crc32.c 42 KB

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  1. /*
  2. * Aug 8, 2011 Bob Pearson with help from Joakim Tjernlund and George Spelvin
  3. * cleaned up code to current version of sparse and added the slicing-by-8
  4. * algorithm to the closely similar existing slicing-by-4 algorithm.
  5. *
  6. * Oct 15, 2000 Matt Domsch <Matt_Domsch@dell.com>
  7. * Nicer crc32 functions/docs submitted by linux@horizon.com. Thanks!
  8. * Code was from the public domain, copyright abandoned. Code was
  9. * subsequently included in the kernel, thus was re-licensed under the
  10. * GNU GPL v2.
  11. *
  12. * Oct 12, 2000 Matt Domsch <Matt_Domsch@dell.com>
  13. * Same crc32 function was used in 5 other places in the kernel.
  14. * I made one version, and deleted the others.
  15. * There are various incantations of crc32(). Some use a seed of 0 or ~0.
  16. * Some xor at the end with ~0. The generic crc32() function takes
  17. * seed as an argument, and doesn't xor at the end. Then individual
  18. * users can do whatever they need.
  19. * drivers/net/smc9194.c uses seed ~0, doesn't xor with ~0.
  20. * fs/jffs2 uses seed 0, doesn't xor with ~0.
  21. * fs/partitions/efi.c uses seed ~0, xor's with ~0.
  22. *
  23. * This source code is licensed under the GNU General Public License,
  24. * Version 2. See the file COPYING for more details.
  25. */
  26. /* see: Documentation/crc32.txt for a description of algorithms */
  27. #include <linux/crc32.h>
  28. #include <linux/module.h>
  29. #include <linux/types.h>
  30. #include "crc32defs.h"
  31. #if CRC_LE_BITS > 8
  32. # define tole(x) ((__force u32) __constant_cpu_to_le32(x))
  33. #else
  34. # define tole(x) (x)
  35. #endif
  36. #if CRC_BE_BITS > 8
  37. # define tobe(x) ((__force u32) __constant_cpu_to_be32(x))
  38. #else
  39. # define tobe(x) (x)
  40. #endif
  41. #include "crc32table.h"
  42. MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>");
  43. MODULE_DESCRIPTION("Various CRC32 calculations");
  44. MODULE_LICENSE("GPL");
  45. #if CRC_LE_BITS > 8 || CRC_BE_BITS > 8
  46. /* implements slicing-by-4 or slicing-by-8 algorithm */
  47. static inline u32
  48. crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
  49. {
  50. # ifdef __LITTLE_ENDIAN
  51. # define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8)
  52. # define DO_CRC4 (t3[(q) & 255] ^ t2[(q >> 8) & 255] ^ \
  53. t1[(q >> 16) & 255] ^ t0[(q >> 24) & 255])
  54. # define DO_CRC8 (t7[(q) & 255] ^ t6[(q >> 8) & 255] ^ \
  55. t5[(q >> 16) & 255] ^ t4[(q >> 24) & 255])
  56. # else
  57. # define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
  58. # define DO_CRC4 (t0[(q) & 255] ^ t1[(q >> 8) & 255] ^ \
  59. t2[(q >> 16) & 255] ^ t3[(q >> 24) & 255])
  60. # define DO_CRC8 (t4[(q) & 255] ^ t5[(q >> 8) & 255] ^ \
  61. t6[(q >> 16) & 255] ^ t7[(q >> 24) & 255])
  62. # endif
  63. const u32 *b;
  64. size_t rem_len;
  65. # ifdef CONFIG_X86
  66. size_t i;
  67. # endif
  68. const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3];
  69. const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7];
  70. u32 q;
  71. /* Align it */
  72. if (unlikely((long)buf & 3 && len)) {
  73. do {
  74. DO_CRC(*buf++);
  75. } while ((--len) && ((long)buf)&3);
  76. }
  77. # if CRC_LE_BITS == 32
  78. rem_len = len & 3;
  79. len = len >> 2;
  80. # else
  81. rem_len = len & 7;
  82. len = len >> 3;
  83. # endif
  84. b = (const u32 *)buf;
  85. # ifdef CONFIG_X86
  86. --b;
  87. for (i = 0; i < len; i++) {
  88. # else
  89. for (--b; len; --len) {
  90. # endif
  91. q = crc ^ *++b; /* use pre increment for speed */
  92. # if CRC_LE_BITS == 32
  93. crc = DO_CRC4;
  94. # else
  95. crc = DO_CRC8;
  96. q = *++b;
  97. crc ^= DO_CRC4;
  98. # endif
  99. }
  100. len = rem_len;
  101. /* And the last few bytes */
  102. if (len) {
  103. u8 *p = (u8 *)(b + 1) - 1;
  104. # ifdef CONFIG_X86
  105. for (i = 0; i < len; i++)
  106. DO_CRC(*++p); /* use pre increment for speed */
  107. # else
  108. do {
  109. DO_CRC(*++p); /* use pre increment for speed */
  110. } while (--len);
  111. # endif
  112. }
  113. return crc;
  114. #undef DO_CRC
  115. #undef DO_CRC4
  116. #undef DO_CRC8
  117. }
  118. #endif
  119. /**
  120. * crc32_le() - Calculate bitwise little-endian Ethernet AUTODIN II CRC32
  121. * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for
  122. * other uses, or the previous crc32 value if computing incrementally.
