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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_ZAP_LEAF_H
#define _SYS_ZAP_LEAF_H
#define ZAP_LEAF_MAGIC 0x2AB1EAF
/* chunk size = 24 bytes */
#define ZAP_LEAF_CHUNKSIZE 24
/*
* The amount of space within the chunk available for the array is:
* chunk size - space for type (1) - space for next pointer (2)
*/
#define ZAP_LEAF_ARRAY_BYTES (ZAP_LEAF_CHUNKSIZE - 3)
typedef enum zap_chunk_type {
ZAP_CHUNK_FREE = 253,
ZAP_CHUNK_ENTRY = 252,
ZAP_CHUNK_ARRAY = 251,
ZAP_CHUNK_TYPE_MAX = 250
} zap_chunk_type_t;
/*
* TAKE NOTE:
* If zap_leaf_phys_t is modified, zap_leaf_byteswap() must be modified.
*/
typedef struct zap_leaf_phys {
struct zap_leaf_header {
uint64_t lh_block_type; /* ZBT_LEAF */
uint64_t lh_pad1;
uint64_t lh_prefix; /* hash prefix of this leaf */
uint32_t lh_magic; /* ZAP_LEAF_MAGIC */
uint16_t lh_nfree; /* number free chunks */
uint16_t lh_nentries; /* number of entries */
uint16_t lh_prefix_len; /* num bits used to id this */
/* above is accessable to zap, below is zap_leaf private */
uint16_t lh_freelist; /* chunk head of free list */
uint8_t lh_pad2[12];
} l_hdr; /* 2 24-byte chunks */
/*
* The header is followed by a hash table with
* ZAP_LEAF_HASH_NUMENTRIES(zap) entries. The hash table is
* followed by an array of ZAP_LEAF_NUMCHUNKS(zap)
* zap_leaf_chunk structures. These structures are accessed
* with the ZAP_LEAF_CHUNK() macro.
*/
uint16_t l_hash[1];
} zap_leaf_phys_t;
typedef union zap_leaf_chunk {
struct zap_leaf_entry {
uint8_t le_type; /* always ZAP_CHUNK_ENTRY */
uint8_t le_int_size; /* size of ints */
uint16_t le_next; /* next entry in hash chain */
uint16_t le_name_chunk; /* first chunk of the name */
uint16_t le_name_length; /* bytes in name, incl null */
uint16_t le_value_chunk; /* first chunk of the value */
uint16_t le_value_length; /* value length in ints */
uint32_t le_cd; /* collision differentiator */
uint64_t le_hash; /* hash value of the name */
} l_entry;
struct zap_leaf_array {
uint8_t la_type; /* always ZAP_CHUNK_ARRAY */
union {
uint8_t la_array[ZAP_LEAF_ARRAY_BYTES];
uint64_t la_array64;
} __attribute__ ((packed));
uint16_t la_next; /* next blk or CHAIN_END */
} l_array;
struct zap_leaf_free {
uint8_t lf_type; /* always ZAP_CHUNK_FREE */
uint8_t lf_pad[ZAP_LEAF_ARRAY_BYTES];
uint16_t lf_next; /* next in free list, or CHAIN_END */
} l_free;
} zap_leaf_chunk_t;
#endif /* _SYS_ZAP_LEAF_H */
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