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