  123. * @p: pointer to buffer over which CRC is run
  124. * @len: length of buffer @p
  125. */
  126. static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p,
  127. size_t len, const u32 (*tab)[256],
  128. u32 polynomial)
  129. {
  130. #if CRC_LE_BITS == 1
  131. int i;
  132. while (len--) {
  133. crc ^= *p++;
  134. for (i = 0; i < 8; i++)
  135. crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0);
  136. }
  137. # elif CRC_LE_BITS == 2
  138. while (len--) {
  139. crc ^= *p++;
  140. crc = (crc >> 2) ^ tab[0][crc & 3];
  141. crc = (crc >> 2) ^ tab[0][crc & 3];
  142. crc = (crc >> 2) ^ tab[0][crc & 3];
  143. crc = (crc >> 2) ^ tab[0][crc & 3];
  144. }
  145. # elif CRC_LE_BITS == 4
  146. while (len--) {
  147. crc ^= *p++;
  148. crc = (crc >> 4) ^ tab[0][crc & 15];
  149. crc = (crc >> 4) ^ tab[0][crc & 15];
  150. }
  151. # elif CRC_LE_BITS == 8
  152. /* aka Sarwate algorithm */
  153. while (len--) {
  154. crc ^= *p++;
  155. crc = (crc >> 8) ^ tab[0][crc & 255];
  156. }
  157. # else
  158. crc = (__force u32) __cpu_to_le32(crc);
  159. crc = crc32_body(crc, p, len, tab);
  160. crc = __le32_to_cpu((__force __le32)crc);
  161. #endif
  162. return crc;
  163. }
  164. #if CRC_LE_BITS == 1
  165. u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
  166. {
  167. return crc32_le_generic(crc, p, len, NULL, CRCPOLY_LE);
  168. }
  169. u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
  170. {
  171. return crc32_le_generic(crc, p, len, NULL, CRC32C_POLY_LE);
  172. }
  173. #else
  174. u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
  175. {
  176. return crc32_le_generic(crc, p, len, crc32table_le, CRCPOLY_LE);
  177. }
  178. u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
  179. {
  180. return crc32_le_generic(crc, p, len, crc32ctable_le, CRC32C_POLY_LE);
  181. }
  182. #endif
  183. EXPORT_SYMBOL(crc32_le);
  184. EXPORT_SYMBOL(__crc32c_le);
  185. /**
  186. * crc32_be() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32
  187. * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for
  188. * other uses, or the previous crc32 value if computing incrementally.
  189. * @p: pointer to buffer over which CRC is run
  190. * @len: length of buffer @p
  191. */
  192. static inline u32 __pure crc32_be_generic(u32 crc, unsigned char const *p,
  193. size_t len, const u32 (*tab)[256],
  194. u32 polynomial)
  195. {
  196. #if CRC_BE_BITS == 1
  197. int i;
  198. while (len--) {
  199. crc ^= *p++ << 24;
  200. for (i = 0; i < 8; i++)
  201. crc =
  202. (crc << 1) ^ ((crc & 0x80000000) ? polynomial :
  203. 0);
  204. }
  205. # elif CRC_BE_BITS == 2
  206. while (len--) {
  207. crc ^= *p++ << 24;
  208. crc = (crc << 2) ^ tab[0][crc >> 30];
  209. crc = (crc << 2) ^ tab[0][crc >> 30];
  210. crc = (crc << 2) ^ tab[0][crc >> 30];
  211. crc = (crc << 2) ^ tab[0][crc >> 30];
  212. }
  213. # elif CRC_BE_BITS == 4
  214. while (len--) {
  215. crc ^= *p++ << 24;
  216. crc = (crc << 4) ^ tab[0][crc >> 28];
  217. crc = (crc << 4) ^ tab[0][crc >> 28];
  218. }
  219. # elif CRC_BE_BITS == 8
