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("$FreeBSD$"); 31 32 #include <sys/types.h> 33 34 #include "bootstrap.h" 35 #include "openfirm.h" 36 37 static void ofw_cons_probe(struct console *cp); 38 static int ofw_cons_init(int); 39 void ofw_cons_putchar(int); 40 int ofw_cons_getchar(void); 41 int ofw_cons_poll(void); 42 43 static ihandle_t stdin; 44 static ihandle_t stdout; 45 46 struct console ofwconsole = { 47 "ofw", 48 "Open Firmware console", 49 0, 50 ofw_cons_probe, 51 ofw_cons_init, 52 ofw_cons_putchar, 53 ofw_cons_getchar, 54 ofw_cons_poll, 55 }; 56 57 static void 58 ofw_cons_probe(struct console *cp) 59 { 60 61 OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)); 62 OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)); 63 cp->c_flags |= C_PRESENTIN|C_PRESENTOUT; 64 } 65 66 static int 67 ofw_cons_init(int arg) 68 { 69 return 0; 70 } 71 72 void 73 ofw_cons_putchar(int c) 74 { 75 char cbuf; 76 77 if (c == '\n') { 78 cbuf = '\r'; 79 OF_write(stdout, &cbuf, 1); 80 } 81 82 cbuf = c; 83 OF_write(stdout, &cbuf, 1); 84 } 85 86 static int saved_char = -1; 87 88 int 89 ofw_cons_getchar() 90 { 91 unsigned char ch = '\0'; 92 int l; 93 94 if (saved_char != -1) { 95 l = saved_char; 96 saved_char = -1; 97 return l; 98 } 99 100 /* At least since version 4.0.0, QEMU became bug-compatible 101 * with PowerVM's vty, by inserting a \0 after every \r. 102 * As this confuses loader's interpreter and as a \0 coming 103 * from the console doesn't seem reasonable, it's filtered here. */ 104 if (OF_read(stdin, &ch, 1) > 0 && ch != '\0') 105 return (ch); 106 107 return (-1); 108 } 109 110 int 111 ofw_cons_poll() 112 { 113 unsigned char ch; 114 115 if (saved_char != -1) 116 return 1; 117 118 if (OF_read(stdin, &ch, 1) > 0) { 119 saved_char = ch; 120 return 1; 121 } 122 123 return 0; 124 } 125