{ File: [Iris]<WMicro>DLion>Burdock.asm
Modification History:
DEG .PA: 1-Sep-84 17:56:03: Add copyright notice
DEG .PA: 14-Nov-83 14:40:52: put buffer back in Buffer.asm
AEF .PA: 8-Nov-83 9:53:18}
{ Copyright (C) 1983 by Xerox Corporation. All rights reserved.}
GET "RS232CDefs.asm"
GET "SysDefs.asm"
GET "CommonDefs.asm"
IMP ProcData0 ;BookKeepingTask
IMP ProcData1 ;BookKeepingTask
IMP ProcData2 ;BookKeepingTask
IMP TransferProcessorCSB ;BookKeepingTask
IMP Wait ;Common
IMP BurdockIOCB ;CPSubs
IMP BurdockDataBuffer ;From Buffer
IMP ReadCPBuffer ;CPSubs
IMP WriteCPBuffer ;CPSubs
IMP StartCPReadDma ;CPSubs
IMP StartCPWriteDma ;CPSubs
IMP CheckCPDmaComplete ;CPSubs
IMP DoNakedNotify ;CPSubs
IMP ZeroCommand ;From Common
EXP OldReadUmbilical
EXP OldWriteUmbilical
EXP DoBurdockCmd
StartBurdockCode:
TimeOutConst equ 0A000H ; Approx. .25 sec
OldReadUmbilical:
{Processor Command 7: Read a Block of Data from the other IOP via the Umbilical box
ProcData2 contains the number of bytes to transfer. ProcData1 and ProcData0 contain a Long Pointer to the user's buffer area. This area must be resident.}
CALL SetupOldDataPCB
LXI D,BurdockDataBuffer ;DE ← IOP Buffer address
ReadBlockLoop:
{Wait for a byte from (other) IOP Kernel. The inner loop is approximately 49 cycles (~= 17 usec). The delay is approximately 17 * TimeOutConst usec.}
LXI H,TimeOutConst
WaitToReadByte:
IN AltoPPIC
ANI IntBMask ;[7]
JNZ ReadByte ;[7] nz => Byte is ready
DCX H ;[6]
MOV A,H ;[4]
ORA L ;[4]
JNZ WaitToReadByte ;[10]
JMP SetUmbilicalReturnCode
ReadByte:
IN AltoPPIB
STAX D ;Store byte in buffer
INX D ;Increment buffer address
LHLD BlockCopyCount
DCX H
SHLD BlockCopyCount
MOV A,H
ORA L
JNZ ReadBlockLoop
CALL WriteDataBuffer ; Send block to CP
JMP SetUmbilicalReturnCode
OldWriteUmbilical:
{Processor Command 8: Do Write Umbilical Block Command.
ProcData2 contains the number of bytes to write in the high order byte. ProcData1 and ProcData0 contain a Long Pointer to the user's buffer area. This area must be resident.}
; Set up the PCB to transfer the data between CP virtual memory and BurdockDataBuffer.
CALL SetupOldDataPCB
CALL ReadDataBuffer ; Read block from CP
LXI D,BurdockDataBuffer ;DE ← IOP Buffer address
WriteBlockLoop:
LDAX D ;A ← next byte from buffer
OUT AltoPPIA ;Write data
{Now wait for the (other) IOP Kernel to grab the byte. The inner loop is approximately 49 cycles (~= 17 usec). The delay is approximately 17 * TimeOutConst usec.}
LXI H,TimeOutConst
WaitAckLoop:
IN AltoPPIC ;[11]
ANI IntAMask ;[7]
JNZ NextByte ;[7] nz => IOP Kernel took byte
DCX H ;[6]
MOV A,H ;[4]
ORA L ;[4]
JNZ WaitAckLoop ;[10]
SetUmbilicalReturnCode:
LHLD BlockCopyCount ;Will be zero if
SHLD ProcData0 ;all bytes transferred
JMP TransferProcessorCSB
NextByte:
INX D ;Increment buffer address
DB opLXIH ;HL ← BlockCopyCount
BlockCopyCount:
DW 0
DCX H
SHLD BlockCopyCount
MOV A,H
ORA L
JNZ WriteBlockLoop
JMP SetUmbilicalReturnCode
SetupOldDataPCB:
; Set up the PCB to transfer the data between CP virtual memory and BurdockDataBuffer.