  220. while (len--) {
  221. crc ^= *p++ << 24;
  222. crc = (crc << 8) ^ tab[0][crc >> 24];
  223. }
  224. # else
  225. crc = (__force u32) __cpu_to_be32(crc);
  226. crc = crc32_body(crc, p, len, tab);
  227. crc = __be32_to_cpu((__force __be32)crc);
  228. # endif
  229. return crc;
  230. }
  231. #if CRC_LE_BITS == 1
  232. u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
  233. {
  234. return crc32_be_generic(crc, p, len, NULL, CRCPOLY_BE);
  235. }
  236. #else
  237. u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
  238. {
  239. return crc32_be_generic(crc, p, len, crc32table_be, CRCPOLY_BE);
  240. }
  241. #endif
  242. EXPORT_SYMBOL(crc32_be);
  243. #ifdef CONFIG_CRC32_SELFTEST
  244. /* 4096 random bytes */
  245. static u8 __attribute__((__aligned__(8))) test_buf[] =
  246. {
  247. 0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30,
  248. 0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4,
  249. 0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60,
  250. 0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c,
  251. 0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4,
  252. 0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a,
  253. 0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a,
  254. 0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4,
  255. 0x53, 0x24, 0xc5, 0x8b, 0xce, 0x47, 0xb2, 0xb9,
  256. 0x32, 0xcb, 0xc1, 0xd0, 0x03, 0x57, 0x4e, 0xd4,
  257. 0xe9, 0x3c, 0xa1, 0x63, 0xcf, 0x12, 0x0e, 0xca,
  258. 0xe1, 0x13, 0xd1, 0x93, 0xa6, 0x88, 0x5c, 0x61,
  259. 0x5b, 0xbb, 0xf0, 0x19, 0x46, 0xb4, 0xcf, 0x9e,
  260. 0xb6, 0x6b, 0x4c, 0x3a, 0xcf, 0x60, 0xf9, 0x7a,
  261. 0x8d, 0x07, 0x63, 0xdb, 0x40, 0xe9, 0x0b, 0x6f,
  262. 0xad, 0x97, 0xf1, 0xed, 0xd0, 0x1e, 0x26, 0xfd,
  263. 0xbf, 0xb7, 0xc8, 0x04, 0x94, 0xf8, 0x8b, 0x8c,
  264. 0xf1, 0xab, 0x7a, 0xd4, 0xdd, 0xf3, 0xe8, 0x88,
  265. 0xc3, 0xed, 0x17, 0x8a, 0x9b, 0x40, 0x0d, 0x53,
  266. 0x62, 0x12, 0x03, 0x5f, 0x1b, 0x35, 0x32, 0x1f,
  267. 0xb4, 0x7b, 0x93, 0x78, 0x0d, 0xdb, 0xce, 0xa4,
  268. 0xc0, 0x47, 0xd5, 0xbf, 0x68, 0xe8, 0x5d, 0x74,
  269. 0x8f, 0x8e, 0x75, 0x1c, 0xb2, 0x4f, 0x9a, 0x60,
  270. 0xd1, 0xbe, 0x10, 0xf4, 0x5c, 0xa1, 0x53, 0x09,
  271. 0xa5, 0xe0, 0x09, 0x54, 0x85, 0x5c, 0xdc, 0x07,
  272. 0xe7, 0x21, 0x69, 0x7b, 0x8a, 0xfd, 0x90, 0xf1,
  273. 0x22, 0xd0, 0xb4, 0x36, 0x28, 0xe6, 0xb8, 0x0f,
  274. 0x39, 0xde, 0xc8, 0xf3, 0x86, 0x60, 0x34, 0xd2,
  275. 0x5e, 0xdf, 0xfd, 0xcf, 0x0f, 0xa9, 0x65, 0xf0,
  276. 0xd5, 0x4d, 0x96, 0x40, 0xe3, 0xdf, 0x3f, 0x95,
  277. 0x5a, 0x39, 0x19, 0x93, 0xf4, 0x75, 0xce, 0x22,
  278. 0x00, 0x1c, 0x93, 0xe2, 0x03, 0x66, 0xf4, 0x93,
  279. 0x73, 0x86, 0x81, 0x8e, 0x29, 0x44, 0x48, 0x86,
  280. 0x61, 0x7c, 0x48, 0xa3, 0x43, 0xd2, 0x9c, 0x8d,
  281. 0xd4, 0x95, 0xdd, 0xe1, 0x22, 0x89, 0x3a, 0x40,
  282. 0x4c, 0x1b, 0x8a, 0x04, 0xa8, 0x09, 0x69, 0x8b,
  283. 0xea, 0xc6, 0x55, 0x8e, 0x57, 0xe6, 0x64, 0x35,
  284. 0xf0, 0xc7, 0x16, 0x9f, 0x5d, 0x5e, 0x86, 0x40,
  285. 0x46, 0xbb, 0xe5, 0x45, 0x88, 0xfe, 0xc9, 0x63,
  286. 0x15, 0xfb, 0xf5, 0xbd, 0x71, 0x61, 0xeb, 0x7b,
  287. 0x78, 0x70, 0x07, 0x31, 0x03, 0x9f, 0xb2, 0xc8,
