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Assembly Source File | 1993-05-05 | 18.1 KB | 775 lines

; WD8003E driver code ; Tim Krauskopf ;**************************************************************************** ;* * ;* * ;* part of NCSA Telnet * ;* by Tim Krauskopf, VT100 by Gaige Paulsen, Tek by Aaron Contorer * ;* * ;* National Center for Supercomputing Applications * ;* 152 Computing Applications Building * ;* 605 E. Springfield Ave. * ;* Champaign, IL 61820 * ;* * ;* * ;**************************************************************************** ; TITLE NETSUPPORT -- LOW LEVEL DRIVERS FOR ETHERNET ; ; Assembler support for interrupt-driven Ethernet I/O on the PC ; ; Reads and writes from the 8K buffer on the WD card. ; Started 4/11/88 ; include model.inc NAME NET8003 ifdef MSC6 INCLUDE NET\ENET\NET8003.INC else INCLUDE NET8003.INC endif ; ; macros for writing to WD board ; ;*********************************************************************** ; ; Macros, from example driver ; ;*********************************************************************** ; ; MACRO rd_wd8 ; Reads port specified on macro call. Leaves byte in AL. ; rd_wd8 MACRO port mov DX, WDBASE add DX, port ; DX contains address of port in AL, DX ; AL contains data read from port ENDM ; ; MACRO wr_wd8 ; Writes byte in AL to port specified on macro call. ; wr_wd8 MACRO port mov DX, WDBASE add DX, port ; DX contains address of port out DX, AL ; AL contains data to be written to port ENDM ; ifdef Microsoft ;DGROUP group _DATA ;_DATA segment public 'DATA' ; assume DS:DGROUP .data else DSEG ; PUBLIC RSTAT,BUFPT,BUFORG,BUFEND,BUFREAD,BUFBIG,BUFLIM endif ; ; The pointers below are actually DWORDs but we access them two ; bytes at a time. ; ; STAT change to RSTAT because of name clash with MSC library routine ifdef Microsoft EXTRN _RSTAT:BYTE ; last status from read EXTRN _BUFPT:WORD ; current buffer pointer EXTRN _BUFORG:WORD ; pointer to beginning of buffer EXTRN _BUFEND:WORD ; pointer to end of buffer EXTRN _BUFREAD:WORD ; pointer to where program is reading EXTRN _BUFBIG:WORD ; integer, how many bytes we have EXTRN _BUFLIM:WORD ; integer, max bytes we can have else EXTRN RSTAT:BYTE ; last status from read EXTRN BUFPT:WORD ; current buffer pointer EXTRN BUFORG:WORD ; pointer to beginning of buffer EXTRN BUFEND:WORD ; pointer to end of buffer EXTRN BUFREAD:WORD ; pointer to where program is reading EXTRN BUFBIG:WORD ; integer, how many bytes we have EXTRN BUFLIM:WORD ; integer, max bytes we can have endif ; ; ;RSTAT DB 00H ; last status from read ;BUFBIG DW 00H ; buffer space used ;BUFLIM DW 05000H ; buffer space limit ;BUFPT DW 00000H ; where buffer pointer is, initialized safely ;BUFDS DW 0a000H ; where buffer is, ds ;BUFORG DW 00000H ; start of buffer space ;BUFDS2 DW 0a000H ; another ds ;BUFEND DW 06000H ; end limit of allowable buffer space ;BUFDS3 DW 0a000H ;BUFREAD DW 00000H ; where the read pointer is ;BUFDS4 DW 0a000H WDBASE DW 00h ; base ioaddr WDADD DW 00h ; base shared mem addr DEAF DB 00H ; when we can't handle any more packets OFFS DW 00H ; how many times the handler was turned off ; ifdef Microsoft ;_DATA ends else ENDDS endif ; ; ; ; The subroutines to call from C ; ifdef Microsoft ;_TEXT segment public 'CODE' ; assume