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prom.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
 *
 * 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 <linux/init.h>
#include <linux/bootmem.h>
#include <asm/bootinfo.h>

extern unsigned long bus_clock;
extern unsigned long cpu_clock_freq;
extern unsigned int memsize, highmemsize;
extern int putDebugChar(unsigned char byte);

static int argc;
/* pmon passes arguments in 32bit pointers */
static int *arg;
static int *env;

const char *get_system_type(void)
{
      return "lemote-fulong";
}

void __init prom_init_cmdline(void)
{
      int i;
      long l;

      /* arg[0] is "g", the rest is boot parameters */
      arcs_cmdline[0] = '\0';
      for (i = 1; i < argc; i++) {
            l = (long)arg[i];
            if (strlen(arcs_cmdline) + strlen(((char *)l) + 1)
                >= sizeof(arcs_cmdline))
                  break;
            strcat(arcs_cmdline, ((char *)l));
            strcat(arcs_cmdline, " ");
      }
}

void __init prom_init(void)
{
      long l;
      argc = fw_arg0;
      arg = (int *)fw_arg1;
      env = (int *)fw_arg2;

      prom_init_cmdline();

      if ((strstr(arcs_cmdline, "console=")) == NULL)
            strcat(arcs_cmdline, " console=ttyS0,115200");
      if ((strstr(arcs_cmdline, "root=")) == NULL)
            strcat(arcs_cmdline, " root=/dev/hda1");

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

      l = (long)*env;
      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);
            env++;
            l = (long)*env;
      }
      if (memsize == 0)
            memsize = 256;

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

void __init prom_free_prom_memory(void)
{
}

void prom_putchar(char c)
{
      putDebugChar(c);
}

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