dfltcc_util.h 2.2 KB

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  1. // SPDX-License-Identifier: Zlib
  2. #ifndef DFLTCC_UTIL_H
  3. #define DFLTCC_UTIL_H
  4. #include <linux/zutil.h>
  5. /*
  6. * C wrapper for the DEFLATE CONVERSION CALL instruction.
  7. */
  8. typedef enum {
  9. DFLTCC_CC_OK = 0,
  10. DFLTCC_CC_OP1_TOO_SHORT = 1,
  11. DFLTCC_CC_OP2_TOO_SHORT = 2,
  12. DFLTCC_CC_OP2_CORRUPT = 2,
  13. DFLTCC_CC_AGAIN = 3,
  14. } dfltcc_cc;
  15. #define DFLTCC_QAF 0
  16. #define DFLTCC_GDHT 1
  17. #define DFLTCC_CMPR 2
  18. #define DFLTCC_XPND 4
  19. #define HBT_CIRCULAR (1 << 7)
  20. #define HB_BITS 15
  21. #define HB_SIZE (1 << HB_BITS)
  22. static inline dfltcc_cc dfltcc(
  23. int fn,
  24. void *param,
  25. Byte **op1,
  26. size_t *len1,
  27. const Byte **op2,
  28. size_t *len2,
  29. void *hist
  30. )
  31. {
  32. Byte *t2 = op1 ? *op1 : NULL;
  33. size_t t3 = len1 ? *len1 : 0;
  34. const Byte *t4 = op2 ? *op2 : NULL;
  35. size_t t5 = len2 ? *len2 : 0;
  36. register int r0 __asm__("r0") = fn;
  37. register void *r1 __asm__("r1") = param;
  38. register Byte *r2 __asm__("r2") = t2;
  39. register size_t r3 __asm__("r3") = t3;
  40. register const Byte *r4 __asm__("r4") = t4;
  41. register size_t r5 __asm__("r5") = t5;
  42. int cc;
  43. __asm__ volatile(
  44. ".insn rrf,0xb9390000,%[r2],%[r4],%[hist],0\n"
  45. "ipm %[cc]\n"
  46. : [r2] "+r" (r2)
  47. , [r3] "+r" (r3)
  48. , [r4] "+r" (r4)
  49. , [r5] "+r" (r5)
  50. , [cc] "=r" (cc)
  51. : [r0] "r" (r0)
  52. , [r1] "r" (r1)
  53. , [hist] "r" (hist)
  54. : "cc", "memory");
  55. t2 = r2; t3 = r3; t4 = r4; t5 = r5;
  56. if (op1)
  57. *op1 = t2;
  58. if (len1)
  59. *len1 = t3;
  60. if (op2)
  61. *op2 = t4;
  62. if (len2)
  63. *len2 = t5;
  64. return (cc >> 28) & 3;
  65. }
  66. static inline int is_bit_set(
  67. const char *bits,
  68. int n
  69. )
  70. {
  71. return bits[n / 8] & (1 << (7 - (n % 8)));
  72. }
  73. static inline void turn_bit_off(
  74. char *bits,
  75. int n
  76. )
  77. {
  78. bits[n / 8] &= ~(1 << (7 - (n % 8)));
  79. }
  80. static inline int dfltcc_are_params_ok(
  81. int level,
  82. uInt window_bits,
  83. int strategy,
  84. uLong level_mask
  85. )
  86. {
  87. return (level_mask & (1 << level)) != 0 &&
  88. (window_bits == HB_BITS) &&
  89. (strategy == Z_DEFAULT_STRATEGY);
  90. }
  91. char *oesc_msg(char *buf, int oesc);
  92. #endif /* DFLTCC_UTIL_H */