Subversion Repositories Kolibri OS

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;;                                                                 ;;

;; Copyright (C) KolibriOS team 2004-2013. All rights reserved.    ;;

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

;;                                                                 ;;

;;  Realtek 8139 driver for KolibriOS                              ;;

;;                                                                 ;;

;;  based on RTL8139.asm driver for menuetos                       ;;

;;  and realtek8139.asm for SolarOS by Eugen Brasoveanu            ;;

;;                                                                 ;;

;;    Written by hidnplayr@kolibrios.org                           ;;

;;                                                                 ;;

;;          GNU GENERAL PUBLIC LICENSE                             ;;

;;             Version 2, June 1991                                ;;

;;                                                                 ;;

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

format MS COFF

        API_VERSION             = 0x01000100

        DRIVER_VERSION          = 5

        MAX_DEVICES             = 16

        RBLEN                   = 3 ; Receive buffer size: 0==8K 1==16k 2==32k 3==64k

        NUM_TX_DESC             = 4

        DEBUG                   = 1

        __DEBUG__               = 1

        __DEBUG_LEVEL__         = 1

include 'proc32.inc'

include 'imports.inc'

include 'fdo.inc'

include '../struct.inc'

include 'netdrv.inc'

public START

public service_proc

public version

        REG_IDR0                = 0x00

        REG_MAR0                = 0x08 ; multicast filter register 0

        REG_MAR4                = 0x0c ; multicast filter register 4

        REG_TSD0                = 0x10 ; transmit status of descriptor

        REG_TSAD0               = 0x20 ; transmit start address of descriptor

        REG_RBSTART             = 0x30 ; RxBuffer start address

        REG_COMMAND             = 0x37 ; command register

        REG_CAPR                = 0x38 ; current address of packet read (word) R/W

        REG_IMR                 = 0x3c ; interrupt mask register

        REG_ISR                 = 0x3e ; interrupt status register

        REG_TXCONFIG            = 0x40 ; transmit configuration register

        REG_RXCONFIG            = 0x44 ; receive configuration register 0

        REG_MPC                 = 0x4c ; missed packet counter

        REG_9346CR              = 0x50 ; serial eeprom 93C46 command register

        REG_CONFIG1             = 0x52 ; configuration register 1

        REG_MSR                 = 0x58

        REG_CONFIG4             = 0x5a ; configuration register 4

        REG_HLTCLK              = 0x5b ; undocumented halt clock register

        REG_BMCR                = 0x62 ; basic mode control register

        REG_ANAR                = 0x66 ; auto negotiation advertisement register

        REG_9346CR_WE           = 11b SHL 6

        BIT_RUNT                = 4 ; total packet length < 64 bytes

        BIT_LONG                = 3 ; total packet length > 4k

        BIT_CRC                 = 2 ; crc error occured

        BIT_FAE                 = 1 ; frame alignment error occured

        BIT_ROK                 = 0 ; received packet is ok

        BIT_RST                 = 4 ; reset bit

        BIT_RE                  = 3 ; receiver enabled

        BIT_TE                  = 2 ; transmitter enabled

        BUFE                    = 1 ; rx buffer is empty, no packet stored

        BIT_ISR_TOK             = 2 ; transmit ok

        BIT_ISR_RER             = 1 ; receive error interrupt

        BIT_ISR_ROK             = 0 ; receive ok

        BIT_TX_MXDMA            = 8 ; Max DMA burst size per Tx DMA burst

        BIT_TXRR                = 4 ; Tx Retry count 16+(TXRR*16)

