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