lib/crc/arm64/crc32.h

Source file repositories/reference/linux-study-clean/lib/crc/arm64/crc32.h

File Facts

System
Linux kernel
Corpus path
lib/crc/arm64/crc32.h
Extension
.h
Size
2168 bytes
Lines
86
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

likely(may_use_simd())) {
		scoped_ksimd()
			crc = crc32_le_arm64_4way(crc, p, len);

		p += round_down(len, 64);
		len %= 64;

		if (!len)
			return crc;
	}

	return crc32_le_arm64(crc, p, len);
}

static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
{
	if (!alternative_has_cap_likely(ARM64_HAS_CRC32))
		return crc32c_base(crc, p, len);

	if (len >= min_len && cpu_have_named_feature(PMULL) &&
	    likely(may_use_simd())) {
		scoped_ksimd()
			crc = crc32c_le_arm64_4way(crc, p, len);

		p += round_down(len, 64);
		len %= 64;

		if (!len)
			return crc;
	}

	return crc32c_le_arm64(crc, p, len);
}

static inline u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
{
	if (!alternative_has_cap_likely(ARM64_HAS_CRC32))
		return crc32_be_base(crc, p, len);

	if (len >= min_len && cpu_have_named_feature(PMULL) &&
	    likely(may_use_simd())) {
		scoped_ksimd()
			crc = crc32_be_arm64_4way(crc, p, len);

		p += round_down(len, 64);
		len %= 64;

		if (!len)
			return crc;
	}

	return crc32_be_arm64(crc, p, len);
}

static inline u32 crc32_optimizations_arch(void)
{
	if (alternative_has_cap_likely(ARM64_HAS_CRC32))
		return CRC32_LE_OPTIMIZATION |
		       CRC32_BE_OPTIMIZATION |
		       CRC32C_OPTIMIZATION;
	return 0;
}

Annotation

Implementation Notes