/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_NOPS_H
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#define _ASM_X86_NOPS_H
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/*
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* Define nops for use with alternative() and for tracing.
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*
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* *_NOP5_ATOMIC must be a single instruction.
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*/
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#define NOP_DS_PREFIX 0x3e
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/* generic versions from gas
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1: nop
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the following instructions are NOT nops in 64-bit mode,
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for 64-bit mode use K8 or P6 nops instead
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2: movl %esi,%esi
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3: leal 0x00(%esi),%esi
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4: leal 0x00(,%esi,1),%esi
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6: leal 0x00000000(%esi),%esi
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7: leal 0x00000000(,%esi,1),%esi
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*/
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#define GENERIC_NOP1 0x90
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#define GENERIC_NOP2 0x89,0xf6
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#define GENERIC_NOP3 0x8d,0x76,0x00
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#define GENERIC_NOP4 0x8d,0x74,0x26,0x00
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#define GENERIC_NOP5 GENERIC_NOP1,GENERIC_NOP4
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#define GENERIC_NOP6 0x8d,0xb6,0x00,0x00,0x00,0x00
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#define GENERIC_NOP7 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00
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#define GENERIC_NOP8 GENERIC_NOP1,GENERIC_NOP7
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#define GENERIC_NOP5_ATOMIC NOP_DS_PREFIX,GENERIC_NOP4
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/* Opteron 64bit nops
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1: nop
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2: osp nop
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3: osp osp nop
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4: osp osp osp nop
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*/
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#define K8_NOP1 GENERIC_NOP1
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#define K8_NOP2 0x66,K8_NOP1
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#define K8_NOP3 0x66,K8_NOP2
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#define K8_NOP4 0x66,K8_NOP3
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#define K8_NOP5 K8_NOP3,K8_NOP2
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#define K8_NOP6 K8_NOP3,K8_NOP3
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#define K8_NOP7 K8_NOP4,K8_NOP3
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#define K8_NOP8 K8_NOP4,K8_NOP4
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#define K8_NOP5_ATOMIC 0x66,K8_NOP4
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/* K7 nops
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uses eax dependencies (arbitrary choice)
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1: nop
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2: movl %eax,%eax
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3: leal (,%eax,1),%eax
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4: leal 0x00(,%eax,1),%eax
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6: leal 0x00000000(%eax),%eax
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7: leal 0x00000000(,%eax,1),%eax
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*/
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#define K7_NOP1 GENERIC_NOP1
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#define K7_NOP2 0x8b,0xc0
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#define K7_NOP3 0x8d,0x04,0x20
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#define K7_NOP4 0x8d,0x44,0x20,0x00
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#define K7_NOP5 K7_NOP4,K7_NOP1
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#define K7_NOP6 0x8d,0x80,0,0,0,0
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#define K7_NOP7 0x8D,0x04,0x05,0,0,0,0
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#define K7_NOP8 K7_NOP7,K7_NOP1
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#define K7_NOP5_ATOMIC NOP_DS_PREFIX,K7_NOP4
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/* P6 nops
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uses eax dependencies (Intel-recommended choice)
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1: nop
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2: osp nop
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3: nopl (%eax)
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4: nopl 0x00(%eax)
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5: nopl 0x00(%eax,%eax,1)
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6: osp nopl 0x00(%eax,%eax,1)
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7: nopl 0x00000000(%eax)
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8: nopl 0x00000000(%eax,%eax,1)
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Note: All the above are assumed to be a single instruction.
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There is kernel code that depends on this.
