ret
   
   
   
;***************************************************************************
;   Function
;      rtl8029_probe
;   Description
;      Searches for an ethernet card, enables it and clears the rx buffer
;      If a card was found, it enables the ethernet -> TCPIP link
;
;***************************************************************************
rtl8029_probe:
   mov      eax, [io_addr]
   mov      [eth_nic_base], ax      ; The IO address space is 16 bit only
   
   mov      al, VENDOR_NONE
   mov      [eth_vendor], al
   
   mov      al, [eth_vendor]
   cmp      al, VENDOR_NONE
   
   jne      ep_check_have_vendor
   xor      eax, eax
   mov      [eth_bmem], eax
   
   mov      al, FLAG_PIO
   mov      [eth_flags], al
   
   mov      ax, [eth_nic_base]
   add      ax, NE_ASIC_OFFSET
   mov      [eth_asic_base], ax
   
   mov      al, MEM_16384
   mov      [eth_memsize], al
   
   mov      al, 32
   mov      [eth_tx_start], al
   
   add      al, D8390_TXBUF_SIZE
   mov      [eth_rx_start], al
   
   mov      dx, [eth_asic_base]
   add      dx, NE_RESET
   
   in      al, dx
   out      dx, al
   
   in      al, 0x84
   
   mov      bx, [eth_nic_base]
   
   mov      dx, bx
   add      dx, D8390_P0_COMMAND
   mov      al, D8390_COMMAND_RD2_STP
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P0_RCR
   mov      al, D8390_RCR_MON
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P0_DCR
   mov      al, D8390_DCR_FT1_LS
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P0_PSTART
   mov      al, MEM_8192
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P0_PSTOP
   mov      al, MEM_16384
   out      dx, al
   
   mov      esi, test_data
   mov      ebx, 8192
   mov      ecx, 14
   call   eth_pio_write
   
   mov      ebx, 8192
   mov      ecx, 14
   mov      edi, test_buffer
   call   eth_pio_read
   
   mov      esi, test_buffer
   mov      edi, test_data
    mov       ecx, 13
    cld
    rep       cmpsb
   
    je      ep_set_vendor
   
    mov      al, [eth_flags]
    or      al, FLAG_16BIT
    mov      [eth_flags], al
   
    mov      al, MEM_32768
    mov      [eth_memsize], al
   
    mov      al, 64
    mov      [eth_tx_start], al
   
   add      al, D8390_TXBUF_SIZE
   mov      [eth_rx_start], al
   
   mov      bx, [eth_nic_base]
   
   mov      dx, bx
   add      dx, D8390_P0_DCR
   mov      al, D8390_DCR_WTS_FT1_LS
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P0_PSTART
   mov      al, MEM_16384
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P0_PSTOP
   mov      al, MEM_32768
   out      dx, al
   
   mov      esi, test_data
   mov      ebx, 16384
   mov      ecx, 14
   call   eth_pio_write
   
   mov      ebx, 16384
   mov      ecx, 14
   mov      edi, test_buffer
   call     eth_pio_read
   
   mov      esi, test_buffer
   mov      edi, test_data
   mov      ecx, 13
   cld
   rep      cmpsb
   
ep_set_vendor:
   ; this bit is odd - probably left over from my hacking
   mov      ax, [eth_nic_base]
   cmp      ax, 0
   je       rtl8029_exit
   cmp      ax, ISA_MAX_ADDR
   jbe      ep_001
   mov      al, [eth_flags]
   or       al, FLAG_16BIT
   mov      [eth_flags], al
   
ep_001:
   mov      al, VENDOR_NOVELL
   mov      [eth_vendor], al
   
   mov      ebx, 0
   mov      ecx, 16
   mov      edi, romdata
   call     eth_pio_read
   
   
   mov      ecx, ETH_ALEN
   mov      esi, romdata
   mov      edi, node_addr
   
   mov      bl, [eth_flags]
   and      bl, FLAG_16BIT
   
ep_002:
   mov      al, [esi]
   mov      [edi], al
   
   inc      edi
   inc      esi
   cmp      bl, FLAG_16BIT
   jne      ep_003
   
   inc      esi
   
ep_003:
   loop     ep_002
   
ep_check_have_vendor:
   mov      al, [eth_vendor]
   cmp      al, VENDOR_NONE
   je       rtl8029_exit
   
   cmp      al, VENDOR_3COM
   je       ep_reset_card
   
   mov      eax, [eth_bmem]
   mov      [eth_rmem], eax
   
ep_reset_card:
   ; Reset the card
   call     rtl8029_reset
   
   ; Indicate that we have successfully reset the card
   mov      eax, [pci_data]
   mov      [eth_status], eax
   
rtl8029_exit:
   ret
   
   
   
;***************************************************************************
; Function
;    rtl8029_poll
;
; Description
;    Polls the ethernet card for a received packet
;    Received data, if any, ends up in Ether_buffer
;
;***************************************************************************
rtl8029_poll:
   mov      eax, Ether_buffer
   mov      [eth_rx_data_ptr], eax

   mov      bx, [eth_nic_base]
   
   mov      dx, bx
   add      dx, D8390_P0_RSR
   in       al, dx
   
   and      al, D8390_RSTAT_PRX
   cmp      al, D8390_RSTAT_PRX
   jne      nsp_exit
   
   mov      dx, bx
   add      dx, D8390_P0_BOUND
   in       al, dx
   inc      al
   
   cmp      al, [eth_memsize]
   jb       nsp_001
   
   mov      al, [eth_rx_start]
   
nsp_001:
   mov      ch, al
   
   mov      dx, bx
   add      dx, D8390_P0_COMMAND
   mov      al, D8390_COMMAND_PS1
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P1_CURR
   in       al, dx               ; get current page
   mov      cl, al
   
