WebSVN – Kolibri OS – Blame – /kernel/trunk/network/eth_drv/drivers/sis900.inc

Rev	Author	Line No.	Line
261	hidnplayr	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
431	serge	3	;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;
		4	;; Distributed under terms of the GNU General Public License ;;
		5	;; ;;
261	hidnplayr	6	;; SIS900.INC ;;
		7	;; ;;
		8	;; Ethernet driver for Menuet OS ;;
		9	;; ;;
		10	;; Version 0.4 26 April 2004 ;;
		11	;; ;;
		12	;; This driver is based on the SIS900 driver from ;;
		13	;; the etherboot 5.0.6 project. The copyright statement is ;;
		14	;; ;;
		15	;; GNU GENERAL PUBLIC LICENSE ;;
		16	;; Version 2, June 1991 ;;
		17	;; ;;
		18	;; remaining parts Copyright 2004 Jason Delozier, ;;
		19	;; cordata51@hotmail.com ;;
		20	;; ;;
		21	;; See file COPYING for details ;;
		22	;; ;;
		23	;; Updates: ;;
		24	;; Revision Look up table and SIS635 Mac Address by Jarek Pelczar ;;
		25	;; ;;
		26	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
593	mikedld	27
		28	$Revision: 593 $
		29
		30
261	hidnplayr	31	;********************************************************************
		32	; Interface
		33	; SIS900_reset
		34	; SIS900_probe
		35	; SIS900_poll
		36	; SIS900_transmit
		37	;
		38	;********************************************************************
		39	;********************************************************************
		40	; Comments:
		41	; Known to work with the following SIS900 ethernet cards:
		42	; - Device ID: 0x0900 Vendor ID: 0x1039 Revision: 0x91
		43	; - Device ID: 0x0900 Vendor ID: 0x1039 Revision: 0x90
		44	;
		45	; If your card is not listed, try it and let me know if it
		46	; functions properly and it will be aded to the list. If not
		47	; we may be able to add support for it.
		48	;
		49	; How To Use:
		50	; Add the following lines to Ethernet.inc in their appropriate locations
		51	;
		52	; include "Sis900.INC"
		53	; dd 0x09001039, SIS900_probe, SIS900_reset, SIS900_poll,
		54	; SIS900_transmit
		55	; dd 0x70161039, SIS900_probe, SIS900_reset, SIS900_poll,
		56	; SIS900_transmit ;untested
		57	;
		58	; ToDo:
		59	; - Enable MII interface for reading speed
		60	; and duplex settings.
		61	;
		62	; - Update Poll routine to support packet fragmentation.
		63	;
		64	; - Add additional support for other sis900 based cards
		65	;
		66	;********************************************************************
		67
		68	; comment the next line out if you don't want debug info printed
		69	; on the debug board. This option adds a lot of bytes to the driver
		70	; so it's worth to comment it out.
		71	; SIS900_DEBUG equ 1
		72
		73
		74	;* buffers and descriptors
		75	cur_rx db 0
		76	NUM_RX_DESC equ 4 ;* Number of RX descriptors *
		77	NUM_TX_DESC equ 1 ;* Number of TX descriptors *
		78	RX_BUFF_SZ equ 1520 ;* Buffer size for each Rx buffer *
		79	TX_BUFF_SZ equ 1516 ;* Buffer size for each Tx buffer *
		80
		81	uglobal
		82	align 4
		83	txd: times (3 * NUM_TX_DESC) dd 0
		84	rxd: times (3 * NUM_RX_DESC) dd 0
		85	endg
		86
		87	txb equ eth_data_start
		88	rxb equ txb + (NUM_TX_DESC * TX_BUFF_SZ)
		89	SIS900_ETH_ALEN equ 6 ;* Size of Ethernet address *
		90	SIS900_ETH_HLEN equ 14 ;* Size of ethernet header *
		91	SIS900_ETH_ZLEN equ 60 ;* Minimum packet length *
		92	SIS900_DSIZE equ 0x00000fff
		93	SIS900_CRC_SIZE equ 4
		94	SIS900_RFADDR_shift equ 16
		95	;SIS900 Symbolic offsets to registers.
		96	SIS900_cr equ 0x0 ; Command Register
		97	SIS900_cfg equ 0x4 ; Configuration Register
		98	SIS900_mear equ 0x8 ; EEPROM Access Register
		99	SIS900_ptscr equ 0xc ; PCI Test Control Register
		100	SIS900_isr equ 0x10 ; Interrupt Status Register
		101	SIS900_imr equ 0x14 ; Interrupt Mask Register
		102	SIS900_ier equ 0x18 ; Interrupt Enable Register
		103	SIS900_epar equ 0x18 ; Enhanced PHY Access Register
		104	SIS900_txdp equ 0x20 ; Transmit Descriptor Pointer Register
		105	SIS900_txcfg equ 0x24 ; Transmit Configuration Register
		106	SIS900_rxdp equ 0x30 ; Receive Descriptor Pointer Register
		107	SIS900_rxcfg equ 0x34 ; Receive Configuration Register
		108	SIS900_flctrl equ 0x38 ; Flow Control Register
		109	SIS900_rxlen equ 0x3c ; Receive Packet Length Register
		110	SIS900_rfcr equ 0x48 ; Receive Filter Control Register
		111	SIS900_rfdr equ 0x4C ; Receive Filter Data Register
		112	SIS900_pmctrl equ 0xB0 ; Power Management Control Register
		113	SIS900_pmer equ 0xB4 ; Power Management Wake-up Event Register
		114	;SIS900 Command Register Bits
		115	SIS900_RELOAD equ 0x00000400
		116	SIS900_ACCESSMODE equ 0x00000200
		117	SIS900_RESET equ 0x00000100
		118	SIS900_SWI equ 0x00000080
		119	SIS900_RxRESET equ 0x00000020
		120	SIS900_TxRESET equ 0x00000010
		121	SIS900_RxDIS equ 0x00000008
		122	SIS900_RxENA equ 0x00000004
		123	SIS900_TxDIS equ 0x00000002
		124	SIS900_TxENA equ 0x00000001
		125	;SIS900 Configuration Register Bits
		126	SIS900_DESCRFMT equ 0x00000100 ; 7016 specific
		127	SIS900_REQALG equ 0x00000080
		128	SIS900_SB equ 0x00000040
		129	SIS900_POW equ 0x00000020
		130	SIS900_EXD equ 0x00000010
		131	SIS900_PESEL equ 0x00000008
		132	SIS900_LPM equ 0x00000004
		133	SIS900_BEM equ 0x00000001
		134	SIS900_RND_CNT equ 0x00000400
		135	SIS900_FAIR_BACKOFF equ 0x00000200
		136	SIS900_EDB_MASTER_EN equ 0x00002000
		137	;SIS900 Eeprom Access Reigster Bits
