crypto: blowfish - add x86_64 assembly implementation

Patch adds x86_64 assembly implementation of blowfish. Two set of assembler
functions are provided. First set is regular 'one-block at time'
encrypt/decrypt functions. Second is 'four-block at time' functions that
gain performance increase on out-of-order CPUs. Performance of 4-way
functions should be equal to 1-way functions with in-order CPUs.

Summary of the tcrypt benchmarks:

Blowfish assembler vs blowfish C (256bit 8kb block ECB)
encrypt: 2.2x speed
decrypt: 2.3x speed

Blowfish assembler vs blowfish C (256bit 8kb block CBC)
encrypt: 1.12x speed
decrypt: 2.5x speed

Blowfish assembler vs blowfish C (256bit 8kb block CTR)
encrypt: 2.5x speed

Full output:
http://koti.mbnet.fi/axh/kernel/crypto/tcrypt-speed-blowfish-asm-x86_64.txt
http://koti.mbnet.fi/axh/kernel/crypto/tcrypt-speed-blowfish-c-x86_64.txt

Tests were run on:
 vendor_id	: AuthenticAMD
 cpu family	: 16
 model		: 10
 model name	: AMD Phenom(tm) II X6 1055T Processor
 stepping	: 0

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 392 insertions, 0 deletions

