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/*
 * 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"

#define MAX_OFW_ARGS    10

typedef unsigned int ofw_arg_t;
typedef unsigned int ihandle;
typedef unsigned int phandle;

/** OpenFirmware command structure
 *
 */
typedef struct {
    const char *service;          /**< Command name */
    unsigned int nargs;           /**< Number of in arguments */
    unsigned int nret;            /**< Number of out arguments */
    ofw_arg_t args[MAX_OFW_ARGS]; /**< List of arguments */
} ofw_args_t;

typedef void (*ofw_entry)(ofw_args_t *);


ofw_entry ofw;

phandle ofw_chosen;
ihandle ofw_mmu;
ihandle ofw_stdout;


static 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];
}


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


static 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);
}

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


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);
}


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


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);
}


int ofw_memmap(memmap_t *map)
{
    int i;
    int ret;

    phandle handle = ofw_find_device("/memory");
    if (handle == -1)
        return false;
    
    ret = ofw_get_property(handle, "reg", &map->zones, sizeof(map->zones));
    if (ret == -1)
        return false;
    
    map->total = 0;
    map->count = 0;
    for (i = 0; i < MEMMAP_MAX_RECORDS; i++) {
        if (map->zones[i].size == 0)
            break;
        map->count++;
        map->total += map->zones[i].size;
    }
}