INSERT[D0LANG];
NOMIDASINIT;
TITLE[d0rdmi];
*last edited by CT June 10, 1979
SETTASK[17];

RV[REFR,77];	*memory refresh address

*The following registers hold the volatile state of the processor on a fault: 
RV[RXALU,76];	*ALU result and SALUF
RV[RXAPC,75];	*APCTask&APC
RV[RXCTASK,74];	*CTASK.NCIA
RV[RXPPB,73];	*Page,Parity,BootReason
RV[RXSTK,72];	*Stackpointer

RV[RTMP,71];	*temporary

*The following registers are used for D0-Midas communication (RTMP is also used):
RV[RWSTAT,70];	*status register
RV[RDATA,67];	*holds data

*FFault determines how faults will be treated when programs are running.  If it is
*zero, all faults will be reported to Midas.  If FFault is nonzero, the kernel will
*send control through location 120 when a fault occurs and PARITY # 0 (faults with
*PARITY = 0 are breakpoints).
RV[FFAULT,66];

*Registers between 360 and 367 are used by the Midas overlays.  The following 
*registers, used by WriteMI,  are also in this range.
RV[RADDR,65];

RV[RCNT,64];
RV[STACK4,64];

RV[RW0,63];
RV[STACK3,63];

RV[RW1,62];
RV[STACK2,62];

RV[STACK1,61];
MC[pStk1,361]; *pointer to stack1
RV[STACK0,60];


*Constants for Recv and Send
MC[RecvByte,12];
MC[RecvWord,16];
MC[SendByte,21];
MC[SendWord,25];

*The following are at fixed locations in Kernel.mc:
UserFault:	Return, AT[120];
NextCom:	Return, AT[7404];
Send:	Return, AT[7460];
Recv:	Return, AT[7464];

*d0rdmi overlay
*Used by Midas to read a microinstruction.

OverlayArea:
	RWSTAT _ RecvWord, Call[Recv], at[7500]; *get address
	RADDR _ T, at[7501];
	T _ 0c, call[RdCS], at[7502]; *read bits 0-15
	RDATA _ T, call[Send], at[7503];
	T _ 1c, call[RdCS], at[7504]; *read bits 16-31
	RDATA _ T, call[Send],at[7505];
	T _ 3c, call[RdCS], at[7506];*read bits 32-35 into T[0-3]
	RDATA _ T, at[7507];
	RWSTAT _ SendByte, call[Send], at[7510];
	goto[NextCom], at[7511];

RDCs:	APC&APCTask _ RADDR, at[7512];
	ReadCS, at[7513];
	RWSTAT _ SendWord, at[7514]; *note - this instruction must be at an even location
	usectask, at[7515];
	T _ CSData, return, at[7516];

	END;