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// SPDX-License-Identifier: Zlib
#ifndef DFLTCC_H
#define DFLTCC_H
#include "../zlib_deflate/defutil.h"
#include <asm/facility.h>
#include <asm/setup.h>
/*
* Tuning parameters.
*/
#define DFLTCC_LEVEL_MASK 0x2 /* DFLTCC compression for level 1 only */
#define DFLTCC_LEVEL_MASK_DEBUG 0x3fe /* DFLTCC compression for all levels */
#define DFLTCC_BLOCK_SIZE 1048576
#define DFLTCC_FIRST_FHT_BLOCK_SIZE 4096
#define DFLTCC_DHT_MIN_SAMPLE_SIZE 4096
#define DFLTCC_RIBM 0
#define DFLTCC_FACILITY 151
/*
* Parameter Block for Query Available Functions.
*/
struct dfltcc_qaf_param {
char fns[16];
char reserved1[8];
char fmts[2];
char reserved2[6];
};
static_assert(sizeof(struct dfltcc_qaf_param) == 32);
#define DFLTCC_FMT0 0
/*
* Parameter Block for Generate Dynamic-Huffman Table, Compress and Expand.
*/
struct dfltcc_param_v0 {
uint16_t pbvn; /* Parameter-Block-Version Number */
uint8_t mvn; /* Model-Version Number */
uint8_t ribm; /* Reserved for IBM use */
unsigned reserved32 : 31;
unsigned cf : 1; /* Continuation Flag */
uint8_t reserved64[8];
unsigned nt : 1; /* New Task */
unsigned reserved129 : 1;
unsigned cvt : 1; /* Check Value Type */
unsigned reserved131 : 1;
unsigned htt : 1; /* Huffman-Table Type */
unsigned bcf : 1; /* Block-Continuation Flag */
unsigned bcc : 1; /* Block Closing Control */
unsigned bhf : 1; /* Block Header Final */
unsigned reserved136 : 1;
unsigned reserved137 : 1;
unsigned dhtgc : 1; /* DHT Generation Control */
unsigned reserved139 : 5;
unsigned reserved144 : 5;
unsigned sbb : 3; /* Sub-Byte Boundary */
uint8_t oesc; /* Operation-Ending-Supplemental Code */
unsigned reserved160 : 12;
unsigned ifs : 4; /* Incomplete-Function Status */
uint16_t ifl; /* Incomplete-Function Length */
uint8_t reserved192[8];
uint8_t reserved256[8];
uint8_t reserved320[4];
uint16_t hl; /* History Length */
unsigned reserved368 : 1;
uint16_t ho : 15; /* History Offset */
uint32_t cv; /* Check Value */
unsigned eobs : 15; /* End-of-block Symbol */
unsigned reserved431: 1;
uint8_t eobl : 4; /* End-of-block Length */
unsigned reserved436 : 12;
unsigned reserved448 : 4;
uint16_t cdhtl : 12; /* Compressed-Dynamic-Huffman Table
Length */
uint8_t reserved464[6];
uint8_t cdht[288];
uint8_t reserved[32];
uint8_t csb[1152];
};
static_assert(offsetof(struct dfltcc_param_v0, csb) == 384);
static_assert(sizeof(struct dfltcc_param_v0) == 1536);
#define CVT_CRC32 0
#define CVT_ADLER32 1
#define HTT_FIXED 0
#define HTT_DYNAMIC 1
/*
* Extension of inflate_state and deflate_state for DFLTCC.
*/
struct dfltcc_state {
struct dfltcc_param_v0 param; /* Parameter block */
struct dfltcc_qaf_param af; /* Available functions */
char msg[64]; /* Buffer for strm->msg */
};
/*
* Extension of inflate_state and deflate_state for DFLTCC.
*/
struct dfltcc_deflate_state {
struct dfltcc_state common; /* Parameter block */
uLong level_mask; /* Levels on which to use DFLTCC */
uLong block_size; /* New block each X bytes */
uLong block_threshold; /* New block after total_in > X */
uLong dht_threshold; /* New block only if avail_in >= X */
};
#define ALIGN_UP(p, size) (__typeof__(p))(((uintptr_t)(p) + ((size) - 1)) & ~((size) - 1))
/* Resides right after inflate_state or deflate_state */
#define GET_DFLTCC_STATE(state) ((struct dfltcc_state *)((char *)(state) + ALIGN_UP(sizeof(*state), 8)))
void dfltcc_reset_state(struct dfltcc_state *dfltcc_state);
static inline int is_dfltcc_enabled(void)
{
return (zlib_dfltcc_support != ZLIB_DFLTCC_DISABLED &&
test_facility(DFLTCC_FACILITY));
}
#define DEFLATE_DFLTCC_ENABLED() is_dfltcc_enabled()
#endif /* DFLTCC_H */
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