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9b2d720e8a
Move the sparc-optimized CRC code from arch/sparc/lib/crc* into its new location in lib/crc/sparc/, and wire it up in the new way. This new way of organizing the CRC code eliminates the need to artificially split the code for each CRC variant into separate arch and generic modules, enabling better inlining and dead code elimination. For more details, see "lib/crc: Prepare for arch-optimized code in subdirs of lib/crc/". Reviewed-by: "Martin K. Petersen" <martin.petersen@oracle.com> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: "Jason A. Donenfeld" <Jason@zx2c4.com> Link: https://lore.kernel.org/r/20250607200454.73587-11-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* CRC32c (Castagnoli), sparc64 crc32c opcode accelerated
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*
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* This is based largely upon arch/x86/crypto/crc32c-intel.c
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*
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* Copyright (C) 2008 Intel Corporation
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* Authors: Austin Zhang <austin_zhang@linux.intel.com>
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* Kent Liu <kent.liu@intel.com>
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*/
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#include <asm/pstate.h>
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#include <asm/elf.h>
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32c_opcode);
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#define crc32_le_arch crc32_le_base /* not implemented on this arch */
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#define crc32_be_arch crc32_be_base /* not implemented on this arch */
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void crc32c_sparc64(u32 *crcp, const u64 *data, size_t len);
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static inline u32 crc32c_arch(u32 crc, const u8 *data, size_t len)
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{
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size_t n = -(uintptr_t)data & 7;
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if (!static_branch_likely(&have_crc32c_opcode))
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return crc32c_base(crc, data, len);
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if (n) {
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/* Data isn't 8-byte aligned. Align it. */
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n = min(n, len);
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crc = crc32c_base(crc, data, n);
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data += n;
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len -= n;
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}
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n = len & ~7U;
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if (n) {
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crc32c_sparc64(&crc, (const u64 *)data, n);
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data += n;
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len -= n;
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}
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if (len)
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crc = crc32c_base(crc, data, len);
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return crc;
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}
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#define crc32_mod_init_arch crc32_mod_init_arch
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static inline void crc32_mod_init_arch(void)
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{
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unsigned long cfr;
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if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
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return;
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__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
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if (!(cfr & CFR_CRC32C))
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return;
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static_branch_enable(&have_crc32c_opcode);
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pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
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}
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static inline u32 crc32_optimizations_arch(void)
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{
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if (static_key_enabled(&have_crc32c_opcode))
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return CRC32C_OPTIMIZATION;
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return 0;
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}
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