Subversion Repositories Kolibri OS

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;                                                                    ;;

;; Copyright (C) KolibriOS team 2004-2014. All rights reserved.       ;;

;; Distributed under terms of the GNU General Public License          ;;

;;                                                                    ;;

;;  Ethernet driver for KolibriOS                                     ;;

;;  This is an adaptation of MenuetOS driver with minimal changes.    ;;

;;  Changes were made by CleverMouse. Original copyright follows.     ;;

;;                                                                    ;;

;;  This driver is based on the SIS900 driver from                    ;;

;;  the etherboot 5.0.6 project. The copyright statement is           ;;

;;                                                                    ;;

;;          GNU GENERAL PUBLIC LICENSE                                ;;

;;             Version 2, June 1991                                   ;;

;;                                                                    ;;

;;  remaining parts Copyright 2004 Jason Delozier,                    ;;

;;   cordata51@hotmail.com                                            ;;

;;                                                                    ;;

;;  See file COPYING for details                                      ;;

;;                                                                    ;;

;;  Updates:                                                          ;;

;;    Revision Look up table and SIS635 Mac Address by Jarek Pelczar  ;;

;;                                                                    ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

format MS COFF

        NUM_RX_DESC             = 4             ; Number of RX descriptors

        NUM_TX_DESC             = 4             ; Number of TX descriptors

        RX_BUFF_SZ              = 1520          ; Buffer size for each Rx buffer

        TX_BUFF_SZ              = 1516          ; Buffer size for each Tx buffer

        MAX_ETH_FRAME_SIZE      = 1516

        API_VERSION             = 0x01000100

        DRIVER_VERSION          = 5

        MAX_DEVICES             = 16

        DEBUG                   = 1

        __DEBUG__               = 1

        __DEBUG_LEVEL__         = 2

        DSIZE                   = 0x00000fff

        CRC_SIZE                = 4

        RFADDR_shift            = 16

; If you are having problems sending/receiving packet try changing the

; Max DMA Burst, Possible settings are as follows:

;

; 0x00000000 = 512 bytes

; 0x00100000 = 4 bytes

; 0x00200000 = 8 bytes

; 0x00300000 = 16 bytes

; 0x00400000 = 32 bytes

; 0x00500000 = 64 bytes

; 0x00600000 = 128 bytes

; 0x00700000 = 256 bytes

        RX_DMA                  = 0x00600000

        TX_DMA                  = 0x00600000

;-------------------------------------------------------------------------------------------------

; Symbolic offsets to registers.

