37 lines
847 B
C
37 lines
847 B
C
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! Miscellaneous constants used in assembler code.
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W = _WORD_SIZE ! Machine word size.
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! Offsets in struct proc. They MUST match proc.h.
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P_STACKBASE = 0
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#if _WORD_SIZE == 2
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ESREG = P_STACKBASE
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#else
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GSREG = P_STACKBASE
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FSREG = GSREG + 2 ! 386 introduces FS and GS segments
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ESREG = FSREG + 2
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#endif
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DSREG = ESREG + 2
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DIREG = DSREG + 2
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SIREG = DIREG + W
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BPREG = SIREG + W
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STREG = BPREG + W ! hole for another SP
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BXREG = STREG + W
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DXREG = BXREG + W
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CXREG = DXREG + W
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AXREG = CXREG + W
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RETADR = AXREG + W ! return address for save() call
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PCREG = RETADR + W
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CSREG = PCREG + W
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PSWREG = CSREG + W
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SPREG = PSWREG + W
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SSREG = SPREG + W
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P_STACKTOP = SSREG + W
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P_LDT_SEL = P_STACKTOP
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P_LDT = P_LDT_SEL + W
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#if _WORD_SIZE == 2
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Msize = 12 ! size of a message in 16-bit words
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#else
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Msize = 9 ! size of a message in 32-bit words
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#endif
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