1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * (C) Copyright 2000
4  * Hans-Joerg Frieden, Hyperion Entertainment
5  * Hans-JoergF@hyperion-entertainment.com
6  */
7 
8 #ifndef _DISK_PART_AMIGA_H
9 #define _DISK_PART_AMIGA_H
10 
11 #if CONFIG_IS_ENABLED(ISO_PARTITION)
12 /* Make the buffers bigger if ISO partition support is enabled -- CD-ROMS
13    have 2048 byte blocks */
14 #define DEFAULT_SECTOR_SIZE   2048
15 #else
16 #define DEFAULT_SECTOR_SIZE	512
17 #endif
18 
19 #define AMIGA_BLOCK_LIMIT 16
20 
21 /*
22  * Amiga disks have a very open structure. The head for the partition table information
23  * is stored somewhere within the first 16 blocks on disk, and is called the
24  * "RigidDiskBlock".
25  */
26 
27 struct rigid_disk_block
28 {
29     u32 id;
30     u32 summed_longs;
31     s32 chk_sum;
32     u32 host_id;
33     u32 block_bytes;
34     u32 flags;
35     u32 bad_block_list;
36     u32 partition_list;
37     u32 file_sys_header_list;
38     u32 drive_init;
39     u32 bootcode_block;
40     u32 reserved_1[5];
41 
42     /* Physical drive geometry */
43     u32 cylinders;
44     u32 sectors;
45     u32 heads;
46     u32 interleave;
47     u32 park;
48     u32 reserved_2[3];
49     u32 write_pre_comp;
50     u32 reduced_write;
51     u32 step_rate;
52     u32 reserved_3[5];
53 
54     /* logical drive geometry */
55     u32 rdb_blocks_lo;
56     u32 rdb_blocks_hi;
57     u32 lo_cylinder;
58     u32 hi_cylinder;
59     u32 cyl_blocks;
60     u32 auto_park_seconds;
61     u32 high_rdsk_block;
62     u32 reserved_4;
63 
64     char disk_vendor[8];
65     char disk_product[16];
66     char disk_revision[4];
67     char controller_vendor[8];
68     char controller_product[16];
69     char controller_revision[4];
70 
71     u32 reserved_5[10];
72 };
73 
74 /*
75  * Each partition on this drive is defined by such a block
76  */
77 
78 struct partition_block
79 {
80     u32 id;
81     u32 summed_longs;
82     s32 chk_sum;
83     u32 host_id;
84     u32 next;
85     u32 flags;
86     u32 reserved_1[2];
87     u32 dev_flags;
88     char drive_name[32];
89     u32 reserved_2[15];
90     u32 environment[17];
91     u32 reserved_3[15];
92 };
93 
94 struct bootcode_block
95 {
96     u32   id;
97     u32   summed_longs;
98     s32   chk_sum;
99     u32   host_id;
100     u32   next;
101     u32   load_data[123];
102 };
103 
104 #define AMIGA_ID_RDISK                  0x5244534B
105 #define AMIGA_ID_PART                   0x50415254
106 #define AMIGA_ID_BOOT                   0x424f4f54
107 
108 /*
109  * The environment array in the partition block
110  * describes the partition
111  */
112 
113 struct amiga_part_geometry
114 {
115     u32 table_size;
116     u32 size_blocks;
117     u32 unused1;
118     u32 surfaces;
119     u32 sector_per_block;
120     u32 block_per_track;
121     u32 reserved;
122     u32 prealloc;
123     u32 interleave;
124     u32 low_cyl;
125     u32 high_cyl;
126     u32 num_buffers;
127     u32 buf_mem_type;
128     u32 max_transfer;
129     u32 mask;
130     s32 boot_priority;
131     u32 dos_type;
132     u32 baud;
133     u32 control;
134     u32 boot_blocks;
135 };
136 
137 #endif /* _DISK_PART_AMIGA_H_ */
138