CS:_TEXT .code PUBLIC _WDRECV,_WDETOPEN,_WDETCLOSE,_WDGETADDR PUBLIC _WDSETADDR,_WDXMIT,_WDETUPDATE else PSEG PUBLIC WDRECV,WDETOPEN,WDETCLOSE,WDGETADDR PUBLIC WDSETADDR,WDXMIT,WDETUPDATE endif ;****************************************************************** ; ETOPEN ; Initialize the Ethernet board, set receive type. ; ; usage: etopen(s,irq,addr,ioaddr) ; char s[6]; ethernet address ; int irq,addr,ioaddr; ; interrupt number (unused), base mem address and ; i/o address to use ; START_PROC WDETOPEN PUSH BP MOV BP,SP mov AX,[BP+X+8] ; install ioaddr mov WDBASE,AX ; mov al, MSK_RESET ; reset it ; wr_wd8 W83CREG ; this didn't cure my invalid packet prob ; mov cx,1600 ;irst: ; in AL,061h ; loop irst ; xor al,al ; wr_wd8 W83CREG mov AX,[BP+X+6] ; install shared mem addr mov WDADD,AX ; ; put shared mem address into memory select register ; mov cl,9 shr ax,cl ; adapt for MSR reg wr_wd8 0 ; ship it to offset 0 (MSR) ; ; portions adapted from WD8STAR2.ASM example driver ; Initializations as recommended by manufacturer and National Semi ; cld ; Clear direction flag for movs... ; ; initial the LAN Controller register ; ; program for page 0 mov AL, MSK_PG0 + MSK_RD2 wr_wd8 CMDR ; initial DCR data configuration mov AL, MSK_BMS + MSK_FT10 ; select FIFO threshold = 8 bytes wr_wd8 DCR ; clr RBCR0,1 xor AL, AL wr_wd8 RBCR0 wr_wd8 RBCR1 ; initial RCR to monitor mode mov AL, MSK_MON wr_wd8 XRCR ; disable the rxer ; initial TCR xor AL, AL wr_wd8 TCR ; normal operation ; initial rev buffer ring mov AL, STOP_PG wr_wd8 PSTOP ; init PSTOP mov AL, STRT_PG wr_wd8 PSTART ; init PSTART to the 1st page of ring wr_wd8 BNRY ; init BNRY ; clr ISR by 1's mov AL, -1 ; write FF wr_wd8 ISR ; initial IMR mov AL, 00h ; ***NCSA Telnet does not ; ***need interrupts on wr_wd8 IMR ; enable interrupt ; program for page 1 mov AL, MSK_PG1 + MSK_RD2 wr_wd8 CMDR ; initial physical addr mov DX, WDBASE ; get board io base push DS mov ax,[bp+X+2] ; get seg from parms mov ds,ax mov CX, BPNA ; should be 6 for Ethernet mov BX, [BP+X] ; ptr to adr in BX add DX, PAR0 ; i/o address of PAR0 in DX lopa: mov AL, [BX] ; get 1 byte into AL out DX, AL ; write to PAR inc BX inc DX loop lopa pop DS ; initial multicast filter, write all 0's into MAR0 - MAR7 mov CX, 8 mov DX, WDBASE add DX, MAR0 ; i/o address of MAR0 in DX xor AL, AL lopb: out DX, AL inc DX loop lopb ; initial CURR = PSTART + 1 mov AL, STRT_PG + 1 wr_wd8 CURR ; program for page 0 mov AL, MSK_PG0 + MSK_RD2 wr_wd8 CMDR ; put 8390 on line mov AL, MSK_STA + MSK_RD2 ; activate 8390 wr_wd8 CMDR ; program RCR to normal operation (MSK_AB, no MSK_AM) mov AL, MSK_AB ; accept broadcast wr_wd8 XRCR ; XOR AX,AX POP BP RET END_PROC WDETOPEN ; ;****************************************************************** ; SETADDR ; set the Ethernet address on the board to 6 byte ID code ; ; usage: setaddr(s,basea,ioa); ; char s[6]; ethernet address to use ; int basea; shared memory base address ; int ioa; io address for board ; START_PROC WDSETADDR PUSH BP MOV BP,SP ; ; not used for this board, set during etopen ; POP BP RET END_PROC WDSETADDR ; ;******************************************************************* ; GETADDR ; get the Ethernet address off of the board ; ; usage: getaddr(s,address,ioaddr); ; char s[6]; will