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
  24 unsigned long bus_clock, cpu_clock_freq;
  25 unsigned long memsize, highmemsize;
  26
  27 /* pmon passes arguments in 32bit pointers */
  28 int *_prom_envp;
  29
  30 #define parse_even_earlier(res, option, p)                              \
  31 do {                                                                    \
  32         if (strncmp(option, (char *)p, strlen(option)) == 0)            \
  33                         strict_strtol((char *)p + strlen(option"="),    \
  34                                         10, &res);                      \
  35 } while (0)
  36
  37 void __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 }