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| Rev | Author | Line No. | Line |
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| 5270 | serge | 1 | #ifndef _ASM_X86_NOPS_H |
| 2 | #define _ASM_X86_NOPS_H |
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| 3 | |||
| 4 | /* |
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| 5 | * Define nops for use with alternative() and for tracing. |
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| 6 | * |
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| 7 | * *_NOP5_ATOMIC must be a single instruction. |
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| 8 | */ |
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| 9 | |||
| 10 | #define NOP_DS_PREFIX 0x3e |
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| 11 | |||
| 12 | /* generic versions from gas |
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| 13 | 1: nop |
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| 14 | the following instructions are NOT nops in 64-bit mode, |
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| 15 | for 64-bit mode use K8 or P6 nops instead |
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| 16 | 2: movl %esi,%esi |
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| 17 | 3: leal 0x00(%esi),%esi |
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| 18 | 4: leal 0x00(,%esi,1),%esi |
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| 19 | 6: leal 0x00000000(%esi),%esi |
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| 20 | 7: leal 0x00000000(,%esi,1),%esi |
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| 21 | */ |
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| 22 | #define GENERIC_NOP1 0x90 |
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| 23 | #define GENERIC_NOP2 0x89,0xf6 |
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| 24 | #define GENERIC_NOP3 0x8d,0x76,0x00 |
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| 25 | #define GENERIC_NOP4 0x8d,0x74,0x26,0x00 |
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| 26 | #define GENERIC_NOP5 GENERIC_NOP1,GENERIC_NOP4 |
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| 27 | #define GENERIC_NOP6 0x8d,0xb6,0x00,0x00,0x00,0x00 |
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| 28 | #define GENERIC_NOP7 0x8d,0xb4,0x26,0x00,0x00,0x00,0x00 |
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| 29 | #define GENERIC_NOP8 GENERIC_NOP1,GENERIC_NOP7 |
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| 30 | #define GENERIC_NOP5_ATOMIC NOP_DS_PREFIX,GENERIC_NOP4 |
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| 31 | |||
| 32 | /* Opteron 64bit nops |
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| 33 | 1: nop |
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| 34 | 2: osp nop |
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| 35 | 3: osp osp nop |
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| 36 | 4: osp osp osp nop |
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| 37 | */ |
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| 38 | #define K8_NOP1 GENERIC_NOP1 |
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| 39 | #define K8_NOP2 0x66,K8_NOP1 |
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| 40 | #define K8_NOP3 0x66,K8_NOP2 |
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| 41 | #define K8_NOP4 0x66,K8_NOP3 |
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| 42 | #define K8_NOP5 K8_NOP3,K8_NOP2 |
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| 43 | #define K8_NOP6 K8_NOP3,K8_NOP3 |
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| 44 | #define K8_NOP7 K8_NOP4,K8_NOP3 |
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| 45 | #define K8_NOP8 K8_NOP4,K8_NOP4 |
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| 46 | #define K8_NOP5_ATOMIC 0x66,K8_NOP4 |
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| 47 | |||
| 48 | /* K7 nops |
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| 49 | uses eax dependencies (arbitrary choice) |
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| 50 | 1: nop |
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| 51 | 2: movl %eax,%eax |
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| 52 | 3: leal (,%eax,1),%eax |
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| 53 | 4: leal 0x00(,%eax,1),%eax |
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| 54 | 6: leal 0x00000000(%eax),%eax |
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| 55 | 7: leal 0x00000000(,%eax,1),%eax |
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| 56 | */ |
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| 57 | #define K7_NOP1 GENERIC_NOP1 |
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| 58 | #define K7_NOP2 0x8b,0xc0 |
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| 59 | #define K7_NOP3 0x8d,0x04,0x20 |
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| 60 | #define K7_NOP4 0x8d,0x44,0x20,0x00 |
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| 61 | #define K7_NOP5 K7_NOP4,K7_NOP1 |
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| 62 | #define K7_NOP6 0x8d,0x80,0,0,0,0 |
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| 63 | #define K7_NOP7 0x8D,0x04,0x05,0,0,0,0 |
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| 64 | #define K7_NOP8 K7_NOP7,K7_NOP1 |
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| 65 | #define K7_NOP5_ATOMIC NOP_DS_PREFIX,K7_NOP4 |
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| 66 | |||
| 67 | /* P6 nops |
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| 68 | uses eax dependencies (Intel-recommended choice) |
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| 69 | 1: nop |
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| 70 | 2: osp nop |
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| 71 | 3: nopl (%eax) |
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| 72 | 4: nopl 0x00(%eax) |
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| 73 | 5: nopl 0x00(%eax,%eax,1) |
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| 74 | 6: osp nopl 0x00(%eax,%eax,1) |
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| 75 | 7: nopl 0x00000000(%eax) |
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| 76 | 8: nopl 0x00000000(%eax,%eax,1) |