        cr              = 0x0           ; Command Register

        cfg             = 0x4           ; Configuration Register

        mear            = 0x8           ; EEPROM Access Register

        ptscr           = 0xc           ; PCI Test Control Register

        isr             = 0x10          ; Interrupt Status Register

        imr             = 0x14          ; Interrupt Mask Register

        ier             = 0x18          ; Interrupt Enable Register

        epar            = 0x18          ; Enhanced PHY Access Register

        txdp            = 0x20          ; Transmit Descriptor Pointer Register

        txcfg           = 0x24          ; Transmit Configuration Register

        rxdp            = 0x30          ; Receive Descriptor Pointer Register

        rxcfg           = 0x34          ; Receive Configuration Register

        flctrl          = 0x38          ; Flow Control Register

        rxlen           = 0x3c          ; Receive Packet Length Register

        rfcr            = 0x48          ; Receive Filter Control Register

        rfdr            = 0x4C          ; Receive Filter Data Register

        pmctrl          = 0xB0          ; Power Management Control Register

        pmer            = 0xB4          ; Power Management Wake-up Event Register

; Command Register Bits

        RELOAD          = 0x00000400

        ACCESSMODE      = 0x00000200

        RESET           = 0x00000100

        SWI             = 0x00000080

        RxRESET         = 0x00000020

        TxRESET         = 0x00000010

        RxDIS           = 0x00000008

        RxENA           = 0x00000004

        TxDIS           = 0x00000002

        TxENA           = 0x00000001

; Configuration Register Bits

        DESCRFMT        = 0x00000100    ; 7016 specific

        REQALG          = 0x00000080

        SB              = 0x00000040

        POW             = 0x00000020

        EXD             = 0x00000010

        PESEL           = 0x00000008

        LPM             = 0x00000004

        BEM             = 0x00000001

        RND_CNT         = 0x00000400

        FAIR_BACKOFF    = 0x00000200

        EDB_MASTER_EN   = 0x00002000

; Eeprom Access Reigster Bits

        MDC             = 0x00000040

        MDDIR           = 0x00000020

        MDIO            = 0x00000010    ; 7016 specific

        EECS            = 0x00000008

        EECLK           = 0x00000004

        EEDO            = 0x00000002

        EEDI            = 0x00000001

; TX Configuration Register Bits

        ATP             = 0x10000000    ; Automatic Transmit Padding

        MLB             = 0x20000000    ; Mac Loopback Enable

        HBI             = 0x40000000    ; HeartBeat Ignore (Req for full-dup)

        CSI             = 0x80000000    ; CarrierSenseIgnore (Req for full-du

; RX Configuration Register Bits

        AJAB            = 0x08000000    ;

        ATX             = 0x10000000    ; Accept Transmit Packets

        ARP             = 0x40000000    ; accept runt packets (<64bytes)

        AEP             = 0x80000000    ; accept error packets

; Interrupt Register Bits

        WKEVT           = 0x10000000

        TxPAUSEEND      = 0x08000000

        TxPAUSE         = 0x04000000

        TxRCMP          = 0x02000000    ; Transmit Reset Complete

        RxRCMP          = 0x01000000    ; Receive Reset Complete

        DPERR           = 0x00800000

        SSERR           = 0x00400000

        RMABT           = 0x00200000

        RTABT           = 0x00100000

        RxSOVR          = 0x00010000

        HIBERR          = 0x00008000

        SWINT           = 0x00001000

        MIBINT          = 0x00000800

        TxURN           = 0x00000400

        TxIDLE          = 0x00000200

        TxERR           = 0x00000100

        TxDESC          = 0x00000080

        TxOK            = 0x00000040

        RxORN           = 0x00000020

        RxIDLE          = 0x00000010

        RxEARLY         = 0x00000008

        RxERR           = 0x00000004

        RxDESC          = 0x00000002

        RxOK            = 0x00000001

; Interrupt Enable Register Bits

        IE              = RxOK + TxOK

; Revision ID

        SIS900B_900_REV         = 0x03

        SIS630A_900_REV         = 0x80

        SIS630E_900_REV         = 0x81

        SIS630S_900_REV         = 0x82

        SIS630EA1_900_REV       = 0x83

        SIS630ET_900_REV        = 0x84

        SIS635A_900_REV         = 0x90

        SIS900_960_REV          = 0x91

; Receive Filter Control Register Bits

        RFEN            = 0x80000000            ; enable

        RFAAB           = 0x40000000            ; accept all broadcasts

        RFAAM           = 0x20000000            ; accept all multicasts

        RFAAP           = 0x10000000            ; accept all packets

; Reveive Filter Data Mask

        RFDAT           = 0x0000FFFF

; Eeprom Address

        EEPROMSignature = 0x00

        EEPROMVendorID  = 0x02

        EEPROMDeviceID  = 0x03

        EEPROMMACAddr   = 0x08

        EEPROMChecksum  = 0x0b

; The EEPROM commands include the alway-set leading bit.

        EEread          = 0x0180

        EEwrite         = 0x0140

        EEerase         = 0x01C0

        EEwriteEnable   = 0x0130

        EEwriteDisable  = 0x0100

        EEeraseAll      = 0x0120

        EEwriteAll      = 0x0110

        EEaddrMask      = 0x013F

        EEcmdShift      = 16

; For SiS962 or SiS963, request the eeprom software access

        EEREQ           = 0x00000400

        EEDONE          = 0x00000200

        EEGNT           = 0x00000100

include '../struct.inc'

include '../macros.inc'

include '../proc32.inc'

include '../imports.inc'

include '../fdo.inc'

include '../netdrv.inc'

public START

public version

virtual at ebx

        device:

        ETH_DEVICE

        .io_addr        dd ?

        .pci_bus        dd ?

        .pci_dev        dd ?

        .irq_line       db ?

