;------------------------------------------------------------------------
; crtequ.a
;
; Contains equates defining code segment structures, thunks, and opcodes.
;


;; value of CPUFlag on a 68020

cpu68020 		= 2


;;
;; various trap numbers and 68000 opcodes

#define tnHWPriv $198
#define tnUnImp  $89F

opJMP32			= $4EF9			; 68000 opcode for JMP <ea>.l
opLoadSeg		= $A9F0			; line A trap for LoadSeg
opHWPriv 		= $A198			; line A trap for HWPriv

#define HWPriv	Atrap opHWPriv


;;
;; Low memory variables not defined in sysequ.a

jFlushCache		= $6F4
ResLoad			= $A5E


;;
;; Offsets into the "32-bit everything" segment.
;; The first two words are compatible with 16-bit segments.
;;

ofsThunks		= 0				; should be $FFFF
cThunks			= 2				; should be $0000
ofs16BitThunks	= 4				; offset to this segment's first 16-bit thunk
c16BitThunks	= 8				; count of this segment's 16-bit thunks
ofs32BitThunks	= 12			; offset to this segment's first 32-bit thunk
c32BitThunks	= 16			; count of this segment's 32-bit thunks
ofsA5RelInfo	= 20			; offset to global var fixups
lA5Cur			= 24			; current value of A5 ?????
ofsPCRelInfo	= 28			; offset to near call fixups
lSegStartCur	= 32			; start of segment
lReserved		= 36			; should be $00000000
cbSegHeader     = 40                    ; segment header size

;;
;; Offsets into the "32-bit everything" thunk table
;;

snStartup		= 0				; segment number of startup code
iFlagThunk		= 8				; start to the flag thunk entry
wVersion		= 10			; $FFFF = 32-bit everything, $0000 = 16-bit
lFlagRes		= 12			; reserved field, point to LoadSeg jump table

;;
;; value in flag thunk and at start of code segment indicating 32-bit everything

kVersion32bit	= $FFFF			


;;
;; offsets into RTState structure
;;

fVersion		= 0				; run-time version
fSP				= 2             ; SP: &-of user return address
fJTAddr			= 6             ; PC: &-of called jump table entry
fRegisters		= 10            ; D0-D7/A0-A6 when _LoadSeg was called
fSegNo			= 70            ; segment number
fSegType		= 72            ; segment type (normally 'CODE')
fSegSize		= 76            ; segment size
fSegInCore		= 80            ; true if segment is in memory
fReserved1		= 81            ; (reserved for future use)
fOSErr			= 82            ; error number
fReserved2		= 84            ; (reserved for possible future use)
pSeg			= 88            ; pointer to code segment


cbregsRTState	= 60			; size of fRegisters field
cbRTState		= 92			; size of whole RTstate structure


;;
;; Return codes from user handlers
;;

kRTSysErr		= 0
kRTRetry		= 1
kRTContinue		= 2
kRTHandled		= 3
kRTCannotUnload = 100