1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * asm/bootinfo.h -- Definition of the Linux/m68k boot information structure
4 *
5 * Copyright 1992 by Greg Harp
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive
9 * for more details.
10 */
11
12#ifndef _ASM_M68K_BOOTINFO_H
13#define _ASM_M68K_BOOTINFO_H
14
15
16#include <linux/types.h>
17
18
19#ifndef __ASSEMBLER__
20
21 /*
22 * Bootinfo definitions
23 *
24 * This is an easily parsable and extendable structure containing all
25 * information to be passed from the bootstrap to the kernel.
26 *
27 * This way I hope to keep all future changes back/forewards compatible.
28 * Thus, keep your fingers crossed...
29 *
30 * This structure is copied right after the kernel by the bootstrap
31 * routine.
32 */
33
34struct bi_record {
35 __be16 tag; /* tag ID */
36 __be16 size; /* size of record (in bytes) */
37 __be32 data[]; /* data */
38};
39
40
41struct mem_info {
42 __be32 addr; /* physical address of memory chunk */
43 __be32 size; /* length of memory chunk (in bytes) */
44};
45
46#endif /* __ASSEMBLER__ */
47
48
49 /*
50 * Tag Definitions
51 *
52 * Machine independent tags start counting from 0x0000
53 * Machine dependent tags start counting from 0x8000
54 */
55
56#define BI_LAST 0x0000 /* last record (sentinel) */
57#define BI_MACHTYPE 0x0001 /* machine type (__be32) */
58#define BI_CPUTYPE 0x0002 /* cpu type (__be32) */
59#define BI_FPUTYPE 0x0003 /* fpu type (__be32) */
60#define BI_MMUTYPE 0x0004 /* mmu type (__be32) */
61#define BI_MEMCHUNK 0x0005 /* memory chunk address and size */
62 /* (struct mem_info) */
63#define BI_RAMDISK 0x0006 /* ramdisk address and size */
64 /* (struct mem_info) */
65#define BI_COMMAND_LINE 0x0007 /* kernel command line parameters */
66 /* (string) */
67/*
68 * A random seed used to initialize the RNG. Record format:
69 *
70 * - length [ 2 bytes, 16-bit big endian ]
71 * - seed data [ `length` bytes, padded to preserve 4-byte struct alignment ]
72 */
73#define BI_RNG_SEED 0x0008
74
75
76 /*
77 * Linux/m68k Architectures (BI_MACHTYPE)
78 */
79
80#define MACH_AMIGA 1
81#define MACH_ATARI 2
82#define MACH_MAC 3
83#define MACH_APOLLO 4
84#define MACH_SUN3 5
85#define MACH_MVME147 6
86#define MACH_MVME16x 7
87#define MACH_BVME6000 8
88#define MACH_HP300 9
89#define MACH_Q40 10
90#define MACH_SUN3X 11
91#define MACH_M54XX 12
92#define MACH_M5441X 13
93#define MACH_VIRT 14
94
95
96 /*
97 * CPU, FPU and MMU types (BI_CPUTYPE, BI_FPUTYPE, BI_MMUTYPE)
98 *
99 * Note: we may rely on the following equalities:
100 *
101 * CPU_68020 == MMU_68851
102 * CPU_68030 == MMU_68030
103 * CPU_68040 == FPU_68040 == MMU_68040
104 * CPU_68060 == FPU_68060 == MMU_68060
105 */
106
107#define CPUB_68020 0
108#define CPUB_68030 1
109#define CPUB_68040 2
110#define CPUB_68060 3
111#define CPUB_COLDFIRE 4
112
113#define CPU_68020 (1 << CPUB_68020)
114#define CPU_68030 (1 << CPUB_68030)
115#define CPU_68040 (1 << CPUB_68040)
116#define CPU_68060 (1 << CPUB_68060)
117#define CPU_COLDFIRE (1 << CPUB_COLDFIRE)
118
119#define FPUB_68881 0
120#define FPUB_68882 1
121#define FPUB_68040 2 /* Internal FPU */
122#define FPUB_68060 3 /* Internal FPU */
123#define FPUB_SUNFPA 4 /* Sun-3 FPA */
124#define FPUB_COLDFIRE 5 /* ColdFire FPU */
125
126#define FPU_68881 (1 << FPUB_68881)
127#define FPU_68882 (1 << FPUB_68882)
128#define FPU_68040 (1 << FPUB_68040)
129#define FPU_68060 (1 << FPUB_68060)
130#define FPU_SUNFPA (1 << FPUB_SUNFPA)
131#define FPU_COLDFIRE (1 << FPUB_COLDFIRE)
132
133#define MMUB_68851 0
134#define MMUB_68030 1 /* Internal MMU */
135#define MMUB_68040 2 /* Internal MMU */
136#define MMUB_68060 3 /* Internal MMU */
137#define MMUB_APOLLO 4 /* Custom Apollo */
138#define MMUB_SUN3 5 /* Custom Sun-3 */
139#define MMUB_COLDFIRE 6 /* Internal MMU */
140
141#define MMU_68851 (1 << MMUB_68851)
142#define MMU_68030 (1 << MMUB_68030)
143#define MMU_68040 (1 << MMUB_68040)
144#define MMU_68060 (1 << MMUB_68060)
145#define MMU_SUN3 (1 << MMUB_SUN3)
146#define MMU_APOLLO (1 << MMUB_APOLLO)
147#define MMU_COLDFIRE (1 << MMUB_COLDFIRE)
148
149
150 /*
151 * Stuff for bootinfo interface versioning
152 *
153 * At the start of kernel code, a 'struct bootversion' is located.
154 * bootstrap checks for a matching version of the interface before booting
155 * a kernel, to avoid user confusion if kernel and bootstrap don't work
156 * together :-)
157 *
158 * If incompatible changes are made to the bootinfo interface, the major
159 * number below should be stepped (and the minor reset to 0) for the
160 * appropriate machine. If a change is backward-compatible, the minor
161 * should be stepped. "Backwards-compatible" means that booting will work,
162 * but certain features may not.
163 */
164
165#define BOOTINFOV_MAGIC 0x4249561A /* 'BIV^Z' */
166#define MK_BI_VERSION(major, minor) (((major) << 16) + (minor))
167#define BI_VERSION_MAJOR(v) (((v) >> 16) & 0xffff)
168#define BI_VERSION_MINOR(v) ((v) & 0xffff)
169
170#ifndef __ASSEMBLER__
171
172struct bootversion {
173 __be16 branch;
174 __be32 magic;
175 struct {
176 __be32 machtype;
177 __be32 version;
178 } machversions[];
179} __attribute__((packed));
180
181#endif /* __ASSEMBLER__ */
182
183
184#endif /* _ASM_M68K_BOOTINFO_H */