        .cur_rx         db ?

        .cur_tx         db ?

        .last_tx        db ?

        .pci_revision   db ?

        .table_entries  db ?

        rb 2    ; alignment

        .txd            rd (4 * NUM_TX_DESC)

        .rxd            rd (4 * NUM_RX_DESC)

        .size = $ - device

end virtual

macro   ee_delay {

        push    eax

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        in      eax, dx

        pop     eax

}

section '.flat' code readable align 16

; Driver entry point - register our service when the driver is loading.

; TODO: add needed operations when unloading

START:

        cmp     dword [esp+4], 1

        jne     .exit

        stdcall RegService, my_service, service_proc

        ret     4

  .exit:

        xor     eax, eax

        ret     4

; Service procedure for the driver - handle all I/O requests for the driver.

; Currently handled requests are: SRV_GETVERSION = 0 and SRV_HOOK = 1.

service_proc:

; 1. Get parameter from the stack: [esp+4] is the first parameter,

;       pointer to IOCTL structure.

        mov     edx, [esp+4]    ; edx -> IOCTL

; 2. Get request code and select a handler for the code.

        mov     eax, [edx + IOCTL.io_code]

        test    eax, eax        ; check for SRV_GETVERSION

        jnz     @f

; 3. This is SRV_GETVERSION request, no input, 4 bytes output, API_VERSION.

; 3a. Output size must be at least 4 bytes.

        cmp     [edx + IOCTL.out_size], 4

        jb      .fail

; 3b. Write result to the output buffer.

        mov     eax, [edx + IOCTL.output]

        mov     [eax], dword API_VERSION

; 3c. Return success.

        xor     eax, eax

        ret     4

  @@:

        dec     eax     ; check for SRV_HOOK

        jnz     .fail

; 4. This is SRV_HOOK request, input defines the device to hook, no output.

; 4a. The driver works only with PCI devices,

;       so input must be at least 3 bytes long.

        cmp     [edx + IOCTL.inp_size], 3

        jb      .fail

; 4b. First byte of input is bus type, 1 stands for PCI.

        mov     eax, [edx + IOCTL.input]

        cmp     byte [eax], 1

        jne     .fail

; 4c. Second and third bytes of the input define the device: bus and dev.

;       Word in bx holds both bytes.

        mov     bx, [eax+1]

; 4d. Check if the device was already hooked,

;       scan through the list of known devices.

; check if the device is already listed

        mov     esi, device_list

        mov     ecx, [devices]

        test    ecx, ecx

        jz      .firstdevice

;        mov     eax, [edx + IOCTL.input]               ; get the pci bus and device numbers

        mov     ax, [eax+1]                            ;

  .nextdevice:

        mov     ebx, [esi]

        cmp     al, byte[device.pci_bus]

        jne     @f

        cmp     ah, byte[device.pci_dev]

        je      .find_devicenum                         ; Device is already loaded, let's find it's device number

       @@:

        add     esi, 4

        loop    .nextdevice

; 4e. This device doesn't have its own eth_device structure yet, let's create one

  .firstdevice:

; 4f. Check that we have place for new device.

        cmp     [devices], MAX_DEVICES

        jae     .fail

; 4g. Allocate memory for device descriptor and receive+transmit buffers.

; 4h. Zero the structure.

        allocate_and_clear ebx, device.size, .fail

; 4i. Save PCI coordinates

        mov     eax, [edx + IOCTL.input]

        movzx   ecx, byte[eax+1]

        mov     [device.pci_bus], ecx

        movzx   ecx, byte[eax+2]

        mov     [device.pci_dev], ecx

; 4j. Fill in the direct call addresses into the struct.

        mov     [device.reset], reset

        mov     [device.transmit], transmit

        mov     [device.unload], unload

        mov     [device.name], my_service

; 4k. Now, it's time to find the base io addres of the PCI device

; TODO: implement check if bus and dev exist on this machine

; Now, it's time to find the base io addres of the PCI device

        PCI_find_io

; We've found the io address, find IRQ now

        PCI_find_irq

; 4m. Add new device to the list (required for int_handler).

        mov     eax, [devices]

        mov     [device_list+4*eax], ebx

        inc     [devices]