get six bytes from the PROM ; int address; ; int ioaddr; mem address and ioaddress to use ; START_PROC WDGETADDR PUSH BP MOV BP,SP PUSH DS MOV AX,[BP+X+2] ; SEG of where to put info MOV DS,AX MOV BX,[BP+X] ; address of where to put info mov cx,6 mov dx,[BP+X+6] ; ioaddr for board, offset 0 for PROM addr add dx,8 ; instruction added of WD8003e getloop: in al,dx mov [bx],al ; store where we want inc dx inc bx loop getloop ; XOR AX,AX in al,dx sub al,3 ; verification of board's existence jz noerr ; compare went ok mov ax,-1 ; error return noerr: POP DS POP BP RET END_PROC WDGETADDR ; ;*********************************************************************** ; ETCLOSE ; shut it down, remove the interrupt handler ; ; usage: etclose(); ; ; START_PROC WDETCLOSE RET END_PROC WDETCLOSE ; ;************************************************************************ ; Receive ; This is a CPU hook for boards that must be polled before we can ; deliver packets into the receive buffer. (i.e. no interrupts used) ; ; usage: recv(); ; START_PROC WDRECV push bp PUSH SI PUSH DI push es ; ; check for data which can be read ; mov AL, MSK_PG1 + MSK_RD2 ; read CURR reg wr_wd8 CMDR rd_wd8 CURR mov BL, AL ; CURR in BL mov AL, MSK_PG0 + MSK_RD2 ; read BNRY reg wr_wd8 CMDR rd_wd8 BNRY ; BNRY in AL add AL, 1 ; start page of frm in AL cmp AL, STOP_PG ; check boundary jne go_cmp mov AL, STRT_PG go_cmp: cmp AL, BL jne gotone jmp end_rx ; buff ring empty gotone: ; ring not empty mov BH, AL xor BL, BL ; BX has the rx_frm pointer push BX ; save the frm ptr mov AX, WDADD ; shared mem base mov ES, AX ; ES has the shr seg paragraph mov AL, ES:[BX] ; AL has the status byte test AL, SMK_PRX ; if rx good jnz readit jmp fd_bnry ; rx error, drop frm by forward bnry readit: ; ; set up to read the next packet from the net ; ; ; get ready for next packet ; cld ; moves in fwd dir ; ; check for buffer overrun or catching up with reader ; ; implicit 64K max buffer, should stop before 64K anyway ; ifdef Microsoft MOV AX,_BUFBIG ; how much stuff is in buffer MOV BX,_BUFLIM ; what is our size limit? else MOV AX,BUFBIG ; how much stuff is in buffer MOV BX,BUFLIM ; what is our size limit? endif CMP AX,BX JNA ISROOM ; we are ok ; ; no room at the Inn. ; JMP SHORT fd_bnry ; can't do much, we lose packets until restarted ; ; wrap pointer around at end, we know that we have room ; ISROOM: ifdef Microsoft MOV DI,word ptr [_BUFPT] ; where buffer is MOV DX,word ptr [_BUFEND] ; right before 2K safety area else MOV DI,word ptr [BUFPT] ; where buffer is MOV DX,word ptr [BUFEND] ; right before 2K safety area endif CMP DX,DI ; see if pointer is over limit JA OKAYREAD ; we are not at wrap-around ifdef Microsoft MOV AX,word ptr [_BUFORG] ; wrap to here MOV word ptr [_BUFPT],AX ; wrap-around else MOV AX,word ptr [BUFORG] ; wrap to here MOV word ptr [BUFPT],AX ; wrap-around endif MOV DI,AX ; di also OKAYREAD: ; ; ; start the copy of the new packet ; pointer to the shared memory offset is in BX ; At this offset, you will find: ; 1 byte - read status, usually 21h ; 1 byte - pointer, page # of next packet ; 2 bytes - length of data in packet, swapped for you already ; n bytes - that many bytes of Ethernet packet spread ; over n div 256 pages (allowing four lost bytes in first