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

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

;

;

; ARP_add_entry (or update)

; ARP_add_entry (or update)

;

;

; IN:  esi = ptr to entry (can easily be made on the stack)

; IN:  esi = ptr to entry (can easily be made on the stack)

; OUT: eax = entry #, -1 on error

; OUT: eax = entry #, -1 on error

;      esi = ptr to newly created entry

;      esi = ptr to newly created entry

;

;

;-----------------------------------------------------------------      ; TODO: use a mutex

;-----------------------------------------------------------------      ; TODO: use a mutex

align 4

align 4

ARP_add_entry:

ARP_add_entry:

        mov     ecx, [ARP_entries_num + 4*edi]

        mov     ecx, [ARP_entries_num + edi]

        cmp     ecx, ARP_TABLE_SIZE                                     ; list full ?

        cmp     ecx, ARP_TABLE_SIZE                                     ; list full ?

; From this point on, we can only fail if IP has a static entry, or if table is corrupt.

; From this point on, we can only fail if IP has a static entry, or if table is corrupt.

        inc     [ARP_entries_num + 4*edi]                               ; assume we will succeed

        inc     [ARP_entries_num + edi]                                 ; assume we will succeed

        push    edi

        push    edi

        xor     ecx, ecx

        xor     ecx, ecx

        imul    edi, ARP_TABLE_SIZE*sizeof.ARP_entry

        imul    edi, ARP_TABLE_SIZE*sizeof.ARP_entry/4

        ret

        ret

        pop     edi

        pop     edi

        dec     [ARP_entries_num + 4*edi]

        dec     [ARP_entries_num + edi]

        DEBUGF  DEBUG_NETWORK_ERROR, "ARP_add_entry_failed\n"

        DEBUGF  DEBUG_NETWORK_ERROR, "ARP_add_entry_failed\n"

  .full:

  .full:

; ARP_IP_to_MAC

; ARP_IP_to_MAC

;

;

;  This function translates an IP address to a MAC address

;  This function translates an IP address to a MAC address

;

;

;  IN:  eax = IPv4 address

;  IN:  eax = IPv4 address

;  OUT: eax = -1 on error, -2 means request send

;  OUT: eax = -1 on error, -2 means request send

;      else, ax = first two bytes of mac (high 16 bits of eax will be 0)

;      else, ax = first two bytes of mac (high 16 bits of eax will be 0)

;       ebx = last four bytes of mac

;       ebx = last four bytes of mac

;       edi = unchanged

;       edi = unchanged

;

;

align 4

align 4

ARP_IP_to_MAC:

ARP_IP_to_MAC:

        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_IP_to_MAC: %u.%u", al, ah

        DEBUGF  DEBUG_NETWORK_VERBOSE, "ARP_IP_to_MAC: %u.%u", al, ah

        DEBUGF  DEBUG_NETWORK_VERBOSE, ".%u.%u device: %u\n", al, ah, edi

        DEBUGF  DEBUG_NETWORK_VERBOSE, ".%u.%u device*4: %u\n", al, ah, edi

        rol     eax, 16

        rol     eax, 16

        cmp     eax, 0xffffffff

        cmp     eax, 0xffffffff

        je      .broadcast

        je      .broadcast

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

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

; Try to find the IP in ARP_table

; Try to find the IP in ARP_table

        mov     ecx, [ARP_entries_num + 4*edi]

        mov     ecx, [ARP_entries_num]

        test    ecx, ecx

        test    ecx, ecx

; Now send a request packet on the network

; Now send a request packet on the network

        pop     edi eax                 ; IP in eax, device number in ebx, for ARP_output_request

        pop     edi eax                 ; IP in eax, device number in ebx, for ARP_output_request

        push    esi edi

        push    esi edi

        mov     ebx, [NET_DRV_LIST + 4*edi]

        mov     ebx, [NET_DRV_LIST + edi]

        call    ARP_output_request

        call    ARP_output_request

        pop     edi esi

        pop     edi esi

  .found_it:

  .found_it:

        ret

        ret

  .write:

  .write:

        ; esi = pointer to buffer

        ; esi = pointer to buffer

        shr     edi, 2

        mov     edi, eax

        call    ARP_add_entry           ; out: eax = entry number, -1 on error

        call    ARP_add_entry           ; out: eax = entry number, -1 on error

        ret

        ret