xv7: 擴大檔案大小限制 -- 加入雙層間接連結

程式來源 -- https://blog.mky.moe/mit6828/8-lab08/

執行結果

$ make qemu
...

qemu-system-riscv64 -machine virt -bios none -kernel kernel/kernel -m 128M -smp 3 -nographic -drive file=fs.img,if=none,format=raw,id=x0 -device virtio-blk-device,drive=x0,bus=virtio-mmio-bus.0 -netdev user,id=net0,hostfwd=udp::29772-:2000 
-object filter-dump,id=net0,netdev=net0,file=packets.pcap -device e1000,netdev=net0,bus=pcie.0  

xv6 kernel is booting

virtio disk init 0
hart 1 starting
hart 2 starting
init: starting sh
$ bigfile
..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
wrote 65803 blocks
bigfile done; ok