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/crc32poly.h>
  29. #include <linux/module.h>
  30. #include <linux/types.h>
  31. #include "crc32defs.h"
  32. #if CRC_LE_BITS > 8
  33. # define tole(x) ((__force u32) __constant_cpu_to_le32(x))
  34. #else
  35. # define tole(x) (x)
  36. #endif
  37. #if CRC_BE_BITS > 8
  38. # define tobe(x) ((__force u32) __constant_cpu_to_be32(x))
  39. #else
  40. # define tobe(x) (x)
  41. #endif
  42. #include "crc32table.h"
  43. MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>");
  44. MODULE_DESCRIPTION("Various CRC32 calculations");
  45. MODULE_LICENSE("GPL");
  46. #if CRC_LE_BITS > 8 || CRC_BE_BITS > 8
  47. /* implements slicing-by-4 or slicing-by-8 algorithm */
  48. static inline u32
  49. crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
  50. {
  51. # ifdef __LITTLE_ENDIAN
  52. # define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8)
  53. # define DO_CRC4 (t3[(q) & 255] ^ t2[(q >> 8) & 255] ^ \
  54. t1[(q >> 16) & 255] ^ t0[(q >> 24) & 255])
  55. # define DO_CRC8 (t7[(q) & 255] ^ t6[(q >> 8) & 255] ^ \
  56. t5[(q >> 16) & 255] ^ t4[(q >> 24) & 255])
  57. # else
  58. # define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
  59. # define DO_CRC4 (t0[(q) & 255] ^ t1[(q >> 8) & 255] ^ \
  60. t2[(q >> 16) & 255] ^ t3[(q >> 24) & 255])
  61. # define DO_CRC8 (t4[(q) & 255] ^ t5[(q >> 8) & 255] ^ \
  62. t6[(q >> 16) & 255] ^ t7[(q >> 24) & 255])
  63. # endif
  64. const u32 *b;
  65. size_t rem_len;
  66. # ifdef CONFIG_X86
  67. size_t i;
  68. # endif
  69. const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3];
  70. # if CRC_LE_BITS != 32
  71. const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7];
  72. # endif
  73. u32 q;
  74. /* Align it */
  75. if (unlikely((long)buf & 3 && len)) {
  76. do {
  77. DO_CRC(*buf++);
  78. } while ((--len) && ((long)buf)&3);
  79. }
  80. # if CRC_LE_BITS == 32
  81. rem_len = len & 3;
  82. len = len >> 2;
  83. # else
  84. rem_len = len & 7;
  85. len = len >> 3;
  86. # endif
  87. b = (const u32 *)buf;
  88. # ifdef CONFIG_X86
  89. --b;
  90. for (i = 0; i < len; i++) {
  91. # else
  92. for (--b; len; --len) {
  93. # endif
  94. q = crc ^ *++b; /* use pre increment for speed */
  95. # if CRC_LE_BITS == 32
  96. crc = DO_CRC4;
  97. # else
  98. crc = DO_CRC8;
  99. q = *++b;
  100. crc ^= DO_CRC4;
  101. # endif
  102. }
  103. len = rem_len;
  104. /* And the last few bytes */
  105. if (len) {
  106. u8 *p = (u8 *)(b + 1) - 1;
  107. # ifdef CONFIG_X86
  108. for (i = 0; i < len; i++)
  109. DO_CRC(*++p); /* use pre increment for speed */
  110. # else
  111. do {
  112. DO_CRC(*++p); /* use pre increment for speed */
  113. } while (--len);
  114. # endif
  115. }
  116. return crc;
  117. #undef DO_CRC
  118. #undef DO_CRC4
  119. #undef DO_CRC8
  120. }
  121. #endif
  122. /**
  123. * crc32_le() - Calculate bitwise little-endian Ethernet AUTODIN II CRC32
  124. * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for
  125. * other uses, or the previous crc32 value if computing incrementally.
