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1/*
2 * asm/bootinfo.h -- Definition of the Linux/m68k boot information structure
3 *
4 * Copyright 1992 by Greg Harp
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive
8 * for more details.
9 */
10
11#ifndef _UAPI_ASM_M68K_BOOTINFO_H
12#define _UAPI_ASM_M68K_BOOTINFO_H
13
14#include <linux/types.h>
15
16
17#ifndef __ASSEMBLY__
18
19 /*
20 * Bootinfo definitions
21 *
22 * This is an easily parsable and extendable structure containing all
23 * information to be passed from the bootstrap to the kernel.
24 *
25 * This way I hope to keep all future changes back/forewards compatible.
26 * Thus, keep your fingers crossed...
27 *
28 * This structure is copied right after the kernel by the bootstrap
29 * routine.
30 */
31
32struct bi_record {
33 unsigned short tag; /* tag ID */
34 unsigned short size; /* size of record (in bytes) */
35 unsigned long data[0]; /* data */
36};
37
38#endif /* __ASSEMBLY__ */
39
40
41 /*
42 * Tag Definitions
43 *
44 * Machine independent tags start counting from 0x0000
45 * Machine dependent tags start counting from 0x8000
46 */
47
48#define BI_LAST 0x0000 /* last record (sentinel) */
49#define BI_MACHTYPE 0x0001 /* machine type (u_long) */
50#define BI_CPUTYPE 0x0002 /* cpu type (u_long) */
51#define BI_FPUTYPE 0x0003 /* fpu type (u_long) */
52#define BI_MMUTYPE 0x0004 /* mmu type (u_long) */
53#define BI_MEMCHUNK 0x0005 /* memory chunk address and size */
54 /* (struct mem_info) */
55#define BI_RAMDISK 0x0006 /* ramdisk address and size */
56 /* (struct mem_info) */
57#define BI_COMMAND_LINE 0x0007 /* kernel command line parameters */
58 /* (string) */
59
60
61 /*
62 * Stuff for bootinfo interface versioning
63 *
64 * At the start of kernel code, a 'struct bootversion' is located.
65 * bootstrap checks for a matching version of the interface before booting
66 * a kernel, to avoid user confusion if kernel and bootstrap don't work
67 * together :-)
68 *
69 * If incompatible changes are made to the bootinfo interface, the major
70 * number below should be stepped (and the minor reset to 0) for the
71 * appropriate machine. If a change is backward-compatible, the minor
72 * should be stepped. "Backwards-compatible" means that booting will work,
73 * but certain features may not.
74 */
75
76#define BOOTINFOV_MAGIC 0x4249561A /* 'BIV^Z' */
77#define MK_BI_VERSION(major, minor) (((major) << 16) + (minor))
78#define BI_VERSION_MAJOR(v) (((v) >> 16) & 0xffff)
79#define BI_VERSION_MINOR(v) ((v) & 0xffff)
80
81#ifndef __ASSEMBLY__
82
83struct bootversion {
84 unsigned short branch;
85 unsigned long magic;
86 struct {
87 unsigned long machtype;
88 unsigned long version;
89 } machversions[0];
90} __packed;
91
92#endif /* __ASSEMBLY__ */
93
94
95#endif /* _UAPI_ASM_M68K_BOOTINFO_H */