  288. 0xa7, 0xab, 0x47, 0xfd, 0xdf, 0xa0, 0x78, 0x72,
  289. 0xa4, 0x2a, 0xe4, 0xb6, 0xba, 0xc0, 0x1e, 0x86,
  290. 0x71, 0xe6, 0x3d, 0x18, 0x37, 0x70, 0xe6, 0xff,
  291. 0xe0, 0xbc, 0x0b, 0x22, 0xa0, 0x1f, 0xd3, 0xed,
  292. 0xa2, 0x55, 0x39, 0xab, 0xa8, 0x13, 0x73, 0x7c,
  293. 0x3f, 0xb2, 0xd6, 0x19, 0xac, 0xff, 0x99, 0xed,
  294. 0xe8, 0xe6, 0xa6, 0x22, 0xe3, 0x9c, 0xf1, 0x30,
  295. 0xdc, 0x01, 0x0a, 0x56, 0xfa, 0xe4, 0xc9, 0x99,
  296. 0xdd, 0xa8, 0xd8, 0xda, 0x35, 0x51, 0x73, 0xb4,
  297. 0x40, 0x86, 0x85, 0xdb, 0x5c, 0xd5, 0x85, 0x80,
  298. 0x14, 0x9c, 0xfd, 0x98, 0xa9, 0x82, 0xc5, 0x37,
  299. 0xff, 0x32, 0x5d, 0xd0, 0x0b, 0xfa, 0xdc, 0x04,
  300. 0x5e, 0x09, 0xd2, 0xca, 0x17, 0x4b, 0x1a, 0x8e,
  301. 0x15, 0xe1, 0xcc, 0x4e, 0x52, 0x88, 0x35, 0xbd,
  302. 0x48, 0xfe, 0x15, 0xa0, 0x91, 0xfd, 0x7e, 0x6c,
  303. 0x0e, 0x5d, 0x79, 0x1b, 0x81, 0x79, 0xd2, 0x09,
  304. 0x34, 0x70, 0x3d, 0x81, 0xec, 0xf6, 0x24, 0xbb,
  305. 0xfb, 0xf1, 0x7b, 0xdf, 0x54, 0xea, 0x80, 0x9b,
  306. 0xc7, 0x99, 0x9e, 0xbd, 0x16, 0x78, 0x12, 0x53,
  307. 0x5e, 0x01, 0xa7, 0x4e, 0xbd, 0x67, 0xe1, 0x9b,
  308. 0x4c, 0x0e, 0x61, 0x45, 0x97, 0xd2, 0xf0, 0x0f,
  309. 0xfe, 0x15, 0x08, 0xb7, 0x11, 0x4c, 0xe7, 0xff,
  310. 0x81, 0x53, 0xff, 0x91, 0x25, 0x38, 0x7e, 0x40,
  311. 0x94, 0xe5, 0xe0, 0xad, 0xe6, 0xd9, 0x79, 0xb6,
  312. 0x92, 0xc9, 0xfc, 0xde, 0xc3, 0x1a, 0x23, 0xbb,
  313. 0xdd, 0xc8, 0x51, 0x0c, 0x3a, 0x72, 0xfa, 0x73,
  314. 0x6f, 0xb7, 0xee, 0x61, 0x39, 0x03, 0x01, 0x3f,
  315. 0x7f, 0x94, 0x2e, 0x2e, 0xba, 0x3a, 0xbb, 0xb4,
  316. 0xfa, 0x6a, 0x17, 0xfe, 0xea, 0xef, 0x5e, 0x66,
  317. 0x97, 0x3f, 0x32, 0x3d, 0xd7, 0x3e, 0xb1, 0xf1,
  318. 0x6c, 0x14, 0x4c, 0xfd, 0x37, 0xd3, 0x38, 0x80,
  319. 0xfb, 0xde, 0xa6, 0x24, 0x1e, 0xc8, 0xca, 0x7f,
  320. 0x3a, 0x93, 0xd8, 0x8b, 0x18, 0x13, 0xb2, 0xe5,
  321. 0xe4, 0x93, 0x05, 0x53, 0x4f, 0x84, 0x66, 0xa7,
  322. 0x58, 0x5c, 0x7b, 0x86, 0x52, 0x6d, 0x0d, 0xce,
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  737. 0xa9, 0x19, 0x72, 0xa5, 0x7f, 0x2c, 0x39, 0xb7,
  738. 0x7d, 0xb7, 0xf1, 0x12, 0x65, 0x27, 0x4b, 0x5a,
  739. 0xde, 0x17, 0xfe, 0xad, 0x44, 0xf3, 0x20, 0x4d,
  740. 0xfd, 0xe4, 0x1f, 0xb5, 0x81, 0xb0, 0x36, 0x37,
  741. 0x08, 0x6f, 0xc3, 0x0c, 0xe9, 0x85, 0x98, 0x82,
  742. 0xa9, 0x62, 0x0c, 0xc4, 0x97, 0xc0, 0x50, 0xc8,
  743. 0xa7, 0x3c, 0x50, 0x9f, 0x43, 0xb9, 0xcd, 0x5e,
  744. 0x4d, 0xfa, 0x1c, 0x4b, 0x0b, 0xa9, 0x98, 0x85,
  745. 0x38, 0x92, 0xac, 0x8d, 0xe4, 0xad, 0x9b, 0x98,
  746. 0xab, 0xd9, 0x38, 0xac, 0x62, 0x52, 0xa3, 0x22,
  747. 0x63, 0x0f, 0xbf, 0x95, 0x48, 0xdf, 0x69, 0xe7,
  748. 0x8b, 0x33, 0xd5, 0xb2, 0xbd, 0x05, 0x49, 0x49,
  749. 0x9d, 0x57, 0x73, 0x19, 0x33, 0xae, 0xfa, 0x33,
  750. 0xf1, 0x19, 0xa8, 0x80, 0xce, 0x04, 0x9f, 0xbc,
  751. 0x1d, 0x65, 0x82, 0x1b, 0xe5, 0x3a, 0x51, 0xc8,
  752. 0x1c, 0x21, 0xe3, 0x5d, 0xf3, 0x7d, 0x9b, 0x2f,
  753. 0x2c, 0x1d, 0x4a, 0x7f, 0x9b, 0x68, 0x35, 0xa3,
  754. 0xb2, 0x50, 0xf7, 0x62, 0x79, 0xcd, 0xf4, 0x98,
  755. 0x4f, 0xe5, 0x63, 0x7c, 0x3e, 0x45, 0x31, 0x8c,
  756. 0x16, 0xa0, 0x12, 0xc8, 0x58, 0xce, 0x39, 0xa6,
