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3555 Serge 1 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;                                                                 ;;
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;; Copyright (C) KolibriOS team 2004-2010. All rights reserved.    ;;
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;; Distributed under terms of the GNU General Public License       ;;
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;;                                                                 ;;
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;;  loopback.inc                                                   ;;
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;;                                                                 ;;
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;;  LoopBack device for KolibriOS                                  ;;
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;;                                                                 ;;
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;;    Written by hidnplayr@kolibrios.org                           ;;
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;;                                                                 ;;
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;;          GNU GENERAL PUBLIC LICENSE                             ;;
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;;             Version 2, June 1991                                ;;
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;;                                                                 ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 2891 $
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iglobal
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LOOPBACK_DEVICE:
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        .type            dd NET_TYPE_LOOPBACK
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        .mtu             dd 4096
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        .name            dd .namestr
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        .unload          dd .dummy_fn
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        .reset           dd .dummy_fn
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        .transmit        dd LOOP_input
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        .bytes_tx        dq 0
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        .bytes_rx        dq 0
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        .packets_tx      dd 0
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        .packets_rx      dd 0
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        .namestr         db 'loopback', 0
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        .dummy_fn:
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                ret
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endg
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;-----------------------------------------------------------------
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;
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; LOOP_input
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;
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;  IN:   [esp+4]  = Pointer to buffer
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;       [esp+8] = size of buffer
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;
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;  OUT: /
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;
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;-----------------------------------------------------------------
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align 4
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LOOP_input:
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        pop     ebx
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        pop     eax
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        pop     ecx
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        push    ebx
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        push    ecx
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        push    eax
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3589 Serge 62 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_input: size=%u\n", ecx
3555 Serge 63 
        lea     edx, [eax + 2]
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        mov     ax, word[eax]
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        mov     ebx, LOOPBACK_DEVICE
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        cmp     ax, ETHER_IPv4
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        je      IPv4_input
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3589 Serge 70 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_input: Unknown packet type=%x\n", ax
3555 Serge 71 
 
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  .dump:
3589 Serge 73 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_input: dumping\n"
3555 Serge 74 
        call    kernel_free
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        add     esp, 4
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        ret
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;-----------------------------------------------------------------
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;
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; LOOP_output
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;
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; IN:
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;     ecx = packet size
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;      di = protocol
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;
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; OUT: edi = 0 on error, pointer to buffer otherwise
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;      eax = buffer start
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;      ebx = to device structure
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;      ecx = unchanged (packet size of embedded data)
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;      edx = size of complete buffer
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;
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;-----------------------------------------------------------------
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align 4
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LOOP_output:
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3589 Serge 96 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_output\n"
3555 Serge 97 
 
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        push    ecx
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        push    di
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        add     ecx, 2
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        cmp     ecx, [LOOPBACK_DEVICE.mtu]
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        ja      .out_of_ram
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        stdcall kernel_alloc, ecx
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        test    eax, eax
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        jz      .out_of_ram
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        mov     edi, eax
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        pop     ax
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        stosw
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        lea     eax, [edi - 2]  ; Set eax to buffer start
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        pop     ecx
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        lea     edx, [ecx + 2]  ; Set edx to complete buffer size
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        mov     ebx, LOOPBACK_DEVICE
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  .done:
3589 Serge 117 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_output: ptr=%x size=%u\n", eax, edx
3555 Serge 118 
        ret
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  .out_of_ram:
3589 Serge 121 
        DEBUGF  DEBUG_NETWORK_VERBOSE, "LOOP_output: failed\n"
3555 Serge 122 
        add     esp, 2+4
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        sub     edi, edi
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        ret
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