; 4m. Ok, the eth_device structure is ready, let's probe the device

        call    probe

        test    eax, eax

        jnz     .destroy

; 4n. If device was successfully initialized, register it for the kernel.

        mov     [device.type], NET_TYPE_ETH

        call    NetRegDev

        cmp     eax, -1

        je      .destroy

        ret     4

; 5. If the device was already loaded, find the device number and return it in eax

  .find_devicenum:

        call    NetPtrToNum                                             ; This kernel procedure converts a pointer to device struct in ebx

                                                                        ; into a device number in edi

        mov     eax, edi                                                ; Application wants it in eax instead

        ret     4

; If an error occured, remove all allocated data and exit (returning -1 in eax)

  .destroy:

        dec     [devices]

        ; todo: reset device into virgin state

  .err:

        stdcall KernelFree, ebx

  .fail:

        xor     eax, eax

        ret     4

;;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\;;

;;                                                                        ;;

;;        Actual Hardware dependent code starts here                      ;;

;;                                                                        ;;

;;/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\;;

unload:

        ; TODO: (in this particular order)

        ;

        ; - Stop the device

        ; - Detach int handler

        ; - Remove device from local list

        ; - call unregister function in kernel

        ; - Remove all allocated structures and buffers the card used

        or      eax,-1

ret

;***************************************************************************

;

; probe

;

; checks the card and enables it

;

; TODO: probe mii transceivers

;

;***************************************************************************

align 4

probe:

        DEBUGF  1, "Probe\n"

; wake up device   CHECKME

        stdcall PciWrite8, [device.pci_bus], [device.pci_dev], 0x40, 0

        PCI_make_bus_master

        PCI_adjust_latency 64

; Get Card Revision

        stdcall PciRead8, [device.pci_bus], [device.pci_dev], 0x08

        mov     [device.pci_revision], al       ; save the revision for later use

; Look up through the specific_table

        mov     esi, specific_table

  .tableloop:

        cmp     dword [esi], 0                  ; Check if we reached end of the list

        je      .notsupported

        cmp     al, [esi]                       ; Check if revision is OK

        je      .ok

        add     esi, 12                         ; Advance to next entry

        jmp     .tableloop

  .ok:

        call     dword[esi + 4]                 ; "get MAC" function

; Set table entries

        mov      [device.table_entries], 16

        cmp      [device.pci_revision], SIS635A_900_REV

        jae      @f

        cmp      [device.pci_revision], SIS900B_900_REV

        je       @f

        mov      [device.table_entries], 8

       @@:

; TODO: Probe for mii transceiver

        jmp     reset

  .notsupported:

        DEBUGF  1, "Device not supported\n"

        or      eax, -1

        ret

reset:

        DEBUGF  1, "reset\n"

        movzx   eax, [device.irq_line]

        stdcall AttachIntHandler, eax, int_handler, 0

;--------------------------------------------

; Disable Interrupts and reset Receive Filter

        set_io  0

        set_io  ier

        xor     eax, eax

        out     dx, eax

        set_io  imr

        out     dx, eax

        set_io  rfcr

        out     dx, eax

;-----------

; Reset Card

        set_io  cr

        in      eax, dx                         ; Get current Command Register

        or      eax, RESET + RxRESET + TxRESET  ; set flags

        out     dx, eax                         ; Write new Command Register

;----------

; Wait loop

        set_io  isr

        mov     ecx, 1000

  .loop:

        dec     ecx

        jz      .fail

        in      eax, dx                         ; read interrupt status

        test    eax, TxRCMP + RxRCMP

        jz      .loop

        DEBUGF  1, "status=%x\n", eax

;------------------------------------------------------

; Set Configuration Register depending on Card Revision

        set_io  cfg

        mov     eax, PESEL                      ; Configuration Register Bit

        cmp     [device.pci_revision], SIS635A_900_REV

        je      .match

        cmp     [device.pci_revision], SIS900B_900_REV ; Check card revision

        jne     .done

  .match:                                       ; Revision match

        or      eax, RND_CNT                    ; Configuration Register Bit

  .done:

        out     dx, eax

        DEBUGF  1, "Initialising RX Filter\n"

