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1 | /* | |
2 | * GRUB -- GRand Unified Bootloader | |
3 | * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | /* | |
20 | * Copyright 2009 Sun Microsystems, Inc. All rights reserved. | |
21 | * Use is subject to license terms. | |
22 | */ | |
23 | ||
24 | #ifndef _SYS_ZAP_IMPL_H | |
25 | #define _SYS_ZAP_IMPL_H | |
26 | ||
27 | #define ZAP_MAGIC 0x2F52AB2ABULL | |
28 | ||
29 | #define ZAP_HASHBITS 28 | |
30 | #define MZAP_ENT_LEN 64 | |
31 | #define MZAP_NAME_LEN (MZAP_ENT_LEN - 8 - 4 - 2) | |
32 | #define MZAP_MAX_BLKSHIFT SPA_MAXBLOCKSHIFT | |
33 | #define MZAP_MAX_BLKSZ (1 << MZAP_MAX_BLKSHIFT) | |
34 | ||
35 | typedef struct mzap_ent_phys { | |
36 | grub_uint64_t mze_value; | |
37 | grub_uint32_t mze_cd; | |
38 | grub_uint16_t mze_pad; /* in case we want to chain them someday */ | |
39 | char mze_name[MZAP_NAME_LEN]; | |
40 | } mzap_ent_phys_t; | |
41 | ||
42 | typedef struct mzap_phys { | |
43 | grub_uint64_t mz_block_type; /* ZBT_MICRO */ | |
44 | grub_uint64_t mz_salt; | |
45 | grub_uint64_t mz_pad[6]; | |
46 | mzap_ent_phys_t mz_chunk[1]; | |
47 | /* actually variable size depending on block size */ | |
48 | } mzap_phys_t; | |
49 | ||
50 | /* | |
51 | * The (fat) zap is stored in one object. It is an array of | |
52 | * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of: | |
53 | * | |
54 | * ptrtbl fits in first block: | |
55 | * [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ... | |
56 | * | |
57 | * ptrtbl too big for first block: | |
58 | * [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ... | |
59 | * | |
60 | */ | |
61 | ||
62 | #define ZBT_LEAF ((1ULL << 63) + 0) | |
63 | #define ZBT_HEADER ((1ULL << 63) + 1) | |
64 | #define ZBT_MICRO ((1ULL << 63) + 3) | |
65 | /* any other values are ptrtbl blocks */ | |
66 | ||
67 | /* | |
68 | * the embedded pointer table takes up half a block: | |
69 | * block size / entry size (2^3) / 2 | |
70 | */ | |
71 | #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1) | |
72 | ||
73 | /* | |
74 | * The embedded pointer table starts half-way through the block. Since | |
75 | * the pointer table itself is half the block, it starts at (64-bit) | |
76 | * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)). | |
77 | */ | |
78 | #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \ | |
79 | ((grub_uint64_t *)(zap)->zap_f.zap_phys) \ | |
80 | [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))] | |
81 | ||
82 | /* | |
83 | * TAKE NOTE: | |
84 | * If zap_phys_t is modified, zap_byteswap() must be modified. | |
85 | */ | |
86 | typedef struct zap_phys { | |
87 | grub_uint64_t zap_block_type; /* ZBT_HEADER */ | |
88 | grub_uint64_t zap_magic; /* ZAP_MAGIC */ | |
89 | ||
90 | struct zap_table_phys { | |
91 | grub_uint64_t zt_blk; /* starting block number */ | |
92 | grub_uint64_t zt_numblks; /* number of blocks */ | |
93 | grub_uint64_t zt_shift; /* bits to index it */ | |
94 | grub_uint64_t zt_nextblk; /* next (larger) copy start block */ | |
95 | grub_uint64_t zt_blks_copied; /* number source blocks copied */ | |
96 | } zap_ptrtbl; | |
97 | ||
98 | grub_uint64_t zap_freeblk; /* the next free block */ | |
99 | grub_uint64_t zap_num_leafs; /* number of leafs */ | |
100 | grub_uint64_t zap_num_entries; /* number of entries */ | |
101 | grub_uint64_t zap_salt; /* salt to stir into hash function */ | |
102 | grub_uint64_t zap_normflags; /* flags for u8_textprep_str() */ | |
103 | grub_uint64_t zap_flags; /* zap_flag_t */ | |
104 | /* | |
105 | * This structure is followed by padding, and then the embedded | |
106 | * pointer table. The embedded pointer table takes up second | |
107 | * half of the block. It is accessed using the | |
108 | * ZAP_EMBEDDED_PTRTBL_ENT() macro. | |
109 | */ | |
110 | } zap_phys_t; | |
111 | ||
112 | #endif /* _SYS_ZAP_IMPL_H */ |