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| 77 | Note: All the above are assumed to be a single instruction. |
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| 78 | There is kernel code that depends on this. |
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| 79 | */ |
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| 80 | #define P6_NOP1 GENERIC_NOP1 |
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| 81 | #define P6_NOP2 0x66,0x90 |
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| 82 | #define P6_NOP3 0x0f,0x1f,0x00 |
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| 83 | #define P6_NOP4 0x0f,0x1f,0x40,0 |
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| 84 | #define P6_NOP5 0x0f,0x1f,0x44,0x00,0 |
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| 85 | #define P6_NOP6 0x66,0x0f,0x1f,0x44,0x00,0 |
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| 86 | #define P6_NOP7 0x0f,0x1f,0x80,0,0,0,0 |
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| 87 | #define P6_NOP8 0x0f,0x1f,0x84,0x00,0,0,0,0 |
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| 88 | #define P6_NOP5_ATOMIC P6_NOP5 |
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| 89 | |||
| 90 | #ifdef __ASSEMBLY__ |
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| 91 | #define _ASM_MK_NOP(x) .byte x |
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| 92 | #else |
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| 93 | #define _ASM_MK_NOP(x) ".byte " __stringify(x) "\n" |
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| 94 | #endif |
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| 95 | |||
| 96 | #if defined(CONFIG_MK7) |
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| 97 | #define ASM_NOP1 _ASM_MK_NOP(K7_NOP1) |
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| 98 | #define ASM_NOP2 _ASM_MK_NOP(K7_NOP2) |
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| 99 | #define ASM_NOP3 _ASM_MK_NOP(K7_NOP3) |
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| 100 | #define ASM_NOP4 _ASM_MK_NOP(K7_NOP4) |
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| 101 | #define ASM_NOP5 _ASM_MK_NOP(K7_NOP5) |
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| 102 | #define ASM_NOP6 _ASM_MK_NOP(K7_NOP6) |
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| 103 | #define ASM_NOP7 _ASM_MK_NOP(K7_NOP7) |
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| 104 | #define ASM_NOP8 _ASM_MK_NOP(K7_NOP8) |
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| 105 | #define ASM_NOP5_ATOMIC _ASM_MK_NOP(K7_NOP5_ATOMIC) |
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| 106 | #elif defined(CONFIG_X86_P6_NOP) |
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| 107 | #define ASM_NOP1 _ASM_MK_NOP(P6_NOP1) |
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| 108 | #define ASM_NOP2 _ASM_MK_NOP(P6_NOP2) |
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| 109 | #define ASM_NOP3 _ASM_MK_NOP(P6_NOP3) |
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| 110 | #define ASM_NOP4 _ASM_MK_NOP(P6_NOP4) |
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| 111 | #define ASM_NOP5 _ASM_MK_NOP(P6_NOP5) |
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| 112 | #define ASM_NOP6 _ASM_MK_NOP(P6_NOP6) |
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| 113 | #define ASM_NOP7 _ASM_MK_NOP(P6_NOP7) |
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| 114 | #define ASM_NOP8 _ASM_MK_NOP(P6_NOP8) |
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| 115 | #define ASM_NOP5_ATOMIC _ASM_MK_NOP(P6_NOP5_ATOMIC) |
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| 116 | #elif defined(CONFIG_X86_64) |
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| 117 | #define ASM_NOP1 _ASM_MK_NOP(K8_NOP1) |
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| 118 | #define ASM_NOP2 _ASM_MK_NOP(K8_NOP2) |
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| 119 | #define ASM_NOP3 _ASM_MK_NOP(K8_NOP3) |
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| 120 | #define ASM_NOP4 _ASM_MK_NOP(K8_NOP4) |
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| 121 | #define ASM_NOP5 _ASM_MK_NOP(K8_NOP5) |
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| 122 | #define ASM_NOP6 _ASM_MK_NOP(K8_NOP6) |
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| 123 | #define ASM_NOP7 _ASM_MK_NOP(K8_NOP7) |
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| 124 | #define ASM_NOP8 _ASM_MK_NOP(K8_NOP8) |
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| 125 | #define ASM_NOP5_ATOMIC _ASM_MK_NOP(K8_NOP5_ATOMIC) |
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| 126 | #else |
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| 127 | #define ASM_NOP1 _ASM_MK_NOP(GENERIC_NOP1) |
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| 128 | #define ASM_NOP2 _ASM_MK_NOP(GENERIC_NOP2) |
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| 129 | #define ASM_NOP3 _ASM_MK_NOP(GENERIC_NOP3) |
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| 130 | #define ASM_NOP4 _ASM_MK_NOP(GENERIC_NOP4) |
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| 131 | #define ASM_NOP5 _ASM_MK_NOP(GENERIC_NOP5) |
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| 132 | #define ASM_NOP6 _ASM_MK_NOP(GENERIC_NOP6) |
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| 133 | #define ASM_NOP7 _ASM_MK_NOP(GENERIC_NOP7) |
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| 134 | #define ASM_NOP8 _ASM_MK_NOP(GENERIC_NOP8) |
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| 135 | #define ASM_NOP5_ATOMIC _ASM_MK_NOP(GENERIC_NOP5_ATOMIC) |
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| 136 | #endif |
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| 137 | |||
| 138 | #define ASM_NOP_MAX 8 |
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| 139 | #define NOP_ATOMIC5 (ASM_NOP_MAX+1) /* Entry for the 5-byte atomic NOP */ |
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| 140 | |||
| 141 | #ifndef __ASSEMBLY__ |
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| 142 | extern const unsigned char * const *ideal_nops; |
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| 143 | extern void arch_init_ideal_nops(void); |
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| 144 | #endif |
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| 145 | |||
| 146 | #endif /* _ASM_X86_NOPS_H */ |