| Jorgen Lundman | 4d3c95f | 2012-07-19 20:48:25 +0000 | [diff] [blame] | 1 | /* |
| 2 | * GRUB -- GRand Unified Bootloader |
| 3 | * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. |
| 4 | * |
| Wolfgang Denk | 1a45966 | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 5 | * SPDX-License-Identifier: GPL-2.0+ |
| Jorgen Lundman | 4d3c95f | 2012-07-19 20:48:25 +0000 | [diff] [blame] | 6 | */ |
| 7 | /* |
| 8 | * Copyright 2007 Sun Microsystems, Inc. All rights reserved. |
| 9 | * Use is subject to license terms. |
| 10 | */ |
| 11 | |
| 12 | #ifndef _SYS_ZAP_LEAF_H |
| 13 | #define _SYS_ZAP_LEAF_H |
| 14 | |
| 15 | #define ZAP_LEAF_MAGIC 0x2AB1EAF |
| 16 | |
| 17 | /* chunk size = 24 bytes */ |
| 18 | #define ZAP_LEAF_CHUNKSIZE 24 |
| 19 | |
| 20 | /* |
| 21 | * The amount of space within the chunk available for the array is: |
| 22 | * chunk size - space for type (1) - space for next pointer (2) |
| 23 | */ |
| 24 | #define ZAP_LEAF_ARRAY_BYTES (ZAP_LEAF_CHUNKSIZE - 3) |
| 25 | |
| 26 | typedef enum zap_chunk_type { |
| 27 | ZAP_CHUNK_FREE = 253, |
| 28 | ZAP_CHUNK_ENTRY = 252, |
| 29 | ZAP_CHUNK_ARRAY = 251, |
| 30 | ZAP_CHUNK_TYPE_MAX = 250 |
| 31 | } zap_chunk_type_t; |
| 32 | |
| 33 | /* |
| 34 | * TAKE NOTE: |
| 35 | * If zap_leaf_phys_t is modified, zap_leaf_byteswap() must be modified. |
| 36 | */ |
| 37 | typedef struct zap_leaf_phys { |
| 38 | struct zap_leaf_header { |
| 39 | uint64_t lh_block_type; /* ZBT_LEAF */ |
| 40 | uint64_t lh_pad1; |
| 41 | uint64_t lh_prefix; /* hash prefix of this leaf */ |
| 42 | uint32_t lh_magic; /* ZAP_LEAF_MAGIC */ |
| 43 | uint16_t lh_nfree; /* number free chunks */ |
| 44 | uint16_t lh_nentries; /* number of entries */ |
| 45 | uint16_t lh_prefix_len; /* num bits used to id this */ |
| 46 | |
| 47 | /* above is accessable to zap, below is zap_leaf private */ |
| 48 | |
| 49 | uint16_t lh_freelist; /* chunk head of free list */ |
| 50 | uint8_t lh_pad2[12]; |
| 51 | } l_hdr; /* 2 24-byte chunks */ |
| 52 | |
| 53 | /* |
| 54 | * The header is followed by a hash table with |
| 55 | * ZAP_LEAF_HASH_NUMENTRIES(zap) entries. The hash table is |
| 56 | * followed by an array of ZAP_LEAF_NUMCHUNKS(zap) |
| 57 | * zap_leaf_chunk structures. These structures are accessed |
| 58 | * with the ZAP_LEAF_CHUNK() macro. |
| 59 | */ |
| 60 | |
| 61 | uint16_t l_hash[1]; |
| 62 | } zap_leaf_phys_t; |
| 63 | |
| 64 | typedef union zap_leaf_chunk { |
| 65 | struct zap_leaf_entry { |
| 66 | uint8_t le_type; /* always ZAP_CHUNK_ENTRY */ |
| 67 | uint8_t le_int_size; /* size of ints */ |
| 68 | uint16_t le_next; /* next entry in hash chain */ |
| 69 | uint16_t le_name_chunk; /* first chunk of the name */ |
| 70 | uint16_t le_name_length; /* bytes in name, incl null */ |
| 71 | uint16_t le_value_chunk; /* first chunk of the value */ |
| 72 | uint16_t le_value_length; /* value length in ints */ |
| 73 | uint32_t le_cd; /* collision differentiator */ |
| 74 | uint64_t le_hash; /* hash value of the name */ |
| 75 | } l_entry; |
| 76 | struct zap_leaf_array { |
| 77 | uint8_t la_type; /* always ZAP_CHUNK_ARRAY */ |
| 78 | union { |
| 79 | uint8_t la_array[ZAP_LEAF_ARRAY_BYTES]; |
| 80 | uint64_t la_array64; |
| 81 | } __attribute__ ((packed)); |
| 82 | uint16_t la_next; /* next blk or CHAIN_END */ |
| 83 | } l_array; |
| 84 | struct zap_leaf_free { |
| 85 | uint8_t lf_type; /* always ZAP_CHUNK_FREE */ |
| 86 | uint8_t lf_pad[ZAP_LEAF_ARRAY_BYTES]; |
| 87 | uint16_t lf_next; /* next in free list, or CHAIN_END */ |
| 88 | } l_free; |
| 89 | } zap_leaf_chunk_t; |
| 90 | |
| 91 | #endif /* _SYS_ZAP_LEAF_H */ |