		138	SIS900_MDC equ 0x00000040
		139	SIS900_MDDIR equ 0x00000020
		140	SIS900_MDIO equ 0x00000010 ; 7016 specific
		141	SIS900_EECS equ 0x00000008
		142	SIS900_EECLK equ 0x00000004
		143	SIS900_EEDO equ 0x00000002
		144	SIS900_EEDI equ 0x00000001
		145	;SIS900 TX Configuration Register Bits
		146	SIS900_ATP equ 0x10000000 ;Automatic Transmit Padding
		147	SIS900_MLB equ 0x20000000 ;Mac Loopback Enable
		148	SIS900_HBI equ 0x40000000 ;HeartBeat Ignore (Req for full-dup)
		149	SIS900_CSI equ 0x80000000 ;CarrierSenseIgnore (Req for full-du
		150	;SIS900 RX Configuration Register Bits
		151	SIS900_AJAB equ 0x08000000 ;
		152	SIS900_ATX equ 0x10000000 ;Accept Transmit Packets
		153	SIS900_ARP equ 0x40000000 ;accept runt packets (<64bytes)
		154	SIS900_AEP equ 0x80000000 ;accept error packets
		155	;SIS900 Interrupt Reigster Bits
		156	SIS900_WKEVT equ 0x10000000
		157	SIS900_TxPAUSEEND equ 0x08000000
		158	SIS900_TxPAUSE equ 0x04000000
		159	SIS900_TxRCMP equ 0x02000000
		160	SIS900_RxRCMP equ 0x01000000
		161	SIS900_DPERR equ 0x00800000
		162	SIS900_SSERR equ 0x00400000
		163	SIS900_RMABT equ 0x00200000
		164	SIS900_RTABT equ 0x00100000
		165	SIS900_RxSOVR equ 0x00010000
		166	SIS900_HIBERR equ 0x00008000
		167	SIS900_SWINT equ 0x00001000
		168	SIS900_MIBINT equ 0x00000800
		169	SIS900_TxURN equ 0x00000400
		170	SIS900_TxIDLE equ 0x00000200
		171	SIS900_TxERR equ 0x00000100
		172	SIS900_TxDESC equ 0x00000080
		173	SIS900_TxOK equ 0x00000040
		174	SIS900_RxORN equ 0x00000020
		175	SIS900_RxIDLE equ 0x00000010
		176	SIS900_RxEARLY equ 0x00000008
		177	SIS900_RxERR equ 0x00000004
		178	SIS900_RxDESC equ 0x00000002
		179	SIS900_RxOK equ 0x00000001
		180	;SIS900 Interrupt Enable Reigster Bits
		181	SIS900_IE equ 0x00000001
		182	;SIS900 Revision ID
		183	SIS900B_900_REV equ 0x03
		184	SIS630A_900_REV equ 0x80
		185	SIS630E_900_REV equ 0x81
		186	SIS630S_900_REV equ 0x82
		187	SIS630EA1_900_REV equ 0x83
		188	SIS630ET_900_REV equ 0x84
		189	SIS635A_900_REV equ 0x90
		190	SIS900_960_REV equ 0x91
		191	;SIS900 Receive Filter Control Register Bits
		192	SIS900_RFEN equ 0x80000000
		193	SIS900_RFAAB equ 0x40000000
		194	SIS900_RFAAM equ 0x20000000
		195	SIS900_RFAAP equ 0x10000000
		196	SIS900_RFPromiscuous equ 0x70000000
		197	;SIS900 Reveive Filter Data Mask
		198	SIS900_RFDAT equ 0x0000FFFF
		199	;SIS900 Eeprom Address
		200	SIS900_EEPROMSignature equ 0x00
		201	SIS900_EEPROMVendorID equ 0x02
		202	SIS900_EEPROMDeviceID equ 0x03
		203	SIS900_EEPROMMACAddr equ 0x08
		204	SIS900_EEPROMChecksum equ 0x0b
		205	;The EEPROM commands include the alway-set leading bit.
		206	;SIS900 Eeprom Command
		207	SIS900_EEread equ 0x0180
		208	SIS900_EEwrite equ 0x0140
		209	SIS900_EEerase equ 0x01C0
		210	SIS900_EEwriteEnable equ 0x0130
		211	SIS900_EEwriteDisable equ 0x0100
		212	SIS900_EEeraseAll equ 0x0120
		213	SIS900_EEwriteAll equ 0x0110
		214	SIS900_EEaddrMask equ 0x013F
		215	SIS900_EEcmdShift equ 16
		216	;For SiS962 or SiS963, request the eeprom software access
		217	SIS900_EEREQ equ 0x00000400
		218	SIS900_EEDONE equ 0x00000200
		219	SIS900_EEGNT equ 0x00000100
		220	;General Varibles
		221	SIS900_pci_revision: db 0
		222	SIS900_Status dd 0x03000000
		223	sis900_specific_table:
		224	; dd SIS630A_900_REV,Get_Mac_SIS630A_900_REV,0
		225	; dd SIS630E_900_REV,Get_Mac_SIS630E_900_REV,0
		226	dd SIS630S_900_REV,Get_Mac_SIS635_900_REV,0
		227	dd SIS630EA1_900_REV,Get_Mac_SIS635_900_REV,0
		228	dd SIS630ET_900_REV,Get_Mac_SIS635_900_REV,0;SIS630ET_900_REV_SpecialFN
		229	dd SIS635A_900_REV,Get_Mac_SIS635_900_REV,0
		230	dd SIS900_960_REV,SIS960_get_mac_addr,0
		231	dd SIS900B_900_REV,SIS900_get_mac_addr,0
		232	dd 0,0,0,0 ; end of list
		233	sis900_get_mac_func: dd 0
		234	sis900_special_func: dd 0
		235	sis900_table_entries: db 8
		236
		237	;***************************************************************************
		238	; Function
		239	; SIS900_probe
		240	; Description
		241	; Searches for an ethernet card, enables it and clears the rx buffer
		242	; If a card was found, it enables the ethernet -> TCPIP link
		243	;not done - still need to probe mii transcievers
		244	;***************************************************************************
		245	if defined SIS900_DEBUG
		246	SIS900_Debug_Str_Unsupported db 'Sorry your card is unsupported ',13,10,0
		247	end if
		248	SIS900_probe:
		249	;****Wake Up Chip*****
		250	mov al, 4
		251	mov bh, [pci_dev]
		252	mov ecx, 0
		253	mov ah, [pci_bus]
		254	mov bl, 0x40
		255	call pci_write_reg
		256	;*****Set some PCI Settings*******
		257	call SIS900_adjust_pci_device
		258	;***Get Card Revision****
		259	mov al, 1 ;one byte to read
		260	mov bh, [pci_dev]
		261	mov ah, [pci_bus]
		262	mov bl, 0x08 ;Revision Register
		263	call pci_read_reg
		264	mov [SIS900_pci_revision], al ;save the revision for later use
		265	;****** Look up through the sis900_specific_table
		266	mov esi,sis900_specific_table
		267	.probe_loop:
		268	cmp dword [esi],0 ; Check if we reached end of the list
		269	je .probe_loop_failed
		270	cmp al,[esi] ; Check if revision is OK
		271	je .probe_loop_ok
		272	add esi,12 ; Advance to next entry
		273	jmp .probe_loop
		274	.probe_loop_failed:
		275	jmp SIS900_Probe_Unsupported
		276	;*******Find Get Mac Function*******
		277	.probe_loop_ok:
		278	mov eax,[esi+4] ; Get pointer to "get MAC" function
