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Copyright 1991 David Jurgens |
MSW - Machine Status Word (286+ only)
│31│30-5│4│3│2│1│0│ Machine Status Word
│ │ │ │ │ │ └──── Protection Enable (PE)
│ │ │ │ │ └───── Math Present (MP)
│ │ │ │ └────── Emulation (EM)
│ │ │ └─────── Task Switched (TS)
│ │ └──────── Extension Type (ET)
│ └────────── Reserved
└───────────── Paging (PG)
Bit 0 PE Protection Enable, switches processor between
protected and real mode
Bit 1 MP Math Present, controls function of the WAIT
instruction
Bit 2 EM Emulation, indicates whether coprocessor functions
are to be emulated
Bit 3 TS Task Switched, set and interrogated by coprocessor
on task switches and when interpretting coprocessor
instructions
Bit 4 ET Extension Type, indicates type of coprocessor in
system
Bits 5-30 Reserved
bit 31 PG Paging, indicates whether the processor uses page
tables to translate linear addresses to physical
addresses
- see SMSW LMSW
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