1 | // SPDX-License-Identifier: Zlib |
2 | #ifndef DFLTCC_H |
3 | #define DFLTCC_H |
4 | |
5 | #include "../zlib_deflate/defutil.h" |
6 | #include <asm/facility.h> |
7 | #include <asm/setup.h> |
8 | |
9 | /* |
10 | * Tuning parameters. |
11 | */ |
12 | #define DFLTCC_LEVEL_MASK 0x2 /* DFLTCC compression for level 1 only */ |
13 | #define DFLTCC_LEVEL_MASK_DEBUG 0x3fe /* DFLTCC compression for all levels */ |
14 | #define DFLTCC_BLOCK_SIZE 1048576 |
15 | #define DFLTCC_FIRST_FHT_BLOCK_SIZE 4096 |
16 | #define DFLTCC_DHT_MIN_SAMPLE_SIZE 4096 |
17 | #define DFLTCC_RIBM 0 |
18 | |
19 | #define DFLTCC_FACILITY 151 |
20 | |
21 | /* |
22 | * Parameter Block for Query Available Functions. |
23 | */ |
24 | struct dfltcc_qaf_param { |
25 | char fns[16]; |
26 | char reserved1[8]; |
27 | char fmts[2]; |
28 | char reserved2[6]; |
29 | }; |
30 | |
31 | static_assert(sizeof(struct dfltcc_qaf_param) == 32); |
32 | |
33 | #define DFLTCC_FMT0 0 |
34 | |
35 | /* |
36 | * Parameter Block for Generate Dynamic-Huffman Table, Compress and Expand. |
37 | */ |
38 | struct dfltcc_param_v0 { |
39 | uint16_t pbvn; /* Parameter-Block-Version Number */ |
40 | uint8_t mvn; /* Model-Version Number */ |
41 | uint8_t ribm; /* Reserved for IBM use */ |
42 | unsigned reserved32 : 31; |
43 | unsigned cf : 1; /* Continuation Flag */ |
44 | uint8_t reserved64[8]; |
45 | unsigned nt : 1; /* New Task */ |
46 | unsigned reserved129 : 1; |
47 | unsigned cvt : 1; /* Check Value Type */ |
48 | unsigned reserved131 : 1; |
49 | unsigned htt : 1; /* Huffman-Table Type */ |
50 | unsigned bcf : 1; /* Block-Continuation Flag */ |
51 | unsigned bcc : 1; /* Block Closing Control */ |
52 | unsigned bhf : 1; /* Block Header Final */ |
53 | unsigned reserved136 : 1; |
54 | unsigned reserved137 : 1; |
55 | unsigned dhtgc : 1; /* DHT Generation Control */ |
56 | unsigned reserved139 : 5; |
57 | unsigned reserved144 : 5; |
58 | unsigned sbb : 3; /* Sub-Byte Boundary */ |
59 | uint8_t oesc; /* Operation-Ending-Supplemental Code */ |
60 | unsigned reserved160 : 12; |
61 | unsigned ifs : 4; /* Incomplete-Function Status */ |
62 | uint16_t ifl; /* Incomplete-Function Length */ |
63 | uint8_t reserved192[8]; |
64 | uint8_t reserved256[8]; |
65 | uint8_t reserved320[4]; |
66 | uint16_t hl; /* History Length */ |
67 | unsigned reserved368 : 1; |
68 | uint16_t ho : 15; /* History Offset */ |
69 | uint32_t cv; /* Check Value */ |
70 | unsigned eobs : 15; /* End-of-block Symbol */ |
71 | unsigned reserved431: 1; |
72 | uint8_t eobl : 4; /* End-of-block Length */ |
73 | unsigned reserved436 : 12; |
74 | unsigned reserved448 : 4; |
75 | uint16_t cdhtl : 12; /* Compressed-Dynamic-Huffman Table |
76 | Length */ |
77 | uint8_t reserved464[6]; |
78 | uint8_t cdht[288]; |
79 | uint8_t reserved[32]; |
80 | uint8_t csb[1152]; |
81 | }; |
82 | |
83 | static_assert(sizeof(struct dfltcc_param_v0) == 1536); |
84 | |
85 | #define CVT_CRC32 0 |
86 | #define CVT_ADLER32 1 |
87 | #define HTT_FIXED 0 |
88 | #define HTT_DYNAMIC 1 |
89 | |
90 | /* |
91 | * Extension of inflate_state and deflate_state for DFLTCC. |
92 | */ |
93 | struct dfltcc_state { |
94 | struct dfltcc_param_v0 param; /* Parameter block */ |
95 | struct dfltcc_qaf_param af; /* Available functions */ |
96 | char msg[64]; /* Buffer for strm->msg */ |
97 | }; |
98 | |
99 | /* |
100 | * Extension of inflate_state and deflate_state for DFLTCC. |
101 | */ |
102 | struct dfltcc_deflate_state { |
103 | struct dfltcc_state common; /* Parameter block */ |
104 | uLong level_mask; /* Levels on which to use DFLTCC */ |
105 | uLong block_size; /* New block each X bytes */ |
106 | uLong block_threshold; /* New block after total_in > X */ |
107 | uLong dht_threshold; /* New block only if avail_in >= X */ |
108 | }; |
109 | |
110 | #define ALIGN_UP(p, size) (__typeof__(p))(((uintptr_t)(p) + ((size) - 1)) & ~((size) - 1)) |
111 | /* Resides right after inflate_state or deflate_state */ |
112 | #define GET_DFLTCC_STATE(state) ((struct dfltcc_state *)((char *)(state) + ALIGN_UP(sizeof(*state), 8))) |
113 | |
114 | void dfltcc_reset_state(struct dfltcc_state *dfltcc_state); |
115 | |
116 | static inline int is_dfltcc_enabled(void) |
117 | { |
118 | return (zlib_dfltcc_support != ZLIB_DFLTCC_DISABLED && |
119 | test_facility(DFLTCC_FACILITY)); |
120 | } |
121 | |
122 | #define DEFLATE_DFLTCC_ENABLED() is_dfltcc_enabled() |
123 | |
124 | #endif /* DFLTCC_H */ |
125 | |