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// SPDX-License-Identifier: GPL-2.0
/*
* CRC32 and CRC32C using LoongArch crc* instructions
*
* Module based on mips/crypto/crc32-mips.c
*
* Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
* Copyright (C) 2018 MIPS Tech, LLC
* Copyright (C) 2020-2023 Loongson Technology Corporation Limited
*/
#include <asm/cpu-features.h>
#include <linux/unaligned.h>
#define _CRC32(crc, value, size, type) \
do { \
__asm__ __volatile__( \
#type ".w." #size ".w" " %0, %1, %0\n\t"\
: "+r" (crc) \
: "r" (value) \
: "memory"); \
} while (0)
#define CRC32(crc, value, size) _CRC32(crc, value, size, crc)
#define CRC32C(crc, value, size) _CRC32(crc, value, size, crcc)
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_crc32);
static inline u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
{
if (!static_branch_likely(&have_crc32))
return crc32_le_base(crc, p, len);
while (len >= sizeof(u64)) {
u64 value = get_unaligned_le64(p);
CRC32(crc, value, d);
p += sizeof(u64);
len -= sizeof(u64);
}
if (len & sizeof(u32)) {
u32 value = get_unaligned_le32(p);
CRC32(crc, value, w);
p += sizeof(u32);
}
if (len & sizeof(u16)) {
u16 value = get_unaligned_le16(p);
CRC32(crc, value, h);
p += sizeof(u16);
}
if (len & sizeof(u8)) {
u8 value = *p++;
CRC32(crc, value, b);
}
return crc;
}
static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
{
if (!static_branch_likely(&have_crc32))
return crc32c_base(crc, p, len);
while (len >= sizeof(u64)) {
u64 value = get_unaligned_le64(p);
CRC32C(crc, value, d);
p += sizeof(u64);
len -= sizeof(u64);
}
if (len & sizeof(u32)) {
u32 value = get_unaligned_le32(p);
CRC32C(crc, value, w);
p += sizeof(u32);
}
if (len & sizeof(u16)) {
u16 value = get_unaligned_le16(p);
CRC32C(crc, value, h);
p += sizeof(u16);
}
if (len & sizeof(u8)) {
u8 value = *p++;
CRC32C(crc, value, b);
}
return crc;
}
#define crc32_be_arch crc32_be_base /* not implemented on this arch */
#define crc32_mod_init_arch crc32_mod_init_arch
static inline void crc32_mod_init_arch(void)
{
if (cpu_has_crc32)
static_branch_enable(&have_crc32);
}
static inline u32 crc32_optimizations_arch(void)
{
if (static_key_enabled(&have_crc32))
return CRC32_LE_OPTIMIZATION | CRC32C_OPTIMIZATION;
return 0;
}
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