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1965aae3 PA |
1 | #ifndef _ASM_X86_NOPS_H |
2 | #define _ASM_X86_NOPS_H | |
bd61643e | 3 | |
dc326fca PA |
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 | |
bd61643e | 11 | |
4cd20952 PA |
12 | /* generic versions from gas |
13 | 1: nop | |
5d570cbb MP |
14 | the following instructions are NOT nops in 64-bit mode, |
15 | for 64-bit mode use K8 or P6 nops instead | |
4cd20952 PA |
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 | */ | |
dc326fca PA |
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 | |
bd61643e | 31 | |
4cd20952 PA |
32 | /* Opteron 64bit nops |
33 | 1: nop | |
34 | 2: osp nop | |
35 | 3: osp osp nop | |
36 | 4: osp osp osp nop | |
37 | */ | |
bd61643e | 38 | #define K8_NOP1 GENERIC_NOP1 |
dc326fca PA |
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 | |
bd61643e | 47 | |
4cd20952 | 48 | /* K7 nops |
0d2eb44f | 49 | uses eax dependencies (arbitrary choice) |
4cd20952 PA |
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 | |
dc326fca PA |
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 | |
bd61643e | 66 | |
4cd20952 PA |
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) | |
fc06b852 SR |
77 | Note: All the above are assumed to be a single instruction. |
78 | There is kernel code that depends on this. | |
4cd20952 | 79 | */ |
bd61643e | 80 | #define P6_NOP1 GENERIC_NOP1 |
dc326fca PA |
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 | ||
46326013 PA |
90 | #ifdef __ASSEMBLY__ |
91 | #define _ASM_MK_NOP(x) .byte x | |
92 | #else | |
dc326fca | 93 | #define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n" |
46326013 | 94 | #endif |
bd61643e | 95 | |
871de939 | 96 | #if defined(CONFIG_MK7) |
dc326fca PA |
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) | |
7343b3b3 | 106 | #elif defined(CONFIG_X86_P6_NOP) |
dc326fca PA |
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) | |
871de939 | 116 | #elif defined(CONFIG_X86_64) |
dc326fca PA |
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) | |
bd61643e | 126 | #else |
dc326fca PA |
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) | |
bd61643e AK |
136 | #endif |
137 | ||
138 | #define ASM_NOP_MAX 8 | |
dc326fca PA |
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 | |
bd61643e | 145 | |
1965aae3 | 146 | #endif /* _ASM_X86_NOPS_H */ |