packet) ; ; pop si ; get packet pointer back into si push si ; restore for fd_bnry to read ; ; save regs while moving packet to buffer ; set up ds for buffer, even though we switch it later ; push es push ds ;ifdef Microsoft ; MOV AX,word ptr [_BUFPT+2] ; buffer's ds ;else ; MOV AX,word ptr [BUFPT+2] ; buffer's ds ;endif ; mov ds,ax ; ; here, DS:DI contains where we want to put the packet. ; newpkt: add si,2 ; offset for length field mov dx,es:[si] ; value of length of recd packet mov ds:[di],dx ; put the accumulated size there inc si inc si inc di inc di ; now it is the data pointer ; ; ; Actually move the data ; DX has packet size in bytes ; ES:SI has the source pointer } need to switch ; DS:DI has the dest pointer } es and ds ; Remember, 256 byte pages wrap around at STOP_PG and there ; are max 252 bytes in the first page ; mov cx,dx cmp cx,252 jng shrt mov cx,252 ; first page len shrt: mov ax,ds mov bx,es mov ds,bx mov es,ax ; swap them mov bx,dx ; save a copy of data length mvpg: ; start of page move loop sub dx,cx shr cx,1 ; convert to words jnc iseven movsb ; move odd one if needed iseven: rep movsw ; move all words in one page cmp dx,0 ; how many left to move? jng donepg mov cx,dx cmp cx,256 jng shrtr mov cx,256 ; one more page shrtr: mov ax,si ; look at source page cmp ah,STOP_PG jl mvpg mov ah,STRT_PG ; wrap around at this page boundary mov si,ax ; put back in si for rest of packet jmp mvpg donepg: pop ds pop es ; put regs back so ES is shared mem ; ; update the pointer and length in the buffer ; DI already points just past end of data just placed there ; ifdef Microsoft MOV word ptr [_BUFPT],di ; it is here, now MOV AX,word ptr [_BUFBIG] ; total amount of stuff in buffer else MOV word ptr [BUFPT],di ; it is here, now MOV AX,word ptr [BUFBIG] ; total amount of stuff in buffer endif ADD AX,BX ; add in size of this packet INC AX INC AX ; to cover the length value ifdef Microsoft MOV word ptr [_BUFBIG],AX ; after adding in current packet size else MOV word ptr [BUFBIG],AX ; after adding in current packet size endif ; ; ; signs that something is actually happening ; ; push es ; MOV AX,0B000H ; screen ; MOV ES,AX ; MOV DI,3998 ; lower right corner ; INC cs:ICNT ; MOV al,cs:ICNT ; character ; STOSB ; pop es ; ; drop bad frame by forwarding the BNRY register ; or just normal BNRY update after frame read ; fd_bnry: ; drop frm by forward BNRY pop BX ; restore frm ptr in BX add BX, 1 mov AL, ES:[BX] ; next frm start page in AL sub AL, 1 ; new BNRY in AL cmp AL, STRT_PG ; check boundary jge wrbnry mov AL, STOP_PG - 1 wrbnry: wr_wd8 BNRY end_rx: pop es POP DI POP SI POP BP RET ; for compatibility with other drivers ; ICNT db 0 END_PROC WDRECV ; ;************************************************************************ ; XMIT ; send a packet to Ethernet ; Is not interrupt driven, just call it when you need it. ; ; usage: xmit(packet,count) ; char *packet; ; int count; ; ; Takes a packet raw, Ethernet packets start with destination address, ; and puts it out onto the wire. Count is the length of packet < 2048 ; ; checks for packets under the Ethernet size limit of 60 and handles them ; START_PROC WDXMIT PUSH BP MOV BP,SP PUSH SI PUSH DI cld push es PUSH DS ; set up proper ds for the buffer ; mov dx,WDADD ; shared