  126. * @p: pointer to buffer over which CRC is run
  127. * @len: length of buffer @p
  128. */
  129. static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p,
  130. size_t len, const u32 (*tab)[256],
  131. u32 polynomial)
  132. {
  133. #if CRC_LE_BITS == 1
  134. int i;
  135. while (len--) {
  136. crc ^= *p++;
  137. for (i = 0; i < 8; i++)
  138. crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0);
  139. }
  140. # elif CRC_LE_BITS == 2
  141. while (len--) {
  142. crc ^= *p++;
  143. crc = (crc >> 2) ^ tab[0][crc & 3];
  144. crc = (crc >> 2) ^ tab[0][crc & 3];
  145. crc = (crc >> 2) ^ tab[0][crc & 3];
  146. crc = (crc >> 2) ^ tab[0][crc & 3];
  147. }
  148. # elif CRC_LE_BITS == 4
  149. while (len--) {
  150. crc ^= *p++;
  151. crc = (crc >> 4) ^ tab[0][crc & 15];
  152. crc = (crc >> 4) ^ tab[0][crc & 15];
  153. }
  154. # elif CRC_LE_BITS == 8
  155. /* aka Sarwate algorithm */
  156. while (len--) {
  157. crc ^= *p++;
  158. crc = (crc >> 8) ^ tab[0][crc & 255];
  159. }
  160. # else
  161. crc = (__force u32) __cpu_to_le32(crc);
  162. crc = crc32_body(crc, p, len, tab);
  163. crc = __le32_to_cpu((__force __le32)crc);
  164. #endif
  165. return crc;
  166. }
  167. #if CRC_LE_BITS == 1
  168. u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
  169. {
  170. return crc32_le_generic(crc, p, len, NULL, CRCPOLY_LE);
  171. }
  172. u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
  173. {
  174. return crc32_le_generic(crc, p, len, NULL, CRC32C_POLY_LE);
  175. }
  176. #else
  177. u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
  178. {
  179. return crc32_le_generic(crc, p, len, crc32table_le, CRCPOLY_LE);
  180. }
  181. u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
  182. {
  183. return crc32_le_generic(crc, p, len, crc32ctable_le, CRC32C_POLY_LE);
  184. }
  185. #endif
  186. EXPORT_SYMBOL(crc32_le);
  187. EXPORT_SYMBOL(__crc32c_le);
  188. /**
  189. * crc32_be() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32
  190. * @crc: seed value for computation. ~0 for Ethernet, sometimes 0 for
  191. * other uses, or the previous crc32 value if computing incrementally.
  192. * @p: pointer to buffer over which CRC is run
  193. * @len: length of buffer @p
  194. */
  195. static inline u32 __pure crc32_be_generic(u32 crc, unsigned char const *p,
  196. size_t len, const u32 (*tab)[256],
  197. u32 polynomial)
  198. {
  199. #if CRC_BE_BITS == 1
  200. int i;
  201. while (len--) {
  202. crc ^= *p++ << 24;
  203. for (i = 0; i < 8; i++)
  204. crc =
  205. (crc << 1) ^ ((crc & 0x80000000) ? polynomial :
  206. 0);
  207. }
  208. # elif CRC_BE_BITS == 2
  209. while (len--) {
  210. crc ^= *p++ << 24;
  211. crc = (crc << 2) ^ tab[0][crc >> 30];
  212. crc = (crc << 2) ^ tab[0][crc >> 30];
  213. crc = (crc << 2) ^ tab[0][crc >> 30];
  214. crc = (crc << 2) ^ tab[0][crc >> 30];
  215. }
  216. # elif CRC_BE_BITS == 4
  217. while (len--) {
  218. crc ^= *p++ << 24;
  219. crc = (crc << 4) ^ tab[0][crc >> 28];
  220. crc = (crc << 4) ^ tab[0][crc >> 28];
  221. }
  222. # elif CRC_BE_BITS == 8
