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100 lines
6.6 KiB
HTML
Executable file
100 lines
6.6 KiB
HTML
Executable file
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<pre style="font-family:monospace;font-size:12pt">
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<a name="l1"></a><span class=cF2>/*</span><span class=cF0> </span><span class=cF2>Shrine mentions possibly using two FIFOs</span><span class=cF0>
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<a name="l2"></a> </span><span class=cF2>(in our case, Queues) for pending and</span><span class=cF0>
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<a name="l3"></a> </span><span class=cF2>empty frames. If logical to implement,</span><span class=cF0>
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<a name="l4"></a> </span><span class=cF2>perhaps Zeal NetQueue code should</span><span class=cF0>
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<a name="l5"></a> </span><span class=cF2>do something similar to that idea.</span><span class=cF0>
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<a name="l6"></a>
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<a name="l7"></a> </span><span class=cF2>Each Ethernet Frame will be represented</span><span class=cF0>
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<a name="l8"></a> </span><span class=cF2>as an entry in a CQueue. */</span><span class=cF0>
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<a name="l9"></a>
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<a name="l10"></a></span><span class=cF1>class</span><span class=cF0> CNetQueueEntry:</span><span class=cF9>CQueue</span><span class=cF0>
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<a name="l11"></a>{
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<a name="l12"></a> </span><span class=cF9>I64</span><span class=cF0> packet_length;
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<a name="l13"></a> </span><span class=cF1>U8</span><span class=cF0> frame[ETHERNET_FRAME_SIZE];
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<a name="l14"></a>};
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<a name="l15"></a>
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<a name="l16"></a>
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<a name="l17"></a></span><span class=cF2>/*</span><span class=cF0> </span><span class=cF2>global variable, holds pointer of Ethernet Queue.</span><span class=cF0>
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<a name="l18"></a> </span><span class=cF2>This acts as the Head of the Queue, Entries act</span><span class=cF0>
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<a name="l19"></a> </span><span class=cF2>as the Tail of the Queue. </span><span class=cF0>
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<a name="l20"></a> </span><span class=cF2>Upon QueueInit, ->next and ->last are set to</span><span class=cF0>
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<a name="l21"></a> </span><span class=cF2>itself, the Head. */</span><span class=cF0>
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<a name="l22"></a>
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<a name="l23"></a></span><span class=cF9>CQueue</span><span class=cF0> *net_queue; </span><span class=cF2>// no QueueRemove the Head! only Entries!</span><span class=cF0>
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<a name="l24"></a>
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<a name="l25"></a></span><span class=cF1>U0</span><span class=cF0> NetQueueInit()
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<a name="l26"></a>{
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<a name="l27"></a> net_queue = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF9>CQueue</span><span class=cF7>)</span><span class=cF0>);
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<a name="l28"></a> </span><span class=cF5>QueueInit</span><span class=cF0>(net_queue);
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<a name="l29"></a>}
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<a name="l30"></a>
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<a name="l31"></a>CNetQueueEntry *NetQueuePull()
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<a name="l32"></a>{</span><span class=cF2>/*</span><span class=cF0> </span><span class=cF2>Returns a pointer to a CNetQueueEntry,</span><span class=cF0>
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<a name="l33"></a> </span><span class=cF2>or NULL pointer if Net Queue is empty. */</span><span class=cF0>
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<a name="l34"></a>
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<a name="l35"></a> CNetQueueEntry *entry;
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<a name="l36"></a>
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<a name="l37"></a> </span><span class=cF1>if</span><span class=cF0> (net_queue->next != net_queue)
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<a name="l38"></a> </span><span class=cF7>{</span><span class=cF0>
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<a name="l39"></a> entry = net_queue->next;
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<a name="l40"></a>
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<a name="l41"></a> NetLog(</span><span class=cF6>"NETQUEUE PULL: Removing entry from queue."</span><span class=cF0>);
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<a name="l42"></a> </span><span class=cF5>QueueRemove</span><span class=cF0>(entry);
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<a name="l43"></a> </span><span class=cF7>}</span><span class=cF0>
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<a name="l44"></a> </span><span class=cF1>else</span><span class=cF0> </span><span class=cF2>// Queue is empty if head->next is head itself.</span><span class=cF0>
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<a name="l45"></a> </span><span class=cF7>{</span><span class=cF0>
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<a name="l46"></a> entry = </span><span class=cF3>NULL</span><span class=cF0>;
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<a name="l47"></a> </span><span class=cF7>}</span><span class=cF0>
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<a name="l48"></a>
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<a name="l49"></a> </span><span class=cF1>return</span><span class=cF0> entry;
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<a name="l50"></a>}
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<a name="l51"></a>
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<a name="l52"></a></span><span class=cF1>U0</span><span class=cF0> NetQueuePush(</span><span class=cF1>U8</span><span class=cF0> *data, </span><span class=cF9>I64</span><span class=cF0> length)
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<a name="l53"></a>{</span><span class=cF2>/*</span><span class=cF0> </span><span class=cF2>Pushes a copy of the packet data and length</span><span class=cF0>
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<a name="l54"></a> </span><span class=cF2>into the Net Queue. The NetQueueEntry is inserted</span><span class=cF0>
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<a name="l55"></a> </span><span class=cF2>after the last entry of net_queue to keep new</span><span class=cF0>
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<a name="l56"></a> </span><span class=cF2>items in the back of the Queue, old in front. */</span><span class=cF0>
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<a name="l57"></a>
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<a name="l58"></a> CNetQueueEntry *entry = </span><span class=cF5>CAlloc</span><span class=cF0>(</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CNetQueueEntry</span><span class=cF7>)</span><span class=cF0>);
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<a name="l59"></a>
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<a name="l60"></a> entry->packet_length = length;
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<a name="l61"></a>
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<a name="l62"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(entry->frame, data, length);
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<a name="l63"></a>
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<a name="l64"></a> </span><span class=cF5>QueueInsert</span><span class=cF0>(entry, net_queue->last);
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<a name="l65"></a>
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<a name="l66"></a> </span><span class=cF2>// Generate Net Handler interrupt.</span><span class=cF0>
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<a name="l67"></a> NetLog(</span><span class=cF6>"NETQUEUE PUSH COPY: Generating NetHandler interrupt."</span><span class=cF0>);
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<a name="l68"></a> </span><span class=cF5>MPInt</span><span class=cF0>(I_NETHANDLER, INT_DEST_CPU);
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<a name="l69"></a>}
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<a name="l70"></a>
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<a name="l71"></a>
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<a name="l72"></a>NetQueueInit;</span></pre></body>
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