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Rev | Author | Line No. | Line |
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1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; ETHERNET.INC ;; |
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4 | ;; ;; |
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5 | ;; Ethernet network layer for Menuet OS ;; |
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6 | ;; ;; |
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7 | ;; Version 0.4 22 September 2003 ;; |
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8 | ;; ;; |
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9 | ;; This file contains the following: ;; |
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10 | ;; PCI bus scanning for valid devices ;; |
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11 | ;; Table of supported ethernet drivers ;; |
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12 | ;; Code to identify and activate a supported driver ;; |
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13 | ;; ARP handler ;; |
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14 | ;; Driver interface to the IP layer ;; |
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15 | ;; Gateway support ;; |
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16 | ;; ;; |
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17 | ;; Individual driver files are included here ;; |
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18 | ;; ;; |
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19 | ;; The PCI bus scanning code was ported from the etherboot ;; |
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20 | ;; 5.0.6 project. The copyright statement for that code is ;; |
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21 | ;; ;; |
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22 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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23 | ;; Version 2, June 1991 ;; |
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24 | ;; ;; |
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25 | ;; remaining parts Copyright 2002 Mike Hibbett ;; |
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26 | ;; mikeh@oceanfree.net ;; |
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27 | ;; ;; |
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28 | ;; See file COPYING for details ;; |
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29 | ;; ;; |
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30 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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31 | |||
32 | ;******************************************************************** |
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33 | ; Interface |
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34 | ; ethernet_driver called by stack_handler in stack.inc |
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35 | ; eth_probe called by app_stack_handler in stack.inc |
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36 | ; |
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37 | ;******************************************************************** |
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38 | |||
302 | hidnplayr | 39 | ETHER_IP equ 0x0008 ; Reversed from 0800 for intel |
40 | ETHER_ARP equ 0x0608 ; Reversed from 0806 for intel |
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41 | ETHER_RARP equ 0x3580 |
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261 | hidnplayr | 42 | |
43 | struc ETH_FRAME |
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302 | hidnplayr | 44 | { .DstMAC dp ? ;destination MAC-address [6 bytes] |
45 | .SrcMAC dp ? ;source MAC-address [6 bytes] |
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46 | .Type dw ? ;type of the upper-layer protocol [2 bytes] |
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47 | .Data db ? ;data [46-1500 bytes] |
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261 | hidnplayr | 48 | } |
49 | |||
50 | virtual at Ether_buffer |
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51 | ETH_FRAME ETH_FRAME |
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52 | end virtual |
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53 | |||
54 | |||
1 | ha | 55 | ; Some useful information on data structures |
56 | |||
57 | ; Ethernet Packet - ARP Request example |
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58 | ; |
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59 | ; 0 1 2 3 |
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60 | ; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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61 | ; |
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62 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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63 | ; | Dest H/W Address | |
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64 | ; | ( 14 byte header ) | |
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65 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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66 | ; | | Source H/W Address | |
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67 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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68 | ; | | |
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69 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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70 | ; | Protocol - ARP 08 06 | |
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71 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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72 | |||
73 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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74 | ; | H/W Type 00 01 | Protocol Type 08 00 | |
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75 | ; | ( ARP Request packet ) | |
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76 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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77 | ; | HLen 0x06 | PLen 0x04 | OpCode 00 01 | |
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78 | ; | ( 0001 for request, 0002 for reply ) | |
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79 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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80 | ; | Source Hardware Address ( MAC Address ) | |
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81 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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82 | ; | | Source IP Address | |