        BIT_RXFTH               = 13 ; Rx fifo threshold

        BIT_RBLEN               = 11 ; Ring buffer length indicator

        BIT_RX_MXDMA            = 8 ; Max DMA burst size per Rx DMA burst

        BIT_NOWRAP              = 7 ; transfered data wrapping

        BIT_9356SEL             = 6 ; eeprom selector 9346/9356

        BIT_AER                 = 5 ; accept error packets

        BIT_AR                  = 4 ; accept runt packets

        BIT_AB                  = 3 ; accept broadcast packets

        BIT_AM                  = 2 ; accept multicast packets

        BIT_APM                 = 1 ; accept physical match packets

        BIT_AAP                 = 0 ; accept all packets

        BIT_93C46_EEM1          = 7 ; RTL8139 eeprom operating mode1

        BIT_93C46_EEM0          = 6 ; RTL8139 eeprom operating mode0

        BIT_93C46_EECS          = 3 ; chip select

        BIT_93C46_EESK          = 2 ; serial data clock

        BIT_93C46_EEDI          = 1 ; serial data input

        BIT_93C46_EEDO          = 0 ; serial data output

        BIT_LWACT               = 4 ; see REG_CONFIG1

        BIT_SLEEP               = 1 ; sleep bit at older chips

        BIT_PWRDWN              = 0 ; power down bit at older chips

        BIT_PMEn                = 0 ; power management enabled

        BIT_LWPTN               = 2 ; see REG_CONFIG4

        BIT_ERTXTH              = 16 ; early TX threshold

        BIT_TOK                 = 15 ; transmit ok

        BIT_OWN                 = 13 ; tx DMA operation is completed

        BIT_ANE                 = 12 ; auto negotiation enable

        BIT_TXFD                = 8 ; 100base-T full duplex

        BIT_TX                  = 7 ; 100base-T

        BIT_10FD                = 6 ; 10base-T full duplex

        BIT_10                  = 5 ; 10base-T

        BIT_SELECTOR            = 0 ; binary encoded selector CSMA/CD=00001

        BIT_IFG1                = 25

        BIT_IFG0                = 24

        TXRR                    = 8 ; total retries = 16+(TXRR*16)

        TX_MXDMA                = 6 ; 0=16 1=32 2=64 3=128 4=256 5=512 6=1024 7=2048

        ERTXTH                  = 8 ; in unit of 32 bytes e.g:(8*32)=256

        RX_MXDMA                = 7 ; 0=16 1=32 2=64 3=128 4=256 5=512 6=1024 7=unlimited

        RXFTH                   = 7 ; 0=16 1=32 2=64 3=128 4=256 5=512 6=1024 7=no threshold

        RX_CONFIG               = (RBLEN shl BIT_RBLEN) or \

                                  (RX_MXDMA shl BIT_RX_MXDMA) or \

                                  (1 shl BIT_NOWRAP) or \

                                  (RXFTH shl BIT_RXFTH) or\

                                  (1 shl BIT_AB) or \                 ; Accept broadcast packets

                                  (1 shl BIT_APM) or \                ; Accept physical match packets

                                  (1 shl BIT_AER) or \                ; Accept error packets

                                  (1 shl BIT_AR) or \                 ; Accept Runt packets (smaller then 64 bytes)