  223. while (len--) {
  224. crc ^= *p++ << 24;
  225. crc = (crc << 8) ^ tab[0][crc >> 24];
  226. }
  227. # else
  228. crc = (__force u32) __cpu_to_be32(crc);
  229. crc = crc32_body(crc, p, len, tab);
  230. crc = __be32_to_cpu((__force __be32)crc);
  231. # endif
  232. return crc;
  233. }
  234. #if CRC_LE_BITS == 1
  235. u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
  236. {
  237. return crc32_be_generic(crc, p, len, NULL, CRCPOLY_BE);
  238. }
  239. #else
  240. u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
  241. {
  242. return crc32_be_generic(crc, p, len, crc32table_be, CRCPOLY_BE);
  243. }
  244. #endif
  245. EXPORT_SYMBOL(crc32_be);
  246. #ifdef CONFIG_CRC32_SELFTEST
  247. /* 4096 random bytes */
  248. static u8 __attribute__((__aligned__(8))) test_buf[] =
  249. {
  250. 0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30,
  251. 0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4,
  252. 0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60,
  253. 0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c,
  254. 0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4,
  255. 0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a,
  256. 0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a,
  257. 0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4,
  258. 0x53, 0x24, 0xc5, 0x8b, 0xce, 0x47, 0xb2, 0xb9,
  259. 0x32, 0xcb, 0xc1, 0xd0, 0x03, 0x57, 0x4e, 0xd4,
  260. 0xe9, 0x3c, 0xa1, 0x63, 0xcf, 0x12, 0x0e, 0xca,
  261. 0xe1, 0x13, 0xd1, 0x93, 0xa6, 0x88, 0x5c, 0x61,
  262. 0x5b, 0xbb, 0xf0, 0x19, 0x46, 0xb4, 0xcf, 0x9e,
  263. 0xb6, 0x6b, 0x4c, 0x3a, 0xcf, 0x60, 0xf9, 0x7a,
  264. 0x8d, 0x07, 0x63, 0xdb, 0x40, 0xe9, 0x0b, 0x6f,
  265. 0xad, 0x97, 0xf1, 0xed, 0xd0, 0x1e, 0x26, 0xfd,
  266. 0xbf, 0xb7, 0xc8, 0x04, 0x94, 0xf8, 0x8b, 0x8c,
  267. 0xf1, 0xab, 0x7a, 0xd4, 0xdd, 0xf3, 0xe8, 0x88,
  268. 0xc3, 0xed, 0x17, 0x8a, 0x9b, 0x40, 0x0d, 0x53,
  269. 0x62, 0x12, 0x03, 0x5f, 0x1b, 0x35, 0x32, 0x1f,
  270. 0xb4, 0x7b, 0x93, 0x78, 0x0d, 0xdb, 0xce, 0xa4,
  271. 0xc0, 0x47, 0xd5, 0xbf, 0x68, 0xe8, 0x5d, 0x74,
  272. 0x8f, 0x8e, 0x75, 0x1c, 0xb2, 0x4f, 0x9a, 0x60,
  273. 0xd1, 0xbe, 0x10, 0xf4, 0x5c, 0xa1, 0x53, 0x09,
  274. 0xa5, 0xe0, 0x09, 0x54, 0x85, 0x5c, 0xdc, 0x07,
  275. 0xe7, 0x21, 0x69, 0x7b, 0x8a, 0xfd, 0x90, 0xf1,
  276. 0x22, 0xd0, 0xb4, 0x36, 0x28, 0xe6, 0xb8, 0x0f,
  277. 0x39, 0xde, 0xc8, 0xf3, 0x86, 0x60, 0x34, 0xd2,
  278. 0x5e, 0xdf, 0xfd, 0xcf, 0x0f, 0xa9, 0x65, 0xf0,
  279. 0xd5, 0x4d, 0x96, 0x40, 0xe3, 0xdf, 0x3f, 0x95,
  280. 0x5a, 0x39, 0x19, 0x93, 0xf4, 0x75, 0xce, 0x22,
  281. 0x00, 0x1c, 0x93, 0xe2, 0x03, 0x66, 0xf4, 0x93,
  282. 0x73, 0x86, 0x81, 0x8e, 0x29, 0x44, 0x48, 0x86,
  283. 0x61, 0x7c, 0x48, 0xa3, 0x43, 0xd2, 0x9c, 0x8d,
  284. 0xd4, 0x95, 0xdd, 0xe1, 0x22, 0x89, 0x3a, 0x40,
  285. 0x4c, 0x1b, 0x8a, 0x04, 0xa8, 0x09, 0x69, 0x8b,
  286. 0xea, 0xc6, 0x55, 0x8e, 0x57, 0xe6, 0x64, 0x35,
  287. 0xf0, 0xc7, 0x16, 0x9f, 0x5d, 0x5e, 0x86, 0x40,
  288. 0x46, 0xbb, 0xe5, 0x45, 0x88, 0xfe, 0xc9, 0x63,
  289. 0x15, 0xfb, 0xf5, 0xbd, 0x71, 0x61, 0xeb, 0x7b,