; Get Receive Filter Control Register

        set_io  rfcr

        in      eax, dx

        push    eax

; disable packet filtering before setting filter

        and     eax, not RFEN

        out     dx, eax

; load MAC addr to filter data register

        xor     ecx, ecx

  .macloop:

        mov     eax, ecx

        set_io  0

        set_io  rfcr

        shl     eax, 16                                             ; high word of eax tells card which mac byte to write

        out     dx, eax                                             ;

        set_io  rfdr

        mov     ax, word [device.mac + ecx*2]                       ; Get Mac ID word

        out     dx, ax                                              ; Send Mac ID

        inc     cl                                                  ; send next word

        cmp     cl, 3                                               ; more to send?

        jne     .macloop

; enable packet filtering

        pop     eax                     ; old register value

        set_io  rfcr

        or      eax, RFEN               ; enable filtering

        out     dx, eax                 ; set register

        DEBUGF  1, "Initialising TX Descriptors\n"

        mov     ecx, NUM_TX_DESC

        lea     esi, [device.txd]

  .txdescloop:

        lea     eax, [esi + 16]                 ; next ptr

        GetRealAddr

        mov     dword [esi], eax                ; link to next desc

        mov     dword [esi + 4], 0              ; status field

        mov     dword [esi + 8], 0              ; ptr to buffer

        add     esi, 16

        dec     ecx

        jnz     .txdescloop

        lea     eax, [device.txd]

        GetRealAddr

        mov     dword [esi - 16], eax           ; correct last descriptor link ptr

        set_io  txdp                            ; TX Descriptor Pointer

;        lea     eax, [device.txd]

;        GetRealAddr

        out     dx, eax

        mov     [device.cur_tx], 0              ; Set current tx descriptor to 0

        mov     [device.last_tx], 0

        DEBUGF  1, "Initialising RX Descriptors\n"

        mov     ecx, NUM_RX_DESC

        lea     esi, [device.rxd]

  .rxdescloop:

        lea     eax, [esi + 16]                 ; next ptr

        GetRealAddr

        mov     dword [esi], eax

        mov     dword [esi + 4], RX_BUFF_SZ     ; size

        push    ecx esi

        stdcall KernelAlloc, RX_BUFF_SZ

        pop     esi ecx

        test    eax, eax

        jz      .fail

        mov     dword [esi + 12], eax           ; address

        GetRealAddr

        mov     dword [esi + 8], eax            ; real address

        add     esi, 16

        dec     ecx

        jnz     .rxdescloop

        lea     eax, [device.rxd]

        GetRealAddr

        mov     dword [esi - 16], eax           ; correct last descriptor link ptr

        set_io  0

        set_io  rxdp

;        lea     eax, [device.rxd]

;        GetRealAddr

        out     dx, eax

        mov     [device.cur_rx], 0              ; Set current rx descriptor to 0

        DEBUGF  1, "setting RX mode\n"

        xor     cl, cl

  .rxfilterloop:

        set_io  0

        set_io  rfcr                    ; Receive Filter Control Reg offset

        mov     eax, 4                  ; determine table entry

        add     al, cl

        shl     eax, 16

        out     dx, eax                 ; tell card which entry to modify

        set_io  rfdr                    ; Receive Filter Control Reg offset

        mov     eax, 0xffff             ; entry value

        out     dx, ax                  ; write value to table in card

        inc     cl                      ; next entry

        cmp     cl, [device.table_entries]

        jb      .rxfilterloop

        set_io  rfcr                    ; Receive Filter Control Register offset

        mov     eax, RFAAB + RFAAM + RFAAP + RFEN

        out     dx, eax

        set_io  rxcfg                   ; Receive Config Register offset

        mov     eax, ATX + RX_DMA + 2   ; 0x2 : RX Drain Threshold = 8*8=64 bytes

        out     dx, eax

        DEBUGF  1, "setting TX mode\n"

        set_io  txcfg                   ; Transmit config Register offset

        mov     eax, ATP + HBI + CSI + TX_DMA + 0x120

                                        ; TX Fill threshold = 0x100

                                        ; TX Drain Threshold = 0x20

        out     dx, eax

        DEBUGF  1, "Enabling interrupts\n"

        set_io  imr

        mov     eax, IE                 ; Interrupt enable mask

        out     dx, eax

        set_io  cr

        in      eax, dx

        or      eax, RxENA              ; Enable Receive

        out     dx, eax

        set_io  ier                     ; Interrupt enable

        mov     eax, 1

        out     dx, eax

        mov     [device.mtu], 1514

; Set link state to unknown

        mov     [device.state], ETH_LINK_UNKOWN

        xor     eax, eax

        ret

  .fail:

        DEBUGF  1, "Resetting device failed\n"

        or      eax, -1

        ret

;***************************************************************************

;

; SIS960_get_mac_addr: - Get MAC address for SiS962 or SiS963 model

;

; SiS962 or SiS963 model, use EEPROM to store MAC address.

; EEPROM is shared by LAN and 1394.

; When access EEPROM, send EEREQ signal to hardware first, and wait for EEGNT.

; If EEGNT is ON, EEPROM is permitted to be accessed by LAN, otherwise is not.

; After MAC address is read from EEPROM, send

; EEDONE signal to refuse EEPROM access by LAN.

; The EEPROM map of SiS962 or SiS963 is different to SiS900.

; The signature field in SiS962 or SiS963 spec is meaningless.

;

; Return 0 is EAX = failure

;

;***************************************************************************

align 4

SIS960_get_mac_addr:

        DEBUGF  1, "SIS960 - get mac: "

;-------------------------------

; Send Request for eeprom access

        set_io  0

        set_io  mear            ; Eeprom access register

        mov     eax, EEREQ      ; Request access to eeprom

        out     dx, eax         ; Send request

;-----------------------------------------------------

; Loop 4000 times and if access not granted, error out

        mov     ecx, 4000

  .loop:

        in      eax, dx         ; get eeprom status

        test    eax, EEGNT      ; see if eeprom access granted flag is set

        jnz     .got_access     ; if it is, go access the eeprom

        loop    .loop           ; else keep waiting

        DEBUGF  1, "Access to EEprom failed!\n", 0

        set_io  mear            ; Eeprom access register

        mov     eax, EEDONE     ; tell eeprom we are done

        out     dx, eax

        or      eax, -1         ; error

        ret

  .got_access:

;------------------------------------------

; EEprom access granted, read MAC from card

    ; zero based so 3-16 bit reads will take place

        mov     ecx, 2

  .read_loop:

        mov     eax, EEPROMMACAddr      ; Base Mac Address

        add     eax, ecx                ; Current Mac Byte Offset

        push    ecx

        call    read_eeprom             ; try to read 16 bits

        pop     ecx

        mov     word [device.mac+ecx*2], ax     ; save 16 bits to the MAC ID varible

        dec     ecx                     ; one less word to read

        jns     .read_loop              ; if more read more

        mov     eax, 1                  ; return non-zero indicating success

        DEBUGF  2,"%x-%x-%x-%x-%x-%x\n",[device.mac]:2,[device.mac+1]:2,[device.mac+2]:2,[device.mac+3]:2,[device.mac+4]:2,[device.mac+5]:2

;-------------------------------------

; Tell EEPROM We are Done Accessing It

  .done:

        set_io  0

        set_io  mear            ; Eeprom access register

        mov     eax, EEDONE     ; tell eeprom we are done

        out     dx, eax

        xor     eax, eax        ; ok

        ret

;***************************************************************************

;

; get_mac_addr: - Get MAC address for stand alone SiS900 model

;

; Older SiS900 and friends, use EEPROM to store MAC address.