   mov      dx, bx
   add      dx, D8390_P0_COMMAND
   mov      al, D8390_COMMAND_PS0
   out      dx, al
   
   cmp      cl, [eth_memsize]
   jb       nsp_002
   
   mov      cl, [eth_rx_start]
   
nsp_002:
   cmp      cl, ch
   je       nsp_exit
   
   xor      ax, ax
   mov      ah, ch
   
   mov      [pktoff], ax
   
   mov      al, [eth_flags]
   and      al, FLAG_PIO
   cmp      al, FLAG_PIO
   jne      nsp_003
   
   movzx    ebx, word [pktoff]
   mov      edi, pkthdr
   mov      ecx, 4
   call     eth_pio_read
   jmp      nsp_004
   
nsp_003:
   mov      edi, [eth_rmem]
   movzx    eax, word [pktoff]
   add      edi, eax
   mov      eax, [edi]
   mov      [pkthdr], eax
   
nsp_004:
   mov      ax, [pktoff]
   add      ax, 4
   mov      [pktoff], ax
   
   mov      ax, [pkthdr + 2]
   sub      ax, 4
   
   mov      [eth_tmp_len], ax
   
   cmp      ax, ETH_ZLEN
   jb       nsp_exit
   
   cmp      ax, ETH_FRAME_LEN
   ja       nsp_exit
   
   mov      al, [pkthdr]
   and      al, D8390_RSTAT_PRX
   cmp      al, D8390_RSTAT_PRX
   jne      nsp_exit
   
   ; Right, we can now get the data
   
   mov      ax, [eth_tmp_len]
   mov      [eth_rx_data_len], ax
   
   xor      ebx, ebx
   mov      bh, [eth_memsize]
   sub      bx, [pktoff]
   
   cmp      [eth_tmp_len], bx
   jbe      nsp_005
   
   mov      al, [eth_flags]
   and      al, FLAG_PIO
   cmp      al, FLAG_PIO
   jne      nsp_006
   
   push     ebx
   mov      ecx, ebx
   xor      ebx, ebx
   mov      bx, [pktoff]
   mov      edi, [eth_rx_data_ptr]
   call     eth_pio_read
   pop      ebx
   jmp      nsp_007
   
nsp_006:
   ; Not implemented, as we are using PIO mode on this card
   
nsp_007:
   xor      ax, ax
   mov      ah, [eth_rx_start]
   mov      [pktoff], ax
   
   mov      eax, [eth_rx_data_ptr]
   add      eax, ebx
   mov      [eth_rx_data_ptr], eax
   
   mov      ax, [eth_tmp_len]
   sub      ax, bx
   mov      [eth_tmp_len], ax
   
nsp_005:
   mov      al, [eth_flags]
   and      al, FLAG_PIO
   cmp      al, FLAG_PIO
   jne      nsp_008
   
   xor      ebx, ebx
   mov      bx, [pktoff]
   xor      ecx, ecx
   mov      cx, [eth_tmp_len]
   mov      edi, [eth_rx_data_ptr]
   call     eth_pio_read
   jmp      nsp_009
   
nsp_008:
   ; Not implemented, as we are using PIO mode on this card
   
nsp_009:
   mov      al, [pkthdr+1]
   cmp      al, [eth_rx_start]
   jne      nsp_010
   
   mov      al, [eth_memsize]
   
nsp_010:
   mov      dx, [eth_nic_base]
   add      dx, D8390_P0_BOUND
   dec      al
   out      dx, al
   
nsp_exit:
   ret
   
   
   
;***************************************************************************
;   Function
;      rtl8029_transmit
;
;   Description
;       Transmits a packet of data via the ethernet card
;          Pointer to 48 bit destination address in edi
;         Type of packet in bx
;         size of packet in ecx
;         pointer to packet data in esi
;
;***************************************************************************
rtl8029_transmit:
   mov      [eth_type], bx
   
   pusha
   
   mov      esi, edi
   xor      bx, bx
   mov      bh, [eth_tx_start]
   mov      ecx, ETH_ALEN
   call     eth_pio_write
   
   mov      esi, node_addr
   xor      bx, bx
   mov      bh, [eth_tx_start]
   add      bx, ETH_ALEN
   mov      ecx, ETH_ALEN
   call     eth_pio_write
   
   mov      esi, eth_type
   xor      bx, bx
   mov      bh, [eth_tx_start]
   add      bx, ETH_ALEN
   add      bx, ETH_ALEN
   mov      ecx, 2
   call     eth_pio_write
   
   popa
   
   xor      bx, bx
   mov      bh, [eth_tx_start]
   add      bx, ETH_HLEN
   push     ecx
   call     eth_pio_write
   pop      ecx
   
   add      ecx, ETH_HLEN
   cmp      ecx, ETH_ZLEN
   jae      nst_001
   
   mov      ecx, ETH_ZLEN
   
nst_001:
   push     ecx
   
   mov      bx, [eth_nic_base]
   
   mov      dx, bx
   add      dx, D8390_P0_COMMAND
   mov      al, D8390_COMMAND_PS0_RD2_STA
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P0_TPSR
   mov      al, [eth_tx_start]
   out      dx, al
   
   pop      ecx
   
   mov      dx, bx
   add      dx, D8390_P0_TBCR0
   mov      al, cl
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P0_TBCR1
   mov      al, ch
   out      dx, al
   
   mov      dx, bx
   add      dx, D8390_P0_COMMAND
   mov      al, D8390_COMMAND_PS0_TXP_RD2_STA
   out      dx, al
   
   ret