1// SPDX-License-Identifier: Zlib
2#ifndef DFLTCC_UTIL_H
3#define DFLTCC_UTIL_H
4
5#include <linux/zutil.h>
6
7/*
8 * C wrapper for the DEFLATE CONVERSION CALL instruction.
9 */
10typedef enum {
11 DFLTCC_CC_OK = 0,
12 DFLTCC_CC_OP1_TOO_SHORT = 1,
13 DFLTCC_CC_OP2_TOO_SHORT = 2,
14 DFLTCC_CC_OP2_CORRUPT = 2,
15 DFLTCC_CC_AGAIN = 3,
16} dfltcc_cc;
17
18#define DFLTCC_QAF 0
19#define DFLTCC_GDHT 1
20#define DFLTCC_CMPR 2
21#define DFLTCC_XPND 4
22#define HBT_CIRCULAR (1 << 7)
23#define HB_BITS 15
24#define HB_SIZE (1 << HB_BITS)
25
26static inline dfltcc_cc dfltcc(
27 int fn,
28 void *param,
29 Byte **op1,
30 size_t *len1,
31 const Byte **op2,
32 size_t *len2,
33 void *hist
34)
35{
36 Byte *t2 = op1 ? *op1 : NULL;
37 size_t t3 = len1 ? *len1 : 0;
38 const Byte *t4 = op2 ? *op2 : NULL;
39 size_t t5 = len2 ? *len2 : 0;
40 register int r0 __asm__("r0") = fn;
41 register void *r1 __asm__("r1") = param;
42 register Byte *r2 __asm__("r2") = t2;
43 register size_t r3 __asm__("r3") = t3;
44 register const Byte *r4 __asm__("r4") = t4;
45 register size_t r5 __asm__("r5") = t5;
46 int cc;
47
48 __asm__ volatile(
49 ".insn rrf,0xb9390000,%[r2],%[r4],%[hist],0\n"
50 "ipm %[cc]\n"
51 : [r2] "+r" (r2)
52 , [r3] "+r" (r3)
53 , [r4] "+r" (r4)
54 , [r5] "+r" (r5)
55 , [cc] "=r" (cc)
56 : [r0] "r" (r0)
57 , [r1] "r" (r1)
58 , [hist] "r" (hist)
59 : "cc", "memory");
60 t2 = r2; t3 = r3; t4 = r4; t5 = r5;
61
62 if (op1)
63 *op1 = t2;
64 if (len1)
65 *len1 = t3;
66 if (op2)
67 *op2 = t4;
68 if (len2)
69 *len2 = t5;
70 return (cc >> 28) & 3;
71}
72
73static inline int is_bit_set(
74 const char *bits,
75 int n
76)
77{
78 return bits[n / 8] & (1 << (7 - (n % 8)));
79}
80
81static inline void turn_bit_off(
82 char *bits,
83 int n
84)
85{
86 bits[n / 8] &= ~(1 << (7 - (n % 8)));
87}
88
89static inline int dfltcc_are_params_ok(
90 int level,
91 uInt window_bits,
92 int strategy,
93 uLong level_mask
94)
95{
96 return (level_mask & (1 << level)) != 0 &&
97 (window_bits == HB_BITS) &&
98 (strategy == Z_DEFAULT_STRATEGY);
99}
100
101char *oesc_msg(char *buf, int oesc);
102
103#endif /* DFLTCC_UTIL_H */
104

source code of linux/lib/zlib_dfltcc/dfltcc_util.h