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// SPDX-License-Identifier: GPL-2.0-only
/*
* SHA-256 accelerated using the sparc64 sha256 opcodes
*
* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <asm/elf.h>
#include <asm/opcodes.h>
#include <asm/pstate.h>
#include <crypto/internal/sha2.h>
#include <linux/kernel.h>
#include <linux/module.h>
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha256_opcodes);
asmlinkage void sha256_sparc64_transform(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks);
void sha256_blocks_arch(u32 state[SHA256_STATE_WORDS],
const u8 *data, size_t nblocks)
{
if (static_branch_likely(&have_sha256_opcodes))
sha256_sparc64_transform(state, data, nblocks);
else
sha256_blocks_generic(state, data, nblocks);
}
EXPORT_SYMBOL_GPL(sha256_blocks_arch);
bool sha256_is_arch_optimized(void)
{
return static_key_enabled(&have_sha256_opcodes);
}
EXPORT_SYMBOL_GPL(sha256_is_arch_optimized);
static int __init sha256_sparc64_mod_init(void)
{
unsigned long cfr;
if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
return 0;
__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
if (!(cfr & CFR_SHA256))
return 0;
static_branch_enable(&have_sha256_opcodes);
pr_info("Using sparc64 sha256 opcode optimized SHA-256/SHA-224 implementation\n");
return 0;
}
subsys_initcall(sha256_sparc64_mod_init);
static void __exit sha256_sparc64_mod_exit(void)
{
}
module_exit(sha256_sparc64_mod_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA-256 accelerated using the sparc64 sha256 opcodes");
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