3-616
INSTRUCTION SET REFERENCE
RSMResume from System Management Mode
Description
This instruction returns program control from system management mode (SMM) to the applica-
tion program or operating-system procedure that was interrupted when the processor received
an SSM interrupt. The processors state is restored from the dump created upon entering SMM.
If the processor detects invalid state information during state restoration, it enters the shutdown
state. The following invalid information can cause a shutdown:
Any reserved bit of CR4 is set to 1.
Any illegal combination of bits in CR0, such as (PG=1 and PE=0) or (NW=1 and CD=0).
(Intel Pentium
®
and Intel486 processors only.) The value stored in the state dump base
field is not a 32-KByte aligned address.
The contents of the model-specific registers are not affected by a return from SMM.
Refer to Chapter 12, System Management Mode (SMM), in the Intel Architecture Software
Developers Manual, Volume 3, for more information about SMM and the behavior of the RSM
instruction.
Operation
ReturnFromSSM;
ProcessorState
<
Restore(SSMDump);
Flags Affected
All.
Protected Mode Exceptions
#UD
If an attempt is made to execute this instruction when the processor is not
in SMM.
Real-Address Mode Exceptions
#UD
If an attempt is made to execute this instruction when the processor is not
in SMM.
Virtual-8086 Mode Exceptions
#UD
If an attempt is made to execute this instruction when the processor is not
in SMM.
Opcode
Instruction
Description
0F AA
RSM
Resume operation of interrupted program
