XGETBV—Get Value of Extended Control Register

Opcode	Instruction	Op/En	64-Bit Mode	Compat/Leg Mode	Description
NP 0F 01 D0	XGETBV	ZO	Valid	Valid	Reads an XCR specified by ECX into EDX:EAX.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
ZO	N/A	N/A	N/A	N/A

Description

Reads the contents of the extended control register (XCR) specified in the ECX register into registers EDX:EAX. (On processors that support the Intel 64 architecture, the high-order 32 bits of RCX are ignored.) The EDX register is loaded with the high-order 32 bits of the XCR and the EAX register is loaded with the low-order 32 bits. (On proces-sors that support the Intel 64 architecture, the high-order 32 bits of each of RAX and RDX are cleared.) If fewer than 64 bits are implemented in the XCR being read, the values returned to EDX:EAX in unimplemented bit loca-tions are undefined.

XCR0 is supported on any processor that supports the XGETBV instruction. If CPUID.(EAX=0DH,ECX=1):EAX.XG1[bit 2] = 1, executing XGETBV with ECX = 1 returns in EDX:EAX the logical-AND of XCR0 and the current value of the XINUSE state-component bitmap. This allows software to discover the state of the init optimization used by XSAVEOPT and XSAVES. See Chapter 13, “Managing State Using the XSAVE Feature Set‚” in Intel^® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1.

Use of any other value for ECX results in a general-protection (#GP) exception.

Operation

EDX:EAX := XCR[ECX];

Flags Affected

None.

Intel C/C++ Compiler Intrinsic Equivalent

XGETBV unsigned __int64 _xgetbv( unsigned int);

Protected Mode Exceptions

#GP(0)

If an invalid XCR is specified in ECX (includes ECX = 1 if CPUID.(EAX=0DH,ECX=1):EAX.XG1[bit 2] = 0).

#UD

If CPUID.01H:ECX.XSAVE[bit 26] = 0.

If CR4.OSXSAVE[bit 18] = 0.

If the LOCK prefix is used.

Real-Address Mode Exceptions

#GP(0)

If an invalid XCR is specified in ECX (includes ECX = 1 if CPUID.(EAX=0DH,ECX=1):EAX.XG1[bit 2] = 0).

#UD

If CPUID.01H:ECX.XSAVE[bit 26] = 0.

If CR4.OSXSAVE[bit 18] = 0.

If the LOCK prefix is used.

Virtual-8086 Mode Exceptions

Same exceptions as in protected mode.

Compatibility Mode Exceptions

Same exceptions as in protected mode.

64-Bit Mode Exceptions

Same exceptions as in protected mode.