linux-vybrid_public/include/asm-x86/nops.h

#ifndef _ASM_NOPS_H
#define _ASM_NOPS_H 1

/* Define nops for use with alternative() */

/* generic versions from gas */
#define GENERIC_NOP1	".byte 0x90\n"
#define GENERIC_NOP2    	".byte 0x89,0xf6\n"
#define GENERIC_NOP3        ".byte 0x8d,0x76,0x00\n"
#define GENERIC_NOP4        ".byte 0x8d,0x74,0x26,0x00\n"
#define GENERIC_NOP5        GENERIC_NOP1 GENERIC_NOP4
#define GENERIC_NOP6	".byte 0x8d,0xb6,0x00,0x00,0x00,0x00\n"
#define GENERIC_NOP7	".byte 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00\n"
#define GENERIC_NOP8	GENERIC_NOP1 GENERIC_NOP7

/* Opteron 64bit nops */
#define K8_NOP1 GENERIC_NOP1
#define K8_NOP2	".byte 0x66,0x90\n"
#define K8_NOP3	".byte 0x66,0x66,0x90\n"
#define K8_NOP4	".byte 0x66,0x66,0x66,0x90\n"
#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

/* K7 nops */
/* uses eax dependencies (arbitary choice) */
#define K7_NOP1  GENERIC_NOP1
#define K7_NOP2	".byte 0x8b,0xc0\n"
#define K7_NOP3	".byte 0x8d,0x04,0x20\n"
#define K7_NOP4	".byte 0x8d,0x44,0x20,0x00\n"
#define K7_NOP5	K7_NOP4 ASM_NOP1
#define K7_NOP6	".byte 0x8d,0x80,0,0,0,0\n"
#define K7_NOP7        ".byte 0x8D,0x04,0x05,0,0,0,0\n"
#define K7_NOP8        K7_NOP7 ASM_NOP1

/* P6 nops */
/* uses eax dependencies (Intel-recommended choice) */
#define P6_NOP1	GENERIC_NOP1
#define P6_NOP2	".byte 0x66,0x90\n"
#define P6_NOP3	".byte 0x0f,0x1f,0x00\n"
#define P6_NOP4	".byte 0x0f,0x1f,0x40,0\n"
#define P6_NOP5	".byte 0x0f,0x1f,0x44,0x00,0\n"
#define P6_NOP6	".byte 0x66,0x0f,0x1f,0x44,0x00,0\n"
#define P6_NOP7	".byte 0x0f,0x1f,0x80,0,0,0,0\n"
#define P6_NOP8	".byte 0x0f,0x1f,0x84,0x00,0,0,0,0\n"

#if defined(CONFIG_MK8)
#define ASM_NOP1 K8_NOP1
#define ASM_NOP2 K8_NOP2
#define ASM_NOP3 K8_NOP3
#define ASM_NOP4 K8_NOP4
#define ASM_NOP5 K8_NOP5
#define ASM_NOP6 K8_NOP6
#define ASM_NOP7 K8_NOP7
#define ASM_NOP8 K8_NOP8
#elif defined(CONFIG_MK7)
#define ASM_NOP1 K7_NOP1
#define ASM_NOP2 K7_NOP2
#define ASM_NOP3 K7_NOP3
#define ASM_NOP4 K7_NOP4
#define ASM_NOP5 K7_NOP5
#define ASM_NOP6 K7_NOP6
#define ASM_NOP7 K7_NOP7
#define ASM_NOP8 K7_NOP8
#elif defined(CONFIG_M686) || defined(CONFIG_MPENTIUMII) || \
      defined(CONFIG_MPENTIUMIII) || defined(CONFIG_MPENTIUMM) || \
      defined(CONFIG_MCORE2) || defined(CONFIG_PENTIUM4)
#define ASM_NOP1 P6_NOP1
#define ASM_NOP2 P6_NOP2
#define ASM_NOP3 P6_NOP3
#define ASM_NOP4 P6_NOP4
#define ASM_NOP5 P6_NOP5
#define ASM_NOP6 P6_NOP6
#define ASM_NOP7 P6_NOP7
#define ASM_NOP8 P6_NOP8
#else
#define ASM_NOP1 GENERIC_NOP1
#define ASM_NOP2 GENERIC_NOP2
#define ASM_NOP3 GENERIC_NOP3
#define ASM_NOP4 GENERIC_NOP4
#define ASM_NOP5 GENERIC_NOP5
#define ASM_NOP6 GENERIC_NOP6
#define ASM_NOP7 GENERIC_NOP7
#define ASM_NOP8 GENERIC_NOP8
#endif

#define ASM_NOP_MAX 8

#endif