prom.c

linux 内核源代码

/*
 * Based on Ocelot Linux port, which is
 * Copyright 2001 MontaVista Software Inc.
 * Author: [e-mail] or [e-mail]
 *
 * Copyright 2003 ICT CAS
 * Author: Michael Guo <[e-mail]>
 *
 * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
 * Author: Fuxin Zhang, [e-mail]
 *
 * 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;

	mips_machtype = MACH_LEMOTE_FULONG;

	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);
}