1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * arch/arm/include/asm/xor.h
4 *
5 * Copyright (C) 2001 Russell King
6 */
7 #include <linux/hardirq.h>
8 #include <asm-generic/xor.h>
9 #include <asm/hwcap.h>
10 #include <asm/neon.h>
11
12 #define __XOR(a1, a2) a1 ^= a2
13
14 #define GET_BLOCK_2(dst) \
15 __asm__("ldmia %0, {%1, %2}" \
16 : "=r" (dst), "=r" (a1), "=r" (a2) \
17 : "" (dst))
18
19 #define GET_BLOCK_4(dst) \
20 __asm__("ldmia %0, {%1, %2, %3, %4}" \
21 : "=r" (dst), "=r" (a1), "=r" (a2), "=r" (a3), "=r" (a4) \
22 : "" (dst))
23
24 #define XOR_BLOCK_2(src) \
25 __asm__("ldmia %0!, {%1, %2}" \
26 : "=r" (src), "=r" (b1), "=r" (b2) \
27 : "" (src)); \
28 __XOR(a1, b1); __XOR(a2, b2);
29
30 #define XOR_BLOCK_4(src) \
31 __asm__("ldmia %0!, {%1, %2, %3, %4}" \
32 : "=r" (src), "=r" (b1), "=r" (b2), "=r" (b3), "=r" (b4) \
33 : "" (src)); \
34 __XOR(a1, b1); __XOR(a2, b2); __XOR(a3, b3); __XOR(a4, b4)
35
36 #define PUT_BLOCK_2(dst) \
37 __asm__ __volatile__("stmia %0!, {%2, %3}" \
38 : "=r" (dst) \
39 : "" (dst), "r" (a1), "r" (a2))
40
41 #define PUT_BLOCK_4(dst) \
42 __asm__ __volatile__("stmia %0!, {%2, %3, %4, %5}" \
43 : "=r" (dst) \
44 : "" (dst), "r" (a1), "r" (a2), "r" (a3), "r" (a4))
45
46 static void
47 xor_arm4regs_2(unsigned long bytes, unsigned long * __restrict p1,
48 const unsigned long * __restrict p2)
49 {
50 unsigned int lines = bytes / sizeof(unsigned long) / 4;
51 register unsigned int a1 __asm__("r4");
52 register unsigned int a2 __asm__("r5");
53 register unsigned int a3 __asm__("r6");
54 register unsigned int a4 __asm__("r10");
55 register unsigned int b1 __asm__("r8");
56 register unsigned int b2 __asm__("r9");
57 register unsigned int b3 __asm__("ip");
58 register unsigned int b4 __asm__("lr");
59
60 do {
61 GET_BLOCK_4(p1);
62 XOR_BLOCK_4(p2);
63 PUT_BLOCK_4(p1);
64 } while (--lines);
65 }
66
67 static void
68 xor_arm4regs_3(unsigned long bytes, unsigned long * __restrict p1,
69 const unsigned long * __restrict p2,
70 const unsigned long * __restrict p3)
71 {
72 unsigned int lines = bytes / sizeof(unsigned long) / 4;
73 register unsigned int a1 __asm__("r4");
74 register unsigned int a2 __asm__("r5");
75 register unsigned int a3 __asm__("r6");
76 register unsigned int a4 __asm__("r10");
77 register unsigned int b1 __asm__("r8");
78 register unsigned int b2 __asm__("r9");
79 register unsigned int b3 __asm__("ip");
80 register unsigned int b4 __asm__("lr");
81
82 do {
83 GET_BLOCK_4(p1);
84 XOR_BLOCK_4(p2);
85 XOR_BLOCK_4(p3);
86 PUT_BLOCK_4(p1);
87 } while (--lines);
88 }
89
90 static void
91 xor_arm4regs_4(unsigned long bytes, unsigned long * __restrict p1,
92 const unsigned long * __restrict p2,
93 const unsigned long * __restrict p3,
94 const unsigned long * __restrict p4)
95 {
96 unsigned int lines = bytes / sizeof(unsigned long) / 2;
97 register unsigned int a1 __asm__("r8");
98 register unsigned int a2 __asm__("r9");
99 register unsigned int b1 __asm__("ip");
100 register unsigned int b2 __asm__("lr");
101
102 do {
103 GET_BLOCK_2(p1);
104 XOR_BLOCK_2(p2);
105 XOR_BLOCK_2(p3);
106 XOR_BLOCK_2(p4);
107 PUT_BLOCK_2(p1);
108 } while (--lines);
109 }
