Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
116 lines
2.3 KiB
C
116 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* CRC32 and CRC32C using LoongArch crc* instructions
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*
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* Module based on mips/crypto/crc32-mips.c
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*
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* Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
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* Copyright (C) 2018 MIPS Tech, LLC
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* Copyright (C) 2020-2023 Loongson Technology Corporation Limited
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*/
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#include <asm/cpu-features.h>
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#include <linux/unaligned.h>
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#define _CRC32(crc, value, size, type) \
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do { \
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__asm__ __volatile__( \
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#type ".w." #size ".w" " %0, %1, %0\n\t"\
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: "+r" (crc) \
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: "r" (value) \
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: "memory"); \
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} while (0)
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#define CRC32(crc, value, size) _CRC32(crc, value, size, crc)
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#define CRC32C(crc, value, size) _CRC32(crc, value, size, crcc)
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32);
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static inline u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
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{
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if (!static_branch_likely(&have_crc32))
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return crc32_le_base(crc, p, len);
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while (len >= sizeof(u64)) {
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u64 value = get_unaligned_le64(p);
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CRC32(crc, value, d);
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p += sizeof(u64);
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len -= sizeof(u64);
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}
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if (len & sizeof(u32)) {
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u32 value = get_unaligned_le32(p);
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CRC32(crc, value, w);
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p += sizeof(u32);
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}
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if (len & sizeof(u16)) {
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u16 value = get_unaligned_le16(p);
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CRC32(crc, value, h);
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p += sizeof(u16);
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}
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if (len & sizeof(u8)) {
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u8 value = *p++;
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CRC32(crc, value, b);
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}
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return crc;
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}
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static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
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{
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if (!static_branch_likely(&have_crc32))
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return crc32c_base(crc, p, len);
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while (len >= sizeof(u64)) {
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u64 value = get_unaligned_le64(p);
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CRC32C(crc, value, d);
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p += sizeof(u64);
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len -= sizeof(u64);
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}
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if (len & sizeof(u32)) {
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u32 value = get_unaligned_le32(p);
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CRC32C(crc, value, w);
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p += sizeof(u32);
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}
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if (len & sizeof(u16)) {
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u16 value = get_unaligned_le16(p);
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CRC32C(crc, value, h);
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p += sizeof(u16);
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}
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if (len & sizeof(u8)) {
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u8 value = *p++;
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CRC32C(crc, value, b);
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}
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return crc;
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}
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#define crc32_be_arch crc32_be_base /* not implemented on this arch */
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#define crc32_mod_init_arch crc32_mod_init_arch
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static void crc32_mod_init_arch(void)
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{
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if (cpu_has_crc32)
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static_branch_enable(&have_crc32);
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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_crc32))
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return CRC32_LE_OPTIMIZATION | CRC32C_OPTIMIZATION;
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return 0;
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}
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