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RDPID
Henk-Jan Lebbink edited this page Jun 5, 2018
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RDPID — Read Processor ID
| Opcode/ Instruction | Op/ En | 64/32- bit Mode | CPUID Feature Flag | Description |
| F3 0F C7 /7 RDPID r32 | R | N.E./V | RDPID | Read IA32_TSC_AUX into r32. |
| F3 0F C7 /7 RDPID r64 | R | V/N.E. | RDPID | Read IA32_TSC_AUX into r64. |
Instruction Operand Encoding1
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
| R | ModRM:r/m (w) | NA | NA | NA |
Reads the value of the IA32_TSC_AUX MSR (address C0000103H) into the destination register. The value of CS.D and operand-size prefixes (66H and REX.W) do not affect the behavior of the RDPID instruction.
DEST ← IA32_TSC_AUX None.
#UD If the LOCK prefix is used. If CPUID.7H.0:ECX.RDPID[bit 22] = 0.
Same exceptions as in protected mode.
Same exceptions as in protected mode.
Same exceptions as in protected mode.
Same exceptions as in protected mode.
1.ModRM.MOD = 011B required
Source: Intel® Architecture Software Developer's Manual (May 2018)
Generated: 5-6-2018