  290. 0x78, 0x70, 0x07, 0x31, 0x03, 0x9f, 0xb2, 0xc8,
  291. 0xa7, 0xab, 0x47, 0xfd, 0xdf, 0xa0, 0x78, 0x72,
  292. 0xa4, 0x2a, 0xe4, 0xb6, 0xba, 0xc0, 0x1e, 0x86,
  293. 0x71, 0xe6, 0x3d, 0x18, 0x37, 0x70, 0xe6, 0xff,
  294. 0xe0, 0xbc, 0x0b, 0x22, 0xa0, 0x1f, 0xd3, 0xed,
  295. 0xa2, 0x55, 0x39, 0xab, 0xa8, 0x13, 0x73, 0x7c,
  296. 0x3f, 0xb2, 0xd6, 0x19, 0xac, 0xff, 0x99, 0xed,
  297. 0xe8, 0xe6, 0xa6, 0x22, 0xe3, 0x9c, 0xf1, 0x30,
  298. 0xdc, 0x01, 0x0a, 0x56, 0xfa, 0xe4, 0xc9, 0x99,
  299. 0xdd, 0xa8, 0xd8, 0xda, 0x35, 0x51, 0x73, 0xb4,
  300. 0x40, 0x86, 0x85, 0xdb, 0x5c, 0xd5, 0x85, 0x80,
  301. 0x14, 0x9c, 0xfd, 0x98, 0xa9, 0x82, 0xc5, 0x37,
  302. 0xff, 0x32, 0x5d, 0xd0, 0x0b, 0xfa, 0xdc, 0x04,
  303. 0x5e, 0x09, 0xd2, 0xca, 0x17, 0x4b, 0x1a, 0x8e,
  304. 0x15, 0xe1, 0xcc, 0x4e, 0x52, 0x88, 0x35, 0xbd,
  305. 0x48, 0xfe, 0x15, 0xa0, 0x91, 0xfd, 0x7e, 0x6c,
  306. 0x0e, 0x5d, 0x79, 0x1b, 0x81, 0x79, 0xd2, 0x09,
  307. 0x34, 0x70, 0x3d, 0x81, 0xec, 0xf6, 0x24, 0xbb,
  308. 0xfb, 0xf1, 0x7b, 0xdf, 0x54, 0xea, 0x80, 0x9b,
  309. 0xc7, 0x99, 0x9e, 0xbd, 0x16, 0x78, 0x12, 0x53,
  310. 0x5e, 0x01, 0xa7, 0x4e, 0xbd, 0x67, 0xe1, 0x9b,
  311. 0x4c, 0x0e, 0x61, 0x45, 0x97, 0xd2, 0xf0, 0x0f,
  312. 0xfe, 0x15, 0x08, 0xb7, 0x11, 0x4c, 0xe7, 0xff,
  313. 0x81, 0x53, 0xff, 0x91, 0x25, 0x38, 0x7e, 0x40,
  314. 0x94, 0xe5, 0xe0, 0xad, 0xe6, 0xd9, 0x79, 0xb6,
  315. 0x92, 0xc9, 0xfc, 0xde, 0xc3, 0x1a, 0x23, 0xbb,
  316. 0xdd, 0xc8, 0x51, 0x0c, 0x3a, 0x72, 0xfa, 0x73,
  317. 0x6f, 0xb7, 0xee, 0x61, 0x39, 0x03, 0x01, 0x3f,
  318. 0x7f, 0x94, 0x2e, 0x2e, 0xba, 0x3a, 0xbb, 0xb4,
  319. 0xfa, 0x6a, 0x17, 0xfe, 0xea, 0xef, 0x5e, 0x66,
  320. 0x97, 0x3f, 0x32, 0x3d, 0xd7, 0x3e, 0xb1, 0xf1,
  321. 0x6c, 0x14, 0x4c, 0xfd, 0x37, 0xd3, 0x38, 0x80,
  322. 0xfb, 0xde, 0xa6, 0x24, 0x1e, 0xc8, 0xca, 0x7f,
  323. 0x3a, 0x93, 0xd8, 0x8b, 0x18, 0x13, 0xb2, 0xe5,
  324. 0xe4, 0x93, 0x05, 0x53, 0x4f, 0x84, 0x66, 0xa7,
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  739. 0x98, 0xa7, 0x85, 0x74, 0x3b, 0x9d, 0xec, 0x9e,
  740. 0xa9, 0x19, 0x72, 0xa5, 0x7f, 0x2c, 0x39, 0xb7,
  741. 0x7d, 0xb7, 0xf1, 0x12, 0x65, 0x27, 0x4b, 0x5a,
  742. 0xde, 0x17, 0xfe, 0xad, 0x44, 0xf3, 0x20, 0x4d,
  743. 0xfd, 0xe4, 0x1f, 0xb5, 0x81, 0xb0, 0x36, 0x37,
  744. 0x08, 0x6f, 0xc3, 0x0c, 0xe9, 0x85, 0x98, 0x82,
  745. 0xa9, 0x62, 0x0c, 0xc4, 0x97, 0xc0, 0x50, 0xc8,
  746. 0xa7, 0x3c, 0x50, 0x9f, 0x43, 0xb9, 0xcd, 0x5e,
  747. 0x4d, 0xfa, 0x1c, 0x4b, 0x0b, 0xa9, 0x98, 0x85,
  748. 0x38, 0x92, 0xac, 0x8d, 0xe4, 0xad, 0x9b, 0x98,
  749. 0xab, 0xd9, 0x38, 0xac, 0x62, 0x52, 0xa3, 0x22,
  750. 0x63, 0x0f, 0xbf, 0x95, 0x48, 0xdf, 0x69, 0xe7,
  751. 0x8b, 0x33, 0xd5, 0xb2, 0xbd, 0x05, 0x49, 0x49,
  752. 0x9d, 0x57, 0x73, 0x19, 0x33, 0xae, 0xfa, 0x33,
  753. 0xf1, 0x19, 0xa8, 0x80, 0xce, 0x04, 0x9f, 0xbc,
  754. 0x1d, 0x65, 0x82, 0x1b, 0xe5, 0x3a, 0x51, 0xc8,
  755. 0x1c, 0x21, 0xe3, 0x5d, 0xf3, 0x7d, 0x9b, 0x2f,
  756. 0x2c, 0x1d, 0x4a, 0x7f, 0x9b, 0x68, 0x35, 0xa3,
  757. 0xb2, 0x50, 0xf7, 0x62, 0x79, 0xcd, 0xf4, 0x98,
  758. 0x4f, 0xe5, 0x63, 0x7c, 0x3e, 0x45, 0x31, 0x8c,
  759. 0x16, 0xa0, 0x12, 0xc8, 0x58, 0xce, 0x39, 0xa6,