                                  (1 shl BIT_AM)                      ; Accept multicast packets

        RX_BUFFER_SIZE          = (8192 shl RBLEN);+16

        MAX_ETH_FRAME_SIZE      = 1514

        EE_93C46_REG_ETH_ID     = 7 ; MAC offset

        EE_93C46_READ_CMD       = (6 shl 6) ; 110b + 6bit address

        EE_93C56_READ_CMD       = (6 shl 8) ; 110b + 8bit address

        EE_93C46_CMD_LENGTH     = 9  ; start bit + cmd + 6bit address

        EE_93C56_CMD_LENGTH     = 11 ; start bit + cmd + 8bit ddress

        VER_RTL8139             = 1100000b

        VER_RTL8139A            = 1110000b

        VER_RTL8139AG           = 1110100b

        VER_RTL8139B            = 1111000b

        VER_RTL8130             = VER_RTL8139B

        VER_RTL8139C            = 1110100b

        VER_RTL8100             = 1111010b

        VER_RTL8100B            = 1110101b

        VER_RTL8139D            = VER_RTL8100B

        VER_RTL8139CP           = 1110110b

        VER_RTL8101             = 1110111b

        IDX_RTL8139             = 0

        IDX_RTL8139A            = 1

        IDX_RTL8139B            = 2

        IDX_RTL8139C            = 3

        IDX_RTL8100             = 4

        IDX_RTL8139D            = 5

        IDX_RTL8139D            = 6

        IDX_RTL8101             = 7

        ISR_SERR                = 1 SHL 15

        ISR_TIMEOUT             = 1 SHL 14

        ISR_LENCHG              = 1 SHL 13

        ISR_FIFOOVW             = 1 SHL 6

        ISR_PUN                 = 1 SHL 5

        ISR_RXOVW               = 1 SHL 4

        ISR_TER                 = 1 SHL 3

        ISR_TOK                 = 1 SHL 2

        ISR_RER                 = 1 SHL 1

        ISR_ROK                 = 1 SHL 0

        INTERRUPT_MASK          = ISR_ROK or \

                                  ISR_RXOVW or \

                                  ISR_PUN or \

                                  ISR_FIFOOVW or \

                                  ISR_LENCHG or \

                                  ISR_TOK or \

                                  ISR_TER

        TSR_OWN                 = 1 SHL 13

        TSR_TUN                 = 1 SHL 14

        TSR_TOK                 = 1 SHL 15

        TSR_CDH                 = 1 SHL 28

        TSR_OWC                 = 1 SHL 29

        TSR_TABT                = 1 SHL 30

        TSR_CRS                 = 1 SHL 31

virtual at ebx

        device:

        ETH_DEVICE

        .rx_buffer      dd ?

        .tx_buffer      dd ?

        .rx_data_offset dd ?

        .io_addr        dd ?

        .curr_tx_desc   db ?

        .pci_bus        dd ?

        .pci_dev        dd ?

        .irq_line       db ?

        .hw_ver_id      db ?

        .TX_DESC        rd NUM_TX_DESC

        .size = $ - device

end virtual

section '.flat' code readable align 16

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

;;                        ;;

;; proc START             ;;

;;                        ;;

;; (standard driver proc) ;;

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

align 4

proc START stdcall, state:dword

        cmp     [state], 1

        jne     .exit

  .entry:

        DEBUGF  2, "Loading %s driver\n", my_service

        stdcall RegService, my_service, service_proc

        ret

  .fail:

  .exit:

        xor     eax, eax

        ret

endp

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

;;                        ;;

;; proc SERVICE_PROC      ;;

;;                        ;;

;; (standard driver proc) ;;

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

align 4

proc service_proc stdcall, ioctl:dword

        mov     edx, [ioctl]

        mov     eax, [IOCTL.io_code]

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

        cmp     eax, 0 ;SRV_GETVERSION

        jne     @F

        cmp     [IOCTL.out_size], 4

        jb      .fail

        mov     eax, [IOCTL.output]

        mov     [eax], dword API_VERSION

        xor     eax, eax

        ret

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

  @@:

        cmp     eax, 1 ;SRV_HOOK

        jne     .fail

        cmp     [IOCTL.inp_size], 3                     ; Data input must be at least 3 bytes

        jb      .fail

        mov     eax, [IOCTL.input]

        cmp     byte [eax], 1                           ; 1 means device number and bus number (pci) are given

        jne     .fail                                   ; other types arent supported for this card yet

; check if the device is already listed

        mov     esi, device_list

        mov     ecx, [devices]

        test    ecx, ecx

        jz      .firstdevice

        mov     ax , [eax+1]                            ; get the pci bus and device numbers

  .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

; This device doesnt have its own eth_device structure yet, lets create one

  .firstdevice:

        cmp     [devices], MAX_DEVICES                  ; First check if the driver can handle one more card

        jae     .fail

        allocate_and_clear ebx, device.size, .fail      ; Allocate the buffer for device structure

; Fill in the direct call addresses into the struct

        mov     [device.reset], reset

        mov     [device.transmit], transmit

        mov     [device.get_MAC], read_mac

        mov     [device.set_MAC], write_mac

        mov     [device.unload], unload

        mov     [device.name], my_service

; save the pci bus and device numbers

        mov     eax, [IOCTL.input]

        movzx   ecx, byte[eax+1]

        mov     [device.pci_bus], ecx

        movzx   ecx, byte[eax+2]

        mov     [device.pci_dev], ecx

; 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

        DEBUGF  2, "Hooking into device, dev:%x, bus:%x, irq:%x, addr:%x\n",\

        [device.pci_dev]:1,[device.pci_bus]:1,[device.irq_line]:1,[device.io_addr]:4

; Allocate the receive buffer

        stdcall CreateRingBuffer, dword (RX_BUFFER_SIZE), dword PG_SW

        test    eax, eax

        jz      .err

        mov     [device.rx_buffer], eax

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

        call    probe                                                   ; this function will output in eax

        test    eax, eax

        jnz     .err                                                    ; If an error occured, exit

        mov     eax, [devices]                                          ; Add the device structure to our device list

        mov     [device_list+4*eax], ebx                                ; (IRQ handler uses this list to find device)

        inc     [devices]                                               ;

        mov     [device.type], NET_TYPE_ETH

        call    NetRegDev

        cmp     eax, -1

        je      .destroy

        ret

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

  .find_devicenum:

        DEBUGF  2, "Trying to find device number of already registered device\n"

        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

        DEBUGF  2, "Kernel says: %u\n", eax

        ret

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

  .destroy:

        ; todo: reset device into virgin state

  .err:

        stdcall KernelFree, [device.rx_buffer]

        stdcall KernelFree, ebx

  .fail:

        or      eax, -1

        ret

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

endp

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

;;                                                                        ;;

;;        Actual Hardware dependent code starts here                      ;;

;;                                                                        ;;

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

align 4

unload:

        ; TODO: (in this particular order)

        ;

        ; - Stop the device

        ; - Detach int handler

        ; - Remove device from local list (RTL8139_LIST)

        ; - call unregister function in kernel

        ; - Remove all allocated structures and buffers the card used

        or      eax, -1

ret

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

;;

;;  probe: enables the device (if it really is RTL8139)

;;

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

align 4

probe:

        DEBUGF  2, "Probing %s device\n", my_service

        PCI_make_bus_master

; get chip version

        set_io  0

        set_io  REG_TXCONFIG + 2

        in      ax, dx

        shr     ah, 2

        shr     ax, 6

        and     al, 01111111b

        mov     ecx, HW_VER_ARRAY_SIZE-1

  .chip_ver_loop:

        cmp     al, [hw_ver_array + ecx]

        je      .chip_ver_found

        dec     ecx

        jns     .chip_ver_loop

  .unknown:

        mov     ecx, 8

  .chip_ver_found:

        cmp     ecx, 8

        ja      .unknown

        mov     [device.hw_ver_id], cl

        mov     ecx, [crosslist+ecx*4]

        mov     [device.name], ecx

        DEBUGF  2, "Chip version: %s\n", ecx

; wake up the chip

        set_io  0

        set_io  REG_HLTCLK

        mov     al, 'R'         ; run the clock

        out     dx, al

; unlock config and BMCR registers

        set_io  REG_9346CR

        mov     al, (1 shl BIT_93C46_EEM1) or (1 shl BIT_93C46_EEM0)

        out     dx, al

; enable power management

        set_io  REG_CONFIG1

        in      al, dx

        cmp     [device.hw_ver_id], IDX_RTL8139B

        jb      .old_chip

; set LWAKE pin to active high (default value).

; it is for Wake-On-LAN functionality of some motherboards.

; this signal is used to inform the motherboard to execute a wake-up process.

; only at newer chips.

        or      al, (1 shl BIT_PMEn)

        and     al, not (1 shl BIT_LWACT)

        out     dx, al

        set_io  REG_CONFIG4

        in      al, dx

        and     al, not (1 shl BIT_LWPTN)

        out     dx, al

        jmp     .finish_wake_up

  .old_chip:

; wake up older chips

        and     al, not ((1 shl BIT_SLEEP) or (1 shl BIT_PWRDWN))

        out     dx, al

  .finish_wake_up:

; lock config and BMCR registers

        xor     al, al

        set_io  0

        set_io  REG_9346CR

        out     dx, al

        DEBUGF  2, "done!\n"

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

;;

;;   reset: Set up all registers and descriptors, clear some values

;;

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

reset:

        DEBUGF  2, "Resetting\n"

; attach int handler

        movzx   eax, [device.irq_line]

        DEBUGF  1, "Attaching int handler to irq %x, ", eax:1

        stdcall AttachIntHandler, eax, int_handler, dword 0

        test    eax, eax

        jnz     @f

        DEBUGF  1, "\nCould not attach int handler!\n"

;        or      eax, -1

;        ret

       @@:

; reset chip

        DEBUGF  1, "Resetting chip\n"

        set_io  0

        set_io  REG_COMMAND

        mov     al , 1 shl BIT_RST

        out     dx , al

        mov     cx , 1000               ; wait no longer for the reset

  .wait_for_reset:

        in      al , dx

        test    al , 1 shl BIT_RST

        jz      .reset_completed        ; RST remains 1 during reset

        dec     cx

        jns     .wait_for_reset

  .reset_completed:

; unlock config and BMCR registers

        set_io  REG_9346CR

        mov     al, (1 shl BIT_93C46_EEM1) or (1 shl BIT_93C46_EEM0)

        out     dx, al

; initialize multicast registers (no filtering)

        mov     eax, 0xffffffff

        set_io  REG_MAR0

        out     dx, eax

        set_io  REG_MAR4

        out     dx, eax

; enable Rx/Tx

        mov     al, (1 shl BIT_RE) or (1 shl BIT_TE)

        set_io  REG_COMMAND

        out     dx, al

; Rxbuffer size, unlimited dma burst, no wrapping, no rx threshold

; accept broadcast packets, accept physical match packets

        mov     ax, RX_CONFIG

        set_io  REG_RXCONFIG

        out     dx, ax

; 1024 bytes DMA burst, total retries = 16 + 8 * 16 = 144

        mov     eax, (TX_MXDMA shl BIT_TX_MXDMA) or (TXRR shl BIT_TXRR) or BIT_IFG1 or BIT_IFG0

        set_io  REG_TXCONFIG

        out     dx, eax

; enable auto negotiation

        set_io  REG_BMCR

        in      ax, dx

        or      ax, (1 shl BIT_ANE)

        out     dx, ax

; set auto negotiation advertisement

        set_io  REG_ANAR

        in      ax, dx

        or      ax, (1 shl BIT_SELECTOR) or (1 shl BIT_10) or (1 shl BIT_10FD) or (1 shl BIT_TX) or (1 shl BIT_TXFD)

        out     dx, ax

; lock config and BMCR registers

        xor     eax, eax

        set_io  REG_9346CR

        out     dx, al

; init RX/TX pointers

        mov     [device.rx_data_offset], eax

        mov     [device.curr_tx_desc], al

;        set_io  REG_CAPR

;        out     dx, ax

; clear packet/byte counters

        lea     edi, [device.bytes_tx]

        mov     ecx, 6

        rep     stosd

; clear missing packet counter

        set_io  REG_MPC

        out     dx, eax

; set RxBuffer address, init RX buffer offset

        mov     eax, [device.rx_buffer]

        mov     dword[eax], 0

        DEBUGF  2, "RX buffer: %x\n", eax

        GetRealAddr

        DEBUGF  2, "RX buffer: %x\n", eax

        set_io  REG_RBSTART

        out     dx, eax

; Read MAC address

        call    read_mac

; enable interrupts

        set_io  0

        set_io  REG_IMR

        mov     eax, INTERRUPT_MASK

        out     dx , ax

; Set the mtu, kernel will be able to send now

        mov     [device.mtu], 1514

; Indicate that we have successfully reset the card

        DEBUGF  2, "Done!\n"

        xor     eax, eax

        ret

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

;;                                         ;;

;; Transmit                                ;;

;;                                         ;;

;; In: buffer pointer in [esp+4]           ;;

;;     size of buffer in [esp+8]           ;;

;;     pointer to device structure in ebx  ;;

;;                                         ;;

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

align 4

transmit:

        DEBUGF  1, "\nTransmitting 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      .fail

        cmp     dword [esp+8], 60

        jb      .fail

; check if we own the current discriptor

        set_io  0

        set_io  REG_TSD0

        movzx   ecx, [device.curr_tx_desc]

        shl     ecx, 2

        add     edx, ecx

        in      eax, dx

        test    eax, (1 shl BIT_OWN)

        jz      .wait_to_send

  .send_packet:

; get next descriptor

        inc     [device.curr_tx_desc]

        and     [device.curr_tx_desc], NUM_TX_DESC-1

; Update stats

        inc     [device.packets_tx]

        mov     eax, [esp+8]

        add     dword [device.bytes_tx], eax

        adc     dword [device.bytes_tx+4], 0

; Set the buffer address

        set_io  REG_TSAD0

        mov     eax, [esp+4]

        mov     [device.TX_DESC+ecx], eax

        GetRealAddr

        out     dx, eax

; And the size of the buffer

        set_io  REG_TSD0

        mov     eax, [esp+8]

        or      eax, (ERTXTH shl BIT_ERTXTH)    ; Early threshold

        out     dx, eax

        DEBUGF  1, "Packet Sent!\n"

        xor     eax, eax

        ret     8

  .wait_to_send:

        DEBUGF  1, "Waiting for timeout\n"

        push    edx

        mov     esi, 30

        stdcall Sleep

        pop     edx

        in      ax, dx

        test    ax, (1 shl BIT_OWN)

        jnz     .send_packet

        pusha

        call    reset                            ; if chip hung, reset it

        popa

        jmp     .send_packet

  .fail:

        DEBUGF  1, "failed!\n"

        stdcall KernelFree, [esp+4]

        or      eax, -1

        ret     8

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

;;                   ;;

;; Interrupt handler ;;

;;                   ;;

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

align 4

int_handler:

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

; find pointer of device wich made IRQ occur

        mov     ecx, [devices]

        test    ecx, ecx

        jz      .nothing

        mov     esi, device_list

  .nextdevice:

        mov     ebx, [esi]

        set_io  0

        set_io  REG_ISR

        in      ax, dx

        out     dx, ax                              ; send it back to ACK

        test    ax, ax

        jnz     .got_it

  .continue:

        add     esi, 4

        dec     ecx

        jnz     .nextdevice

  .nothing:

        ret                                         ; If no device was found, abort (The irq was probably for a device, not registered to this driver)

  .got_it:

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

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

; Received packet ok?

        test    ax, ISR_ROK

        jz      @f

        push    ax

  .receive:

        set_io  0

        set_io  REG_COMMAND

        in      al , dx

        test    al , BUFE                           ; test if RX buffer is empty

        jnz     .finish                             ;

        DEBUGF  1, "RX: "

        mov     eax, [device.rx_buffer]

        add     eax, [device.rx_data_offset]

        test    byte [eax], (1 shl BIT_ROK)         ; check if packet is ok

        jz      .reset_rx

; packet is ok, copy it

        movzx   ecx, word [eax+2]                   ; packet length

        sub     ecx, 4                              ; don't copy CRC

; Update stats

        add     dword [device.bytes_rx], ecx

        adc     dword [device.bytes_rx + 4], 0

        inc     dword [device.packets_rx]

        DEBUGF  1, "Received %u bytes\n", ecx

        push    ebx eax ecx

        stdcall KernelAlloc, ecx                    ; Allocate a buffer to put packet into

        pop     ecx

        test    eax, eax                            ; Test if we allocated succesfully

        jz      .abort

        mov     edi, eax                            ; Where we will copy too

        mov     esi, [esp]                          ; The buffer we will copy from

        add     esi, 4                              ; Dont copy CRC

        push    dword .abort                        ; Kernel will return to this address after EthReceiver

        push    ecx edi                             ; Save buffer pointer and size, to pass to kernel

  .copy:

        shr     ecx, 1

        jnc     .nb

        movsb

  .nb:

        shr     ecx, 1

        jnc     .nw

        movsw

  .nw:

        jz      .nd

        rep     movsd

  .nd:

        jmp     Eth_input                           ; Send it to kernel

  .abort:

        pop     eax ebx

                                                    ; update eth_data_start_offset

        movzx   eax, word [eax+2]                   ; packet length

        add     eax, [device.rx_data_offset]

        add     eax, 4+3                            ; packet header is 4 bytes long + dword alignment

        and     eax, not 3                          ; dword alignment

        cmp     eax, RX_BUFFER_SIZE

        jb      .no_wrap

        DEBUGF  2, "Wrapping"

        sub     eax, RX_BUFFER_SIZE

  .no_wrap:

        mov     [device.rx_data_offset], eax

        DEBUGF  1, "New RX ptr: %d\n", eax

        set_io  0

        set_io  REG_CAPR                            ; update 'Current Address of Packet Read register'

        sub     eax, 0x10                           ; value 0x10 is a constant for CAPR

        out     dx , ax

        jmp     .receive                            ; check for multiple packets

  .reset_rx:

        test    byte [eax], (1 shl BIT_CRC)

        jz      .no_crc_error

        DEBUGF  2, "\nCRC error!\n"

  .no_crc_error:

        test    byte [eax], (1 shl BIT_FAE)

        jz      .no_fae_error

        DEBUGF  1, "\nFrame alignment error!\n"

