Method InitializeTx

Kernel/src/net/8254x.cpp:202–230

    }
    
    void Intel8254x::InitializeTx(){
        uint64_t txDescPhys = Memory::AllocatePhysicalMemoryBlock(); // The card wants a physical address
        txDescriptors = (t_desc_t*)Memory::GetIOMapping(txDescPhys);
        uint32_t txLow = txDescPhys & 0xFFFFFFFF;
        uint32_t txHigh = txDescPhys >> 32;
        uint32_t txLen = 4096; // Memory block size
        uint32_t txHead = 0;
        uint32_t _txTail = RX_DESC_COUNT; // Offset from base

        txDescriptorsVirt = (void**)kmalloc(TX_DESC_COUNT * sizeof(void*));

        WriteMem32(I8254_REGISTER_TDESC_LO, txLow);
        WriteMem32(I8254_REGISTER_TDESC_HI, txHigh);
        WriteMem32(I8254_REGISTER_TDESC_LEN, txLen);
        WriteMem32(I8254_REGISTER_TDESC_HEAD, txHead);
        WriteMem32(I8254_REGISTER_TDESC_TAIL, _txTail);

        for(int i = 0; i < TX_DESC_COUNT; i++){
            t_desc_t* txd = &txDescriptors[i];
            uint64_t phys = Memory::AllocatePhysicalMemoryBlock();
            txd->addr = phys;
            txd->status = 0;

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

        WriteMem32(I8254_REGISTER_RCTRL, (RCTRL_ENABLE | RCTRL_SBP | RCTRL_UPE | RCTRL_MPE | RCTRL_LPE | RCTRL_BAM | RCTRL_SECRC | BSIZE_4096));
    }

    Intel8254x::Intel8254x(PCIDevice& device) : pciDevice(device){
        assert(device.vendorID != 0xFFFF);