  757. 0xbc, 0x54, 0xdb, 0xc5, 0xe0, 0xd5, 0xba, 0xbc,
  758. 0xb9, 0x04, 0xf4, 0x8d, 0xe8, 0x2f, 0x15, 0x9d,
  759. };
  760. /* 100 test cases */
  761. static struct crc_test {
  762. u32 crc; /* random starting crc */
  763. u32 start; /* random 6 bit offset in buf */
  764. u32 length; /* random 11 bit length of test */
  765. u32 crc_le; /* expected crc32_le result */
  766. u32 crc_be; /* expected crc32_be result */
  767. u32 crc32c_le; /* expected crc32c_le result */
  768. } test[] =
  769. {
  770. {0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1,
  771. 0xf6e93d6c},
  772. {0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad,
  773. 0x0fe92aca},
  774. {0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f,
  775. 0x52e1ebb8},
  776. {0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a,
  777. 0x0798af9a},
  778. {0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2,
  779. 0x18eb3152},
  780. {0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793,
  781. 0xd00d08c7},
  782. {0x292561e8, 0x0000000c, 0x00000403, 0xa2ba8aaf, 0x0b797aed,
  783. 0x8ba966bc},
  784. {0x415037f6, 0x00000003, 0x00000676, 0xa17d52e8, 0x7f0fdf35,
  785. 0x11d694a2},
  786. {0x3466e707, 0x00000026, 0x00000042, 0x258319be, 0x75c484a2,
  787. 0x6ab3208d},
  788. {0xafd1281b, 0x00000023, 0x000002ee, 0x4428eaf8, 0x06c7ad10,
  789. 0xba4603c5},
  790. {0xd3857b18, 0x00000028, 0x000004a2, 0x5c430821, 0xb062b7cb,
  791. 0xe6071c6f},
  792. {0x1d825a8f, 0x0000002b, 0x0000050b, 0xd2c45f0c, 0xd68634e0,
  793. 0x179ec30a},
  794. {0x5033e3bc, 0x0000000b, 0x00000078, 0xa3ea4113, 0xac6d31fb,
  795. 0x0903beb8},
  796. {0x94f1fb5e, 0x0000000f, 0x000003a2, 0xfbfc50b1, 0x3cfe50ed,
  797. 0x6a7cb4fa},
  798. {0xc9a0fe14, 0x00000009, 0x00000473, 0x5fb61894, 0x87070591,
  799. 0xdb535801},
  800. {0x88a034b1, 0x0000001c, 0x000005ad, 0xc1b16053, 0x46f95c67,
  801. 0x92bed597},
  802. {0xf0f72239, 0x00000020, 0x0000026d, 0xa6fa58f3, 0xf8c2c1dd,
  803. 0x192a3f1b},
  804. {0xcc20a5e3, 0x0000003b, 0x0000067a, 0x7740185a, 0x308b979a,
  805. 0xccbaec1a},
  806. {0xce589c95, 0x0000002b, 0x00000641, 0xd055e987, 0x40aae25b,
  807. 0x7eabae4d},
  808. {0x78edc885, 0x00000035, 0x000005be, 0xa39cb14b, 0x035b0d1f,
  809. 0x28c72982},
  810. {0x9d40a377, 0x0000003b, 0x00000038, 0x1f47ccd2, 0x197fbc9d,
  811. 0xc3cd4d18},
  812. {0x703d0e01, 0x0000003c, 0x000006f1, 0x88735e7c, 0xfed57c5a,
  813. 0xbca8f0e7},
  814. {0x776bf505, 0x0000000f, 0x000005b2, 0x5cc4fc01, 0xf32efb97,
  815. 0x713f60b3},
  816. {0x4a3e7854, 0x00000027, 0x000004b8, 0x8d923c82, 0x0cbfb4a2,
  817. 0xebd08fd5},
  818. {0x209172dd, 0x0000003b, 0x00000356, 0xb89e9c2b, 0xd7868138,
  819. 0x64406c59},
  820. {0x3ba4cc5b, 0x0000002f, 0x00000203, 0xe51601a9, 0x5b2a1032,
  821. 0x7421890e},
  822. {0xfc62f297, 0x00000000, 0x00000079, 0x71a8e1a2, 0x5d88685f,
  823. 0xe9347603},
  824. {0x64280b8b, 0x00000016, 0x000007ab, 0x0fa7a30c, 0xda3a455f,
  825. 0x1bef9060},
  826. {0x97dd724b, 0x00000033, 0x000007ad, 0x5788b2f4, 0xd7326d32,
  827. 0x34720072},
  828. {0x61394b52, 0x00000035, 0x00000571, 0xc66525f1, 0xcabe7fef,
  829. 0x48310f59},
