#ifndef _ASM_X86_NOPS_H
  #define _ASM_X86_NOPS_H

  /*
   * Define nops for use with alternative() and for tracing.
   *
   * *_NOP5_ATOMIC must be a single instruction.
   */
  
  #define NOP_DS_PREFIX 0x3e

  /* generic versions from gas
     1: nop

     the following instructions are NOT nops in 64-bit mode,
     for 64-bit mode use K8 or P6 nops instead

     2: movl %esi,%esi
     3: leal 0x00(%esi),%esi
     4: leal 0x00(,%esi,1),%esi
     6: leal 0x00000000(%esi),%esi
     7: leal 0x00000000(,%esi,1),%esi
  */

  #define GENERIC_NOP1 0x90
  #define GENERIC_NOP2 0x89,0xf6
  #define GENERIC_NOP3 0x8d,0x76,0x00
  #define GENERIC_NOP4 0x8d,0x74,0x26,0x00
  #define GENERIC_NOP5 GENERIC_NOP1,GENERIC_NOP4
  #define GENERIC_NOP6 0x8d,0xb6,0x00,0x00,0x00,0x00
  #define GENERIC_NOP7 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00
  #define GENERIC_NOP8 GENERIC_NOP1,GENERIC_NOP7
  #define GENERIC_NOP5_ATOMIC NOP_DS_PREFIX,GENERIC_NOP4

  /* Opteron 64bit nops
     1: nop
     2: osp nop
     3: osp osp nop
     4: osp osp osp nop
  */

  #define K8_NOP1 GENERIC_NOP1

  #define K8_NOP2	0x66,K8_NOP1
  #define K8_NOP3	0x66,K8_NOP2
  #define K8_NOP4	0x66,K8_NOP3
  #define K8_NOP5	K8_NOP3,K8_NOP2
  #define K8_NOP6	K8_NOP3,K8_NOP3
  #define K8_NOP7	K8_NOP4,K8_NOP3
  #define K8_NOP8	K8_NOP4,K8_NOP4
  #define K8_NOP5_ATOMIC 0x66,K8_NOP4

  /* K7 nops

     uses eax dependencies (arbitrary choice)

     1: nop
     2: movl %eax,%eax
     3: leal (,%eax,1),%eax
     4: leal 0x00(,%eax,1),%eax
     6: leal 0x00000000(%eax),%eax
     7: leal 0x00000000(,%eax,1),%eax
  */
  #define K7_NOP1	GENERIC_NOP1

  #define K7_NOP2	0x8b,0xc0
  #define K7_NOP3	0x8d,0x04,0x20
  #define K7_NOP4	0x8d,0x44,0x20,0x00
  #define K7_NOP5	K7_NOP4,K7_NOP1
  #define K7_NOP6	0x8d,0x80,0,0,0,0
  #define K7_NOP7	0x8D,0x04,0x05,0,0,0,0
  #define K7_NOP8	K7_NOP7,K7_NOP1
  #define K7_NOP5_ATOMIC NOP_DS_PREFIX,K7_NOP4

  /* P6 nops
     uses eax dependencies (Intel-recommended choice)
     1: nop
     2: osp nop
     3: nopl (%eax)
     4: nopl 0x00(%eax)
     5: nopl 0x00(%eax,%eax,1)
     6: osp nopl 0x00(%eax,%eax,1)
     7: nopl 0x00000000(%eax)
     8: nopl 0x00000000(%eax,%eax,1)

     Note: All the above are assumed to be a single instruction.
  	There is kernel code that depends on this.

