INSERT[D0LANG];
NOMIDASINIT;
TITLE[d0rsr];
*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];

*d0rsr overlay
*Used by Midas to read RM 0 and RM 11-17, which cannot be read with the stackpointer, since
*stack overflow would be caused.

*Notify task 0 at 7510 + ReadCode to do the read
OverlayArea:
	RWSTAT _ RecvByte, Call[Recv], at[7500]; *get code (0-10b) into T
	RTMP _ pStk1,at[7501];
	Stkp _ RTMP, at[7502]; *set stkp to point to stack1
	stack1 _ 7400c, at[7503];
	stack1 _ (stack1) + (110c), at[7504];
	stack1 _ (stack1) + (T), at[7505]; *stack1 points to task 0, location 7510 + ReadCode
	stack0 _ 177400c, at[7506]; *set up stack0 to point to task 17, location 7523
	stack0 _ (stack0) + (123c), goto[NotifyBothWays], at[7507];
	
	SetTask[0];
RV[R0,0];
RV[R11,11];
RV[R12,12];
RV[R13,13];
RV[R14,14];
RV[R15,15];
RV[R16,16];
RV[R17,17];

	MNBR _ R0,goto[NotifyBothWays],at[7510];
	MNBR _ R11,goto[NotifyBothWays],at[7511];
	MNBR _ R12,goto[NotifyBothWays],at[7512];
	MNBR _ R13,goto[NotifyBothWays],at[7513];
	MNBR _ R14,goto[NotifyBothWays],at[7514];
	MNBR _ R15,goto[NotifyBothWays],at[7515];
	MNBR _ R16,goto[NotifyBothWays],at[7516];
	MNBR _ R17,goto[NotifyBothWays],at[7517];

	SetTask[17];
	nop, AT[7520];
NotifyBothWays:
	APC&APCTask _ Stack&-1,at[7521];
	return, AT[7522];
	T _ MNBR, AT[7523]; *back in task 17
	RDATA _ T, AT[7524];
	RWSTAT _ SendWord, Call[Send], AT[7525]; *send the word to Midas
	goto[NextCom], AT[7526];

	END;