  830. {0x29b4faff, 0x00000024, 0x0000006e, 0xca13751e, 0x993648e0,
  831. 0x783a4213},
  832. {0x29bfb1dc, 0x0000000b, 0x00000244, 0x436c43f7, 0x429f7a59,
  833. 0x9e8efd41},
  834. {0x86ae934b, 0x00000035, 0x00000104, 0x0760ec93, 0x9cf7d0f4,
  835. 0xfc3d34a5},
  836. {0xc4c1024e, 0x0000002e, 0x000006b1, 0x6516a3ec, 0x19321f9c,
  837. 0x17a52ae2},
  838. {0x3287a80a, 0x00000026, 0x00000496, 0x0b257eb1, 0x754ebd51,
  839. 0x886d935a},
  840. {0xa4db423e, 0x00000023, 0x0000045d, 0x9b3a66dc, 0x873e9f11,
  841. 0xeaaeaeb2},
  842. {0x7a1078df, 0x00000015, 0x0000014a, 0x8c2484c5, 0x6a628659,
  843. 0x8e900a4b},
  844. {0x6048bd5b, 0x00000006, 0x0000006a, 0x897e3559, 0xac9961af,
  845. 0xd74662b1},
  846. {0xd8f9ea20, 0x0000003d, 0x00000277, 0x60eb905b, 0xed2aaf99,
  847. 0xd26752ba},
  848. {0xea5ec3b4, 0x0000002a, 0x000004fe, 0x869965dc, 0x6c1f833b,
  849. 0x8b1fcd62},
  850. {0x2dfb005d, 0x00000016, 0x00000345, 0x6a3b117e, 0xf05e8521,
  851. 0xf54342fe},
  852. {0x5a214ade, 0x00000020, 0x000005b6, 0x467f70be, 0xcb22ccd3,
  853. 0x5b95b988},
  854. {0xf0ab9cca, 0x00000032, 0x00000515, 0xed223df3, 0x7f3ef01d,
  855. 0x2e1176be},
  856. {0x91b444f9, 0x0000002e, 0x000007f8, 0x84e9a983, 0x5676756f,
  857. 0x66120546},
  858. {0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xba638c4c, 0x3f42047b,
  859. 0xf256a5cc},
  860. {0xd824d1bb, 0x0000003a, 0x000007b5, 0x6288653b, 0x3a3ebea0,
  861. 0x4af1dd69},
  862. {0x0470180c, 0x00000034, 0x000001f0, 0x9d5b80d6, 0x3de08195,
  863. 0x56f0a04a},
  864. {0xffaa3a3f, 0x00000036, 0x00000299, 0xf3a82ab8, 0x53e0c13d,
  865. 0x74f6b6b2},
  866. {0x6406cfeb, 0x00000023, 0x00000600, 0xa920b8e8, 0xe4e2acf4,
  867. 0x085951fd},
  868. {0xb24aaa38, 0x0000003e, 0x000004a1, 0x657cc328, 0x5077b2c3,
  869. 0xc65387eb},
  870. {0x58b2ab7c, 0x00000039, 0x000002b4, 0x3a17ee7e, 0x9dcb3643,
  871. 0x1ca9257b},
  872. {0x3db85970, 0x00000006, 0x000002b6, 0x95268b59, 0xb9812c10,
  873. 0xfd196d76},
  874. {0x857830c5, 0x00000003, 0x00000590, 0x4ef439d5, 0xf042161d,
  875. 0x5ef88339},
  876. {0xe1fcd978, 0x0000003e, 0x000007d8, 0xae8d8699, 0xce0a1ef5,
  877. 0x2c3714d9},
  878. {0xb982a768, 0x00000016, 0x000006e0, 0x62fad3df, 0x5f8a067b,
  879. 0x58576548},
  880. {0x1d581ce8, 0x0000001e, 0x0000058b, 0xf0f5da53, 0x26e39eee,
  881. 0xfd7c57de},
  882. {0x2456719b, 0x00000025, 0x00000503, 0x4296ac64, 0xd50e4c14,
  883. 0xd5fedd59},
  884. {0xfae6d8f2, 0x00000000, 0x0000055d, 0x057fdf2e, 0x2a31391a,
  885. 0x1cc3b17b},
  886. {0xcba828e3, 0x00000039, 0x000002ce, 0xe3f22351, 0x8f00877b,
  887. 0x270eed73},
  888. {0x13d25952, 0x0000000a, 0x0000072d, 0x76d4b4cc, 0x5eb67ec3,
  889. 0x91ecbb11},
  890. {0x0342be3f, 0x00000015, 0x00000599, 0xec75d9f1, 0x9d4d2826,
  891. 0x05ed8d0c},
  892. {0xeaa344e0, 0x00000014, 0x000004d8, 0x72a4c981, 0x2064ea06,
  893. 0x0b09ad5b},
  894. {0xbbb52021, 0x0000003b, 0x00000272, 0x04af99fc, 0xaf042d35,
  895. 0xf8d511fb},
  896. {0xb66384dc, 0x0000001d, 0x000007fc, 0xd7629116, 0x782bd801,
  897. 0x5ad832cc},
  898. {0x616c01b6, 0x00000022, 0x000002c8, 0x5b1dab30, 0x783ce7d2,
  899. 0x1214d196},
