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  1. #ifndef _ASM_X86_NOPS_H
  2. #define _ASM_X86_NOPS_H
  3.  
  4. /*
  5.  * Define nops for use with alternative() and for tracing.
  6.  *
  7.  * *_NOP5_ATOMIC must be a single instruction.
  8.  */
  9.  
  10. #define NOP_DS_PREFIX 0x3e
  11.  
  12. /* generic versions from gas
  13.    1: nop
  14.    the following instructions are NOT nops in 64-bit mode,
  15.    for 64-bit mode use K8 or P6 nops instead
  16.    2: movl %esi,%esi
  17.    3: leal 0x00(%esi),%esi
  18.    4: leal 0x00(,%esi,1),%esi
  19.    6: leal 0x00000000(%esi),%esi
  20.    7: leal 0x00000000(,%esi,1),%esi
  21. */
  22. #define GENERIC_NOP1 0x90
  23. #define GENERIC_NOP2 0x89,0xf6
  24. #define GENERIC_NOP3 0x8d,0x76,0x00
  25. #define GENERIC_NOP4 0x8d,0x74,0x26,0x00
  26. #define GENERIC_NOP5 GENERIC_NOP1,GENERIC_NOP4
  27. #define GENERIC_NOP6 0x8d,0xb6,0x00,0x00,0x00,0x00
  28. #define GENERIC_NOP7 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00
  29. #define GENERIC_NOP8 GENERIC_NOP1,GENERIC_NOP7
  30. #define GENERIC_NOP5_ATOMIC NOP_DS_PREFIX,GENERIC_NOP4
  31.  
  32. /* Opteron 64bit nops
  33.    1: nop
  34.    2: osp nop
  35.    3: osp osp nop
  36.    4: osp osp osp nop
  37. */
  38. #define K8_NOP1 GENERIC_NOP1
  39. #define K8_NOP2 0x66,K8_NOP1
  40. #define K8_NOP3 0x66,K8_NOP2
  41. #define K8_NOP4 0x66,K8_NOP3
  42. #define K8_NOP5 K8_NOP3,K8_NOP2
  43. #define K8_NOP6 K8_NOP3,K8_NOP3
  44. #define K8_NOP7 K8_NOP4,K8_NOP3
  45. #define K8_NOP8 K8_NOP4,K8_NOP4
  46. #define K8_NOP5_ATOMIC 0x66,K8_NOP4
  47.  
  48. /* K7 nops
  49.    uses eax dependencies (arbitrary choice)
  50.    1: nop
  51.    2: movl %eax,%eax
  52.    3: leal (,%eax,1),%eax
  53.    4: leal 0x00(,%eax,1),%eax
  54.    6: leal 0x00000000(%eax),%eax
  55.    7: leal 0x00000000(,%eax,1),%eax
  56. */
  57. #define K7_NOP1 GENERIC_NOP1
  58. #define K7_NOP2 0x8b,0xc0
  59. #define K7_NOP3 0x8d,0x04,0x20
  60. #define K7_NOP4 0x8d,0x44,0x20,0x00
  61. #define K7_NOP5 K7_NOP4,K7_NOP1
  62. #define K7_NOP6 0x8d,0x80,0,0,0,0
  63. #define K7_NOP7 0x8D,0x04,0x05,0,0,0,0
  64. #define K7_NOP8 K7_NOP7,K7_NOP1
  65. #define K7_NOP5_ATOMIC NOP_DS_PREFIX,K7_NOP4
  66.  
  67. /* P6 nops
  68.    uses eax dependencies (Intel-recommended choice)
  69.    1: nop
  70.    2: osp nop
  71.    3: nopl (%eax)
  72.    4: nopl 0x00(%eax)
  73.    5: nopl 0x00(%eax,%eax,1)
  74.    6: osp nopl 0x00(%eax,%eax,1)
  75.    7: nopl 0x00000000(%eax)
  76.    8: nopl 0x00000000(%eax,%eax,1)
  77.    Note: All the above are assumed to be a single instruction.
  78.         There is kernel code that depends on this.
  79. */
  80. #define P6_NOP1 GENERIC_NOP1
  81. #define P6_NOP2 0x66,0x90
  82. #define P6_NOP3 0x0f,0x1f,0x00
  83. #define P6_NOP4 0x0f,0x1f,0x40,0
  84. #define P6_NOP5 0x0f,0x1f,0x44,0x00,0
  85. #define P6_NOP6 0x66,0x0f,0x1f,0x44,0x00,0
  86. #define P6_NOP7 0x0f,0x1f,0x80,0,0,0,0
  87. #define P6_NOP8 0x0f,0x1f,0x84,0x00,0,0,0,0
  88. #define P6_NOP5_ATOMIC P6_NOP5
  89.  