LHLD ProcData1
SHLD BurdockDataLo
LHLD ProcData0
SHLD BurdockDataHi
LHLD ProcData2
SHLD BlockCopyCount
INX H ; Make the count even
MOV A,L
ANI 0FEH
MOV L,A
SHLD BurdockByteCnt
RET
;
BaseAddress EQU AltoPPI ; For IN and OUT
Status EQU BaseAddress+0
BufferFrmCPFull EQU 8H
BufferToCPFull EQU 10H
CPData EQU BaseAddress+1
Finger EQU BaseAddress+2
Contents EQU BaseAddress+3
{Beware of byte order: the bytes within a word get swapped}
BurdockInfo: DS 0
BurRegister: DS 1 ; Register to use for DebuggerBoard operations
BurCommand: DS 1 ; Command byte
BurNotifyBits: DS 2 ; Naked Notify bits
BurDataLow: DS 2 ; CP buffer pointer (low)
BurDataHigh: DS 2 ; CP buffer pointer (high)
BurByteCount: DS 2
BurdockInfoEnd: DS 0
BurdockInfoSize EQU BurdockInfoEnd-BurdockInfo
CopyBurdockIocb:
DS 2 ; CP buffer pointer (low)
DW 0 ; CP buffer pointer (high)
DW BurdockInfoSize ; CP buffer count (bytes)
DW BurdockInfo ; Pointer to IOP buffer
ZeroBurdockIocb:
DW BurdockIocbLoc ; CP buffer pointer (low)
DW CPIOPageHi ; CP buffer pointer (high)
DW 2 ; CP buffer count (bytes)
DW ZeroCommand ; Pointer to IOP buffer
BurdockDataPCB: ; PortControlBlock for sloshing Burdock data
BurdockDataLo: DW 0
BurdockDataHi: DW 0
BurdockByteCnt: DW 0
DW BurdockDataBuffer
DoBurdockCmd:
LHLD BurdockIOCB
SHLD CopyBurdockIocb
LXI H,CopyBurdockIocb
CALL ReadCPBuffer ; Copy over IOCB
LHLD BurDataLow; ; Setup data PCB
SHLD BurdockDataLo
LHLD BurDataHigh
SHLD BurdockDataHi
LHLD BurByteCount
INX H ; Make the count even
MOV A,L
ANI 0FEH
MOV L,A
SHLD BurdockByteCnt
LDA BurCommand
CPI 1
JZ ReadUmbilicalBlock
CPI 2
JZ WriteUmbilicalBlock
CPI 3
JZ ReadDebuggerBlock
CPI 4
JZ WriteDebuggerBlock
CPI 5
JZ ReadCPBlock
CPI 6
JZ WriteCPBlock
JMP UnknownBurdockCommand
ReadUmbilicalBlock:
CALL WriteDataBuffer
JMP UnknownBurdockCommand
WriteUmbilicalBlock:
CALL ReadDataBuffer
JMP UnknownBurdockCommand
ReadDebuggerBlock:
LDA BurRegister
OUT Finger
LXI D,BurdockDataBuffer ;DE ← IOP Buffer address
ReadDebuggerBlockLoop:
IN Contents
STAX D ; Store byte in buffer
INX D ; Increment buffer address
LHLD BurByteCount
DCX H
SHLD BurByteCount
MOV A,H
ORA L
JNZ ReadDebuggerBlockLoop
CALL WriteDataBuffer
JMP FinishBurdockCommand
WriteDebuggerBlock:
CALL ReadDataBuffer
LDA BurRegister
OUT Finger
LXI D,BurdockDataBuffer ; DE ← IOP Buffer address
WriteDebuggerBlockLoop:
LDAX D ; Load byte from buffer
OUT Contents
INX D ; Increment buffer address
LHLD BurByteCount
DCX H
SHLD BurByteCount
MOV A,H
ORA L
JNZ WriteDebuggerBlockLoop
JMP FinishBurdockCommand
ReadCPBlock:
LXI D,BurdockDataBuffer
ReadCPBlockLoop:
LXI H,TimeOutConst
ReadCPBlockWait:
DCX H
MOV A,H
ORA L
JZ Timeout
IN Status
ANI BufferFrmCPFull
JZ ReadCPBlockWait
IN CPData
STAX D
INX D
LHLD BurByteCount
DCX H
SHLD BurByteCount
MOV A,H
ORA L
JNZ ReadCPBlockLoop
CALL WriteDataBuffer
JMP FinishBurdockCommand
WriteCPBlock:
CALL ReadDataBuffer
LXI D,BurdockDataBuffer
WriteCPBlockLoop:
LDAX D ; A ← next byte from buffer
OUT CPData
LXI H,TimeOutConst
WriteCPBlockWait:
DCX H
MOV A,H
ORA L
JZ Timeout
IN Status
ANI BufferToCPFull
JNZ WriteCPBlockWait
INX D
LHLD BurByteCount
DCX H
SHLD BurByteCount
MOV A,H
ORA L
JNZ WriteCPBlockLoop
JMP FinishBurdockCommand
UnknownBurdockCommand:
XRA A
STA BurCommand ; Smash command byte for error marker
Timeout:
FinishBurdockCommand:
LXI H,CopyBurdockIocb ; Write back updated byte count
CALL WriteCPBuffer
LXI H,ZeroBurdockIocb
CALL WriteCPBuffer
LHLD BurNotifyBits
JMP DoNakedNotify ; and RET
ReadDataBuffer:
LXI H,BurdockDataPCB
CALL StartCPReadDma
JMP WaitForTransfer
WriteDataBuffer:
LXI H,BurdockDataPCB
CALL StartCPWriteDma
WaitForTransfer:
CALL CheckCPDmaComplete
JZ WaitForTransfer
RET
END Burdock