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// SPDX-License-Identifier: GPL-2.0
/*
* crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions
*
* Module based on arm64/crypto/crc32-arm.c
*
* Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
* Copyright (C) 2018 MIPS Tech, LLC
*/
#include <linux/cpufeature.h>
#include <asm/mipsregs.h>
#include <linux/unaligned.h>
#ifndef TOOLCHAIN_SUPPORTS_CRC
#define _ASM_SET_CRC(OP, SZ, TYPE) \
_ASM_MACRO_3R(OP, rt, rs, rt2, \
".ifnc \\rt, \\rt2\n\t" \
".error \"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \
".endif\n\t" \
_ASM_INSN_IF_MIPS(0x7c00000f | (__rt << 16) | (__rs << 21) | \
((SZ) << 6) | ((TYPE) << 8)) \
_ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) | \
((SZ) << 14) | ((TYPE) << 3)))
#define _ASM_UNSET_CRC(op, SZ, TYPE) ".purgem " #op "\n\t"
#else /* !TOOLCHAIN_SUPPORTS_CRC */
#define _ASM_SET_CRC(op, SZ, TYPE) ".set\tcrc\n\t"
#define _ASM_UNSET_CRC(op, SZ, TYPE)
#endif
#define __CRC32(crc, value, op, SZ, TYPE) \
do { \
__asm__ __volatile__( \
".set push\n\t" \
_ASM_SET_CRC(op, SZ, TYPE) \
#op " %0, %1, %0\n\t" \
_ASM_UNSET_CRC(op, SZ, TYPE) \
".set pop" \
: "+r" (crc) \
: "r" (value)); \
} while (0)
#define _CRC32_crc32b(crc, value) __CRC32(crc, value, crc32b, 0, 0)
#define _CRC32_crc32h(crc, value) __CRC32(crc, value, crc32h, 1, 0)
#define _CRC32_crc32w(crc, value) __CRC32(crc, value, crc32w, 2, 0)
#define _CRC32_crc32d(crc, value) __CRC32(crc, value, crc32d, 3, 0)
#define _CRC32_crc32cb(crc, value) __CRC32(crc, value, crc32cb, 0, 1)
#define _CRC32_crc32ch(crc, value) __CRC32(crc, value, crc32ch, 1, 1)
#define _CRC32_crc32cw(crc, value) __CRC32(crc, value, crc32cw, 2, 1)
#define _CRC32_crc32cd(crc, value) __CRC32(crc, value, crc32cd, 3, 1)
#define _CRC32(crc, value, size, op) \
_CRC32_##op##size(crc, value)
#define CRC32(crc, value, size) \
_CRC32(crc, value, size, crc32)
#define CRC32C(crc, value, size) \
_CRC32(crc, value, size, crc32c)
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);
if (IS_ENABLED(CONFIG_64BIT)) {
for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) {
u64 value = get_unaligned_le64(p);
CRC32(crc, value, d);
}
if (len & sizeof(u32)) {
u32 value = get_unaligned_le32(p);
CRC32(crc, value, w);
p += sizeof(u32);
}
} else {
for (; len >= sizeof(u32); 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);
if (IS_ENABLED(CONFIG_64BIT)) {
for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) {
u64 value = get_unaligned_le64(p);
CRC32C(crc, value, d);
}
if (len & sizeof(u32)) {
u32 value = get_unaligned_le32(p);
CRC32C(crc, value, w);
p += sizeof(u32);
}
} else {
for (; len >= sizeof(u32); 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 void crc32_mod_init_arch(void)
{
if (cpu_have_feature(cpu_feature(MIPS_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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