1/*
2 * Non-machine dependent bootinfo structure.  Basic idea
3 * borrowed from the m68k.
4 *
5 * Copyright (C) 1999 Cort Dougan <cort@ppc.kernel.org>
6 * Copyright (c) 2001 PPC64 Team, IBM Corp
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14
15#ifndef _PPC64_BOOTINFO_H
16#define _PPC64_BOOTINFO_H
17
18#include <asm/types.h>
19
20/* We use a u32 for the type of the fields since they're written by
21 * the bootloader which is a 32-bit process and read by the kernel
22 * which is a 64-bit process.  This way they can both agree on the
23 * size of the type.
24 */
25typedef u32 bi_rec_field;
26
27struct bi_record {
28	bi_rec_field tag;	/* tag ID */
29	bi_rec_field size;	/* size of record (in bytes) */
30	bi_rec_field data[0];	/* data */
31};
32
33#define BI_FIRST		0x1010  /* first record - marker */
34#define BI_LAST			0x1011	/* last record - marker */
35#define BI_CMD_LINE		0x1012
36#define BI_BOOTLOADER_ID	0x1013
37#define BI_INITRD		0x1014
38#define BI_SYSMAP		0x1015
39#define BI_MACHTYPE		0x1016
40
41static __inline__ struct bi_record * bi_rec_init(unsigned long addr)
42{
43	struct bi_record *bi_recs;
44	bi_recs = (struct bi_record *)_ALIGN(addr, PAGE_SIZE);
45	bi_recs->size = 0;
46	return bi_recs;
47}
48
49static __inline__ struct bi_record * bi_rec_alloc(struct bi_record *rec,
50						  unsigned long args)
51{
52	rec = (struct bi_record *)((unsigned long)rec + rec->size);
53	rec->size = sizeof(struct bi_record) + args*sizeof(bi_rec_field);
54	return rec;
55}
56
57static __inline__ struct bi_record * bi_rec_alloc_bytes(struct bi_record *rec,
58							unsigned long bytes)
59{
60	rec = (struct bi_record *)((unsigned long)rec + rec->size);
61	rec->size = sizeof(struct bi_record) + bytes;
62	return rec;
63}
64
65static __inline__ struct bi_record * bi_rec_next(struct bi_record *rec)
66{
67	return (struct bi_record *)((unsigned long)rec + rec->size);
68}
69
70#endif /* _PPC64_BOOTINFO_H */
71