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https://github.com/Zeal-Operating-System/ZealOS.git
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55 lines
No EOL
1.4 KiB
HolyC
Executable file
55 lines
No EOL
1.4 KiB
HolyC
Executable file
class CEthernetFrame
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{
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U8 source_address[6];
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U8 padding[2];
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U8 destination_address[6];
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U16 ethertype;
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U8 *data;
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I64 length;
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};
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class CEthernetGlobals
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{
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U8 ethernet_null[6];
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U8 ethernet_broadcast[6];
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} ethernet_globals;
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U0 EthernetGlobalsInit()
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{
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I64 i;
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for (i = 0; i < 6; i++)
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{
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ethernet_globals.ethernet_null[i] = 0;
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ethernet_globals.ethernet_broadcast[i] = 0xFF;
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}
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}
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//TODO: check length , figure out the length+4
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U0 EthernetFrameParse(CEthernetFrame *frame_out, U8 *frame, U16 length)
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{
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//TODO: Check length ! We need to figure out what
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//lengths are appropriate
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//Shrine also says MemCopy has a
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//high overhead. Almost tempted to say that means that a lot
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//of the current system should be done with less extra allocation
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//altogether, more passing.
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//In practice, MemCopy causes the most slowdown on bare-metal.
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NetLog("ETHERNET FRAME PARSE: Parsing frame, copying out to frame_out param.");
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MemCopy(frame_out->destination_address, frame, MAC_ADDRESS_LENGTH);
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MemCopy(frame_out->source_address, frame + MAC_ADDRESS_LENGTH, MAC_ADDRESS_LENGTH);
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frame_out->ethertype = frame[ETHERNET_ETHERTYPE_OFFSET + 1] | frame[ETHERNET_ETHERTYPE_OFFSET] << 8;
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frame_out->data = frame + ETHERNET_DATA_OFFSET;
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frame_out->length = length - ETHERNET_MAC_HEADER_LENGTH - 4; // He has a comment literally just saying "??". + or - 4?
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}
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EthernetGlobalsInit; |