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New Instructions 3-31

18524C/0—Nov1996 AMD-K5 Processor Technical Reference Manual

3.3.3 MOV to and from CR4

mnemonic opcode description

MOV CR4,r32 0F22 Move to CR4 from register

MOV r32,CR4 0F20 Move to register from CR4

Privilege: CPL = 0

Registers Affected: CR4, 32-bit general-purpose register

Flags Affected: none

Exceptions Generated: Real mode—none

Virtual-8086 mode—GP(0)

Protected mode—GP(0) if CPL not = 0

These instructions read and write control register 4 (CR4).

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