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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