LXR linux/arch/mips/loongson/common/env.c

   1/*
   2 * Based on Ocelot Linux port, which is
   3 * Copyright 2001 MontaVista Software Inc.
   4 * Author: jsun@mvista.com or jsun@junsun.net
   5 *
   6 * Copyright 2003 ICT CAS
   7 * Author: Michael Guo <guoyi@ict.ac.cn>
   8 *
   9 * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
  10 * Author: Fuxin Zhang, zhangfx@lemote.com
  11 *
  12 * Copyright (C) 2009 Lemote Inc. & Insititute of Computing Technology
  13 * Author: Wu Zhangjin, wuzj@lemote.com
  14 *
  15 * This program is free software; you can redistribute  it and/or modify it
  16 * under  the terms of  the GNU General  Public License as published by the
  17 * Free Software Foundation;  either version 2 of the  License, or (at your
  18 * option) any later version.
  19 */
  20#include <asm/bootinfo.h>
  21
  22#include <loongson.h>
  23
  24unsigned long bus_clock, cpu_clock_freq;
  25unsigned long memsize, highmemsize;
  26
  27/* pmon passes arguments in 32bit pointers */
  28int *_prom_envp;
  29
  30#define parse_even_earlier(res, option, p)                              \
  31do {                                                                    \
  32        if (strncmp(option, (char *)p, strlen(option)) == 0)            \
  33                        strict_strtol((char *)p + strlen(option"="),    \
  34                                        10, &res);                      \
  35} while (0)
  36
  37void __init prom_init_env(void)
  38{
  39        long l;
  40
  41        /* firmware arguments are initialized in head.S */
  42        _prom_envp = (int *)fw_arg2;
  43
  44        l = (long)*_prom_envp;
  45        while (l != 0) {
  46                parse_even_earlier(bus_clock, "busclock", l);
  47                parse_even_earlier(cpu_clock_freq, "cpuclock", l);
  48                parse_even_earlier(memsize, "memsize", l);
  49                parse_even_earlier(highmemsize, "highmemsize", l);
  50                _prom_envp++;
  51                l = (long)*_prom_envp;
  52        }
  53        if (memsize == 0)
  54                memsize = 256;
  55
  56        pr_info("busclock=%ld, cpuclock=%ld, memsize=%ld, highmemsize=%ld\n",
  57                bus_clock, cpu_clock_freq, memsize, highmemsize);
  58}
  59