		279	mov [sis900_get_mac_func],eax
		280	mov eax,[esi+8] ; Get pointer to special initialization fn
		281	mov [sis900_special_func],eax
		282	;****** Get MAC ******
		283	call dword [sis900_get_mac_func]
		284	;****** Call special initialization fn if requested ******
		285	cmp dword [sis900_special_func],0
		286	je .no_special_init
		287	call dword [sis900_special_func]
		288	.no_special_init:
		289	;****** Set table entries ******
		290	mov al,[SIS900_pci_revision]
		291	cmp al,SIS635A_900_REV
		292	jae .ent16
		293	cmp al,SIS900B_900_REV
		294	je .ent16
		295	jmp .ent8
		296	.ent16:
		297	mov byte [sis900_table_entries],16
		298	.ent8:
		299	;*****Probe for mii transceiver*****
		300	;TODO!!*********************
		301	;*****Initialize Device*****
		302	call sis900_init
		303	ret
		304
		305	SIS900_Probe_Unsupported:
		306	if defined SIS900_DEBUG
		307	mov esi, SIS900_Debug_Str_Unsupported
		308	call sys_msg_board_str
		309	end if
		310	ret
		311	;***************************************************************************
		312	; Function: sis900_init
		313	;
		314	; Description: resets the ethernet controller chip and various
		315	; data structures required for sending and receiving packets.
		316	;
		317	; Arguments:
		318	;
		319	; returns: none
		320	;not done
		321	;***************************************************************************
		322	sis900_init:
		323	call SIS900_reset ;Done
		324	call SIS900_init_rxfilter ;Done
		325	call SIS900_init_txd ;Done
		326	call SIS900_init_rxd ;Done
		327	call SIS900_set_rx_mode ;done
		328	call SIS900_set_tx_mode
		329	;call SIS900_check_mode
		330	ret
		331
		332	;***************************************************************************
		333	; Function
		334	; SIS900_reset
		335	; Description
		336	; disables interrupts and soft resets the controller chip
		337	;
		338	;done+
		339	;***************************************************************************
		340	if defined SIS900_DEBUG
		341	SIS900_Debug_Reset_Failed db 'Reset Failed ',0
		342	end if
		343	SIS900_reset:
		344	;****Disable Interrupts and reset Receive Filter*****
		345	mov ebp, [io_addr] ; base address
		346	xor eax, eax ; 0 to initialize
		347	lea edx,[ebp+SIS900_ier]
		348	out dx, eax ; Write 0 to location
		349	lea edx,[ebp+SIS900_imr]
		350	out dx, eax ; Write 0 to location
		351	lea edx,[ebp+SIS900_rfcr]
		352	out dx, eax ; Write 0 to location
		353	;*****Reset Card*********************************************
		354	lea edx,[ebp+SIS900_cr]
		355	in eax, dx ; Get current Command Register
		356	or eax, SIS900_RESET ; set flags
		357	or eax, SIS900_RxRESET ;
		358	or eax, SIS900_TxRESET ;
		359	out dx, eax ; Write new Command Register
		360	;*****Wait Loop**********************************************
		361	lea edx,[ebp+SIS900_isr]
		362	mov ecx, [SIS900_Status] ; Status we would like to see from card
		363	mov ebx, 2001 ; only loop 1000 times
		364	SIS900_Wait:
		365	dec ebx ; 1 less loop
		366	jz SIS900_DoneWait_e ; 1000 times yet?
		367	in eax, dx ; move interrup status to eax
		368	and eax, ecx
		369	xor ecx, eax
		370	jz SIS900_DoneWait
		371	jmp SIS900_Wait
		372	SIS900_DoneWait_e:
		373	if defined SIS900_DEBUG
		374	mov esi, SIS900_Debug_Reset_Failed
		375	call sys_msg_board_str
		376	end if
		377	SIS900_DoneWait:
		378	;*****Set Configuration Register depending on Card Revision******
		379	lea edx,[ebp+SIS900_cfg]
		380	mov eax, SIS900_PESEL ; Configuration Register Bit
		381	mov bl, [SIS900_pci_revision] ; card revision
		382	mov cl, SIS635A_900_REV ; Check card revision
		383	cmp bl, cl
		384	je SIS900_RevMatch
		385	mov cl, SIS900B_900_REV ; Check card revision
		386	cmp bl, cl
		387	je SIS900_RevMatch
		388	out dx, eax ; no revision match
		389	jmp SIS900_Reset_Complete
		390	SIS900_RevMatch: ; Revision match
		391	or eax, SIS900_RND_CNT ; Configuration Register Bit
		392	out dx, eax
		393	SIS900_Reset_Complete:
		394	mov eax, [pci_data]
		395	mov [eth_status], eax
		396	ret
		397
		398	;***************************************************************************
		399	; Function: sis_init_rxfilter
		400	;
		401	; Description: sets receive filter address to our MAC address
		402	;
		403	; Arguments:
		404	;
		405	; returns:
		406	;done+
		407	;***************************************************************************
		408	SIS900_init_rxfilter:
		409	;**Get Receive Filter Control Register ******
		410	mov ebp, [io_addr] ; base address
		411	lea edx,[ebp+SIS900_rfcr]
		412	in eax, dx ; get register
		413	push eax
		414	;**disable packet filtering before setting filter*****
		415	mov eax, SIS900_RFEN ;move receive filter enable flag
		416	not eax ;1s complement
		417	pop ebx ;and with our saved register
		418	and eax, ebx ;disable receiver
		419	push ebx ;save filter for another use
		420	out dx, eax ;set receive disabled
		421	;******load MAC addr to filter data register*******
		422	xor ecx, ecx
		423	SIS900_RXINT_Mac_Write:
		424	;high word of eax tells card which mac byte to write
		425	mov eax, ecx
		426	lea edx,[ebp+SIS900_rfcr]
		427	shl eax, 16 ;
		428	out dx, eax ;
		429	lea edx,[ebp+SIS900_rfdr]
		430	mov ax, word [node_addr+ecx*2] ; Get Mac ID word
		431	out dx, ax ; Send Mac ID
		432	inc cl ; send next word
		433	cmp cl, 3 ; more to send?