diff --git a/arch/x86/crypto/blowfish-x86_64-asm_64.S b/arch/x86/crypto/blowfish-x86_64-asm_64.S
new file mode 100644
index 000000000000..44eb23ab9676
--- /dev/null
+++ b/arch/x86/crypto/blowfish-x86_64-asm_64.S
@@ -0,0 +1,392 @@
+/*
+ * Blowfish Cipher Algorithm (x86_64)
+ *
+ * Copyright (C) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
+ * USA
+ *
+ */
+
+.file "blowfish-x86_64-asm.S"
+.text
+
+/* structure of crypto context */
+#define p	0
+#define s0	((16 + 2) * 4)
+#define s1	((16 + 2 + (1 * 256)) * 4)
+#define s2	((16 + 2 + (2 * 256)) * 4)
+#define s3	((16 + 2 + (3 * 256)) * 4)
+
+/* register macros */
+#define CTX %rdi
+#define RIO %rsi
+
+#define RX0 %rax
+#define RX1 %rbx
+#define RX2 %rcx
+#define RX3 %rdx
+
+#define RX0d %eax
+#define RX1d %ebx
+#define RX2d %ecx
+#define RX3d %edx
+
+#define RX0bl %al
+#define RX1bl %bl
+#define RX2bl %cl
+#define RX3bl %dl
+
+#define RX0bh %ah
+#define RX1bh %bh
+#define RX2bh %ch
+#define RX3bh %dh
+
+#define RT0 %rbp
+#define RT1 %rsi
+
+#define RT0d %ebp
+#define RT1d %esi
+
+#define RK0 %r8
+#define RK1 %r9
+#define RK2 %r10
+#define RK3 %r11
+
+#define RK0d %r8d
+#define RK1d %r9d
+#define RK2d %r10d
+#define RK3d %r11d
+
+#define RKEY %r12
+
+/***********************************************************************
+ * 1-way blowfish
+ ***********************************************************************/
+#define F(x, k) \
+	rorq $16,		x; \
+	movzbl x ## bh,		RT0d; \
+	movzbl x ## bl,		RT1d; \
+	rolq $16,		x; \
+	movl s0(CTX,RT0,4),	k ## d; \
+	addl s1(CTX,RT1,4),	k ## d; \
+	movzbl x ## bh,		RT0d; \
+	movzbl x ## bl,		RT1d; \
+	rolq $32,		x; \
+	xorl s2(CTX,RT0,4),	k ## d; \
+	addl s3(CTX,RT1,4),	k ## d; \
+	xorq k,			x;
+
+#define add_roundkey_enc(n) \
+	xorq p+4*(n)(CTX), 	RX0;
+
+#define round_enc(n) \
+	add_roundkey_enc(n); \
+	\
+	F(RX0, RK0); \
+	F(RX0, RK0);
+
+#define round_final_enc(n) \
+	xorq p+4*(n)(CTX), 	RX0;
+
+#define add_roundkey_dec(n) \
+	movq p+4*(n-1)(CTX),	RT0; \
+	rorq $32,		RT0; \
+	xorq RT0,		RX0;
+
+#define round_dec(n) \
+	add_roundkey_dec(n); \
+	\
+	F(RX0, RK0); \
+	F(RX0, RK0); \
+
+#define read_block() \
+	movq (RIO), 		RX0; \
+	rorq $32, 		RX0; \
+	bswapq 			RX0;
+
+#define write_block() \
+	bswapq 			RX0; \
+	movq RX0, 		(RIO);
+
+#define xor_block() \
+	bswapq 			RX0; \
+	xorq RX0, 		(RIO);
+
+.align 8
+.global __blowfish_enc_blk
+.type   __blowfish_enc_blk,@function;
+
+__blowfish_enc_blk:
+	// input:
+	//	%rdi: ctx, CTX
+	//	%rsi: dst
+	//	%rdx: src
+	//	%rcx: bool xor
+	pushq %rbp;
+	pushq %rbx;
+
+	pushq %rsi;
+	pushq %rcx;
+	movq %rdx, RIO;
+
+	read_block();
+
+	round_enc(0);
+	round_enc(2);
+	round_enc(4);
+	round_enc(6);
+	round_enc(8);
+	round_enc(10);
+	round_enc(12);
+	round_enc(14);
+	add_roundkey_enc(16);
+
+	popq %rbp;
+	popq RIO;
+
+	test %bpl, %bpl;
+	jnz __enc_xor;
+
+	write_block();
+
+__enc_ret:
+	popq %rbx;
+	popq %rbp;
+
+	ret;
+
+__enc_xor:
+	xor_block();
+
+	jmp __enc_ret;
+
+.align 8
+.global blowfish_dec_blk
+.type   blowfish_dec_blk,@function;
+
+blowfish_dec_blk:
+	// input:
+	//	%rdi: ctx, CTX
+	//	%rsi: dst
+	//	%rdx: src
+	pushq %rbp;
+	pushq %rbx;
+
+	pushq %rsi;
+	movq %rdx, RIO;
+
+	read_block();
+
+	round_dec(17);
