lib/lzo/lzodefs.h

Source file repositories/reference/linux-study-clean/lib/lzo/lzodefs.h

File Facts

System
Linux kernel
Corpus path
lib/lzo/lzodefs.h
Extension
.h
Size
1864 bytes
Lines
72
Domain
Kernel Services
Bucket
lib
Inferred role
Kernel Services: implementation source
Status
source implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

#define LZO_VERSION 1

#define COPY4(dst, src)	\
		put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
#if defined(CONFIG_X86_64) || defined(CONFIG_ARM64)
#define COPY8(dst, src)	\
		put_unaligned(get_unaligned((const u64 *)(src)), (u64 *)(dst))
#else
#define COPY8(dst, src)	\
		COPY4(dst, src); COPY4((dst) + 4, (src) + 4)
#endif

#if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN)
#error "conflicting endian definitions"
#elif defined(CONFIG_X86_64) || defined(CONFIG_ARM64)
#define LZO_USE_CTZ64	1
#define LZO_USE_CTZ32	1
#define LZO_FAST_64BIT_MEMORY_ACCESS
#elif defined(CONFIG_X86) || defined(CONFIG_PPC)
#define LZO_USE_CTZ32	1
#elif defined(CONFIG_ARM) && (__LINUX_ARM_ARCH__ >= 5)
#define LZO_USE_CTZ32	1
#endif

#define M1_MAX_OFFSET	0x0400
#define M2_MAX_OFFSET	0x0800
#define M3_MAX_OFFSET	0x4000
#define M4_MAX_OFFSET_V0	0xbfff
#define M4_MAX_OFFSET_V1	0xbffe

#define M1_MIN_LEN	2
#define M1_MAX_LEN	2
#define M2_MIN_LEN	3
#define M2_MAX_LEN	8
#define M3_MIN_LEN	3
#define M3_MAX_LEN	33
#define M4_MIN_LEN	3
#define M4_MAX_LEN	9

#define M1_MARKER	0
#define M2_MARKER	64
#define M3_MARKER	32
#define M4_MARKER	16

#define MIN_ZERO_RUN_LENGTH	4
#define MAX_ZERO_RUN_LENGTH	(2047 + MIN_ZERO_RUN_LENGTH)

#define lzo_dict_t      unsigned short
#define D_BITS		13
#define D_SIZE		(1u << D_BITS)
#define D_MASK		(D_SIZE - 1)
#define D_HIGH		((D_MASK >> 1) + 1)

Annotation

Implementation Notes