memory address in dx mov es,dx ; use es for this ; ; ; move packet into position, set up regs ; MOV AX,[BP+X+2] MOV DS,AX MOV SI,[BP+X] ; offset for buffer MOV AX,[BP+X+4] ; count of bytes MOV CX,AX ; save a copy, might be less than 60, ok CMP AX,60 ; minimum length for Ether JNB OKLEN MOV AX,60 ; make sure size at least 60 OKLEN: ; ; Copy packet into transmit buffer ; xmit buffer starts at offset zero in shared mem ; push ax ; xmit size here, CX has data size mov di,0 ; set di to start of xmit buffer, 0 page shr cx,1 jnc evenx movsb evenx: rep movsw ; copy all data into xmit buf ; ; set up xmit length registers ; pop ax pop ds ; get back DS for wr_wd8 macro ; set up TBCR0,1 wr_wd8 TBCR0 ; lower byte to TBCR0 mov AL, AH wr_wd8 TBCR1 ; higher byte to TBCR1 ; set page number to page 0 ; xor al,al ; page number ; set up TPSR wr_wd8 TPSR ; write start page into TPSR ; issue tx command mov AL, MSK_TXP + MSK_RD2 wr_wd8 CMDR ; start xmit ; ; ; check to see if the last packet xmitted ok ; xor cx,cx waitxmit: rd_wd8 CMDR ; command register test al,MSK_TXP ; xmit bit jz oktogo ; xmit is finished loop waitxmit ; waiting for xmit to complete mov ax,-1 jmp SHORT getout oktogo: xor ax,ax ; ; go back for more ; getout: pop es POP DI POP SI POP BP RET END_PROC WDXMIT ; ; ;************************************************************************* ; ETUPDATE ; update pointers and/or restart receiver when read routine has ; already removed the current packet ; ; usage: etupdate(); ; START_PROC WDETUPDATE PUSH ES ifdef Microsoft MOV AX,word ptr [_BUFPT+2] ; establish data segment to buffer else MOV AX,word ptr [BUFPT+2] ; establish data segment to buffer endif MOV ES,AX ; put that in es ; ifdef Microsoft MOV BX,_BUFREAD ; where read pointer is now else MOV BX,BUFREAD ; where read pointer is now endif MOV DX,ES:[BX] ; get size of this packet INC DX INC DX ; two more for length value ADD BX,DX ; increment bufread by size of packet ifdef Microsoft MOV CX,_BUFEND ; right before 2K safety area else MOV CX,BUFEND ; right before 2K safety area endif CMP BX,CX ; see if pointer is over limit JB NOWRAPRD ; we are not at wrap-around ifdef Microsoft MOV BX,_BUFORG ; wrap to here NOWRAPRD: MOV _BUFREAD,BX ; buffer pointer has been updated else MOV BX,BUFORG ; wrap to here NOWRAPRD: MOV BUFREAD,BX ; buffer pointer has been updated endif ; ; DECREMENT TOTAL BUFFER SIZE ; CLI ; keep interrupt handler from bothering dec ifdef Microsoft MOV CX,_BUFBIG ; size before removing packet else MOV CX,BUFBIG ; size before removing packet endif SUB CX,DX ; remove size of current packet ifdef Microsoft MOV _BUFBIG,CX ; put it back else MOV BUFBIG,CX ; put it back endif STI ; ; IF RECEIVER IS ON, THEN CHECKING BUFLIM IS UNNECESSARY. ; MOV AL,DEAF ; is the receiver turned off? OR AL,AL ; 0 = reading, 1 = deaf JZ ALIVE ; ; CHECK FOR ROOM IN THE BUFFER, IF THERE IS, TURN ON RECEIVER ; ifdef Microsoft MOV AX,_BUFLIM ; what is our limit? else MOV AX,BUFLIM ; what is our limit? endif CMP CX,AX ; compare to limit JA ALIVE ; not really alive, but can't turn on yet XOR AL,AL MOV DEAF,AL ; reset flag INC OFFS ; keep count how many times this happened ; ; turn receiver back on ; ALIVE: POP ES RET END_PROC WDETUPDATE ifdef Microsoft ;_TEXT ends else ENDPS endif END