MSR(Model-Specific Register) Additional, indirectly-accessible, registers containing control or status information about various aspects of the processor such as caches, performance counters, and the like. These registers, accessible via the RDMSR and WRMSR instructions, were added with the Pentium and later-model 486 processors. C0000081h - AMD K6 - SYSCALL TARGET ADDRESS Size: 64 bits Note: if SYSCALL is supported (as indicated by CPUID; SYSCALL is not yet implemented in current steppings of the K6), this MSR(Model-Specific Register) Additional, indirectly-accessible, registers containing control or status information about various aspects of the processor such as caches, performance counters, and the like. These registers, accessible via the RDMSR and WRMSR instructions, were added with the Pentium and later-model 486 processors. specifies the address to which the SYSCALL instruction (opcode 0Fh 05h -- same as 80286 LOADALL!) transfers control, provided it has also been enabled via MSR(Model-Specific Register) Additional, indirectly-accessible, registers containing control or status information about various aspects of the processor such as caches, performance counters, and the like. These registers, accessible via the RDMSR and WRMSR instructions, were added with the Pentium and later-model 486 processors. C0000080h SeeAlso: MSR(Model-Specific Register) Additional, indirectly-accessible, registers containing control or status information about various aspects of the processor such as caches, performance counters, and the like. These registers, accessible via the RDMSR and WRMSR instructions, were added with the Pentium and later-model 486 processors. C0000080h,MSR(Model-Specific Register) Additional, indirectly-accessible, registers containing control or status information about various aspects of the processor such as caches, performance counters, and the like. These registers, accessible via the RDMSR and WRMSR instructions, were added with the Pentium and later-model 486 processors. C0000082h Bitfields for AMD K6 SYSCALL Target Address Register: Bit(s) Description (Table R0060) 63-48 "RET_BASE" CS and SS selector base for SYSRET 47-32 "CALL_BASE" CS and SS selector base for SYSCALL 31-0 "TEIP" target EIP address for SYSCALL SeeAlso: #R0059