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83 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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84 | ; | | Destination Hardware Address | |
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85 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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86 | ; | | |
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87 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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88 | ; | Destination IP Address | |
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89 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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90 | |||
91 | ; Include individual drivers source files at this point. |
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92 | ; If you create a new driver, include it below. |
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93 | |||
261 | hidnplayr | 94 | include "drivers/rtl8029.inc" |
95 | include "drivers/i8255x.inc" |
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96 | include "drivers/rtl8139.inc" |
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97 | include "drivers/3c59x.inc" |
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98 | include "drivers/sis900.inc" |
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99 | include "drivers/pcnet32.inc" |
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1 | ha | 100 | |
101 | ; PCICards |
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102 | ; ======== |
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103 | ; PCI vendor and hardware types for hardware supported by the above drivers |
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104 | ; If you add a driver, ensure you update this datastructure, otherwise the |
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105 | ; card will not be probed. |
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106 | ; Each driver is defined by 4 double words. These are |
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107 | ; PCIVendorDevice probeFunction ResetFunction PollFunction transmitFunction |
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108 | ; The last entry must be kept at all zeros, to indicate the end of the list |
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109 | ; As a PCI driver may support more than one hardware implementation, there may |
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110 | ; be several lines which refer to the same functions. |
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111 | ; The first driver found on the PCI bus will be the one used. |
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112 | |||
302 | hidnplayr | 113 | PCICARDS_ENTRY_SIZE equ 24 ; Size of each PCICARDS entry |
1 | ha | 114 | |
115 | iglobal |
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116 | PCICards: |
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302 | hidnplayr | 117 | dd 0x12098086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0 |
118 | dd 0x10298086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0 |
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119 | dd 0x12298086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0 |
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120 | dd 0x10308086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0 |
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121 | dd 0x24498086, I8255x_probe, I8255x_reset, I8255x_poll, I8255x_transmit, 0 |
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122 | dd 0x802910ec, rtl8029_probe, rtl8029_reset, rtl8029_poll, rtl8029_transmit, 0 |
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123 | dd 0x12111113, rtl8029_probe, rtl8029_reset, rtl8029_poll, rtl8029_transmit, 0 |
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124 | |||
125 | dd 0x813910ec, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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126 | dd 0x813810ec, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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127 | dd 0x12111113, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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128 | dd 0x13601500, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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129 | dd 0x13604033, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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130 | dd 0x13001186, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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131 | dd 0x13401186, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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132 | dd 0xab0613d1, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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133 | dd 0xa1171259, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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134 | dd 0xa11e1259, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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135 | dd 0xab0614ea, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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136 | dd 0xab0714ea, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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137 | dd 0x123411db, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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138 | dd 0x91301432, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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139 | dd 0x101202ac, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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140 | dd 0x0106018a, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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141 | dd 0x1211126c, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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142 | dd 0x81391743, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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143 | dd 0x8139021b, rtl8139_probe, rtl8139_reset, rtl8139_poll, rtl8139_transmit, rtl8139_cable |
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144 | |||