		434	jne SIS900_RXINT_Mac_Write
		435	;******enable packet filitering ***
		436	pop eax ;old register value
		437	lea edx,[ebp+SIS900_rfcr]
		438	or eax, SIS900_RFEN ;enable filtering
		439	out dx, eax ;set register
		440	ret
		441
		442	;***************************************************************************
		443	;*
		444	;* Function: sis_init_txd
		445	;*
		446	;* Description: initializes the Tx descriptor
		447	;*
		448	;* Arguments:
		449	;*
		450	;* returns:
		451	;*done
		452	;***************************************************************************
		453	SIS900_init_txd:
		454	;******** initialize TX descriptor ************
		455	mov [txd], dword 0 ;put link to next descriptor in link field
		456	mov [txd+4],dword 0 ;clear status field
		457	mov [txd+8], dword txb ;save address to buffer ptr field
		458	;************* load Transmit Descriptor Register *************
		459	mov dx, [io_addr] ; base address
		460	add dx, SIS900_txdp ; TX Descriptor Pointer
		461	mov eax, txd ; First Descriptor
		462	out dx, eax ; move the pointer
		463	ret
		464
		465	;***************************************************************************
		466	;* Function: sis_init_rxd
		467	;*
		468	;* Description: initializes the Rx descriptor ring
		469	;*
		470	;* Arguments:
		471	;*
		472	;* Returns:
		473	;*done
		474	;***************************************************************************
		475	SIS900_init_rxd:
		476	xor ecx,ecx
		477	mov [cur_rx], cl ;Set cuurent rx discriptor to 0
		478	;****** init RX descriptors ******
		479	SIS900_init_rxd_Loop:
		480	mov eax, ecx ;current descriptor
		481	imul eax, 12 ;
		482	mov ebx, ecx ;determine next link descriptor
		483	inc ebx ;
		484	cmp ebx, NUM_RX_DESC ;
		485	jne SIS900_init_rxd_Loop_0 ;
		486	xor ebx, ebx ;
		487	SIS900_init_rxd_Loop_0: ;
		488	imul ebx, 12 ;
		489	add ebx, rxd ;
		490	mov [rxd+eax], ebx ;save link to next descriptor
		491	mov [rxd+eax+4],dword RX_BUFF_SZ ;status bits init to buf size
		492	mov ebx, ecx ;find where the buf is located
		493	imul ebx,RX_BUFF_SZ ;
		494	add ebx, rxb ;
		495	mov [rxd+eax+8], ebx ;save buffer pointer
		496	inc ecx ;next descriptor
		497	cmp ecx, NUM_RX_DESC ;
		498	jne SIS900_init_rxd_Loop ;
		499	;********* load Receive Descriptor Register with address of first
		500	; descriptor*********
		501	mov dx, [io_addr]
		502	add dx, SIS900_rxdp
		503	mov eax, rxd
		504	out dx, eax
		505	ret
		506
		507	;***************************************************************************
		508	;* Function: sis900_set_tx_mode
		509	;*
		510	;* Description:
		511	;* sets the transmit mode to allow for full duplex
		512	;*
		513	;*
		514	;* Arguments:
		515	;*
		516	;* Returns:
		517	;*
		518	;* Comments:
		519	;* If you are having problems transmitting packet try changing the
		520	;* Max DMA Burst, Possible settings are as follows:
		521	;* 0x00000000 = 512 bytes
		522	;* 0x00100000 = 4 bytes
		523	;* 0x00200000 = 8 bytes
		524	;* 0x00300000 = 16 bytes
		525	;* 0x00400000 = 32 bytes
		526	;* 0x00500000 = 64 bytes
		527	;* 0x00600000 = 128 bytes
		528	;* 0x00700000 = 256 bytes
		529	;***************************************************************************
		530	SIS900_set_tx_mode:
		531	mov ebp,[io_addr]
		532	lea edx,[ebp+SIS900_cr]
		533	in eax, dx ; Get current Command Register
		534	or eax, SIS900_TxENA ;Enable Receive
		535	out dx, eax
		536	lea edx,[ebp+SIS900_txcfg]; Transmit config Register offset
		537	mov eax, SIS900_ATP ;allow automatic padding
		538	or eax, SIS900_HBI ;allow heartbeat ignore
		539	or eax, SIS900_CSI ;allow carrier sense ignore
		540	or eax, 0x00600000 ;Max DMA Burst
		541	or eax, 0x00000100 ;TX Fill Threshold
		542	or eax, 0x00000020 ;TX Drain Threshold
		543	out dx, eax
		544	ret
		545
		546	;***************************************************************************
		547	;* Function: sis900_set_rx_mode
		548	;*
		549	;* Description:
		550	;* sets the receive mode to accept all broadcast packets and packets
		551	;* with our MAC address, and reject all multicast packets. Also allows
		552	;* full-duplex
		553	;*
		554	;* Arguments:
		555	;*
		556	;* Returns:
		557	;*
		558	;* Comments:
		559	;* If you are having problems receiving packet try changing the
		560	;* Max DMA Burst, Possible settings are as follows:
		561	;* 0x00000000 = 512 bytes
		562	;* 0x00100000 = 4 bytes
		563	;* 0x00200000 = 8 bytes
		564	;* 0x00300000 = 16 bytes
		565	;* 0x00400000 = 32 bytes
		566	;* 0x00500000 = 64 bytes
		567	;* 0x00600000 = 128 bytes
		568	;* 0x00700000 = 256 bytes
		569	;***************************************************************************
		570	SIS900_mc_filter: times 16 dw 0
		571	SIS900_set_rx_mode:
		572	mov ebp,[io_addr]
		573	;**************update Multicast Hash Table in Receive Filter
		574	mov ebx, 0xffff
		575	xor cl, cl
		576	SIS900_set_rx_mode_Loop:
		577	mov eax, ecx
		578	shl eax, 1
		579	mov [SIS900_mc_filter+eax], ebx
