/*
 * Copyright (C) 2005 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include "ofw.h"
#include "printf.h"

ofw_entry ofw;

phandle ofw_chosen;
ihandle ofw_mmu;
ihandle ofw_stdout;


void init(void)
{
	ofw_chosen = ofw_find_device("/chosen");
	if (ofw_chosen == -1)
		halt();
	
	if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)	
		ofw_stdout = 0;
	
	ofw_mmu = ofw_open("/mmu");
	if (ofw_mmu == -1) {
		puts("Unable to open /mmu node\n");
		halt();
	}
}

void halt(void)
{
	ofw_call("exit", 0, 0);
}


int ofw_call(const char *service, const int nargs, const int nret, ...)
{
	va_list list;
	ofw_args_t args;
	int i;
	
	args.service = service;
	args.nargs = nargs;
	args.nret = nret;
	
	va_start(list, nret);
	for (i = 0; i < nargs; i++)
		args.args[i] = va_arg(list, ofw_arg_t);
	va_end(list);
	
	for (i = 0; i < nret; i++)
		args.args[i + nargs] = 0;
	
	ofw(&args);
	
	return args.args[nargs];
}


ihandle ofw_open(const char *name)
{
	return ofw_call("open", 1, 1, name);
}


void ofw_write(const char *str, const int len)
{
	if (ofw_stdout == 0)
		return;
	
	ofw_call("write", 3, 1, ofw_stdout, str, len);
}


phandle ofw_find_device(const char *name)
{
	return ofw_call("finddevice", 1, 1, name);
}


int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
{
	return ofw_call("getprop", 4, 1, device, name, buf, buflen);
}


void *ofw_translate(const void *virt)
{
	return (void *) ofw_call("call-method", 7, 1, "translate", ofw_mmu, virt, 0, 0, 0, 0);
}


int ofw_map(const void *phys, const void *virt, const int size, const int mode)
{
	return ofw_call("call-method", 6, 1, "map", ofw_mmu, mode, size, virt, phys);
}