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(nasm.info)Section B.4.272

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B.4.272. `RDSHR': Read SMM Header Pointer Register
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     RDSHR r/m32                   ; 0F 36 /0        [386,CYRIX,SMM]

   `RDSHR' reads the contents of the SMM header pointer register and
saves it to the destination operand, which can be either a 32 bit memory
location or a 32 bit register.

   See also `WRSHR' (*Note Section B.4.330::).