		580	lea edx,[ebp+SIS900_rfcr] ; Receive Filter Control Reg offset
		581	mov eax, 4 ;determine table entry
		582	add al, cl
		583	shl eax, 16
		584	out dx, eax ;tell card which entry to modify
		585	lea edx,[ebp+SIS900_rfdr] ; Receive Filter Control Reg offset
		586	mov eax, ebx ;entry value
		587	out dx, ax ;write value to table in card
		588	inc cl ;next entry
		589	cmp cl,[sis900_table_entries] ;
		590	jl SIS900_set_rx_mode_Loop
		591	;*****Set Receive Filter Control Register***********
		592	lea edx,[ebp+SIS900_rfcr] ; Receive Filter Control Register offset
		593	mov eax, SIS900_RFAAB ;accecpt all broadcast packets
		594	or eax, SIS900_RFAAM ;accept all multicast packets
		595	or eax, SIS900_RFAAP ;Accept all packets
		596	or eax, SIS900_RFEN ;enable receiver filter
		597	out dx, eax
		598	;****Enable Receiver**********
		599	lea edx,[ebp+SIS900_cr] ; Command Register offset
		600	in eax, dx ; Get current Command Register
		601	or eax, SIS900_RxENA ;Enable Receive
		602	out dx, eax
		603	;*********Set
		604	lea edx,[ebp+SIS900_rxcfg] ; Receive Config Register offset
		605	mov eax, SIS900_ATX ;Accept Transmit Packets
		606	; (Req for full-duplex and PMD Loopback)
		607	or eax, 0x00600000 ;Max DMA Burst
		608	or eax, 0x00000002 ;RX Drain Threshold, 8X8 bytes or 64bytes
		609	out dx, eax ;
		610	ret
		611
		612	;***************************************************************************
		613	; * SIS960_get_mac_addr: - Get MAC address for SiS962 or SiS963 model
		614	; * @pci_dev: the sis900 pci device
		615	; * @net_dev: the net device to get address for
		616	; *
		617	; * SiS962 or SiS963 model, use EEPROM to store MAC address. And EEPROM
		618	; * is shared by
		619	; * LAN and 1394. When access EEPROM, send EEREQ signal to hardware first
		620	; * and wait for EEGNT. If EEGNT is ON, EEPROM is permitted to be access
		621	; * by LAN, otherwise is not. After MAC address is read from EEPROM, send
		622	; * EEDONE signal to refuse EEPROM access by LAN.
		623	; * The EEPROM map of SiS962 or SiS963 is different to SiS900.
		624	; * The signature field in SiS962 or SiS963 spec is meaningless.
		625	; * MAC address is read into @net_dev->dev_addr.
		626	; *done
		627	;*
		628	;* Return 0 is EAX = failure
		629	;*Done+
		630	;***************************************************************************
		631	if defined SIS900_DEBUG
		632	SIS900_Debug_Str_GetMac_Start db 'Attempting to get SIS900 Mac ID: ',13,10,0
		633	SIS900_Debug_Str_GetMac_Failed db 'Access to EEprom Failed',13,10,0
		634	SIS900_Debug_Str_GetMac_Address db 'Your Mac ID is: ',0
		635	SIS900_Debug_Str_GetMac_Address2 db 'Your SIS96x Mac ID is: ',0
		636	end if
		637	SIS960_get_mac_addr:
		638	mov ebp,[io_addr]
		639	;********Send Request for eeprom access*******************
		640	lea edx,[ebp+SIS900_mear] ; Eeprom access register
		641	mov eax, SIS900_EEREQ ; Request access to eeprom
		642	out dx, eax ; Send request
		643	xor ebx,ebx ;
		644	;****Loop 4000 times and if access not granted error out***
		645	SIS96X_Get_Mac_Wait:
		646	in eax, dx ;get eeprom status
		647	and eax, SIS900_EEGNT ;see if eeprom access granted flag is set
		648	jnz SIS900_Got_EEP_Access ;if it is, go access the eeprom
		649	inc ebx ;else keep waiting
		650	cmp ebx, 4000 ;have we tried 4000 times yet?
		651	jl SIS96X_Get_Mac_Wait ;if not ask again
		652	xor eax, eax ;return zero in eax indicating failure
		653	;*****Debug ********************
		654	if defined SIS900_DEBUG
		655	mov esi,SIS900_Debug_Str_GetMac_Failed
		656	call sys_msg_board_str
		657	end if
		658	jmp SIS960_get_mac_addr_done
		659	;********EEprom access granted, read MAC from card***********
		660	SIS900_Got_EEP_Access:
		661	; zero based so 3-16 bit reads will take place
		662	mov ecx, 2
		663	SIS96x_mac_read_loop:
		664	mov eax, SIS900_EEPROMMACAddr ;Base Mac Address
		665	add eax, ecx ;Current Mac Byte Offset
		666	push ecx
		667	call sis900_read_eeprom ;try to read 16 bits
		668	pop ecx
		669	mov [node_addr+ecx*2], ax ;save 16 bits to the MAC ID varible
		670	dec ecx ;one less word to read
		671	jns SIS96x_mac_read_loop ;if more read more
		672	mov eax, 1 ;return non-zero indicating success
		673	;*****Debug Print MAC ID to debug window********************
		674	if defined SIS900_DEBUG
		675	mov esi,SIS900_Debug_Str_GetMac_Address2
		676	call sys_msg_board_str
		677	mov edx, node_addr
		678	call Create_Mac_String
		679	end if
		680	;********Tell EEPROM We are Done Accessing It*******************
		681	SIS960_get_mac_addr_done:
		682	lea edx,[ebp+SIS900_mear] ; Eeprom access register
		683	mov eax, SIS900_EEDONE ;tell eeprom we are done
		684	out dx,eax
		685	ret
		686	;***************************************************************************
		687	;* sis900_get_mac_addr: - Get MAC address for stand alone SiS900 model
		688	;* @pci_dev: the sis900 pci device
		689	;* @net_dev: the net device to get address for
		690	;*
		691	;* Older SiS900 and friends, use EEPROM to store MAC address.