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*/
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#define P6_NOP1 GENERIC_NOP1
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#define P6_NOP2 0x66,0x90
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#define P6_NOP3 0x0f,0x1f,0x00
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#define P6_NOP4 0x0f,0x1f,0x40,0
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#define P6_NOP5 0x0f,0x1f,0x44,0x00,0
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#define P6_NOP6 0x66,0x0f,0x1f,0x44,0x00,0
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#define P6_NOP7 0x0f,0x1f,0x80,0,0,0,0
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#define P6_NOP8 0x0f,0x1f,0x84,0x00,0,0,0,0
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#define P6_NOP5_ATOMIC P6_NOP5
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#ifdef __ASSEMBLY__
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#define _ASM_MK_NOP(x) .byte x
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#else
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#define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n"
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#endif
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#if defined(CONFIG_MK7)
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#define ASM_NOP1 _ASM_MK_NOP(K7_NOP1)
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#define ASM_NOP2 _ASM_MK_NOP(K7_NOP2)
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#define ASM_NOP3 _ASM_MK_NOP(K7_NOP3)
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#define ASM_NOP4 _ASM_MK_NOP(K7_NOP4)
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#define ASM_NOP5 _ASM_MK_NOP(K7_NOP5)
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#define ASM_NOP6 _ASM_MK_NOP(K7_NOP6)
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#define ASM_NOP7 _ASM_MK_NOP(K7_NOP7)
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#define ASM_NOP8 _ASM_MK_NOP(K7_NOP8)
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#define ASM_NOP5_ATOMIC _ASM_MK_NOP(K7_NOP5_ATOMIC)
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#elif defined(CONFIG_X86_P6_NOP)
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#define ASM_NOP1 _ASM_MK_NOP(P6_NOP1)
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#define ASM_NOP2 _ASM_MK_NOP(P6_NOP2)
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#define ASM_NOP3 _ASM_MK_NOP(P6_NOP3)
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#define ASM_NOP4 _ASM_MK_NOP(P6_NOP4)
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#define ASM_NOP5 _ASM_MK_NOP(P6_NOP5)
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#define ASM_NOP6 _ASM_MK_NOP(P6_NOP6)
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#define ASM_NOP7 _ASM_MK_NOP(P6_NOP7)
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#define ASM_NOP8 _ASM_MK_NOP(P6_NOP8)
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#define ASM_NOP5_ATOMIC _ASM_MK_NOP(P6_NOP5_ATOMIC)
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#elif defined(CONFIG_X86_64)
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#define ASM_NOP1 _ASM_MK_NOP(K8_NOP1)
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#define ASM_NOP2 _ASM_MK_NOP(K8_NOP2)
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#define ASM_NOP3 _ASM_MK_NOP(K8_NOP3)
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#define ASM_NOP4 _ASM_MK_NOP(K8_NOP4)
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#define ASM_NOP5 _ASM_MK_NOP(K8_NOP5)
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#define ASM_NOP6 _ASM_MK_NOP(K8_NOP6)
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#define ASM_NOP7 _ASM_MK_NOP(K8_NOP7)
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#define ASM_NOP8 _ASM_MK_NOP(K8_NOP8)
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#define ASM_NOP5_ATOMIC _ASM_MK_NOP(K8_NOP5_ATOMIC)
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#else
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#define ASM_NOP1 _ASM_MK_NOP(GENERIC_NOP1)
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#define ASM_NOP2 _ASM_MK_NOP(GENERIC_NOP2)
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#define ASM_NOP3 _ASM_MK_NOP(GENERIC_NOP3)
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#define ASM_NOP4 _ASM_MK_NOP(GENERIC_NOP4)
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#define ASM_NOP5 _ASM_MK_NOP(GENERIC_NOP5)
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#define ASM_NOP6 _ASM_MK_NOP(GENERIC_NOP6)
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#define ASM_NOP7 _ASM_MK_NOP(GENERIC_NOP7)
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#define ASM_NOP8 _ASM_MK_NOP(GENERIC_NOP8)
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#define ASM_NOP5_ATOMIC _ASM_MK_NOP(GENERIC_NOP5_ATOMIC)
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#endif
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#define ASM_NOP_MAX 8
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#define NOP_ATOMIC5 (ASM_NOP_MAX+1) /* Entry for the 5-byte atomic NOP */
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#ifndef __ASSEMBLY__
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extern const unsigned char * const *ideal_nops;
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extern void arch_init_ideal_nops(void);
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#endif
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#endif /* _ASM_X86_NOPS_H */
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