1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 config XZ_DEC 2 config XZ_DEC
3 tristate "XZ decompression support" 3 tristate "XZ decompression support"
4 select CRC32 4 select CRC32
5 help 5 help
6 LZMA2 compression algorithm and BCJ 6 LZMA2 compression algorithm and BCJ filters are supported using
7 the .xz file format as the container 7 the .xz file format as the container. For integrity checking,
8 CRC32 is supported. See Documentatio !! 8 CRC32 is supported. See Documentation/staging/xz.rst for more information.
9 information. <<
10 9
11 if XZ_DEC 10 if XZ_DEC
12 11
13 config XZ_DEC_X86 12 config XZ_DEC_X86
14 bool "x86 BCJ filter decoder" if EXPER 13 bool "x86 BCJ filter decoder" if EXPERT
15 default y 14 default y
16 select XZ_DEC_BCJ 15 select XZ_DEC_BCJ
17 16
18 config XZ_DEC_POWERPC 17 config XZ_DEC_POWERPC
19 bool "PowerPC BCJ filter decoder" if E 18 bool "PowerPC BCJ filter decoder" if EXPERT
20 default y 19 default y
21 select XZ_DEC_BCJ 20 select XZ_DEC_BCJ
22 21
23 config XZ_DEC_ARM 22 config XZ_DEC_ARM
24 bool "ARM BCJ filter decoder" if EXPER 23 bool "ARM BCJ filter decoder" if EXPERT
25 default y 24 default y
26 select XZ_DEC_BCJ 25 select XZ_DEC_BCJ
27 26
28 config XZ_DEC_ARMTHUMB 27 config XZ_DEC_ARMTHUMB
29 bool "ARM-Thumb BCJ filter decoder" if 28 bool "ARM-Thumb BCJ filter decoder" if EXPERT
30 default y 29 default y
31 select XZ_DEC_BCJ 30 select XZ_DEC_BCJ
32 31
33 config XZ_DEC_ARM64 <<
34 bool "ARM64 BCJ filter decoder" if EXP <<
35 default y <<
36 select XZ_DEC_BCJ <<
37 <<
38 config XZ_DEC_SPARC 32 config XZ_DEC_SPARC
39 bool "SPARC BCJ filter decoder" if EXP 33 bool "SPARC BCJ filter decoder" if EXPERT
40 default y <<
41 select XZ_DEC_BCJ <<
42 <<
43 config XZ_DEC_RISCV <<
44 bool "RISC-V BCJ filter decoder" if EX <<
45 default y 34 default y
46 select XZ_DEC_BCJ 35 select XZ_DEC_BCJ
47 36
48 config XZ_DEC_MICROLZMA 37 config XZ_DEC_MICROLZMA
49 bool "MicroLZMA decoder" 38 bool "MicroLZMA decoder"
50 default n 39 default n
51 help 40 help
52 MicroLZMA is a header format variant 41 MicroLZMA is a header format variant where the first byte
53 of a raw LZMA stream (without the en 42 of a raw LZMA stream (without the end of stream marker) has
54 been replaced with a bitwise-negatio 43 been replaced with a bitwise-negation of the lc/lp/pb
55 properties byte. MicroLZMA was creat 44 properties byte. MicroLZMA was created to be used in EROFS
56 but can be used by other things too 45 but can be used by other things too where wasting minimal
57 amount of space for headers is impor 46 amount of space for headers is important.
58 47
59 Unless you know that you need this, 48 Unless you know that you need this, say N.
60 49
61 endif 50 endif
62 51
63 config XZ_DEC_BCJ 52 config XZ_DEC_BCJ
64 bool 53 bool
65 default n 54 default n
66 55
67 config XZ_DEC_TEST 56 config XZ_DEC_TEST
68 tristate "XZ decompressor tester" 57 tristate "XZ decompressor tester"
69 default n 58 default n
70 depends on XZ_DEC 59 depends on XZ_DEC
71 help 60 help
72 This allows passing .xz files to the 61 This allows passing .xz files to the in-kernel XZ decoder via
73 a character special file. It calcula 62 a character special file. It calculates CRC32 of the decompressed
74 data and writes diagnostics to the s 63 data and writes diagnostics to the system log.
75 64
76 Unless you are developing the XZ dec 65 Unless you are developing the XZ decoder, you don't need this
77 and should say N. 66 and should say N.
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