		692	;* MAC address is read from read_eeprom() into @net_dev->dev_addr.
		693	;* done/untested
		694	;***************************************************************************
		695	SIS900_get_mac_addr:
		696	;*****Debug ********************
		697	if defined SIS900_DEBUG
		698	mov esi,SIS900_Debug_Str_GetMac_Start
		699	call sys_msg_board_str
		700	end if
		701	;****** check to see if we have sane EEPROM *****
		702	mov eax, SIS900_EEPROMSignature ;Base Eeprom Signature
		703	call sis900_read_eeprom ;try to read 16 bits
		704	cmp ax, 0xffff
		705	je SIS900_Bad_Eeprom
		706	cmp ax, 0
		707	je SIS900_Bad_Eeprom
		708	;************Read MacID************
		709	; zero based so 3-16 bit reads will take place
		710	mov ecx, 2
		711	SIS900_mac_read_loop:
		712	mov eax, SIS900_EEPROMMACAddr ;Base Mac Address
		713	add eax, ecx ;Current Mac Byte Offset
		714	push ecx
		715	call sis900_read_eeprom ;try to read 16 bits
		716	pop ecx
		717	mov [node_addr+ecx*2], ax ;save 16 bits to the MAC ID storage
		718	dec ecx ;one less word to read
		719	jns SIS900_mac_read_loop ;if more read more
		720	mov eax, 1 ;return non-zero indicating success
		721	;*****Debug Print MAC ID to debug window********************
		722	if defined SIS900_DEBUG
		723	mov esi,SIS900_Debug_Str_GetMac_Address
		724	call sys_msg_board_str
		725	mov edx, node_addr
		726	call Create_Mac_String
		727	end if
		728	ret
		729
		730	SIS900_Bad_Eeprom:
		731	xor eax, eax
		732	;*****Debug ********************
		733	if defined SIS900_DEBUG
		734	mov esi,SIS900_Debug_Str_GetMac_Failed
		735	call sys_msg_board_str
		736	end if
		737	ret
		738	;***************************************************************************
		739	;* Get_Mac_SIS635_900_REV: - Get MAC address for model 635
		740	;*
		741	;*
		742	;***************************************************************************
		743	Get_Mac_SIS635_900_REV:
		744	if defined SIS900_DEBUG
		745	mov esi,SIS900_Debug_Str_GetMac_Start
		746	call sys_msg_board_str
		747	end if
		748	mov ebp,[io_addr]
		749	lea edx,[ebp+SIS900_rfcr]
		750	in eax,dx
		751	mov edi,eax ; EDI=rfcrSave
		752	lea edx,[ebp+SIS900_cr]
		753	or eax,SIS900_RELOAD
		754	out dx,eax
		755	xor eax,eax
		756	out dx,eax
		757	; Disable packet filtering before setting filter
		758	lea edx,[ebp+SIS900_rfcr]
		759	mov eax,edi
		760	and edi,not SIS900_RFEN
		761	out dx,eax
		762	; Load MAC to filter data register
		763	xor ecx,ecx
		764	mov esi,node_addr
		765	.get_mac_loop:
		766	lea edx,[ebp+SIS900_rfcr]
		767	mov eax,ecx
		768	shl eax,SIS900_RFADDR_shift
		769	out dx,eax
		770	lea edx,[ebp+SIS900_rfdr]
		771	in eax,dx
		772	mov [esi],ax
		773	add esi,2
		774	inc ecx
		775	cmp ecx,3
		776	jne .get_mac_loop
		777	; Enable packet filtering
		778	;lea edx,[ebp+SIS900_rfcr]
		779	;mov eax,edi
		780	;or eax,SIS900_RFEN
		781	;out dx, eax
		782	;*****Debug Print MAC ID to debug window********************
		783	if defined SIS900_DEBUG
		784	mov esi,SIS900_Debug_Str_GetMac_Address
		785	call sys_msg_board_str
		786	mov edx, node_addr
		787	call Create_Mac_String
		788	end if
		789	ret
		790	;***************************************************************************
		791	;* Function: sis900_read_eeprom
		792	;*
		793	;* Description: reads and returns a given location from EEPROM
		794	;*
		795	;* Arguments: eax - location: requested EEPROM location
		796	;*
		797	;* Returns: eax : contents of requested EEPROM location
		798	;*
		799	; Read Serial EEPROM through EEPROM Access Register, Note that location is
		800	; in word (16 bits) unit */
		801	;done+
		802	;***************************************************************************
		803	sis900_read_eeprom:
		804	push esi
		805	push edx
		806	push ecx
		807	push ebx
		808	mov ebp,[io_addr]
		809	mov ebx, eax ;location of Mac byte to read
		810	or ebx, SIS900_EEread ;
		811	lea edx,[ebp+SIS900_mear] ; Eeprom access register
		812	xor eax, eax ; start send
		813	out dx,eax
		814	call SIS900_Eeprom_Delay_1
		815	mov eax, SIS900_EECLK
		816	out dx, eax
		817	call SIS900_Eeprom_Delay_1
		818	;********** Shift the read command (9) bits out. *******
		819	mov cl, 8 ;
		820	sis900_read_eeprom_Send:
		821	mov eax, 1
		822	shl eax, cl
		823	and eax, ebx
		824	jz SIS900_Read_Eeprom_8
		825	mov eax, 9
		826	jmp SIS900_Read_Eeprom_9
		827	SIS900_Read_Eeprom_8:
		828	mov eax, 8
		829	SIS900_Read_Eeprom_9:
		830	out dx, eax
		831	call SIS900_Eeprom_Delay_1
		832	or eax, SIS900_EECLK
		833	out dx, eax
		834	call SIS900_Eeprom_Delay_1
		835	cmp cl, 0
		836	je sis900_read_eeprom_Send_Done
		837	dec cl
		838	jmp sis900_read_eeprom_Send
		839	;*********************
		840	sis900_read_eeprom_Send_Done:
		841	mov eax, SIS900_EECS ;
		842	out dx, eax
		843	call SIS900_Eeprom_Delay_1
		844	;******** Read 16-bits of data in *************
		845	mov cx, 16 ;16 bits to read
		846	sis900_read_eeprom_Send2:
		847	mov eax, SIS900_EECS
		848	out dx, eax
		849	call SIS900_Eeprom_Delay_1
		850	or eax, SIS900_EECLK
		851	out dx, eax
		852	call SIS900_Eeprom_Delay_1
		853	in eax, dx
		854	shl ebx, 1
		855	and eax, SIS900_EEDO
		856	jz SIS900_Read_Eeprom_0
		857	or ebx, 1
		858	SIS900_Read_Eeprom_0:
		859	dec cx
		860	jnz sis900_read_eeprom_Send2