145 | dd 0x590010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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146 | dd 0x592010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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147 | dd 0x597010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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148 | dd 0x595010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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149 | dd 0x595110b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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150 | dd 0x595210b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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151 | dd 0x900010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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152 | dd 0x900110b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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153 | dd 0x900410b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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154 | dd 0x900510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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155 | dd 0x900610b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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156 | dd 0x900A10b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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157 | dd 0x905010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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158 | dd 0x905110b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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159 | dd 0x905510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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160 | dd 0x905810b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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161 | dd 0x905A10b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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162 | dd 0x920010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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163 | dd 0x980010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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164 | dd 0x980510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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165 | dd 0x764610b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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166 | dd 0x505510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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167 | dd 0x605510b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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168 | dd 0x605610b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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169 | dd 0x5b5710b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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170 | dd 0x505710b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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171 | dd 0x515710b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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172 | dd 0x525710b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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173 | dd 0x656010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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174 | dd 0x656210b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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175 | dd 0x656410b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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176 | dd 0x450010b7, e3c59x_probe, e3c59x_reset, e3c59x_poll, e3c59x_transmit, 0 |
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177 | |||
178 | dd 0x09001039, SIS900_probe, SIS900_reset, SIS900_poll, SIS900_transmit, 0 |
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179 | |||
180 | dd 0x20001022, pcnet32_probe, pcnet32_reset, pcnet32_poll, pcnet32_xmit, 0 |
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181 | dd 0x26251022, pcnet32_probe, pcnet32_reset, pcnet32_poll, pcnet32_xmit, 0 |
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182 | dd 0x20011022, pcnet32_probe, pcnet32_reset, pcnet32_poll, pcnet32_xmit, 0 |
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1 | ha | 183 | ; following card is untested |
302 | hidnplayr | 184 | dd 0x70161039, SIS900_probe, SIS900_reset, SIS900_poll, SIS900_transmit, 0 |
185 | rb PCICARDS_ENTRY_SIZE ; end of list marker, do not remove |
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1 | ha | 186 | endg |
187 | |||
188 | uglobal |
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261 | hidnplayr | 189 | ;Net-stack's interface's settings |
302 | hidnplayr | 190 | node_addr: db 0,0,0,0,0,0 |
191 | gateway_ip: dd 0 |
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192 | dns_ip: dd 0 |
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261 | hidnplayr | 193 | |
1 | ha | 194 | eth_rx_data_len: dw 0 |
302 | hidnplayr | 195 | eth_status: dd 0 |
196 | io_addr: dd 0 |
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197 | hdrtype: db 0 |
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1 | ha | 198 | vendor_device: dd 0 |
302 | hidnplayr | 199 | pci_data: dd 0 |
200 | pci_dev: dd 0 |
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201 | pci_bus: dd 0 |
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1 | ha | 202 | |
203 | ; These will hold pointers to the selected driver functions |
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302 | hidnplayr | 204 | drvr_probe: dd 0 |
205 | drvr_reset: dd 0 |
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206 | drvr_poll: dd 0 |
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1 | ha | 207 | drvr_transmit: dd 0 |
302 | hidnplayr | 208 | drvr_cable: dd 0 |
1 | ha | 209 | |
210 | endg |
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211 | |||
212 | iglobal |
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213 | broadcast_add: db 0xff,0xff,0xff,0xff,0xff,0xff |
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302 | hidnplayr | 214 | subnet_mask: dd 0x00ffffff ; 255.255.255.0 |
1 | ha | 215 | endg |
216 | |||
261 | hidnplayr | 217 | include "arp.inc" ;arp-protocol functions |
218 | include "pci.inc" ;PCI bus access functions |
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1 | ha | 219 | |
220 | |||
221 | ;*************************************************************************** |
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222 | ; Function |
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223 | ; eth_tx |
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224 | ; |
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225 | ; Description |
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226 | ; Looks at the NET1OUT_QUEUE for data to send. |