  760. 0xbc, 0x54, 0xdb, 0xc5, 0xe0, 0xd5, 0xba, 0xbc,
  761. 0xb9, 0x04, 0xf4, 0x8d, 0xe8, 0x2f, 0x15, 0x9d,
  762. };
  763. /* 100 test cases */
  764. static struct crc_test {
  765. u32 crc; /* random starting crc */
  766. u32 start; /* random 6 bit offset in buf */
  767. u32 length; /* random 11 bit length of test */
  768. u32 crc_le; /* expected crc32_le result */
  769. u32 crc_be; /* expected crc32_be result */
  770. u32 crc32c_le; /* expected crc32c_le result */
  771. } test[] =
  772. {
  773. {0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1,
  774. 0xf6e93d6c},
  775. {0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad,
  776. 0x0fe92aca},
  777. {0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f,
  778. 0x52e1ebb8},
  779. {0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a,
  780. 0x0798af9a},
  781. {0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2,
  782. 0x18eb3152},
  783. {0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793,
  784. 0xd00d08c7},
  785. {0x292561e8, 0x0000000c, 0x00000403, 0xa2ba8aaf, 0x0b797aed,
  786. 0x8ba966bc},
  787. {0x415037f6, 0x00000003, 0x00000676, 0xa17d52e8, 0x7f0fdf35,
  788. 0x11d694a2},
  789. {0x3466e707, 0x00000026, 0x00000042, 0x258319be, 0x75c484a2,
  790. 0x6ab3208d},
  791. {0xafd1281b, 0x00000023, 0x000002ee, 0x4428eaf8, 0x06c7ad10,
  792. 0xba4603c5},
  793. {0xd3857b18, 0x00000028, 0x000004a2, 0x5c430821, 0xb062b7cb,
  794. 0xe6071c6f},
  795. {0x1d825a8f, 0x0000002b, 0x0000050b, 0xd2c45f0c, 0xd68634e0,
  796. 0x179ec30a},
  797. {0x5033e3bc, 0x0000000b, 0x00000078, 0xa3ea4113, 0xac6d31fb,
  798. 0x0903beb8},
  799. {0x94f1fb5e, 0x0000000f, 0x000003a2, 0xfbfc50b1, 0x3cfe50ed,
  800. 0x6a7cb4fa},
  801. {0xc9a0fe14, 0x00000009, 0x00000473, 0x5fb61894, 0x87070591,
  802. 0xdb535801},
  803. {0x88a034b1, 0x0000001c, 0x000005ad, 0xc1b16053, 0x46f95c67,
  804. 0x92bed597},
  805. {0xf0f72239, 0x00000020, 0x0000026d, 0xa6fa58f3, 0xf8c2c1dd,
  806. 0x192a3f1b},
  807. {0xcc20a5e3, 0x0000003b, 0x0000067a, 0x7740185a, 0x308b979a,
  808. 0xccbaec1a},
  809. {0xce589c95, 0x0000002b, 0x00000641, 0xd055e987, 0x40aae25b,
  810. 0x7eabae4d},
  811. {0x78edc885, 0x00000035, 0x000005be, 0xa39cb14b, 0x035b0d1f,
  812. 0x28c72982},
  813. {0x9d40a377, 0x0000003b, 0x00000038, 0x1f47ccd2, 0x197fbc9d,
  814. 0xc3cd4d18},
  815. {0x703d0e01, 0x0000003c, 0x000006f1, 0x88735e7c, 0xfed57c5a,
  816. 0xbca8f0e7},
  817. {0x776bf505, 0x0000000f, 0x000005b2, 0x5cc4fc01, 0xf32efb97,
  818. 0x713f60b3},
  819. {0x4a3e7854, 0x00000027, 0x000004b8, 0x8d923c82, 0x0cbfb4a2,
  820. 0xebd08fd5},
  821. {0x209172dd, 0x0000003b, 0x00000356, 0xb89e9c2b, 0xd7868138,
  822. 0x64406c59},
  823. {0x3ba4cc5b, 0x0000002f, 0x00000203, 0xe51601a9, 0x5b2a1032,
  824. 0x7421890e},
  825. {0xfc62f297, 0x00000000, 0x00000079, 0x71a8e1a2, 0x5d88685f,
  826. 0xe9347603},
  827. {0x64280b8b, 0x00000016, 0x000007ab, 0x0fa7a30c, 0xda3a455f,
  828. 0x1bef9060},
  829. {0x97dd724b, 0x00000033, 0x000007ad, 0x5788b2f4, 0xd7326d32,
  830. 0x34720072},
  831. {0x61394b52, 0x00000035, 0x00000571, 0xc66525f1, 0xcabe7fef,
  832. 0x48310f59},
