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