  90. #ifdef __ASSEMBLY__
  91. #define _ASM_MK_NOP(x) .byte x
  92. #else
  93. #define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n"
  94. #endif
  95.  
  96. #if defined(CONFIG_MK7)
  97. #define ASM_NOP1 _ASM_MK_NOP(K7_NOP1)
  98. #define ASM_NOP2 _ASM_MK_NOP(K7_NOP2)
  99. #define ASM_NOP3 _ASM_MK_NOP(K7_NOP3)
  100. #define ASM_NOP4 _ASM_MK_NOP(K7_NOP4)
  101. #define ASM_NOP5 _ASM_MK_NOP(K7_NOP5)
  102. #define ASM_NOP6 _ASM_MK_NOP(K7_NOP6)
  103. #define ASM_NOP7 _ASM_MK_NOP(K7_NOP7)
  104. #define ASM_NOP8 _ASM_MK_NOP(K7_NOP8)
  105. #define ASM_NOP5_ATOMIC _ASM_MK_NOP(K7_NOP5_ATOMIC)
  106. #elif defined(CONFIG_X86_P6_NOP)
  107. #define ASM_NOP1 _ASM_MK_NOP(P6_NOP1)
  108. #define ASM_NOP2 _ASM_MK_NOP(P6_NOP2)
  109. #define ASM_NOP3 _ASM_MK_NOP(P6_NOP3)
  110. #define ASM_NOP4 _ASM_MK_NOP(P6_NOP4)
  111. #define ASM_NOP5 _ASM_MK_NOP(P6_NOP5)
  112. #define ASM_NOP6 _ASM_MK_NOP(P6_NOP6)
  113. #define ASM_NOP7 _ASM_MK_NOP(P6_NOP7)
  114. #define ASM_NOP8 _ASM_MK_NOP(P6_NOP8)
  115. #define ASM_NOP5_ATOMIC _ASM_MK_NOP(P6_NOP5_ATOMIC)
  116. #elif defined(CONFIG_X86_64)
  117. #define ASM_NOP1 _ASM_MK_NOP(K8_NOP1)
  118. #define ASM_NOP2 _ASM_MK_NOP(K8_NOP2)
  119. #define ASM_NOP3 _ASM_MK_NOP(K8_NOP3)
  120. #define ASM_NOP4 _ASM_MK_NOP(K8_NOP4)
  121. #define ASM_NOP5 _ASM_MK_NOP(K8_NOP5)
  122. #define ASM_NOP6 _ASM_MK_NOP(K8_NOP6)
  123. #define ASM_NOP7 _ASM_MK_NOP(K8_NOP7)
  124. #define ASM_NOP8 _ASM_MK_NOP(K8_NOP8)
  125. #define ASM_NOP5_ATOMIC _ASM_MK_NOP(K8_NOP5_ATOMIC)
  126. #else
  127. #define ASM_NOP1 _ASM_MK_NOP(GENERIC_NOP1)
  128. #define ASM_NOP2 _ASM_MK_NOP(GENERIC_NOP2)
  129. #define ASM_NOP3 _ASM_MK_NOP(GENERIC_NOP3)
  130. #define ASM_NOP4 _ASM_MK_NOP(GENERIC_NOP4)
  131. #define ASM_NOP5 _ASM_MK_NOP(GENERIC_NOP5)
  132. #define ASM_NOP6 _ASM_MK_NOP(GENERIC_NOP6)
  133. #define ASM_NOP7 _ASM_MK_NOP(GENERIC_NOP7)
  134. #define ASM_NOP8 _ASM_MK_NOP(GENERIC_NOP8)
  135. #define ASM_NOP5_ATOMIC _ASM_MK_NOP(GENERIC_NOP5_ATOMIC)
  136. #endif
  137.  
  138. #define ASM_NOP_MAX 8
  139. #define NOP_ATOMIC5 (ASM_NOP_MAX+1)     /* Entry for the 5-byte atomic NOP */
  140.  
  141. #ifndef __ASSEMBLY__
  142. extern const unsigned char * const *ideal_nops;
  143. extern void arch_init_ideal_nops(void);
  144. #endif
  145.  
  146. #endif /* _ASM_X86_NOPS_H */
  147.