  833. {0x29b4faff, 0x00000024, 0x0000006e, 0xca13751e, 0x993648e0,
  834. 0x783a4213},
  835. {0x29bfb1dc, 0x0000000b, 0x00000244, 0x436c43f7, 0x429f7a59,
  836. 0x9e8efd41},
  837. {0x86ae934b, 0x00000035, 0x00000104, 0x0760ec93, 0x9cf7d0f4,
  838. 0xfc3d34a5},
  839. {0xc4c1024e, 0x0000002e, 0x000006b1, 0x6516a3ec, 0x19321f9c,
  840. 0x17a52ae2},
  841. {0x3287a80a, 0x00000026, 0x00000496, 0x0b257eb1, 0x754ebd51,
  842. 0x886d935a},
  843. {0xa4db423e, 0x00000023, 0x0000045d, 0x9b3a66dc, 0x873e9f11,
  844. 0xeaaeaeb2},
  845. {0x7a1078df, 0x00000015, 0x0000014a, 0x8c2484c5, 0x6a628659,
  846. 0x8e900a4b},
  847. {0x6048bd5b, 0x00000006, 0x0000006a, 0x897e3559, 0xac9961af,
  848. 0xd74662b1},
  849. {0xd8f9ea20, 0x0000003d, 0x00000277, 0x60eb905b, 0xed2aaf99,
  850. 0xd26752ba},
  851. {0xea5ec3b4, 0x0000002a, 0x000004fe, 0x869965dc, 0x6c1f833b,
  852. 0x8b1fcd62},
  853. {0x2dfb005d, 0x00000016, 0x00000345, 0x6a3b117e, 0xf05e8521,
  854. 0xf54342fe},
  855. {0x5a214ade, 0x00000020, 0x000005b6, 0x467f70be, 0xcb22ccd3,
  856. 0x5b95b988},
  857. {0xf0ab9cca, 0x00000032, 0x00000515, 0xed223df3, 0x7f3ef01d,
  858. 0x2e1176be},
  859. {0x91b444f9, 0x0000002e, 0x000007f8, 0x84e9a983, 0x5676756f,
  860. 0x66120546},
  861. {0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xba638c4c, 0x3f42047b,
  862. 0xf256a5cc},
  863. {0xd824d1bb, 0x0000003a, 0x000007b5, 0x6288653b, 0x3a3ebea0,
  864. 0x4af1dd69},
  865. {0x0470180c, 0x00000034, 0x000001f0, 0x9d5b80d6, 0x3de08195,
  866. 0x56f0a04a},
  867. {0xffaa3a3f, 0x00000036, 0x00000299, 0xf3a82ab8, 0x53e0c13d,
  868. 0x74f6b6b2},
  869. {0x6406cfeb, 0x00000023, 0x00000600, 0xa920b8e8, 0xe4e2acf4,
  870. 0x085951fd},
  871. {0xb24aaa38, 0x0000003e, 0x000004a1, 0x657cc328, 0x5077b2c3,
  872. 0xc65387eb},
  873. {0x58b2ab7c, 0x00000039, 0x000002b4, 0x3a17ee7e, 0x9dcb3643,
  874. 0x1ca9257b},
  875. {0x3db85970, 0x00000006, 0x000002b6, 0x95268b59, 0xb9812c10,
  876. 0xfd196d76},
  877. {0x857830c5, 0x00000003, 0x00000590, 0x4ef439d5, 0xf042161d,
  878. 0x5ef88339},
  879. {0xe1fcd978, 0x0000003e, 0x000007d8, 0xae8d8699, 0xce0a1ef5,
  880. 0x2c3714d9},
  881. {0xb982a768, 0x00000016, 0x000006e0, 0x62fad3df, 0x5f8a067b,
  882. 0x58576548},
  883. {0x1d581ce8, 0x0000001e, 0x0000058b, 0xf0f5da53, 0x26e39eee,
  884. 0xfd7c57de},
  885. {0x2456719b, 0x00000025, 0x00000503, 0x4296ac64, 0xd50e4c14,
  886. 0xd5fedd59},
  887. {0xfae6d8f2, 0x00000000, 0x0000055d, 0x057fdf2e, 0x2a31391a,
  888. 0x1cc3b17b},
  889. {0xcba828e3, 0x00000039, 0x000002ce, 0xe3f22351, 0x8f00877b,
  890. 0x270eed73},
  891. {0x13d25952, 0x0000000a, 0x0000072d, 0x76d4b4cc, 0x5eb67ec3,
  892. 0x91ecbb11},
  893. {0x0342be3f, 0x00000015, 0x00000599, 0xec75d9f1, 0x9d4d2826,
  894. 0x05ed8d0c},
  895. {0xeaa344e0, 0x00000014, 0x000004d8, 0x72a4c981, 0x2064ea06,
  896. 0x0b09ad5b},
  897. {0xbbb52021, 0x0000003b, 0x00000272, 0x04af99fc, 0xaf042d35,
  898. 0xf8d511fb},
  899. {0xb66384dc, 0x0000001d, 0x000007fc, 0xd7629116, 0x782bd801,
  900. 0x5ad832cc},
  901. {0x616c01b6, 0x00000022, 0x000002c8, 0x5b1dab30, 0x783ce7d2,
  902. 0x1214d196},