  900. {0xce2bdaad, 0x00000016, 0x0000062a, 0x932535c8, 0x3f02926d,
  901. 0x5747218a},
  902. {0x00fe84d7, 0x00000005, 0x00000205, 0x850e50aa, 0x753d649c,
  903. 0xde8f14de},
  904. {0xbebdcb4c, 0x00000006, 0x0000055d, 0xbeaa37a2, 0x2d8c9eba,
  905. 0x3563b7b9},
  906. {0xd8b1a02a, 0x00000010, 0x00000387, 0x5017d2fc, 0x503541a5,
  907. 0x071475d0},
  908. {0x3b96cad2, 0x00000036, 0x00000347, 0x1d2372ae, 0x926cd90b,
  909. 0x54c79d60},
  910. {0xc94c1ed7, 0x00000005, 0x0000038b, 0x9e9fdb22, 0x144a9178,
  911. 0x4c53eee6},
  912. {0x1aad454e, 0x00000025, 0x000002b2, 0xc3f6315c, 0x5c7a35b3,
  913. 0x10137a3c},
  914. {0xa4fec9a6, 0x00000000, 0x000006d6, 0x90be5080, 0xa4107605,
  915. 0xaa9d6c73},
  916. {0x1bbe71e2, 0x0000001f, 0x000002fd, 0x4e504c3b, 0x284ccaf1,
  917. 0xb63d23e7},
  918. {0x4201c7e4, 0x00000002, 0x000002b7, 0x7822e3f9, 0x0cc912a9,
  919. 0x7f53e9cf},
  920. {0x23fddc96, 0x00000003, 0x00000627, 0x8a385125, 0x07767e78,
  921. 0x13c1cd83},
  922. {0xd82ba25c, 0x00000016, 0x0000063e, 0x98e4148a, 0x283330c9,
  923. 0x49ff5867},
  924. {0x786f2032, 0x0000002d, 0x0000060f, 0xf201600a, 0xf561bfcd,
  925. 0x8467f211},
  926. {0xfebe4e1f, 0x0000002a, 0x000004f2, 0x95e51961, 0xfd80dcab,
  927. 0x3f9683b2},
  928. {0x1a6e0a39, 0x00000008, 0x00000672, 0x8af6c2a5, 0x78dd84cb,
  929. 0x76a3f874},
  930. {0x56000ab8, 0x0000000e, 0x000000e5, 0x36bacb8f, 0x22ee1f77,
  931. 0x863b702f},
  932. {0x4717fe0c, 0x00000000, 0x000006ec, 0x8439f342, 0x5c8e03da,
  933. 0xdc6c58ff},
  934. {0xd5d5d68e, 0x0000003c, 0x000003a3, 0x46fff083, 0x177d1b39,
  935. 0x0622cc95},
  936. {0xc25dd6c6, 0x00000024, 0x000006c0, 0x5ceb8eb4, 0x892b0d16,
  937. 0xe85605cd},
  938. {0xe9b11300, 0x00000023, 0x00000683, 0x07a5d59a, 0x6c6a3208,
  939. 0x31da5f06},
  940. {0x95cd285e, 0x00000001, 0x00000047, 0x7b3a4368, 0x0202c07e,
  941. 0xa1f2e784},
  942. {0xd9245a25, 0x0000001e, 0x000003a6, 0xd33c1841, 0x1936c0d5,
  943. 0xb07cc616},
  944. {0x103279db, 0x00000006, 0x0000039b, 0xca09b8a0, 0x77d62892,
  945. 0xbf943b6c},
  946. {0x1cba3172, 0x00000027, 0x000001c8, 0xcb377194, 0xebe682db,
  947. 0x2c01af1c},
  948. {0x8f613739, 0x0000000c, 0x000001df, 0xb4b0bc87, 0x7710bd43,
  949. 0x0fe5f56d},
  950. {0x1c6aa90d, 0x0000001b, 0x0000053c, 0x70559245, 0xda7894ac,
  951. 0xf8943b2d},
  952. {0xaabe5b93, 0x0000003d, 0x00000715, 0xcdbf42fa, 0x0c3b99e7,
  953. 0xe4d89272},
  954. {0xf15dd038, 0x00000006, 0x000006db, 0x6e104aea, 0x8d5967f2,
  955. 0x7c2f6bbb},
  956. {0x584dd49c, 0x00000020, 0x000007bc, 0x36b6cfd6, 0xad4e23b2,
  957. 0xabbf388b},
  958. {0x5d8c9506, 0x00000020, 0x00000470, 0x4c62378e, 0x31d92640,
  959. 0x1dca1f4e},
  960. {0xb80d17b0, 0x00000032, 0x00000346, 0x22a5bb88, 0x9a7ec89f,
  961. 0x5c170e23},
  962. {0xdaf0592e, 0x00000023, 0x000007b0, 0x3cab3f99, 0x9b1fdd99,
  963. 0xc0e9d672},
  964. {0x4793cc85, 0x0000000d, 0x00000706, 0xe82e04f6, 0xed3db6b7,
  965. 0xc18bdc86},
  966. {0x82ebf64e, 0x00000009, 0x000007c3, 0x69d590a9, 0x9efa8499,
  967. 0xa874fcdd},
  968. {0xb18a0319, 0x00000026, 0x000007db, 0x1cf98dcc, 0x8fa9ad6a,
  969. 0x9dc0bb48},
  970. };
  971. #include <linux/time.h>