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227 | ; Stores that destination IP in a location used by the tx routine |
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228 | ; Looks up the MAC address in the ARP table; stores that where |
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229 | ; the tx routine can get it |
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230 | ; Get the length of the data. Store that where the tx routine wants it |
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231 | ; Call tx |
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232 | ; Places buffer on empty queue when the tx routine finished |
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233 | ; |
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234 | ;*************************************************************************** |
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261 | hidnplayr | 235 | proc eth_tx stdcall uses ebx esi edi |
236 | local MACAddress dp ? ;allocate 6 bytes in the stack |
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237 | |||
1 | ha | 238 | ; Look for a buffer to tx |
239 | mov eax, NET1OUT_QUEUE |
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240 | call dequeue |
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241 | cmp ax, NO_BUFFER |
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302 | hidnplayr | 242 | je .exit ; Exit if no buffer available |
1 | ha | 243 | |
261 | hidnplayr | 244 | push eax ;save buffer number |
1 | ha | 245 | |
246 | ; convert buffer pointer eax to the absolute address |
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261 | hidnplayr | 247 | imul eax, IPBUFFSIZE |
1 | ha | 248 | add eax, IPbuffs |
249 | |||
250 | ; Extract the destination IP |
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251 | ; find the destination IP in the ARP table, get MAC |
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252 | ; store this MAC in 'MACAddress' |
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302 | hidnplayr | 253 | mov ebx, eax ; Save buffer address |
254 | mov edx, [ebx + 16] ; get destination address |
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1 | ha | 255 | |
256 | ; If the destination address is 255.255.255.255, |
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257 | ; set the MACAddress to all ones ( broadcast ) |
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261 | hidnplayr | 258 | cld |
259 | mov esi, broadcast_add |
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260 | lea edi, [MACAddress] |
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261 | movsd |
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262 | movsw |
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1 | ha | 263 | cmp edx, 0xffffffff |
302 | hidnplayr | 264 | je .send ; If it is broadcast, just send |
1 | ha | 265 | |
302 | hidnplayr | 266 | lea eax, [MACAddress] ;cause this is local variable |
261 | hidnplayr | 267 | stdcall arp_table_manager, ARP_TABLE_IP_TO_MAC, edx, eax ;opcode,IP,MAC_ptr - Get the MAC address. |
1 | ha | 268 | |
269 | cmp eax, ARP_VALID_MAPPING |
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302 | hidnplayr | 270 | je .send |
1 | ha | 271 | |
261 | hidnplayr | 272 | ; No valid entry. Has the request been sent, but timed out? |
1 | ha | 273 | cmp eax, ARP_RESPONSE_TIMEOUT |
302 | hidnplayr | 274 | je .freebuf |
1 | ha | 275 | |
302 | hidnplayr | 276 | .wait_response: ;we wait arp-response |
277 | ; Re-queue the packet, and exit |
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1 | ha | 278 | pop ebx |
279 | mov eax, NET1OUT_QUEUE |
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302 | hidnplayr | 280 | call queue ; Get the buffer back |
261 | hidnplayr | 281 | jmp .exit |
1 | ha | 282 | |
261 | hidnplayr | 283 | .send: ;if ARP_VALID_MAPPING then send the packet |
302 | hidnplayr | 284 | lea edi, [MACAddress] ; Pointer to 48 bit destination address |
285 | movzx ecx, word[ebx+2] ; Size of IP packet to send |
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286 | xchg ch, cl ; because mirror byte-order |
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287 | mov esi, ebx ; Pointer to packet data |
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288 | mov bx, ETHER_IP ; Type of packet |
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261 | hidnplayr | 289 | call dword [drvr_transmit] ; Call the drivers transmit function |
1 | ha | 290 | |
291 | ; OK, we have sent a packet, so increment the count |
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292 | inc dword [ip_tx_count] |
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293 | |||
294 | ; And finally, return the buffer to the free queue |
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261 | hidnplayr | 295 | .freebuf: |
1 | ha | 296 | pop eax |
297 | call freeBuff |
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298 | |||
261 | hidnplayr | 299 | .exit: |
1 | ha | 300 | ret |
261 | hidnplayr | 301 | endp |
1 | ha | 302 | |
303 | ;*************************************************************************** |
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304 | ; Function |
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305 | ; ether_IP_handler |
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306 | ; |
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307 | ; Description |
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308 | ; Called when an IP ethernet packet is received on the ethernet |
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309 | ; Header + Data is in Ether_buffer[] |
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310 | ; We just need to get a buffer from the 'free' queue, and |
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311 | ; store the packet in it, then insert the packet number into the |
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312 | ; IPRX queue. |
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313 | ; If no queue entry is available, the packet is silently discarded |
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314 | ; All registers may be destroyed |
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315 | ; |
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316 | ;*************************************************************************** |
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317 | ether_IP_handler: |
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318 | mov eax, EMPTY_QUEUE |
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319 | call dequeue |
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320 | cmp ax, NO_BUFFER |
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302 | hidnplayr | 321 | je eiph00x |
