 43 struct console ofwconsole = { 44 "ofw", 45 "Open Firmware console", 46 0, 47 ofw_cons_probe, 48 ofw_cons_init, 49 ofw_cons_putchar, 50 ofw_cons_getchar, 51 ofw_cons_poll, 52 }; 53 54 static void 55 ofw_cons_probe(struct console *cp) 56 { 57 58 OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)); 59 OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)); 60 cp->c_flags |= C_PRESENTIN|C_PRESENTOUT; 61 } 62 63 static int 64 ofw_cons_init(int arg) 65 { 66 return 0; 67 } 68 69 void 70 ofw_cons_putchar(int c) 71 { 72 char cbuf; 73 74 if (c == '\n') { 75 cbuf = '\r'; 76 OF_write(stdout, &cbuf, 1); 77 } 78 79 cbuf = c; 80 OF_write(stdout, &cbuf, 1); 81 } 82 83 static int saved_char = -1; 84 85 int 86 ofw_cons_getchar() 87 { 88 unsigned char ch = '\0'; 89 int l; 90 91 if (saved_char != -1) { 92 l = saved_char; 93 saved_char = -1; 94 return l; 95 } 96 97 /* At least since version 4.0.0, QEMU became bug-compatible 98 * with PowerVM's vty, by inserting a \0 after every \r. 99 * As this confuses loader's interpreter and as a \0 coming 100 * from the console doesn't seem reasonable, it's filtered here. */ 101 if (OF_read(stdin, &ch, 1) > 0 && ch != '\0') 102 return (ch); 103 104 return (-1); 105 } 106 107 int 108 ofw_cons_poll() 109 { 110 unsigned char ch; 111 112 if (saved_char != -1) 113 return 1; 114 115 if (OF_read(stdin, &ch, 1) > 0) { 116 saved_char = ch; 117 return 1; 118 } 119 120 return 0; 121 } 122