tree.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

/*
 * tree.c: PROM component device tree code.
 *
 * Copyright (C) 1996 David S. Miller ([e-mail])
 *
 * $Id: tree.c,v 1.1 1998/10/18 13:32:10 tsbogend Exp $
 */
#include <linux/init.h>
#include <asm/sgialib.h>

#define DEBUG_PROM_TREE

pcomponent * __init prom_getsibling(pcomponent *this)
{
	if(this == PROM_NULL_COMPONENT)
		return PROM_NULL_COMPONENT;
	return romvec->next_component(this);
}

pcomponent * __init prom_getchild(pcomponent *this)
{
	return romvec->child_component(this);
}

pcomponent * __init prom_getparent(pcomponent *child)
{
	if(child == PROM_NULL_COMPONENT)
		return PROM_NULL_COMPONENT;
	return romvec->parent_component(child);
}

long __init prom_getcdata(void *buffer, pcomponent *this)
{
	return romvec->component_data(buffer, this);
}

pcomponent * __init prom_childadd(pcomponent *this, pcomponent *tmp, void *data)
{
	return romvec->child_add(this, tmp, data);
}

long __init prom_delcomponent(pcomponent *this)
{
	return romvec->comp_del(this);
}

pcomponent * __init prom_componentbypath(char *path)
{
	return romvec->component_by_path(path);
}

#ifdef DEBUG_PROM_TREE
static char *classes[] = {
	"system", "processor", "cache", "adapter", "controller", "peripheral",
	"memory"
};

static char *types[] = {
	"arc", "cpu", "fpu", "picache", "pdcache", "sicache", "sdcache", "sccache",
	"memdev", "eisa adapter", "tc adapter", "scsi adapter", "dti adapter",
	"multi-func adapter", "disk controller", "tp controller",
	"cdrom controller", "worm controller", "serial controller",
	"net controller", "display controller", "parallel controller",
	"pointer controller", "keyboard controller", "audio controller",
	"misc controller", "disk peripheral", "floppy peripheral",
	"tp peripheral", "modem peripheral", "monitor peripheral",
	"printer peripheral", "pointer peripheral", "keyboard peripheral",
	"terminal peripheral", "line peripheral", "net peripheral",
	"misc peripheral", "anonymous"
};

static char *iflags[] = {
	"bogus", "read only", "removable", "console in", "console out",
	"input", "output"
};

static void __init dump_component(pcomponent *p)
{
	prom_printf("[%p]:class<%s>type<%s>flags<%s>ver<%d>rev<%d>",
		    p, classes[p->class], types[p->type],
		    iflags[p->iflags], p->vers, p->rev);
	prom_printf("key<%08lx>\n\tamask<%08lx>cdsize<%d>ilen<%d>iname<%s>\n",
		    p->key, p->amask, (int)p->cdsize, (int)p->ilen, p->iname);
}

static void __init traverse(pcomponent *p, int op)
{
	dump_component(p);
	if(prom_getchild(p))
		traverse(prom_getchild(p), 1);
	if(prom_getsibling(p) && op)
		traverse(prom_getsibling(p), 1);
}

void __init prom_testtree(void)
{
	pcomponent *p;

	p = prom_getchild(PROM_NULL_COMPONENT);
	dump_component(p);
	p = prom_getchild(p);
	while(p) {
		dump_component(p);
		p = prom_getsibling(p);
	}
	prom_printf("press a key\n");
	prom_getchar();
}
#endif