1 | ha | 322 | |
323 | ; convert buffer pointer eax to the absolute address |
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324 | push eax |
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325 | mov ecx, IPBUFFSIZE |
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326 | mul ecx |
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327 | add eax, IPbuffs |
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328 | |||
329 | mov edi, eax |
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330 | |||
331 | ; get a pointer to the start of the DATA |
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261 | hidnplayr | 332 | mov esi, ETH_FRAME.Data |
1 | ha | 333 | |
334 | ; Now store it all away |
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335 | mov ecx, IPBUFFSIZE / 4 ; Copy all of the available |
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302 | hidnplayr | 336 | ; data across - worse case |
1 | ha | 337 | cld |
338 | rep movsd |
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339 | |||
340 | ; And finally, place the buffer in the IPRX queue |
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341 | pop ebx |
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342 | mov eax, IPIN_QUEUE |
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343 | call queue |
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344 | |||
345 | eiph00x: |
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346 | ret |
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347 | |||
348 | ;*************************************************************************** |
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349 | ; Function |
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261 | hidnplayr | 350 | ; eth_probe |
1 | ha | 351 | ; Description |
261 | hidnplayr | 352 | ; Searches for an ethernet card. If found, the card is enabled and |
353 | ; the ethernet -> IP link established |
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1 | ha | 354 | ; |
261 | hidnplayr | 355 | ; This function scans the PCI bus looking for a supported device. |
356 | ; ISA bus is currently not supported. |
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1 | ha | 357 | ; |
261 | hidnplayr | 358 | ; eax is 0 if no hardware found |
1 | ha | 359 | ;*************************************************************************** |
261 | hidnplayr | 360 | eth_probe: |
361 | ; Find a card on the PCI bus, and get it's address |
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302 | hidnplayr | 362 | call scan_bus ; Find the ethernet cards PIC address |
1 | ha | 363 | xor eax, eax |
261 | hidnplayr | 364 | cmp [io_addr], eax |
302 | hidnplayr | 365 | je ep_00x ; Return 0 in eax if no cards found |
1 | ha | 366 | |
302 | hidnplayr | 367 | call dword [drvr_probe] ; Call the drivers probe function |
1 | ha | 368 | |
302 | hidnplayr | 369 | mov eax, [io_addr] ; return a non zero value |
1 | ha | 370 | |
261 | hidnplayr | 371 | ep_00x: |
1 | ha | 372 | ret |
373 | |||
374 | ;*************************************************************************** |
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375 | ; Function |
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261 | hidnplayr | 376 | ; ethernet_driver |
1 | ha | 377 | ; |
378 | ; Description |
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261 | hidnplayr | 379 | ; The ethernet RX and TX handler |
380 | ; This is a kernel function, called by stack_handler |
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1 | ha | 381 | ; |
382 | ;*************************************************************************** |
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261 | hidnplayr | 383 | ethernet_driver: |
384 | ; Do nothing if the driver is inactive |
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385 | cmp [ethernet_active], byte 0 |
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302 | hidnplayr | 386 | je eth_exit |
1 | ha | 387 | |
261 | hidnplayr | 388 | call eth_rx |
389 | call eth_tx |
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1 | ha | 390 | |
261 | hidnplayr | 391 | eth_exit: |
1 | ha | 392 | ret |
393 | |||
394 | ;*************************************************************************** |
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395 | ; Function |
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261 | hidnplayr | 396 | ; eth_rx |
1 | ha | 397 | ; |
398 | ; Description |
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261 | hidnplayr | 399 | ; Polls the ethernet card for received data. Extracts if present |
400 | ; Depending on the Protocol within the packet: |
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401 | ; ARP : Pass to ARP_handler. This may result in an ARP reply |
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402 | ; being tx'ed |
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403 | ; IP : Store in an IP buffer |
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1 | ha | 404 | ; |
405 | ;*************************************************************************** |
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261 | hidnplayr | 406 | eth_rx: |
407 | xor ax, ax |
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408 | mov [eth_rx_data_len], ax |
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302 | hidnplayr | 409 | call dword [drvr_poll] ; Call the drivers poll function |
1 | ha | 410 | |
261 | hidnplayr | 411 | mov ax, [eth_rx_data_len] |
412 | cmp ax, 0 |
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302 | hidnplayr | 413 | je .exit |
1 | ha | 414 | |
415 | |||
261 | hidnplayr | 416 | ; Check the protocol. Call appropriate handler |
1 | ha | 417 | |
261 | hidnplayr | 418 | mov ax, [ETH_FRAME.Type] ; The address of the protocol word |
1 | ha | 419 | |
261 | hidnplayr | 420 | cmp ax, ETHER_IP |
302 | hidnplayr | 421 | je .is_ip ; It's IP |
1 | ha | 422 | |
261 | hidnplayr | 423 | cmp ax, ETHER_ARP |
302 | hidnplayr | 424 | je .is_arp ; It is ARP |
1 | ha | 425 | |
302 | hidnplayr | 426 | jmp .exit ; If not IP or ARP, ignore |
1 | ha | 427 | |
261 | hidnplayr | 428 | .is_ip: |
429 | inc dword [ip_rx_count] |
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430 | call ether_IP_handler |
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431 | jmp .exit |
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1 | ha | 432 | |
261 | hidnplayr | 433 | .is_arp: |
1 | ha | 434 | |
261 | hidnplayr | 435 | ; At this point, the packet is still in the Ether_buffer |
436 | call arp_handler |
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1 | ha | 437 | |
261 | hidnplayr | 438 | .exit: |
302 | hidnplayr | 439 | ret |