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/*
* arch/ppc/common/bootinfo.c
*
* General bootinfo record utilities
* Author: Randy Vinson <rvinson@mvista.com>
*
* 2002 (c) MontaVista Software, Inc. This file is licensed under the terms
* of the GNU General Public License version 2. This program is licensed
* "as is" without any warranty of any kind, whether express or implied.
*/
#include <linux/types.h>
#include <linux/string.h>
#include <asm/bootinfo.h>
#include "nonstdio.h"
static struct bi_record * birec = NULL;
static struct bi_record *
__bootinfo_build(struct bi_record *rec, unsigned long tag, unsigned long size,
void *data)
{
/* set the tag */
rec->tag = tag;
/* if the caller has any data, copy it */
if (size)
memcpy(rec->data, (char *)data, size);
/* set the record size */
rec->size = sizeof(struct bi_record) + size;
/* advance to the next available space */
rec = (struct bi_record *)((unsigned long)rec + rec->size);
return rec;
}
void
bootinfo_init(struct bi_record *rec)
{
/* save start of birec area */
birec = rec;
/* create an empty list */
rec = __bootinfo_build(rec, BI_FIRST, 0, NULL);
(void) __bootinfo_build(rec, BI_LAST, 0, NULL);
}
void
bootinfo_append(unsigned long tag, unsigned long size, void * data)
{
struct bi_record *rec = birec;
/* paranoia */
if ((rec == NULL) || (rec->tag != BI_FIRST))
return;
/* find the last entry in the list */
while (rec->tag != BI_LAST)
rec = (struct bi_record *)((ulong)rec + rec->size);
/* overlay BI_LAST record with new one and tag on a new BI_LAST */
rec = __bootinfo_build(rec, tag, size, data);
(void) __bootinfo_build(rec, BI_LAST, 0, NULL);
}
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