99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
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*/
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/*
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* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
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*/
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#ifndef _SYS_ZAP_IMPL_H
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#define _SYS_ZAP_IMPL_H
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#define ZAP_MAGIC 0x2F52AB2ABULL
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#define ZAP_HASHBITS 28
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#define MZAP_ENT_LEN 64
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#define MZAP_NAME_LEN (MZAP_ENT_LEN - 8 - 4 - 2)
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#define MZAP_MAX_BLKSHIFT SPA_MAXBLOCKSHIFT
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#define MZAP_MAX_BLKSZ (1 << MZAP_MAX_BLKSHIFT)
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typedef struct mzap_ent_phys {
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uint64_t mze_value;
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uint32_t mze_cd;
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uint16_t mze_pad; /* in case we want to chain them someday */
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char mze_name[MZAP_NAME_LEN];
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} mzap_ent_phys_t;
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typedef struct mzap_phys {
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uint64_t mz_block_type; /* ZBT_MICRO */
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uint64_t mz_salt;
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uint64_t mz_pad[6];
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mzap_ent_phys_t mz_chunk[1];
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/* actually variable size depending on block size */
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} mzap_phys_t;
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/*
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* The (fat) zap is stored in one object. It is an array of
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* 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of:
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*
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* ptrtbl fits in first block:
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* [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ...
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*
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* ptrtbl too big for first block:
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* [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ...
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*
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*/
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#define ZBT_LEAF ((1ULL << 63) + 0)
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#define ZBT_HEADER ((1ULL << 63) + 1)
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#define ZBT_MICRO ((1ULL << 63) + 3)
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/* any other values are ptrtbl blocks */
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/*
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* the embedded pointer table takes up half a block:
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* block size / entry size (2^3) / 2
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*/
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#define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1)
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/*
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* The embedded pointer table starts half-way through the block. Since
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* the pointer table itself is half the block, it starts at (64-bit)
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* word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)).
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*/
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#define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \
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((uint64_t *)(zap)->zap_f.zap_phys) \
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[(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))]
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/*
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* TAKE NOTE:
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* If zap_phys_t is modified, zap_byteswap() must be modified.
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*/
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typedef struct zap_phys {
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uint64_t zap_block_type; /* ZBT_HEADER */
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uint64_t zap_magic; /* ZAP_MAGIC */
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struct zap_table_phys {
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uint64_t zt_blk; /* starting block number */
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uint64_t zt_numblks; /* number of blocks */
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uint64_t zt_shift; /* bits to index it */
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uint64_t zt_nextblk; /* next (larger) copy start block */
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uint64_t zt_blks_copied; /* number source blocks copied */
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} zap_ptrtbl;
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uint64_t zap_freeblk; /* the next free block */
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uint64_t zap_num_leafs; /* number of leafs */
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uint64_t zap_num_entries; /* number of entries */
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uint64_t zap_salt; /* salt to stir into hash function */
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uint64_t zap_normflags; /* flags for u8_textprep_str() */
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uint64_t zap_flags; /* zap_flag_t */
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/*
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* This structure is followed by padding, and then the embedded
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* pointer table. The embedded pointer table takes up second
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* half of the block. It is accessed using the
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* ZAP_EMBEDDED_PTRTBL_ENT() macro.
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*/
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} zap_phys_t;
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#endif /* _SYS_ZAP_IMPL_H */
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