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  */
25 typedef u32 bi_rec_field;
26 
27 struct 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 
bi_rec_init(unsigned long addr)41 static __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 
bi_rec_alloc(struct bi_record * rec,unsigned long args)49 static __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 
bi_rec_alloc_bytes(struct bi_record * rec,unsigned long bytes)57 static __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 
bi_rec_next(struct bi_record * rec)65 static __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