353 lines
7.9 KiB
C
353 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions
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*
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* Module based on arm64/crypto/crc32-arm.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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*/
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#include <linux/cpufeature.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <asm/mipsregs.h>
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#include <asm/unaligned.h>
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#include <crypto/internal/hash.h>
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enum crc_op_size {
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b, h, w, d,
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};
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enum crc_type {
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crc32,
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crc32c,
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};
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#ifndef TOOLCHAIN_SUPPORTS_CRC
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#define _ASM_SET_CRC(OP, SZ, TYPE) \
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_ASM_MACRO_3R(OP, rt, rs, rt2, \
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".ifnc \\rt, \\rt2\n\t" \
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".error \"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \
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".endif\n\t" \
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_ASM_INSN_IF_MIPS(0x7c00000f | (__rt << 16) | (__rs << 21) | \
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((SZ) << 6) | ((TYPE) << 8)) \
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_ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) | \
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((SZ) << 14) | ((TYPE) << 3)))
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#define _ASM_UNSET_CRC(op, SZ, TYPE) ".purgem " #op "\n\t"
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#else /* !TOOLCHAIN_SUPPORTS_CRC */
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#define _ASM_SET_CRC(op, SZ, TYPE) ".set\tcrc\n\t"
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#define _ASM_UNSET_CRC(op, SZ, TYPE)
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#endif
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#define __CRC32(crc, value, op, SZ, TYPE) \
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do { \
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__asm__ __volatile__( \
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".set push\n\t" \
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_ASM_SET_CRC(op, SZ, TYPE) \
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#op " %0, %1, %0\n\t" \
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_ASM_UNSET_CRC(op, SZ, TYPE) \
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".set pop" \
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: "+r" (crc) \
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: "r" (value)); \
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} while (0)
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#define _CRC32_crc32b(crc, value) __CRC32(crc, value, crc32b, 0, 0)
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#define _CRC32_crc32h(crc, value) __CRC32(crc, value, crc32h, 1, 0)
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#define _CRC32_crc32w(crc, value) __CRC32(crc, value, crc32w, 2, 0)
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#define _CRC32_crc32d(crc, value) __CRC32(crc, value, crc32d, 3, 0)
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#define _CRC32_crc32cb(crc, value) __CRC32(crc, value, crc32cb, 0, 1)
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#define _CRC32_crc32ch(crc, value) __CRC32(crc, value, crc32ch, 1, 1)
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#define _CRC32_crc32cw(crc, value) __CRC32(crc, value, crc32cw, 2, 1)
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#define _CRC32_crc32cd(crc, value) __CRC32(crc, value, crc32cd, 3, 1)
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#define _CRC32(crc, value, size, op) \
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_CRC32_##op##size(crc, value)
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#define CRC32(crc, value, size) \
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_CRC32(crc, value, size, crc32)
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#define CRC32C(crc, value, size) \
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_CRC32(crc, value, size, crc32c)
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static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
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{
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u32 crc = crc_;
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#ifdef CONFIG_64BIT
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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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#else /* !CONFIG_64BIT */
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while (len >= sizeof(u32)) {
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#endif
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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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len -= 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 u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
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{
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u32 crc = crc_;
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#ifdef CONFIG_64BIT
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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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#else /* !CONFIG_64BIT */
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while (len >= sizeof(u32)) {
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#endif
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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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len -= 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 CHKSUM_BLOCK_SIZE 1
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#define CHKSUM_DIGEST_SIZE 4
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struct chksum_ctx {
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u32 key;
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};
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struct chksum_desc_ctx {
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u32 crc;
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};
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static int chksum_init(struct shash_desc *desc)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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ctx->crc = mctx->key;
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return 0;
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}
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/*
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* Setting the seed allows arbitrary accumulators and flexible XOR policy
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* If your algorithm starts with ~0, then XOR with ~0 before you set
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* the seed.