  */

  #define P6_NOP1	GENERIC_NOP1

  #define P6_NOP2	0x66,0x90
  #define P6_NOP3	0x0f,0x1f,0x00
  #define P6_NOP4	0x0f,0x1f,0x40,0
  #define P6_NOP5	0x0f,0x1f,0x44,0x00,0
  #define P6_NOP6	0x66,0x0f,0x1f,0x44,0x00,0
  #define P6_NOP7	0x0f,0x1f,0x80,0,0,0,0
  #define P6_NOP8	0x0f,0x1f,0x84,0x00,0,0,0,0
  #define P6_NOP5_ATOMIC P6_NOP5
  
  #define _ASM_MK_NOP(x) ".byte " __stringify(x) "
  "

  #if defined(CONFIG_MK7)

  #define ASM_NOP1 _ASM_MK_NOP(K7_NOP1)
  #define ASM_NOP2 _ASM_MK_NOP(K7_NOP2)
  #define ASM_NOP3 _ASM_MK_NOP(K7_NOP3)
  #define ASM_NOP4 _ASM_MK_NOP(K7_NOP4)
  #define ASM_NOP5 _ASM_MK_NOP(K7_NOP5)
  #define ASM_NOP6 _ASM_MK_NOP(K7_NOP6)
  #define ASM_NOP7 _ASM_MK_NOP(K7_NOP7)
  #define ASM_NOP8 _ASM_MK_NOP(K7_NOP8)
  #define ASM_NOP5_ATOMIC _ASM_MK_NOP(K7_NOP5_ATOMIC)

  #elif defined(CONFIG_X86_P6_NOP)

  #define ASM_NOP1 _ASM_MK_NOP(P6_NOP1)
  #define ASM_NOP2 _ASM_MK_NOP(P6_NOP2)
  #define ASM_NOP3 _ASM_MK_NOP(P6_NOP3)
  #define ASM_NOP4 _ASM_MK_NOP(P6_NOP4)
  #define ASM_NOP5 _ASM_MK_NOP(P6_NOP5)
  #define ASM_NOP6 _ASM_MK_NOP(P6_NOP6)
  #define ASM_NOP7 _ASM_MK_NOP(P6_NOP7)
  #define ASM_NOP8 _ASM_MK_NOP(P6_NOP8)
  #define ASM_NOP5_ATOMIC _ASM_MK_NOP(P6_NOP5_ATOMIC)

  #elif defined(CONFIG_X86_64)

  #define ASM_NOP1 _ASM_MK_NOP(K8_NOP1)
  #define ASM_NOP2 _ASM_MK_NOP(K8_NOP2)
  #define ASM_NOP3 _ASM_MK_NOP(K8_NOP3)
  #define ASM_NOP4 _ASM_MK_NOP(K8_NOP4)
  #define ASM_NOP5 _ASM_MK_NOP(K8_NOP5)
  #define ASM_NOP6 _ASM_MK_NOP(K8_NOP6)
  #define ASM_NOP7 _ASM_MK_NOP(K8_NOP7)
  #define ASM_NOP8 _ASM_MK_NOP(K8_NOP8)
  #define ASM_NOP5_ATOMIC _ASM_MK_NOP(K8_NOP5_ATOMIC)

  #else

  #define ASM_NOP1 _ASM_MK_NOP(GENERIC_NOP1)
  #define ASM_NOP2 _ASM_MK_NOP(GENERIC_NOP2)
  #define ASM_NOP3 _ASM_MK_NOP(GENERIC_NOP3)
  #define ASM_NOP4 _ASM_MK_NOP(GENERIC_NOP4)
  #define ASM_NOP5 _ASM_MK_NOP(GENERIC_NOP5)
  #define ASM_NOP6 _ASM_MK_NOP(GENERIC_NOP6)
  #define ASM_NOP7 _ASM_MK_NOP(GENERIC_NOP7)
  #define ASM_NOP8 _ASM_MK_NOP(GENERIC_NOP8)
  #define ASM_NOP5_ATOMIC _ASM_MK_NOP(GENERIC_NOP5_ATOMIC)

  #endif
  
  #define ASM_NOP_MAX 8

  #define NOP_ATOMIC5 (ASM_NOP_MAX+1)	/* Entry for the 5-byte atomic NOP */
  
  #ifndef __ASSEMBLY__
  extern const unsigned char * const *ideal_nops;
  extern void arch_init_ideal_nops(void);
  #endif

  #endif /* _ASM_X86_NOPS_H */