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promlib.c revision 1.1.78.1 
      1 /*	$NetBSD: promlib.c,v 1.1.78.1 2008/05/18 12:32:51 yamt 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