1 /* $NetBSD: promlib.c,v 1.2 2008/04/28 20:23:36 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Paul Kranenburg. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * OPENPROM functions. These are here mainly to hide the OPENPROM interface 34 * from the rest of the kernel. 35 */ 36 37 #include <sys/types.h> 38 #include <machine/promlib.h> 39 40 #include "openfirm.h" 41 42 43 void *romp; 44 struct promops promops; 45 46 47 static void 48 openfirmware_fatal(void) 49 { 50 printf("Invalid Openfirmware environment\n"); 51 exit(0); 52 } 53 54 static int 55 openfirmware_chosen(void) 56 { 57 static int phandle = -1; 58 59 if (phandle == -1) { 60 if ( (phandle = OF_finddevice("/chosen")) == -1) { 61 exit(0); 62 } 63 } 64 65 return (phandle); 66 } 67 68 static const char* 69 openfirmware_bootpath(void) 70 { 71 static char bootpath[PROM_MAX_PATH]; 72 73 if (_prom_getprop(openfirmware_chosen(), "bootpath", bootpath, 74 sizeof(bootpath)) < 0) { 75 openfirmware_fatal(); 76 } 77 78 return bootpath; 79 } 80 81 static const char* 82 openfirmware_bootfile(void) 83 { 84 /* Default image name */ 85 return "netbsd"; 86 } 87 88 static const char* 89 openfirmware_bootargs(void) 90 { 91 static char bootargs[PROM_MAX_PATH * 2]; 92 93 if (_prom_getprop(openfirmware_chosen(), "bootargs", bootargs, 94 sizeof(bootargs)) < 0) { 95 openfirmware_fatal(); 96 } 97 98 return bootargs; 99 } 100 101 static int 102 openfirmware_getchar(void) 103 { 104 unsigned char ch = '\0'; 105 int l; 106 107 while ((l = OF_read(prom_stdin(), &ch, 1)) != 1) 108 if (l != -2 && l != 0) 109 return -1; 110 return ch; 111 } 112 113 static void 114 openfirmware_putchar(int c) 115 { 116 char ch = c; 117 118 if (c == '\n') 119 putchar('\r'); 120 OF_write(prom_stdout(), &ch, 1); 121 } 122 123 void 124 prom_halt(void) 125 { 126 _prom_halt(); 127 } 128 129 int 130 prom_findroot(void) 131 { 132 return OF_peer(0); 133 } 134 135 void 136 prom_init(void) 137 { 138 int phandle, size; 139 140 OF_initialize(); 141 142 memset(promops, 0, sizeof(promops)); 143 144 /* Access to boot arguments */ 145 promops.po_bootpath = openfirmware_bootpath; 146 promops.po_bootfile = openfirmware_bootfile; 147 promops.po_bootargs = openfirmware_bootargs; 148 149 /* I/O functions */ 150 promops.po_getchar = openfirmware_getchar; 151 promops.po_putchar = openfirmware_putchar; 152 promops.po_open = OF_open; 153 promops.po_close = OF_close; 154 promops.po_read = OF_read; 155 promops.po_write = OF_write; 156 promops.po_seek = OF_seek; 157 158 promops.po_instance_to_package = OF_instance_to_package; 159 160 /* Program termination control */ 161 promops.po_halt = OF_exit; 162 promops.po_abort = OF_enter; 163 promops.po_ticks = OF_milliseconds; 164 165 /* Device node traversal */ 166 promops.po_firstchild = OF_child; 167 promops.po_nextsibling = OF_peer; 168 169 /* Device node properties */ 170 promops.po_getprop = OF_getprop; 171 172 /* Device discovery */ 173 promops.po_finddevice = OF_finddevice; 174 175 /* Console I/O */ 176 phandle = openfirmware_chosen(); 177 size = _prom_getprop(phandle, "stdin", &promops.po_stdin, 178 sizeof(promops.po_stdin)); 179 size += _prom_getprop(phandle, "stdout", &promops.po_stdout, 180 sizeof(promops.po_stdout)); 181 if (size != (sizeof(promops.po_stdin) + sizeof(promops.po_stdout))) { 182 prom_halt(); 183 } 184 } 185