identify.c

来自「ARM 嵌入式 系统 设计与实例开发 实验教材 二源码」· C语言 代码 · 共 80 行

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * identify.c: identify machine by looking up system identifier
 *
 * Copyright (C) 1998 Thomas Bogendoerfer
 * 
 * This code is based on arch/mips/sgi/kernel/system.c, which is
 * 
 * Copyright (C) 1996 David S. Miller ([e-mail])
 */
#include <linux/init.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>

#include <asm/sgialib.h>
#include <asm/bootinfo.h>

struct smatch {
	char *name;
	int group;
	int type;
	int flags;
};

static struct smatch mach_table[] = {
	{ "SGI-IP22", MACH_GROUP_SGI, MACH_SGI_INDY, PROM_FLAG_ARCS },
	{ "SGI-IP27", MACH_GROUP_SGI, MACH_SGI_IP27, PROM_FLAG_ARCS },
	{ "Microsoft-Jazz", MACH_GROUP_JAZZ, MACH_MIPS_MAGNUM_4000, 0 },
	{ "PICA-61", MACH_GROUP_JAZZ, MACH_ACER_PICA_61, 0 },
	{ "RM200PCI", MACH_GROUP_SNI_RM, MACH_SNI_RM200_PCI, 0 }
};

int prom_flags;

static struct smatch * __init
string_to_mach(const char *s)
{
	int i;
    
	for (i = 0; i < (sizeof (mach_table) / sizeof (mach_table[0])); i++) {
		if(!strcmp(s, mach_table[i].name))
			return &mach_table[i];
	}
	panic("\nYeee, could not determine architecture type <%s>", s);

	return NULL;
}

void __init
prom_identify_arch(void)
{
	pcomponent *p;
	struct smatch *mach;
	const char *iname;

	/* The root component tells us what machine architecture we
	   have here.  */
	p = ArcGetChild(PROM_NULL_COMPONENT);
	if (p == NULL) {
#ifdef CONFIG_SGI_IP27
		/* IP27 PROM bisbehaves, seems to not implement ARC
		   GetChild().  So we just assume it's an IP27.  */
		iname = "SGI-IP27";
#endif
	} else
		iname = (char *) (long) p->iname;

	printk("ARCH: %s\n", iname);
	mach = string_to_mach(iname);

	mips_machgroup = mach->group;
	mips_machtype = mach->type;
	prom_flags = mach->flags;
}