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*/
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static int chksum_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
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if (keylen != sizeof(mctx->key))
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return -EINVAL;
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mctx->key = get_unaligned_le32(key);
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return 0;
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}
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static int chksum_update(struct shash_desc *desc, const u8 *data,
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unsigned int length)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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ctx->crc = crc32_mips_le_hw(ctx->crc, data, length);
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return 0;
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}
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static int chksumc_update(struct shash_desc *desc, const u8 *data,
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unsigned int length)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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ctx->crc = crc32c_mips_le_hw(ctx->crc, data, length);
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return 0;
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}
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static int chksum_final(struct shash_desc *desc, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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put_unaligned_le32(ctx->crc, out);
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return 0;
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}
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static int chksumc_final(struct shash_desc *desc, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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put_unaligned_le32(~ctx->crc, out);
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return 0;
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}
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static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
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{
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put_unaligned_le32(crc32_mips_le_hw(crc, data, len), out);
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return 0;
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}
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static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
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{
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put_unaligned_le32(~crc32c_mips_le_hw(crc, data, len), out);
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return 0;
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}
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static int chksum_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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return __chksum_finup(ctx->crc, data, len, out);
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}
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static int chksumc_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
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return __chksumc_finup(ctx->crc, data, len, out);
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}
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static int chksum_digest(struct shash_desc *desc, const u8 *data,
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unsigned int length, u8 *out)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
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return __chksum_finup(mctx->key, data, length, out);
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}
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static int chksumc_digest(struct shash_desc *desc, const u8 *data,
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unsigned int length, u8 *out)
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{
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struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
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return __chksumc_finup(mctx->key, data, length, out);
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}
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static int chksum_cra_init(struct crypto_tfm *tfm)
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{
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struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
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mctx->key = ~0;
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return 0;
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}
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static struct shash_alg crc32_alg = {
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.digestsize = CHKSUM_DIGEST_SIZE,
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.setkey = chksum_setkey,
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.init = chksum_init,
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.update = chksum_update,
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.final = chksum_final,
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.finup = chksum_finup,
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.digest = chksum_digest,
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.descsize = sizeof(struct chksum_desc_ctx),
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.base = {
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.cra_name = "crc32",
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.cra_driver_name = "crc32-mips-hw",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
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.cra_blocksize = CHKSUM_BLOCK_SIZE,
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.cra_alignmask = 0,
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.cra_ctxsize = sizeof(struct chksum_ctx),
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.cra_module = THIS_MODULE,
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.cra_init = chksum_cra_init,
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}
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};
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static struct shash_alg crc32c_alg = {
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.digestsize = CHKSUM_DIGEST_SIZE,
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.setkey = chksum_setkey,
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.init = chksum_init,
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.update = chksumc_update,
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.final = chksumc_final,
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.finup = chksumc_finup,
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.digest = chksumc_digest,
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.descsize = sizeof(struct chksum_desc_ctx),
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.base = {
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.cra_name = "crc32c",
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.cra_driver_name = "crc32c-mips-hw",
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.cra_priority = 300,
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
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.cra_blocksize = CHKSUM_BLOCK_SIZE,
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.cra_alignmask = 0,
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.cra_ctxsize = sizeof(struct chksum_ctx),
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.cra_module = THIS_MODULE,
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.cra_init = chksum_cra_init,
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}
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};
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static int __init crc32_mod_init(void)
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{
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int err;
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err = crypto_register_shash(&crc32_alg);
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if (err)
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return err;
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err = crypto_register_shash(&crc32c_alg);
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if (err) {
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crypto_unregister_shash(&crc32_alg);
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return err;
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}
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return 0;
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}
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static void __exit crc32_mod_exit(void)
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{
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crypto_unregister_shash(&crc32_alg);
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crypto_unregister_shash(&crc32c_alg);
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}
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MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com");
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MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions");
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MODULE_LICENSE("GPL v2");
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module_cpu_feature_match(MIPS_CRC32, crc32_mod_init);
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module_exit(crc32_mod_exit);
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