  972. static int __init crc32c_test(void)
  973. {
  974. int i;
  975. int errors = 0;
  976. int bytes = 0;
  977. struct timespec start, stop;
  978. u64 nsec;
  979. unsigned long flags;
  980. /* keep static to prevent cache warming code from
  981. * getting eliminated by the compiler */
  982. static u32 crc;
  983. /* pre-warm the cache */
  984. for (i = 0; i < 100; i++) {
  985. bytes += 2*test[i].length;
  986. crc ^= __crc32c_le(test[i].crc, test_buf +
  987. test[i].start, test[i].length);
  988. }
  989. /* reduce OS noise */
  990. local_irq_save(flags);
  991. local_irq_disable();
  992. getnstimeofday(&start);
  993. for (i = 0; i < 100; i++) {
  994. if (test[i].crc32c_le != __crc32c_le(test[i].crc, test_buf +
  995. test[i].start, test[i].length))
  996. errors++;
  997. }
  998. getnstimeofday(&stop);
  999. local_irq_restore(flags);
  1000. local_irq_enable();
  1001. nsec = stop.tv_nsec - start.tv_nsec +
  1002. 1000000000 * (stop.tv_sec - start.tv_sec);
  1003. pr_info("crc32c: CRC_LE_BITS = %d\n", CRC_LE_BITS);
  1004. if (errors)
  1005. pr_warn("crc32c: %d self tests failed\n", errors);
  1006. else {
  1007. pr_info("crc32c: self tests passed, processed %d bytes in %lld nsec\n",
  1008. bytes, nsec);
  1009. }
  1010. return 0;
  1011. }
  1012. static int __init crc32_test(void)
  1013. {
  1014. int i;
  1015. int errors = 0;
  1016. int bytes = 0;
  1017. struct timespec start, stop;
  1018. u64 nsec;
  1019. unsigned long flags;
  1020. /* keep static to prevent cache warming code from
  1021. * getting eliminated by the compiler */
  1022. static u32 crc;
  1023. /* pre-warm the cache */
  1024. for (i = 0; i < 100; i++) {
  1025. bytes += 2*test[i].length;
  1026. crc ^= crc32_le(test[i].crc, test_buf +
  1027. test[i].start, test[i].length);
  1028. crc ^= crc32_be(test[i].crc, test_buf +
  1029. test[i].start, test[i].length);
  1030. }
  1031. /* reduce OS noise */
  1032. local_irq_save(flags);
  1033. local_irq_disable();
  1034. getnstimeofday(&start);
  1035. for (i = 0; i < 100; i++) {
  1036. if (test[i].crc_le != crc32_le(test[i].crc, test_buf +
  1037. test[i].start, test[i].length))
  1038. errors++;
  1039. if (test[i].crc_be != crc32_be(test[i].crc, test_buf +
  1040. test[i].start, test[i].length))
  1041. errors++;
  1042. }
  1043. getnstimeofday(&stop);
  1044. local_irq_restore(flags);
  1045. local_irq_enable();
  1046. nsec = stop.tv_nsec - start.tv_nsec +
  1047. 1000000000 * (stop.tv_sec - start.tv_sec);
  1048. pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n",
  1049. CRC_LE_BITS, CRC_BE_BITS);
  1050. if (errors)
  1051. pr_warn("crc32: %d self tests failed\n", errors);
  1052. else {
  1053. pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n",
  1054. bytes, nsec);
  1055. }
  1056. return 0;
  1057. }
  1058. static int __init crc32test_init(void)
  1059. {
  1060. crc32_test();
  1061. crc32c_test();
  1062. return 0;
  1063. }
  1064. static void __exit crc32_exit(void)
  1065. {
  1066. }
  1067. module_init(crc32test_init);
  1068. module_exit(crc32_exit);
  1069. #endif /* CONFIG_CRC32_SELFTEST */