1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
3 * asm/bootinfo.h -- Definition of the Linux/m68k boot information structure
5 * Copyright 1992 by Greg Harp
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
12 #ifndef _UAPI_ASM_M68K_BOOTINFO_H
13 #define _UAPI_ASM_M68K_BOOTINFO_H
17 * Bootinfo definitions
19 * This is an easily parsable and extendable structure containing all
20 * information to be passed from the bootstrap to the kernel.
22 * This way I hope to keep all future changes back/forewards compatible.
23 * Thus, keep your fingers crossed...
25 * This structure is copied right after the kernel by the bootstrap
30 uint16_t tag
; /* tag ID */
31 uint16_t size
; /* size of record (in bytes) */
32 uint32_t data
[0]; /* data */
37 uint32_t addr
; /* physical address of memory chunk */
38 uint32_t size
; /* length of memory chunk (in bytes) */
45 * Machine independent tags start counting from 0x0000
46 * Machine dependent tags start counting from 0x8000
49 #define BI_LAST 0x0000 /* last record (sentinel) */
50 #define BI_MACHTYPE 0x0001 /* machine type (uint32_t) */
51 #define BI_CPUTYPE 0x0002 /* cpu type (uint32_t) */
52 #define BI_FPUTYPE 0x0003 /* fpu type (uint32_t) */
53 #define BI_MMUTYPE 0x0004 /* mmu type (uint32_t) */
54 #define BI_MEMCHUNK 0x0005 /* memory chunk address and size */
55 /* (struct mem_info) */
56 #define BI_RAMDISK 0x0006 /* ramdisk address and size */
57 /* (struct mem_info) */
58 #define BI_COMMAND_LINE 0x0007 /* kernel command line parameters */
63 * Linux/m68k Architectures (BI_MACHTYPE)
71 #define MACH_MVME147 6
72 #define MACH_MVME16x 7
73 #define MACH_BVME6000 8
78 #define MACH_M5441X 13
83 * CPU, FPU and MMU types (BI_CPUTYPE, BI_FPUTYPE, BI_MMUTYPE)
85 * Note: we may rely on the following equalities:
87 * CPU_68020 == MMU_68851
88 * CPU_68030 == MMU_68030
89 * CPU_68040 == FPU_68040 == MMU_68040
90 * CPU_68060 == FPU_68060 == MMU_68060
97 #define CPUB_COLDFIRE 4
99 #define CPU_68020 (1 << CPUB_68020)
100 #define CPU_68030 (1 << CPUB_68030)
101 #define CPU_68040 (1 << CPUB_68040)
102 #define CPU_68060 (1 << CPUB_68060)
103 #define CPU_COLDFIRE (1 << CPUB_COLDFIRE)
107 #define FPUB_68040 2 /* Internal FPU */
108 #define FPUB_68060 3 /* Internal FPU */
109 #define FPUB_SUNFPA 4 /* Sun-3 FPA */
110 #define FPUB_COLDFIRE 5 /* ColdFire FPU */
112 #define FPU_68881 (1 << FPUB_68881)
113 #define FPU_68882 (1 << FPUB_68882)
114 #define FPU_68040 (1 << FPUB_68040)
115 #define FPU_68060 (1 << FPUB_68060)
116 #define FPU_SUNFPA (1 << FPUB_SUNFPA)
117 #define FPU_COLDFIRE (1 << FPUB_COLDFIRE)
120 #define MMUB_68030 1 /* Internal MMU */
121 #define MMUB_68040 2 /* Internal MMU */
122 #define MMUB_68060 3 /* Internal MMU */
123 #define MMUB_APOLLO 4 /* Custom Apollo */
124 #define MMUB_SUN3 5 /* Custom Sun-3 */
125 #define MMUB_COLDFIRE 6 /* Internal MMU */
127 #define MMU_68851 (1 << MMUB_68851)
128 #define MMU_68030 (1 << MMUB_68030)
129 #define MMU_68040 (1 << MMUB_68040)
130 #define MMU_68060 (1 << MMUB_68060)
131 #define MMU_SUN3 (1 << MMUB_SUN3)
132 #define MMU_APOLLO (1 << MMUB_APOLLO)
133 #define MMU_COLDFIRE (1 << MMUB_COLDFIRE)
137 * Stuff for bootinfo interface versioning
139 * At the start of kernel code, a 'struct bootversion' is located.
140 * bootstrap checks for a matching version of the interface before booting
141 * a kernel, to avoid user confusion if kernel and bootstrap don't work
144 * If incompatible changes are made to the bootinfo interface, the major
145 * number below should be stepped (and the minor reset to 0) for the
146 * appropriate machine. If a change is backward-compatible, the minor
147 * should be stepped. "Backwards-compatible" means that booting will work,
148 * but certain features may not.
151 #define BOOTINFOV_MAGIC 0x4249561A /* 'BIV^Z' */
152 #define MK_BI_VERSION(major, minor) (((major) << 16) + (minor))
153 #define BI_VERSION_MAJOR(v) (((v) >> 16) & 0xffff)
154 #define BI_VERSION_MINOR(v) ((v) & 0xffff)
166 #endif /* _UAPI_ASM_M68K_BOOTINFO_H */