1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Accelerated GHASH implementation with Intel
4 * instructions. This file contains accelerate
5 * implementation. More information about PCLM
6 *
7 * https://www.intel.com/content/dam/develop/e
8 *
9 * Copyright (c) 2009 Intel Corp.
10 * Author: Huang Ying <ying.huang@intel.com>
11 * Vinodh Gopal
12 * Erdinc Ozturk
13 * Deniz Karakoyunlu
14 */
15
16 #include <linux/linkage.h>
17 #include <asm/frame.h>
18
19 .section .rodata.cst16.bswap_mask, "aM"
20 .align 16
21 .Lbswap_mask:
22 .octa 0x000102030405060708090a0b0c0d0e
23
24 #define DATA %xmm0
25 #define SHASH %xmm1
26 #define T1 %xmm2
27 #define T2 %xmm3
28 #define T3 %xmm4
29 #define BSWAP %xmm5
30 #define IN1 %xmm6
31
32 .text
33
34 /*
35 * __clmul_gf128mul_ble: internal ABI
36 * input:
37 * DATA: operand1
38 * SHASH: operand2, hash
39 * output:
40 * DATA: operand1 * ope
41 * changed:
42 * T1
43 * T2
44 * T3
45 */
46 SYM_FUNC_START_LOCAL(__clmul_gf128mul_ble)
47 movaps DATA, T1
48 pshufd $0b01001110, DATA, T2
49 pshufd $0b01001110, SHASH, T3
50 pxor DATA, T2
51 pxor SHASH, T3
52
53 pclmulqdq $0x00, SHASH, DATA # DATA
54 pclmulqdq $0x11, SHASH, T1 # T1 =
55 pclmulqdq $0x00, T3, T2 # T2 =
56 pxor DATA, T2
57 pxor T1, T2 # T2 =
58
59 movaps T2, T3
60 pslldq $8, T3
61 psrldq $8, T2
62 pxor T3, DATA
63 pxor T2, T1 # <T1:
64 # carr
65
66 # first phase of the reduction
67 movaps DATA, T3
68 psllq $1, T3
69 pxor DATA, T3
70 psllq $5, T3
71 pxor DATA, T3
72 psllq $57, T3
73 movaps T3, T2
74 pslldq $8, T2
75 psrldq $8, T3
76 pxor T2, DATA
77 pxor T3, T1
78
79 # second phase of the reduction
80 movaps DATA, T2
81 psrlq $5, T2
82 pxor DATA, T2
83 psrlq $1, T2
84 pxor DATA, T2
85 psrlq $1, T2
86 pxor T2, T1
87 pxor T1, DATA
88 RET
89 SYM_FUNC_END(__clmul_gf128mul_ble)
90
91 /* void clmul_ghash_mul(char *dst, const le128
92 SYM_FUNC_START(clmul_ghash_mul)
93 FRAME_BEGIN
94 movups (%rdi), DATA
95 movups (%rsi), SHASH
96 movaps .Lbswap_mask(%rip), BSWAP
97 pshufb BSWAP, DATA
98 call __clmul_gf128mul_ble
99 pshufb BSWAP, DATA
100 movups DATA, (%rdi)
101 FRAME_END
102 RET
103 SYM_FUNC_END(clmul_ghash_mul)
104
105 /*
106 * void clmul_ghash_update(char *dst, const ch
107 * const le128 *shash)
108 */
109 SYM_FUNC_START(clmul_ghash_update)
110 FRAME_BEGIN
111 cmp $16, %rdx
112 jb .Lupdate_just_ret # check length
113 movaps .Lbswap_mask(%rip), BSWAP
114 movups (%rdi), DATA
115 movups (%rcx), SHASH
116 pshufb BSWAP, DATA
117 .align 4
118 .Lupdate_loop:
119 movups (%rsi), IN1
120 pshufb BSWAP, IN1
121 pxor IN1, DATA
122 call __clmul_gf128mul_ble
123 sub $16, %rdx
124 add $16, %rsi
125 cmp $16, %rdx
126 jge .Lupdate_loop
127 pshufb BSWAP, DATA
128 movups DATA, (%rdi)
129 .Lupdate_just_ret:
130 FRAME_END
131 RET
132 SYM_FUNC_END(clmul_ghash_update)
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