minix/kernel/sconst.h

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2005-04-21 16:53:53 +02:00
! Miscellaneous constants used in assembler code.
W = _WORD_SIZE ! Machine word size.
! Offsets in struct proc. They MUST match proc.h.
P_STACKBASE = 0
#if _WORD_SIZE == 2
ESREG = P_STACKBASE
#else
GSREG = P_STACKBASE
FSREG = GSREG + 2 ! 386 introduces FS and GS segments
ESREG = FSREG + 2
#endif
DSREG = ESREG + 2
DIREG = DSREG + 2
SIREG = DIREG + W
BPREG = SIREG + W
STREG = BPREG + W ! hole for another SP
BXREG = STREG + W
DXREG = BXREG + W
CXREG = DXREG + W
AXREG = CXREG + W
RETADR = AXREG + W ! return address for save() call
PCREG = RETADR + W
CSREG = PCREG + W
PSWREG = CSREG + W
SPREG = PSWREG + W
SSREG = SPREG + W
P_STACKTOP = SSREG + W
P_LDT_SEL = P_STACKTOP
P_LDT = P_LDT_SEL + W
#if _WORD_SIZE == 2
Msize = 12 ! size of a message in 16-bit words
#else
Msize = 9 ! size of a message in 32-bit words
#endif