		861	;************ Terminate the EEPROM access. ************
		862	xor eax, eax
		863	out dx, eax
		864	call SIS900_Eeprom_Delay_1
		865	mov eax, SIS900_EECLK
		866	out dx, eax
		867	mov eax, ebx
		868	and eax, 0x0000ffff ;return only 16 bits
		869	pop ebx
		870	pop ecx
		871	pop edx
		872	pop esi
		873	ret
		874	;***************************************************************************
		875	; Function
		876	; SIS900_Eeprom_Delay_1
		877	; Description
		878	;
		879	;
		880	;
		881	;
		882	;***************************************************************************
		883	SIS900_Eeprom_Delay_1:
		884	push eax
		885	in eax, dx
		886	pop eax
		887	ret
		888
		889	;***************************************************************************
		890	; Function
		891	; SIS900_poll
		892	; Description
		893	; polls card to see if there is a packet waiting
		894	;
		895	; Currently only supports one descriptor per packet, if packet is fragmented
		896	; between multiple descriptors you will lose part of the packet
		897	;***************************************************************************
		898	if defined SIS900_DEBUG
		899	SIS900_Debug_Pull_Packet_good db 'Good Packet Waiting: ',13,10,0
		900	SIS900_Debug_Pull_Bad_Packet_Status db 'Bad Packet Waiting: Status',13,10,0
		901	SIS900_Debug_Pull_Bad_Packet_Size db 'Bad Packet Waiting: Size',13,10,0
		902	end if
		903	SIS900_poll:
		904	;************Get Status ************
		905	xor eax, eax ;get RX_Status
		906	mov [eth_rx_data_len], ax
		907	mov al, [cur_rx] ;find current discriptor
		908	imul eax, 12 ;
		909	mov ecx, [rxd+eax+4] ; get receive status
		910	;************Check Status ************
		911	mov ebx, ecx ;move status
		912	;Check RX_Status to see if packet is waiting
		913	and ebx, 0x80000000
		914	jnz SIS900_poll_IS_packet
		915	ret
		916	;********There is a packet waiting check it for errors************
		917	SIS900_poll_IS_packet:
		918	mov ebx, ecx ;move status
		919	and ebx, 0x67C0000 ;see if there are any errors
		920	jnz SIS900_Poll_Error_Status
		921	;************Check size of packet***********
		922	and ecx, SIS900_DSIZE ;get packet size minus CRC
		923	cmp cx, SIS900_CRC_SIZE
		924	;make sure packet contains data
		925	jle SIS900_Poll_Error_Size
		926	;*****Copy Good Packet to receive buffer****
		927	sub cx, SIS900_CRC_SIZE ;dont want crc
		928	mov word [eth_rx_data_len], cx ;save size of packet
		929	;********Continue copying packet**************
		930	push ecx
		931	; first copy dword-wise, divide size by 4
		932	shr ecx, 2
		933	mov esi, [rxd+eax+8] ; set source
		934	mov edi, Ether_buffer ; set destination
		935	cld ; clear direction
		936	rep movsd ; copy the dwords
		937	pop ecx
		938	and ecx, 3 ;
		939	rep movsb
		940	;******Debug, tell user we have a good packet***********
		941	if defined SIS900_DEBUG
		942	mov esi, SIS900_Debug_Pull_Packet_good
		943	call sys_msg_board_str
		944	end if
		945	jmp SIS900_Poll_Cnt ;
		946	;***********Error occured let user know through debug window*********
		947	SIS900_Poll_Error_Status:
		948	if defined SIS900_DEBUG
		949	mov esi, SIS900_Debug_Pull_Bad_Packet_Status
		950	call sys_msg_board_str
		951	end if
		952	jmp SIS900_Poll_Cnt
		953	SIS900_Poll_Error_Size:
		954	if defined SIS900_DEBUG
		955	mov esi, SIS900_Debug_Pull_Bad_Packet_Size
		956	call sys_msg_board_str
		957	end if
		958	;***********Increment to next available descriptor************
		959	SIS900_Poll_Cnt:
		960	;Reset status, allow ethernet card access to descriptor
		961	mov ecx, RX_BUFF_SZ
		962	mov [rxd+eax+4], ecx ;
		963	inc [cur_rx] ;get next descriptor
		964	and [cur_rx],3 ;only 4 descriptors 0-3
		965	;****Enable Receiver**********
		966	mov ebp, [io_addr] ; Base Address
		967	lea edx,[ebp+SIS900_cr] ; Command Register offset
		968	in eax, dx ; Get current Command Register
		969	or eax, SIS900_RxENA ;Enable Receive
		970	out dx, eax
		971	ret
		972	;***************************************************************************
		973	; Function
		974	; SIS900_transmit
		975	; Description
		976	; Transmits a packet of data via the ethernet card
		977	; Pointer to 48 bit destination address in edi
		978	; Type of packet in bx
		979	; size of packet in ecx
		980	; pointer to packet data in esi
		981	;
		982	; only one transmit descriptor is used
		983	;
		984	;***************************************************************************
		985	if defined SIS900_DEBUG
		986	SIS900_Debug_Transmit_Packet db 'Transmitting Packet: ',13,10,0
		987	SIS900_Debug_Transmit_Packet_Err db 'Transmitting Packet Error: ',13,10,0
		988	end if
		989	SIS900_transmit:
		990	mov ebp, [io_addr] ; Base Address
		991	;****** Stop the transmitter ******
		992	lea edx,[ebp+SIS900_cr] ; Command Register offset
		993	in eax, dx ; Get current Command Register
		994	or eax, SIS900_TxDIS ; Disable Transmitter
		995	out dx, eax
		996	;*****load Transmit Descriptor Register *****
		997	lea edx,[ebp+SIS900_txdp]
		998	mov eax, txd
		999	out dx, eax
		1000	;***** copy packet to descriptor*****
		1001	push esi
		1002	mov esi, edi ;copy destination addess
		1003	mov edi, txb
		1004	cld
		1005	movsd
		1006	movsw
		1007	mov esi, node_addr ;copy my mac address
		1008	movsd
