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(nasm.info)Section B.4.295

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B.4.295. `SMINT', `SMINTOLD': Software SMM Entry (CYRIX)
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     SMINT                         ; 0F 38                [PENT,CYRIX]
     SMINTOLD                      ; 0F 7E                [486,CYRIX]

   `SMINT' puts the processor into SMM mode. The CPU state information
is saved in the SMM memory header, and then execution begins at the SMM
base address.

   `SMINTOLD' is the same as `SMINT', but was the opcode used on the
486.

   This pair of opcodes are specific to the Cyrix and compatible range
of processors (Cyrix, IBM, Via).