+	round_dec(15);
+	round_dec(13);
+	round_dec(11);
+	round_dec(9);
+	round_dec(7);
+	round_dec(5);
+	round_dec(3);
+	add_roundkey_dec(1);
+
+	popq RIO;
+	write_block();
+
+	popq %rbx;
+	popq %rbp;
+
+	ret;
+
+/**********************************************************************
+  4-way blowfish, four blocks parallel
+ **********************************************************************/
+#define add_preloaded_roundkey4() \
+	xorq RKEY,		RX0; \
+	xorq RKEY,		RX1; \
+	xorq RKEY,		RX2; \
+	xorq RKEY,		RX3;
+
+#define preload_roundkey_enc(n) \
+	movq p+4*(n)(CTX),	RKEY;
+
+#define add_roundkey_enc4(n) \
+	add_preloaded_roundkey4(); \
+	preload_roundkey_enc(n + 2);
+
+#define round_enc4(n) \
+	add_roundkey_enc4(n); \
+	\
+	F(RX0, RK0); \
+	F(RX1, RK1); \
+	F(RX2, RK2); \
+	F(RX3, RK3); \
+	\
+	F(RX0, RK0); \
+	F(RX1, RK1); \
+	F(RX2, RK2); \
+	F(RX3, RK3);
+
+#define preload_roundkey_dec(n) \
+	movq p+4*((n)-1)(CTX),	RKEY; \
+	rorq $32,		RKEY;
+
+#define add_roundkey_dec4(n) \
+	add_preloaded_roundkey4(); \
+	preload_roundkey_dec(n - 2);
+
+#define round_dec4(n) \
+	add_roundkey_dec4(n); \
+	\
+	F(RX0, RK0); \
+	F(RX1, RK1); \
+	F(RX2, RK2); \
+	F(RX3, RK3); \
+	\
+	F(RX0, RK0); \
+	F(RX1, RK1); \
+	F(RX2, RK2); \
+	F(RX3, RK3);
+
+#define read_block4() \
+	movq (RIO),		RX0; \
+	rorq $32,		RX0; \
+	bswapq 			RX0; \
+	\
+	movq 8(RIO),		RX1; \
+	rorq $32,		RX1; \
+	bswapq 			RX1; \
+	\
+	movq 16(RIO),		RX2; \
+	rorq $32,		RX2; \
+	bswapq 			RX2; \
+	\
+	movq 24(RIO),		RX3; \
+	rorq $32,		RX3; \
+	bswapq 			RX3;
+
+#define write_block4() \
+	bswapq 			RX0; \
+	movq RX0,		(RIO); \
+	\
+	bswapq 			RX1; \
+	movq RX1,		8(RIO); \
+	\
+	bswapq 			RX2; \
+	movq RX2,		16(RIO); \
+	\
+	bswapq 			RX3; \
+	movq RX3,		24(RIO);
+
+#define xor_block4() \
+	bswapq 			RX0; \
+	xorq RX0,		(RIO); \
+	\
+	bswapq 			RX1; \
+	xorq RX1,		8(RIO); \
+	\
+	bswapq 			RX2; \
+	xorq RX2,		16(RIO); \
+	\
+	bswapq 			RX3; \
+	xorq RX3,		24(RIO);
+
+.align 8
+.global __blowfish_enc_blk_4way
+.type   __blowfish_enc_blk_4way,@function;
+
+__blowfish_enc_blk_4way:
+	// input:
+	//	%rdi: ctx, CTX
+	//	%rsi: dst
+	//	%rdx: src
+	//	%rcx: bool xor
+	pushq %rbp;
+	pushq %rbx;
+	pushq RKEY;
+	preload_roundkey_enc(0);
+
+	pushq %rsi;
+	pushq %rcx;
+	movq %rdx, RIO;
+
+	read_block4();
+
+	round_enc4(0);
+	round_enc4(2);
+	round_enc4(4);
+	round_enc4(6);
+	round_enc4(8);
+	round_enc4(10);
+	round_enc4(12);
+	round_enc4(14);
+	add_preloaded_roundkey4();
+
+	popq %rbp;
+	popq RIO;
+
+	test %bpl, %bpl;
+	jnz __enc_xor4;
+
+	write_block4();
+
+__enc_ret4:
+	popq RKEY;
+	popq %rbx;
+	popq %rbp;
+
+	ret;
+
+__enc_xor4:
+	xor_block4();
+
+	jmp __enc_ret4;
+
+.align 8
+.global blowfish_dec_blk_4way
+.type   blowfish_dec_blk_4way,@function;
+
+blowfish_dec_blk_4way:
+	// input:
+	//	%rdi: ctx, CTX
+	//	%rsi: dst
+	//	%rdx: src
+	pushq %rbp;
+	pushq %rbx;
+	pushq RKEY;
+	preload_roundkey_dec(17);
+
+	pushq %rsi;
+	movq %rdx, RIO;
+
+	read_block4();
+
+	round_dec4(17);
+	round_dec4(15);
+	round_dec4(13);
+	round_dec4(11);
+	round_dec4(9);
+	round_dec4(7);
+	round_dec4(5);
+	round_dec4(3);
+	add_preloaded_roundkey4();
+
+	popq RIO;
+	write_block4();
+
+	popq RKEY;
+	popq %rbx;
+	popq %rbp;
+
+	ret;
+