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SYSTEM MANAGEMENT MODE

The programmer should not modify the contents of this area in SMRAM space directly. SMRAM

space is reserved for CPU access only and is intended to be used only when the processor is in

SMM.

7.3.5 Resume Instruction (RSM)

After an SMI# request is serviced, the RSM instruction must be executed to allow the CPU to

return to an application transparently after servicing the SMI#. When the RSM instruction is ex-

ecuted, it restores the CPU state from SMRAM and passes control back to the operating system.

The RSM instruction uses the special opcode of 0FAAH. The RSM instruction is reserved for the

SMI# handler and should only be executed by the SMI# handler. Any attempt to execute the RSM

outside of SMM mode results in an invalid opcode exception. At the end of the RSM instruction,

the processor drives SMIACT# high, indicating the end of an SMM routine.

7.4 THE Intel386 EX PROCESSOR IDENTIFIER REGISTERS

The processor has two identifier registers: the Component and Revision ID register and the SMM

Revision ID register. The component ID is 23H; the component revision ID is 09H. This register

can be read as 2309H. The SMM revision identifier is 10000H.

1 2 ... 169 170 171 172 173 174 175 176 177 178 179 ... 690 691

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