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env.c

/*
 * Based on Ocelot Linux port, which is
 * Copyright 2001 MontaVista Software Inc.
 * Author: jsun@mvista.com or jsun@junsun.net
 *
 * Copyright 2003 ICT CAS
 * Author: Michael Guo <guoyi@ict.ac.cn>
 *
 * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
 * Author: Fuxin Zhang, zhangfx@lemote.com
 *
 * Copyright (C) 2009 Lemote Inc. & Insititute of Computing Technology
 * Author: Wu Zhangjin, wuzj@lemote.com
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#include <asm/bootinfo.h>

#include <loongson.h>

unsigned long bus_clock, cpu_clock_freq;
unsigned long memsize, highmemsize;

/* pmon passes arguments in 32bit pointers */
int *_prom_envp;

#define parse_even_earlier(res, option, p)                        \
do {                                                  \
      if (strncmp(option, (char *)p, strlen(option)) == 0)        \
                  strict_strtol((char *)p + strlen(option"="),    \
                              10, &res);              \
} while (0)

void __init prom_init_env(void)
{
      long l;

      /* firmware arguments are initialized in head.S */
      _prom_envp = (int *)fw_arg2;

      l = (long)*_prom_envp;
      while (l != 0) {
            parse_even_earlier(bus_clock, "busclock", l);
            parse_even_earlier(cpu_clock_freq, "cpuclock", l);
            parse_even_earlier(memsize, "memsize", l);
            parse_even_earlier(highmemsize, "highmemsize", l);
            _prom_envp++;
            l = (long)*_prom_envp;
      }
      if (memsize == 0)
            memsize = 256;

      pr_info("busclock=%ld, cpuclock=%ld, memsize=%ld, highmemsize=%ld\n",
            bus_clock, cpu_clock_freq, memsize, highmemsize);
}

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