  .no_fae_error:

        DEBUGF  1, "Reset RX\n"

        in      al, dx                              ; read command register

        push    ax

        and     al, not (1 shl BIT_RE)              ; Clear the RE bit

        out     dx, al

        pop     ax

        out     dx, al                              ; write original command back

        add     edx, REG_RXCONFIG - REG_COMMAND     ; Restore RX configuration

        mov     ax, RX_CONFIG

        out     dx, ax

  .finish:

        pop     ax

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

; Transmit ok / Transmit error

  @@:

        test    ax, ISR_TOK + ISR_TER

        jz      @f

        push    ax

        mov     ecx, (NUM_TX_DESC-1)*4

  .txdescloop:

        set_io  0

        set_io  REG_TSD0

        add     edx, ecx

        in      eax, dx

        test    eax, TSR_OWN                    ; DMA operation completed

        jz      .notthisone

        cmp     [device.TX_DESC+ecx], 0

        je      .notthisone

;  .notxd:

;        test    eax, TSR_TUN

;        jz      .nobun

;        DEBUGF  2, "TX: FIFO Buffer underrun!\n"

;

;  .nobun:

;        test    eax, TSR_OWC

;        jz      .noowc

;        DEBUGF  2, "TX: OWC!\n"

;

;  .noowc:

;        test    eax, TSR_TABT

;        jz      .notabt

;        DEBUGF  2, "TX: TABT!\n"

;

;  .notabt:

;        test    eax, TSR_CRS

;        jz      .nocsl

;        DEBUGF  2, "TX: Carrier Sense Lost!\n"

;

;  .nocsl:

        DEBUGF  1, "TX OK: free buffer %x\n", [device.TX_DESC+ecx]:8

        push    ecx ebx

        stdcall KernelFree, [device.TX_DESC+ecx]

        pop     ebx ecx

        mov     [device.TX_DESC+ecx], 0

  .notthisone:

        sub     ecx, 4

        ja      .txdescloop

        pop     ax

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

; Rx buffer overflow ?

  @@:

        test    ax, ISR_RXOVW

        jz      @f

        push    ax

        DEBUGF  2, "RX-buffer overflow!\n"

        set_io  0

        set_io  REG_ISR

        mov     ax, ISR_FIFOOVW or ISR_RXOVW

        out     dx, ax

        pop     ax

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

; Packet underrun?

  @@:

        test    ax, ISR_PUN

        jz      @f

        DEBUGF  2, "Packet underrun!\n"

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

; Receive FIFO overflow ?

  @@:

        test    ax, ISR_FIFOOVW

        jz      @f

        push    ax

        DEBUGF  2, "RX fifo overflow!\n"

        set_io  0

        set_io  REG_ISR

        mov     ax, ISR_FIFOOVW or ISR_RXOVW

        out     dx, ax

        pop     ax

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

; Something about Cable changed ?

  @@:

        test    ax, ISR_LENCHG

        jz      .fail

        DEBUGF  2, "Cable changed!\n"

        call    cable

  .fail:

        DEBUGF  2, "\n"

        ret

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

;;                     ;;

;; Update Cable status ;;

;;                     ;;

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

align 4

cable:

        DEBUGF  1, "Checking Cable status: "

        mov     edx, dword [device.io_addr]

        add     edx, REG_MSR

        in      al , dx

;        test    al , 1 SHL 2     ; 0 = link ok 1 = link fail

;        jnz     .notconnected

;        test    al , 1 SHL 3     ; 0 = 100 Mbps 1 = 10 Mbps

;        jnz     .10mbps

        shr     al, 2

        and     al, 3

        mov     byte [device.mode+3], al

        DEBUGF  1, "Done!\n"

ret

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

;;                   ;;

;; Write MAC address ;;

;;                   ;;

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

align 4

write_mac:      ; in: mac pushed onto stack (as 3 words)

        DEBUGF  2, "Writing MAC: "

; disable all in command registers

        set_io  0

        set_io  REG_9346CR

        xor     eax, eax

        out     dx, al

        set_io  REG_IMR

        xor     eax, eax

        out     dx, ax

        set_io  REG_ISR

        mov     eax, -1

        out     dx, ax

; enable writing

        set_io  REG_9346CR

        mov     eax, REG_9346CR_WE

        out     dx, al