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      1 /*	$NetBSD: promlib.c,v 1.3 2011/05/21 15:50:42 tsutsui 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 <lib/libsa/stand.h>
     41 #include <lib/libkern/libkern.h>
     42 
     43 #include "openfirm.h"
     44 
     45 
     46 void *romp;
     47 struct promops	promops;
     48 
     49 
     50 static void
     51 openfirmware_fatal(void)
     52 {
     53 	printf("Invalid Openfirmware environment\n");
     54 	exit(0);
     55 }
     56 
     57 static int
     58 openfirmware_chosen(void)
     59 {
     60 	static int phandle = -1;
     61 
     62 	if (phandle == -1) {
     63 		if ( (phandle = OF_finddevice("/chosen")) == -1) {
     64 			exit(0);
     65 		}
     66 	}
     67 
     68 	return (phandle);
     69 }
     70 
     71 static const char*
     72 openfirmware_bootpath(void)
     73 {
     74 	static char bootpath[PROM_MAX_PATH];
     75 
     76 	if (_prom_getprop(openfirmware_chosen(), "bootpath", bootpath,
     77 				sizeof(bootpath)) < 0) {
     78 		openfirmware_fatal();
     79 	}
     80 
     81 	return bootpath;
     82 }
     83 
     84 static const char*
     85 openfirmware_bootfile(void)
     86 {
     87 	/* Default image name */
     88 	return "netbsd";
     89 }
     90 
     91 static const char*
     92 openfirmware_bootargs(void)
     93 {
     94 	static char bootargs[PROM_MAX_PATH * 2];
     95 
     96 	if (_prom_getprop(openfirmware_chosen(), "bootargs", bootargs,
     97 				sizeof(bootargs)) < 0) {
     98 		openfirmware_fatal();
     99 	}
    100 
    101 	return bootargs;
    102 }
    103 
    104 static int
    105 openfirmware_getchar(void)
    106 {
    107 	unsigned char ch = '\0';
    108 	int l;
    109 
    110 	while ((l = OF_read(prom_stdin(), &ch, 1)) != 1)
    111 		if (l != -2 && l != 0)
    112 			return -1;
    113 	return ch;
    114 }
    115 
    116 static void
    117 openfirmware_putchar(int c)
    118 {
    119 	char ch = c;
    120 
    121 	if (c == '\n')
    122 		putchar('\r');
    123 	OF_write(prom_stdout(), &ch, 1);
    124 }
    125 
    126 void
    127 prom_halt(void)
    128 {
    129 	_prom_halt();
    130 }
    131 
    132 int
    133 prom_findroot(void)
    134 {
    135 	return OF_peer(0);
    136 }
    137 
    138 void
    139 prom_init(void)
    140 {
    141 	int phandle, size;
    142 
    143 	OF_initialize();
    144 
    145 	memset(&promops, 0, sizeof(promops));
    146 
    147 	/* Access to boot arguments */
    148 	promops.po_bootpath = openfirmware_bootpath;
    149 	promops.po_bootfile = openfirmware_bootfile;
    150 	promops.po_bootargs = openfirmware_bootargs;
    151 
    152 	/* I/O functions */
    153 	promops.po_getchar = openfirmware_getchar;
    154 	promops.po_putchar = openfirmware_putchar;
    155 	promops.po_open  = OF_open;
    156 	promops.po_close = OF_close;
    157 	promops.po_read  = OF_read;
    158 	promops.po_write = OF_write;
    159 	promops.po_seek  = OF_seek;
    160 
    161 	promops.po_instance_to_package = OF_instance_to_package;
    162 
    163 	/* Program termination control */
    164 	promops.po_halt  = OF_exit;
    165 	promops.po_abort = OF_enter;
    166 	promops.po_ticks = OF_milliseconds;
    167 
    168 	/* Device node traversal */
    169 	promops.po_firstchild  = OF_child;
    170 	promops.po_nextsibling = OF_peer;
    171 
    172 	/* Device node properties */
    173 	promops.po_getprop = OF_getprop;
    174 
    175 	/* Device discovery */
    176 	promops.po_finddevice = OF_finddevice;
    177 
    178 	/* Console I/O */
    179 	phandle = openfirmware_chosen();
    180 	size = _prom_getprop(phandle, "stdin", &promops.po_stdin,
    181 			sizeof(promops.po_stdin));
    182 	size += _prom_getprop(phandle, "stdout", &promops.po_stdout,
    183 			sizeof(promops.po_stdout));
    184 	if (size != (sizeof(promops.po_stdin) + sizeof(promops.po_stdout))) {
    185 		prom_halt();
    186 	}
    187 }
    188