Method InitializeRx

Kernel/src/net/8254x.cpp:172–200

    }

    void Intel8254x::InitializeRx(){
        uint64_t rxDescPhys = Memory::AllocatePhysicalMemoryBlock(); // The card wants a physical address
        rxDescriptors = (r_desc_t*)Memory::GetIOMapping(rxDescPhys);
        uint32_t rxLow = rxDescPhys & 0xFFFFFFFF;
        uint32_t rxHigh = rxDescPhys >> 32;
        uint32_t rxLen = 4096; // Memory block size
        uint32_t rxHead = 0;
        uint32_t _rxTail = RX_DESC_COUNT; // Offset from base

        rxDescriptorsVirt = (void**)kmalloc(RX_DESC_COUNT * sizeof(void*));

        WriteMem32(I8254_REGISTER_RDESC_LO, rxLow);
        WriteMem32(I8254_REGISTER_RDESC_HI, rxHigh);
        WriteMem32(I8254_REGISTER_RDESC_LEN, rxLen);
        WriteMem32(I8254_REGISTER_RDESC_HEAD, rxHead);
        WriteMem32(I8254_REGISTER_RDESC_TAIL, _rxTail);

        for(int i = 0; i < RX_DESC_COUNT; i++){
            r_desc_t* rxd = &rxDescriptors[i];
            uint64_t phys = Memory::AllocatePhysicalMemoryBlock();
            rxd->addr = phys;
            rxd->status = 0;

            rxDescriptorsVirt[i] = Memory::KernelAllocate4KPages(1);
            Memory::KernelMapVirtualMemory4K(phys, (uintptr_t)rxDescriptorsVirt[i], 1);
        }

        WriteMem32(I8254_REGISTER_TCTRL, (TCTRL_ENABLE | TCTRL_PSP));
    }
    
    void Intel8254x::InitializeTx(){
        uint64_t txDescPhys = Memory::AllocatePhysicalMemoryBlock(); // The card wants a physical address