  903. {0xce2bdaad, 0x00000016, 0x0000062a, 0x932535c8, 0x3f02926d,
  904. 0x5747218a},
  905. {0x00fe84d7, 0x00000005, 0x00000205, 0x850e50aa, 0x753d649c,
  906. 0xde8f14de},
  907. {0xbebdcb4c, 0x00000006, 0x0000055d, 0xbeaa37a2, 0x2d8c9eba,
  908. 0x3563b7b9},
  909. {0xd8b1a02a, 0x00000010, 0x00000387, 0x5017d2fc, 0x503541a5,
  910. 0x071475d0},
  911. {0x3b96cad2, 0x00000036, 0x00000347, 0x1d2372ae, 0x926cd90b,
  912. 0x54c79d60},
  913. {0xc94c1ed7, 0x00000005, 0x0000038b, 0x9e9fdb22, 0x144a9178,
  914. 0x4c53eee6},
  915. {0x1aad454e, 0x00000025, 0x000002b2, 0xc3f6315c, 0x5c7a35b3,
  916. 0x10137a3c},
  917. {0xa4fec9a6, 0x00000000, 0x000006d6, 0x90be5080, 0xa4107605,
  918. 0xaa9d6c73},
  919. {0x1bbe71e2, 0x0000001f, 0x000002fd, 0x4e504c3b, 0x284ccaf1,
  920. 0xb63d23e7},
  921. {0x4201c7e4, 0x00000002, 0x000002b7, 0x7822e3f9, 0x0cc912a9,
  922. 0x7f53e9cf},
  923. {0x23fddc96, 0x00000003, 0x00000627, 0x8a385125, 0x07767e78,
  924. 0x13c1cd83},
  925. {0xd82ba25c, 0x00000016, 0x0000063e, 0x98e4148a, 0x283330c9,
  926. 0x49ff5867},
  927. {0x786f2032, 0x0000002d, 0x0000060f, 0xf201600a, 0xf561bfcd,
  928. 0x8467f211},
  929. {0xfebe4e1f, 0x0000002a, 0x000004f2, 0x95e51961, 0xfd80dcab,
  930. 0x3f9683b2},
  931. {0x1a6e0a39, 0x00000008, 0x00000672, 0x8af6c2a5, 0x78dd84cb,
  932. 0x76a3f874},
  933. {0x56000ab8, 0x0000000e, 0x000000e5, 0x36bacb8f, 0x22ee1f77,
  934. 0x863b702f},
  935. {0x4717fe0c, 0x00000000, 0x000006ec, 0x8439f342, 0x5c8e03da,
  936. 0xdc6c58ff},
  937. {0xd5d5d68e, 0x0000003c, 0x000003a3, 0x46fff083, 0x177d1b39,
  938. 0x0622cc95},
  939. {0xc25dd6c6, 0x00000024, 0x000006c0, 0x5ceb8eb4, 0x892b0d16,
  940. 0xe85605cd},
  941. {0xe9b11300, 0x00000023, 0x00000683, 0x07a5d59a, 0x6c6a3208,
  942. 0x31da5f06},
  943. {0x95cd285e, 0x00000001, 0x00000047, 0x7b3a4368, 0x0202c07e,
  944. 0xa1f2e784},
  945. {0xd9245a25, 0x0000001e, 0x000003a6, 0xd33c1841, 0x1936c0d5,
  946. 0xb07cc616},
  947. {0x103279db, 0x00000006, 0x0000039b, 0xca09b8a0, 0x77d62892,
  948. 0xbf943b6c},
  949. {0x1cba3172, 0x00000027, 0x000001c8, 0xcb377194, 0xebe682db,
  950. 0x2c01af1c},
  951. {0x8f613739, 0x0000000c, 0x000001df, 0xb4b0bc87, 0x7710bd43,
  952. 0x0fe5f56d},
  953. {0x1c6aa90d, 0x0000001b, 0x0000053c, 0x70559245, 0xda7894ac,
  954. 0xf8943b2d},
  955. {0xaabe5b93, 0x0000003d, 0x00000715, 0xcdbf42fa, 0x0c3b99e7,
  956. 0xe4d89272},
  957. {0xf15dd038, 0x00000006, 0x000006db, 0x6e104aea, 0x8d5967f2,
  958. 0x7c2f6bbb},
  959. {0x584dd49c, 0x00000020, 0x000007bc, 0x36b6cfd6, 0xad4e23b2,
  960. 0xabbf388b},
  961. {0x5d8c9506, 0x00000020, 0x00000470, 0x4c62378e, 0x31d92640,
  962. 0x1dca1f4e},
  963. {0xb80d17b0, 0x00000032, 0x00000346, 0x22a5bb88, 0x9a7ec89f,
  964. 0x5c170e23},
  965. {0xdaf0592e, 0x00000023, 0x000007b0, 0x3cab3f99, 0x9b1fdd99,
  966. 0xc0e9d672},
  967. {0x4793cc85, 0x0000000d, 0x00000706, 0xe82e04f6, 0xed3db6b7,
  968. 0xc18bdc86},
  969. {0x82ebf64e, 0x00000009, 0x000007c3, 0x69d590a9, 0x9efa8499,
  970. 0xa874fcdd},
  971. {0xb18a0319, 0x00000026, 0x000007db, 0x1cf98dcc, 0x8fa9ad6a,
  972. 0x9dc0bb48},
  973. };
  974. #include <linux/time.h>