;

;***************************************************************************

align 4

SIS900_get_mac_addr:

        DEBUGF  1, "SIS900 - get mac: "

;------------------------------------

; check to see if we have sane EEPROM

        mov     eax, EEPROMSignature  ; Base Eeprom Signature

        call    read_eeprom           ; try to read 16 bits

        cmp     ax, 0xffff

        je      .err

        test    ax, ax

        je      .err

;-----------

; Read MacID

; zero based so 3-16 bit reads will take place

        mov     ecx, 2

  .loop:

        mov     eax, EEPROMMACAddr      ; Base Mac Address

        add     eax, ecx                ; Current Mac Byte Offset

        push    ecx

        call    read_eeprom             ; try to read 16 bits

        pop     ecx

        mov     word [device.mac+ecx*2], ax     ; save 16 bits to the MAC ID storage

        dec     ecx                             ; one less word to read

        jns     .loop                           ; if more read more

        DEBUGF  2,"%x-%x-%x-%x-%x-%x\n",[device.mac]:2,[device.mac+1]:2,[device.mac+2]:2,[device.mac+3]:2,[device.mac+4]:2,[device.mac+5]:2

        xor     eax, eax

        ret

  .err:

        DEBUGF  1, "Access to EEprom failed!\n", 0

        or      eax, -1

        ret

;***************************************************************************

;

; Get_Mac_SIS635_900_REV: - Get MAC address for model 635

;

;***************************************************************************

align 4

Get_Mac_SIS635_900_REV:

        DEBUGF  1, "SIS635 - get mac: "

        set_io  0

        set_io  rfcr

        in      eax, dx

        mov     esi, eax

        set_io  cr

        or      eax, RELOAD

        out     dx, eax

        xor     eax, eax

        out     dx, eax

;-----------------------------------------------

; Disable packet filtering before setting filter

        set_io  rfcr

        mov     eax, esi

        and     eax, not RFEN

        out     dx, eax

;---------------------------------

; Load MAC to filter data register

        xor     ecx, ecx

        lea     edi, [device.mac]

  .loop:

        set_io  0

        set_io  rfcr

        mov     eax, ecx

        shl     eax, RFADDR_shift

        out     dx, eax

        set_io  rfdr

        in      ax, dx

        stosw

        inc     ecx

        cmp     ecx, 3

        jb      .loop

;------------------------

; Enable packet filtering

        set_io  rfcr

        mov     eax, esi

        or      eax, RFEN

        out     dx, eax

        DEBUGF  2,"%x-%x-%x-%x-%x-%x\n",[device.mac]:2,[device.mac+1]:2,[device.mac+2]:2,[device.mac+3]:2,[device.mac+4]:2,[device.mac+5]:2

        xor     eax, eax

        ret

;***************************************************************************

;

; read_eeprom

;

; reads and returns a given location from EEPROM

;

; IN:  si = addr

; OUT: ax = data

;

;***************************************************************************

align 4

read_eeprom:

        set_io  0

        set_io  mear

        xor     eax, eax              ; start send

        out     dx, eax

        ee_delay

        or      eax, EECLK

        out     dx, eax

        ee_delay

;------------------------------------

; Send the read command

        or      esi, EEread

        mov     ecx, 1 shl 9

  .loop:

        mov     eax, EECS

        test    esi, ecx

        jz      @f

        or      eax, EEDI

       @@:

        out     dx, eax

        ee_delay

        or      eax, EECLK

        out     dx, eax

        ee_delay

        shr     esi, 1

        jnc     .loop

        mov     eax, EECS

        out     dx, eax

        ee_delay

;------------------------

; Read 16-bits of data in

        xor     esi, esi

        mov     cx, 16

  .loop2:

        mov     eax, EECS

        out     dx, eax

        ee_delay

        or      eax, EECLK

        out     dx, eax

        ee_delay

        in      eax, dx

        shl     esi, 1

        test    eax, EEDO

        jz      @f

        inc     esi

       @@:

        loop    .loop2

;----------------------------

; Terminate the EEPROM access

        xor     eax, eax

        out     dx, eax

        ee_delay

        mov     eax, EECLK

        out     dx, eax

        ee_delay

        movzx   eax, si

        ret

align 4

write_mac:

        DEBUGF  1,'Setting MAC is not supported for SIS900 card.\n'

        add     esp, 6

        ret

;***************************************************************************

;   Function

;      transmit

;   Description

;      Transmits a packet of data via the ethernet card

;         buffer pointer in [esp+4]

;         size of buffer in [esp+8]

;         pointer to device structure in ebx

;

;***************************************************************************

align 4

transmit:

        DEBUGF  1,"Transmitting packet, buffer:%x, size:%u\n",[esp+4],[esp+8]

        mov     eax, [esp+4]

