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 | */ |
10 | typedef 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 | |
26 | static 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 | |
73 | static 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 | |
81 | static inline void turn_bit_off( |
82 | char *bits, |
83 | int n |
84 | ) |
85 | { |
86 | bits[n / 8] &= ~(1 << (7 - (n % 8))); |
87 | } |
88 | |
89 | static 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 | |
101 | char *oesc_msg(char *buf, int oesc); |
102 | |
103 | #endif /* DFLTCC_UTIL_H */ |
104 | |