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885 decky 1 
/*
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 * Copyright (C) 2005 Martin Decky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include "ofw.h"
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#include "printf.h"
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ofw_entry ofw;
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phandle ofw_chosen;
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ihandle ofw_mmu;
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ihandle ofw_stdout;
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void init(void)
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{
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	ofw_chosen = ofw_find_device("/chosen");
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	if (ofw_chosen == -1)
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		halt();
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	if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
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		ofw_stdout = 0;
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	ofw_mmu = ofw_open("/mmu");
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	if (ofw_mmu == -1) {
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		puts("Unable to open /mmu node\n");
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		halt();
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	}
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}
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void halt(void)
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{
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	ofw_call("exit", 0, 0);
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}
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int ofw_call(const char *service, const int nargs, const int nret, ...)
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{
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	va_list list;
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	ofw_args_t args;
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	int i;
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	args.service = service;
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	args.nargs = nargs;
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	args.nret = nret;
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	va_start(list, nret);
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	for (i = 0; i < nargs; i++)
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		args.args[i] = va_arg(list, ofw_arg_t);
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	va_end(list);
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	for (i = 0; i < nret; i++)
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		args.args[i + nargs] = 0;
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	ofw(&args);
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	return args.args[nargs];
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}
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ihandle ofw_open(const char *name)
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{
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	return ofw_call("open", 1, 1, name);
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}
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void ofw_write(const char *str, const int len)
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{
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	if (ofw_stdout == 0)
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		return;
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	ofw_call("write", 3, 1, ofw_stdout, str, len);
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}
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phandle ofw_find_device(const char *name)
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{
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	return ofw_call("finddevice", 1, 1, name);
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}
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int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
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{
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	return ofw_call("getprop", 4, 1, device, name, buf, buflen);
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}
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void *ofw_translate(const void *virt)
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{
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	return (void *) ofw_call("call-method", 7, 1, "translate", ofw_mmu, virt, 0, 0, 0, 0);
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}
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int ofw_map(const void *phys, const void *virt, const int size, const int mode)
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{
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	return ofw_call("call-method", 6, 1, "map", ofw_mmu, mode, size, virt, phys);
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}