  975. static int __init crc32c_test(void)
  976. {
  977. int i;
  978. int errors = 0;
  979. int bytes = 0;
  980. struct timespec start, stop;
  981. u64 nsec;
  982. unsigned long flags;
  983. /* keep static to prevent cache warming code from
  984. * getting eliminated by the compiler */
  985. static u32 crc;
  986. /* pre-warm the cache */
  987. for (i = 0; i < 100; i++) {
  988. bytes += 2*test[i].length;
  989. crc ^= __crc32c_le(test[i].crc, test_buf +
  990. test[i].start, test[i].length);
  991. }
  992. /* reduce OS noise */
  993. local_irq_save(flags);
  994. local_irq_disable();
  995. getnstimeofday(&start);
  996. for (i = 0; i < 100; i++) {
  997. if (test[i].crc32c_le != __crc32c_le(test[i].crc, test_buf +
  998. test[i].start, test[i].length))
  999. errors++;
  1000. }
  1001. getnstimeofday(&stop);
  1002. local_irq_restore(flags);
  1003. local_irq_enable();
  1004. nsec = stop.tv_nsec - start.tv_nsec +
  1005. 1000000000 * (stop.tv_sec - start.tv_sec);
  1006. pr_info("crc32c: CRC_LE_BITS = %d\n", CRC_LE_BITS);
  1007. if (errors)
  1008. pr_warn("crc32c: %d self tests failed\n", errors);
  1009. else {
  1010. pr_info("crc32c: self tests passed, processed %d bytes in %lld nsec\n",
  1011. bytes, nsec);
  1012. }
  1013. return 0;
  1014. }
  1015. static int __init crc32_test(void)
  1016. {
  1017. int i;
  1018. int errors = 0;
  1019. int bytes = 0;
  1020. struct timespec start, stop;
  1021. u64 nsec;
  1022. unsigned long flags;
  1023. /* keep static to prevent cache warming code from
  1024. * getting eliminated by the compiler */
  1025. static u32 crc;
  1026. /* pre-warm the cache */
  1027. for (i = 0; i < 100; i++) {
  1028. bytes += 2*test[i].length;
  1029. crc ^= crc32_le(test[i].crc, test_buf +
  1030. test[i].start, test[i].length);
  1031. crc ^= crc32_be(test[i].crc, test_buf +
  1032. test[i].start, test[i].length);
  1033. }
  1034. /* reduce OS noise */
  1035. local_irq_save(flags);
  1036. local_irq_disable();
  1037. getnstimeofday(&start);
  1038. for (i = 0; i < 100; i++) {
  1039. if (test[i].crc_le != crc32_le(test[i].crc, test_buf +
  1040. test[i].start, test[i].length))
  1041. errors++;
  1042. if (test[i].crc_be != crc32_be(test[i].crc, test_buf +
  1043. test[i].start, test[i].length))
  1044. errors++;
  1045. }
  1046. getnstimeofday(&stop);
  1047. local_irq_restore(flags);
  1048. local_irq_enable();
  1049. nsec = stop.tv_nsec - start.tv_nsec +
  1050. 1000000000 * (stop.tv_sec - start.tv_sec);
  1051. pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n",
  1052. CRC_LE_BITS, CRC_BE_BITS);
  1053. if (errors)
  1054. pr_warn("crc32: %d self tests failed\n", errors);
  1055. else {
  1056. pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n",
  1057. bytes, nsec);
  1058. }
  1059. return 0;
  1060. }
  1061. static int __init crc32test_init(void)
  1062. {
  1063. crc32_test();
  1064. crc32c_test();
  1065. return 0;
  1066. }
  1067. static void __exit crc32_exit(void)
  1068. {
  1069. }
  1070. module_init(crc32test_init);
  1071. module_exit(crc32_exit);
  1072. #endif /* CONFIG_CRC32_SELFTEST */