        DEBUGF  1,"To: %x-%x-%x-%x-%x-%x From: %x-%x-%x-%x-%x-%x Type:%x%x\n",\

        [eax+00]:2,[eax+01]:2,[eax+02]:2,[eax+03]:2,[eax+04]:2,[eax+05]:2,\

        [eax+06]:2,[eax+07]:2,[eax+08]:2,[eax+09]:2,[eax+10]:2,[eax+11]:2,\

        [eax+13]:2,[eax+12]:2

        cmp     dword [esp + 8], MAX_ETH_FRAME_SIZE

        ja      .error

        cmp     dword [esp + 8], 60

        jb      .error

        movzx   ecx, [device.cur_tx]

        shl     ecx, 4                  ; *16

        lea     ecx, [device.txd + ecx]

        test    dword [ecx + 4], 0x80000000     ; card owns descriptor ?

        jnz     .error

        mov     eax, [esp + 4]

        mov     dword [ecx + 12], eax

        GetRealAddr

        mov     dword [ecx + 8], eax    ; buffer address

        mov     eax, [esp + 8]

        and     eax, DSIZE

        or      eax, 0x80000000         ; card owns descriptor

        mov     dword [ecx + 4], eax    ; status field

        set_io  0

        set_io  cr

        in      eax, dx

        or      eax, TxENA              ; Enable the transmit state machine

        out     dx, eax

        inc     [device.cur_tx]

        and     [device.cur_tx], NUM_TX_DESC-1

; update stats

        mov     ecx, [esp + 8]

        inc     [device.packets_tx]

        add     dword [device.bytes_tx], ecx

        adc     dword [device.bytes_tx + 4], 0

  .finish:

        DEBUGF  1,"Packet sent!\n"

        xor     eax, eax

        ret     8

  .error:

        DEBUGF  1,"ERROR!\n"

        stdcall KernelFree, [esp+4]

        or      eax, -1

        ret     8

;***************************************************************************

;

; int_handler

;

; handles received IRQs, which signal received packets

;

; Currently only supports one descriptor per packet, if packet is fragmented

; between multiple descriptors you will lose part of the packet

;

;***************************************************************************

align 4

int_handler:

        push    ebx esi edi

        DEBUGF  1,"\n%s int\n", my_service

; find pointer of device which made IRQ occur

        mov     ecx, [devices]

        test    ecx, ecx

        jz      .nothing

        mov     esi, device_list

  .nextdevice:

        mov     ebx, [esi]

        set_io  0

        set_io  isr

        in      eax, dx                 ; note that this clears all interrupts

        test    ax, IE

        jnz     .got_it

  .continue:

        add     esi, 4

        dec     ecx

        jnz     .nextdevice

  .nothing:

        pop     edi esi ebx

        xor     eax, eax

        ret

  .got_it:

        DEBUGF  1,"Device: %x Status: %x ", ebx, ax

        test    ax, RxOK

        jz      .no_rx_

        push    ax

  .rx_loop:

;-----------

; Get Status

        movzx   eax, [device.cur_rx]                    ; find current descriptor

        shl     eax, 4                                  ; * 16

        mov     ecx, dword[device.rxd + eax + 4]        ; get receive status

;-------------------------------------------

; Check RX_Status to see if packet is waiting

        test    ecx, 0x80000000

        jz      .no_rx

;----------------------------------------------

; There is a packet waiting check it for errors

        test    ecx, 0x67C0000                  ; see if there are any errors

        jnz     .error_status

;---------------------

; Check size of packet

        and     ecx, DSIZE                      ; get packet size minus CRC

        sub     ecx, CRC_SIZE                   ; make sure packet contains data

        jbe     .error_size

; update statistics

        inc     dword [device.packets_rx]

        add     dword [device.bytes_rx], ecx

        adc     dword [device.bytes_rx + 4], 0

        push    ebx

        push    .return

        push    ecx                             ; packet size

        pushd   [device.rxd + eax + 12]         ; packet ptr

        DEBUGF  1, "Packet received OK\n"

        jmp     Eth_input

  .return:

        pop     ebx

; Reset status, allow ethernet card access to descriptor

        stdcall KernelAlloc, RX_BUFF_SZ