110
111 static void
112 xor_arm4regs_5(unsigned long bytes, unsigned long * __restrict p1,
113 const unsigned long * __restrict p2,
114 const unsigned long * __restrict p3,
115 const unsigned long * __restrict p4,
116 const unsigned long * __restrict p5)
117 {
118 unsigned int lines = bytes / sizeof(unsigned long) / 2;
119 register unsigned int a1 __asm__("r8");
120 register unsigned int a2 __asm__("r9");
121 register unsigned int b1 __asm__("ip");
122 register unsigned int b2 __asm__("lr");
123
124 do {
125 GET_BLOCK_2(p1);
126 XOR_BLOCK_2(p2);
127 XOR_BLOCK_2(p3);
128 XOR_BLOCK_2(p4);
129 XOR_BLOCK_2(p5);
130 PUT_BLOCK_2(p1);
131 } while (--lines);
132 }
133
134 static struct xor_block_template xor_block_arm4regs = {
135 .name = "arm4regs",
136 .do_2 = xor_arm4regs_2,
137 .do_3 = xor_arm4regs_3,
138 .do_4 = xor_arm4regs_4,
139 .do_5 = xor_arm4regs_5,
140 };
141
142 #undef XOR_TRY_TEMPLATES
143 #define XOR_TRY_TEMPLATES \
144 do { \
145 xor_speed(&xor_block_arm4regs); \
146 xor_speed(&xor_block_8regs); \
147 xor_speed(&xor_block_32regs); \
148 NEON_TEMPLATES; \
149 } while (0)
150
151 #ifdef CONFIG_KERNEL_MODE_NEON
152
153 extern struct xor_block_template const xor_block_neon_inner;
154
155 static void
156 xor_neon_2(unsigned long bytes, unsigned long * __restrict p1,
157 const unsigned long * __restrict p2)
158 {
159 if (in_interrupt()) {
160 xor_arm4regs_2(bytes, p1, p2);
161 } else {
162 kernel_neon_begin();
163 xor_block_neon_inner.do_2(bytes, p1, p2);
164 kernel_neon_end();
165 }
166 }
167
168 static void
169 xor_neon_3(unsigned long bytes, unsigned long * __restrict p1,
170 const unsigned long * __restrict p2,
171 const unsigned long * __restrict p3)
172 {
173 if (in_interrupt()) {
174 xor_arm4regs_3(bytes, p1, p2, p3);
175 } else {
176 kernel_neon_begin();
177 xor_block_neon_inner.do_3(bytes, p1, p2, p3);
178 kernel_neon_end();
179 }
180 }
181
182 static void
183 xor_neon_4(unsigned long bytes, unsigned long * __restrict p1,
184 const unsigned long * __restrict p2,
185 const unsigned long * __restrict p3,
186 const unsigned long * __restrict p4)
187 {
188 if (in_interrupt()) {
189 xor_arm4regs_4(bytes, p1, p2, p3, p4);
190 } else {
191 kernel_neon_begin();
192 xor_block_neon_inner.do_4(bytes, p1, p2, p3, p4);
193 kernel_neon_end();
194 }
195 }
196
197 static void
198 xor_neon_5(unsigned long bytes, unsigned long * __restrict p1,
199 const unsigned long * __restrict p2,
200 const unsigned long * __restrict p3,
201 const unsigned long * __restrict p4,
202 const unsigned long * __restrict p5)
203 {
204 if (in_interrupt()) {
205 xor_arm4regs_5(bytes, p1, p2, p3, p4, p5);
206 } else {
207 kernel_neon_begin();
208 xor_block_neon_inner.do_5(bytes, p1, p2, p3, p4, p5);
209 kernel_neon_end();
210 }
211 }
212
213 static struct xor_block_template xor_block_neon = {
214 .name = "neon",
215 .do_2 = xor_neon_2,
216 .do_3 = xor_neon_3,
217 .do_4 = xor_neon_4,
218 .do_5 = xor_neon_5
219 };
220
221 #define NEON_TEMPLATES \
222 do { if (cpu_has_neon()) xor_speed(&xor_block_neon); } while (0)
223 #else
224 #define NEON_TEMPLATES
225 #endif
226
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