		1009	movsw
		1010	mov [edi], bx ;copy packet type
		1011	add edi, 2
		1012	pop esi ;restore pointer to source of packet
		1013	push ecx ;save packet size
		1014	shr ecx, 2 ;divide by 4, size in bytes send in dwords
		1015	rep movsd ;copy data to decriptor
		1016	pop ecx ;restore packet size
		1017	push ecx ;save packet size
		1018	and ecx, 3 ;last three bytes if not a multiple of 4
		1019	rep movsb
		1020	;************set length tag************
		1021	pop ecx ;restore packet size
		1022	add ecx, SIS900_ETH_HLEN ;add header to length
		1023	and ecx, SIS900_DSIZE ;
		1024	;************pad to minimum packet size ************not needed
		1025	;cmp ecx, SIS900_ETH_ZLEN
		1026	;jge SIS900_transmit_Size_Ok
		1027	;push ecx
		1028	;mov ebx, SIS900_ETH_ZLEN
		1029	;sub ebx, ecx
		1030	;mov ecx, ebx
		1031	;rep movsb
		1032	;pop ecx
		1033	SIS900_transmit_Size_Ok:
		1034	mov [txd+4], dword 0x80000000 ;card owns descriptor
		1035	or [txd+4], ecx ;set size of packet
		1036	if defined SIS900_DEBUG
		1037	mov esi, SIS900_Debug_Transmit_Packet
		1038	call sys_msg_board_str
		1039	end if
		1040	;*************restart the transmitter ******
		1041	lea edx,[ebp+SIS900_cr]
		1042	in eax, dx ; Get current Command Register
		1043	or eax, SIS900_TxENA ; Enable Transmitter
		1044	out dx, eax
		1045	;**make sure packet transmitted successfully**
		1046	; mov esi,10
		1047	; call delay_ms
		1048	mov eax, [txd+4]
		1049	and eax, 0x6200000
		1050	jz SIS900_transmit_OK
		1051	;**************Tell user there was an error through debug window
		1052	if defined SIS900_DEBUG
		1053	mov esi, SIS900_Debug_Transmit_Packet_Err
		1054	call sys_msg_board_str
		1055	end if
		1056	SIS900_transmit_OK:
		1057	;****** Disable interrupts by clearing the interrupt mask. ******
		1058	lea edx,[ebp+SIS900_imr] ; Interupt Mask Register
		1059	xor eax, eax
		1060	out dx,eax
		1061	ret
		1062
		1063	;***************************************************************************
		1064	;* Function: Create_Mac_String
		1065	;*
		1066	;* Description: Converts the 48 bit value to a string for display
		1067	;*
		1068	;* String Format: XX:XX:XX:XX:XX:XX
		1069	;*
		1070	;* Arguments: node_addr is location of 48 bit MAC ID
		1071	;*
		1072	;* Returns: Prints string to general debug window
		1073	;*
		1074	;*
		1075	;done
		1076	;***************************************************************************
		1077	if defined SIS900_DEBUG
		1078
		1079	SIS900_Char_String db '0','1','2','3','4','5','6','7','8','9'
		1080	db 'A','B','C','D','E','F'
		1081	Mac_str_build: times 20 db 0
		1082	Create_Mac_String:
		1083	pusha
		1084	xor ecx, ecx
		1085	Create_Mac_String_loop:
		1086	mov al,byte [edx+ecx];[node_addr+ecx]
		1087	push eax
		1088	shr eax, 4
		1089	and eax, 0x0f
		1090	mov bl, byte [SIS900_Char_String+eax]
		1091	mov [Mac_str_build+ecx*3], bl
		1092	pop eax
		1093	and eax, 0x0f
		1094	mov bl, byte [SIS900_Char_String+eax]
		1095	mov [Mac_str_build+1+ecx*3], bl
		1096	cmp ecx, 5
		1097	je Create_Mac_String_done
		1098	mov bl, ':'
		1099	mov [Mac_str_build+2+ecx*3], bl
		1100	inc ecx
		1101	jmp Create_Mac_String_loop
		1102	Create_Mac_String_done: ;Insert CR and Zero Terminate
		1103	mov [Mac_str_build+2+ecx*3],byte 13
		1104	mov [Mac_str_build+3+ecx*3],byte 10
		1105	mov [Mac_str_build+4+ecx*3],byte 0
		1106	mov esi, Mac_str_build
		1107	call sys_msg_board_str ;Print String to message board
		1108	popa
		1109	ret
		1110	end if
		1111	;***************************************************************************
		1112	;* Set device to be a busmaster in case BIOS neglected to do so.
		1113	;* Also adjust PCI latency timer to a reasonable value, 64.
		1114	;***************************************************************************
		1115	SIS900_adjust_pci_device:
		1116	;*****Get current setting**********************
		1117	mov al, 2 ;read a word
		1118	mov bh, [pci_dev]
		1119	mov ah, [pci_bus]
		1120	mov bl, 0x04 ;from command Register
		1121	call pci_read_reg
		1122	;****see if its already set as bus master******
		1123	mov bx, ax
		1124	and bx,5
		1125	cmp bx,5
		1126	je SIS900_adjust_pci_device_Latency
		1127	;****Make card a bus master*****
		1128	mov cx, ax ;value to write
		1129	mov bh, [pci_dev]
		1130	mov al, 2 ;write a word
		1131	or cx,5
		1132	mov ah, [pci_bus]
		1133	mov bl, 0x04 ;to command register
		1134	call pci_write_reg
		1135	;****Check latency setting*********
		1136	SIS900_adjust_pci_device_Latency:
		1137	;*****Get current latency setting**********************
		1138	mov al, 1 ;read a byte
		1139	mov bh, [pci_dev]
		1140	mov ah, [pci_bus]
		1141	mov bl, 0x0D ;from Lantency Timer Register
		1142	call pci_read_reg
		1143	;****see if its aat least 64 clocks******
		1144	cmp ax,64
		1145	jge SIS900_adjust_pci_device_Done
		1146	;****Set latency to 32 clocks*****
		1147	mov cx, 64 ;value to write
		1148	mov bh, [pci_dev]
		1149	mov al, 1 ;write a byte
		1150	mov ah, [pci_bus]
		1151	mov bl, 0x0D ;to Lantency Timer Register
		1152	call pci_write_reg
		1153	;****Check latency setting*********
		1154	SIS900_adjust_pci_device_Done:
		1155	ret

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(root)/kernel/trunk/network/eth_drv/drivers/sis900.inc – Rev 593