lib/crypto/s390/sha256.h

Source file repositories/reference/linux-study-clean/lib/crypto/s390/sha256.h

File Facts

System
Linux kernel
Corpus path
lib/crypto/s390/sha256.h
Extension
.h
Size
809 bytes
Lines
29
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

#include <asm/cpacf.h>
#include <linux/cpufeature.h>

static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_cpacf_sha256);

static void sha256_blocks(struct sha256_block_state *state,
			  const u8 *data, size_t nblocks)
{
	if (static_branch_likely(&have_cpacf_sha256))
		cpacf_kimd(CPACF_KIMD_SHA_256, state, data,
			   nblocks * SHA256_BLOCK_SIZE);
	else
		sha256_blocks_generic(state, data, nblocks);
}

#define sha256_mod_init_arch sha256_mod_init_arch
static void sha256_mod_init_arch(void)
{
	if (cpu_have_feature(S390_CPU_FEATURE_MSA) &&
	    cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_256))
		static_branch_enable(&have_cpacf_sha256);
}

Annotation

Implementation Notes