1*4882a593Smuzhiyun // SPDX-License-Identifier: Zlib
2*4882a593Smuzhiyun #ifndef DFLTCC_UTIL_H
3*4882a593Smuzhiyun #define DFLTCC_UTIL_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/zutil.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun /*
8*4882a593Smuzhiyun * C wrapper for the DEFLATE CONVERSION CALL instruction.
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun typedef enum {
11*4882a593Smuzhiyun DFLTCC_CC_OK = 0,
12*4882a593Smuzhiyun DFLTCC_CC_OP1_TOO_SHORT = 1,
13*4882a593Smuzhiyun DFLTCC_CC_OP2_TOO_SHORT = 2,
14*4882a593Smuzhiyun DFLTCC_CC_OP2_CORRUPT = 2,
15*4882a593Smuzhiyun DFLTCC_CC_AGAIN = 3,
16*4882a593Smuzhiyun } dfltcc_cc;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define DFLTCC_QAF 0
19*4882a593Smuzhiyun #define DFLTCC_GDHT 1
20*4882a593Smuzhiyun #define DFLTCC_CMPR 2
21*4882a593Smuzhiyun #define DFLTCC_XPND 4
22*4882a593Smuzhiyun #define HBT_CIRCULAR (1 << 7)
23*4882a593Smuzhiyun #define HB_BITS 15
24*4882a593Smuzhiyun #define HB_SIZE (1 << HB_BITS)
25*4882a593Smuzhiyun
dfltcc(int fn,void * param,Byte ** op1,size_t * len1,const Byte ** op2,size_t * len2,void * hist)26*4882a593Smuzhiyun static inline dfltcc_cc dfltcc(
27*4882a593Smuzhiyun int fn,
28*4882a593Smuzhiyun void *param,
29*4882a593Smuzhiyun Byte **op1,
30*4882a593Smuzhiyun size_t *len1,
31*4882a593Smuzhiyun const Byte **op2,
32*4882a593Smuzhiyun size_t *len2,
33*4882a593Smuzhiyun void *hist
34*4882a593Smuzhiyun )
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun Byte *t2 = op1 ? *op1 : NULL;
37*4882a593Smuzhiyun size_t t3 = len1 ? *len1 : 0;
38*4882a593Smuzhiyun const Byte *t4 = op2 ? *op2 : NULL;
39*4882a593Smuzhiyun size_t t5 = len2 ? *len2 : 0;
40*4882a593Smuzhiyun register int r0 __asm__("r0") = fn;
41*4882a593Smuzhiyun register void *r1 __asm__("r1") = param;
42*4882a593Smuzhiyun register Byte *r2 __asm__("r2") = t2;
43*4882a593Smuzhiyun register size_t r3 __asm__("r3") = t3;
44*4882a593Smuzhiyun register const Byte *r4 __asm__("r4") = t4;
45*4882a593Smuzhiyun register size_t r5 __asm__("r5") = t5;
46*4882a593Smuzhiyun int cc;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun __asm__ volatile(
49*4882a593Smuzhiyun ".insn rrf,0xb9390000,%[r2],%[r4],%[hist],0\n"
50*4882a593Smuzhiyun "ipm %[cc]\n"
51*4882a593Smuzhiyun : [r2] "+r" (r2)
52*4882a593Smuzhiyun , [r3] "+r" (r3)
53*4882a593Smuzhiyun , [r4] "+r" (r4)
54*4882a593Smuzhiyun , [r5] "+r" (r5)
55*4882a593Smuzhiyun , [cc] "=r" (cc)
56*4882a593Smuzhiyun : [r0] "r" (r0)
57*4882a593Smuzhiyun , [r1] "r" (r1)
58*4882a593Smuzhiyun , [hist] "r" (hist)
59*4882a593Smuzhiyun : "cc", "memory");
60*4882a593Smuzhiyun t2 = r2; t3 = r3; t4 = r4; t5 = r5;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun if (op1)
63*4882a593Smuzhiyun *op1 = t2;
64*4882a593Smuzhiyun if (len1)
65*4882a593Smuzhiyun *len1 = t3;
66*4882a593Smuzhiyun if (op2)
67*4882a593Smuzhiyun *op2 = t4;
68*4882a593Smuzhiyun if (len2)
69*4882a593Smuzhiyun *len2 = t5;
70*4882a593Smuzhiyun return (cc >> 28) & 3;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
is_bit_set(const char * bits,int n)73*4882a593Smuzhiyun static inline int is_bit_set(
74*4882a593Smuzhiyun const char *bits,
75*4882a593Smuzhiyun int n
76*4882a593Smuzhiyun )
77*4882a593Smuzhiyun {
78*4882a593Smuzhiyun return bits[n / 8] & (1 << (7 - (n % 8)));
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
turn_bit_off(char * bits,int n)81*4882a593Smuzhiyun static inline void turn_bit_off(
82*4882a593Smuzhiyun char *bits,
83*4882a593Smuzhiyun int n
84*4882a593Smuzhiyun )
85*4882a593Smuzhiyun {
86*4882a593Smuzhiyun bits[n / 8] &= ~(1 << (7 - (n % 8)));
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
dfltcc_are_params_ok(int level,uInt window_bits,int strategy,uLong level_mask)89*4882a593Smuzhiyun static inline int dfltcc_are_params_ok(
90*4882a593Smuzhiyun int level,
91*4882a593Smuzhiyun uInt window_bits,
92*4882a593Smuzhiyun int strategy,
93*4882a593Smuzhiyun uLong level_mask
94*4882a593Smuzhiyun )
95*4882a593Smuzhiyun {
96*4882a593Smuzhiyun return (level_mask & (1 << level)) != 0 &&
97*4882a593Smuzhiyun (window_bits == HB_BITS) &&
98*4882a593Smuzhiyun (strategy == Z_DEFAULT_STRATEGY);
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun char *oesc_msg(char *buf, int oesc);
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun #endif /* DFLTCC_UTIL_H */
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