Memory Virtual address parsing

package main

import (
    "fmt"
)

func VAtoOffsets(va uint64) {
    phy_offset := va & 0xFFF
    pt_index := (va >> 12) & 0x1FF
    pde_index := (va >> (12 + 9)) & 0x1FF
    pdpt_index := (va >> (12 + 9 + 9)) & 0x1FF
    pml4_index := (va >> (12 + 9 + 9 + 9)) & 0x1FF

    fmt.Printf("PML4 Index: %03x\n", pml4_index)
    fmt.Printf("PDPT Index: %03x\n", pdpt_index)
    fmt.Printf("PDE Index: %03x\n", pde_index)
    fmt.Printf("PT Index: %03x\n", pt_index)
    fmt.Printf("Page offset: %03x\n", phy_offset)

}

func OffsetsToVA(phy_offset, pt_index, pde_index, pdpt_index, pml4_index uint64) {
    var va uint64

    va = pml4_index << (12 + 9 + 9 + 9)
    va = va | pdpt_index << (12 + 9 + 9)
    va = va | pde_index << (12 + 9)
    va = va | pt_index << 12
    va = va | phy_offset

    if ((va & 0x800000000000) == 0x800000000000) {
        va |= 0xFFFF000000000000
    }

    fmt.Printf("Virtual Address: %x\n", va)
}

func main() {
    VAtoOffsets(0xffff804020100000)
    OffsetsToVA(0, 0x100, 0x100, 0x100, 0x100)
}