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1// SPDX-License-Identifier: Zlib2#ifndef DFLTCC_H3#define DFLTCC_H4 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 104857615#define DFLTCC_FIRST_FHT_BLOCK_SIZE 409616#define DFLTCC_DHT_MIN_SAMPLE_SIZE 409617#define DFLTCC_RIBM 018 19#define DFLTCC_FACILITY 15120 21/*22 * Parameter Block for Query Available Functions.23 */24struct dfltcc_qaf_param {25 char fns[16];26 char reserved1[8];27 char fmts[2];28 char reserved2[6];29};30 31static_assert(sizeof(struct dfltcc_qaf_param) == 32);32 33#define DFLTCC_FMT0 034 35/*36 * Parameter Block for Generate Dynamic-Huffman Table, Compress and Expand.37 */38struct 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 Table76 Length */77 uint8_t reserved464[6];78 uint8_t cdht[288];79 uint8_t reserved[32];80 uint8_t csb[1152];81};82 83static_assert(offsetof(struct dfltcc_param_v0, csb) == 384);84static_assert(sizeof(struct dfltcc_param_v0) == 1536);85 86#define CVT_CRC32 087#define CVT_ADLER32 188#define HTT_FIXED 089#define HTT_DYNAMIC 190 91/*92 * Extension of inflate_state and deflate_state for DFLTCC.93 */94struct dfltcc_state {95 struct dfltcc_param_v0 param; /* Parameter block */96 struct dfltcc_qaf_param af; /* Available functions */97 char msg[64]; /* Buffer for strm->msg */98};99 100/*101 * Extension of inflate_state and deflate_state for DFLTCC.102 */103struct dfltcc_deflate_state {104 struct dfltcc_state common; /* Parameter block */105 uLong level_mask; /* Levels on which to use DFLTCC */106 uLong block_size; /* New block each X bytes */107 uLong block_threshold; /* New block after total_in > X */108 uLong dht_threshold; /* New block only if avail_in >= X */109};110 111#define ALIGN_UP(p, size) (__typeof__(p))(((uintptr_t)(p) + ((size) - 1)) & ~((size) - 1))112/* Resides right after inflate_state or deflate_state */113#define GET_DFLTCC_STATE(state) ((struct dfltcc_state *)((char *)(state) + ALIGN_UP(sizeof(*state), 8)))114 115void dfltcc_reset_state(struct dfltcc_state *dfltcc_state);116 117static inline int is_dfltcc_enabled(void)118{119return (zlib_dfltcc_support != ZLIB_DFLTCC_DISABLED &&120 test_facility(DFLTCC_FACILITY));121}122 123#define DEFLATE_DFLTCC_ENABLED() is_dfltcc_enabled()124 125#endif /* DFLTCC_H */126