uefi-ref/nasm-uefi
1
0
Fork 0
mirror of https://github.com/charlesap/nasm-uefi synced 2026-08-26 12:23:04 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions
No description
13 commits 1 branch 0 tags 2.1 MiB
Find a file
Charles Perkins 9613291eab generalize
2020-12-24 08:06:10 -08:00
launch.sh add launch and watch scripts 2019-06-01 11:39:54 -07:00
LICENSE Initial commit 2019-04-25 14:47:44 -07:00
OVMF.fd add UEFI rom, disk image, update README 2019-04-25 15:01:43 -07:00
README.md generalize 2020-12-24 08:06:10 -08:00
shoe.asm send serial to stdio 2020-12-23 16:59:48 -08:00
toe.asm send serial to stdio 2020-12-23 16:59:48 -08:00
uefi.iso remove data in relocatable section 2019-04-25 15:07:50 -07:00
watch.sh add launch and watch scripts 2019-06-01 11:39:54 -07:00
yo.asm adjust offsets 2019-05-13 15:12:24 -07:00

README.md

asm-uefi

bare-bones assembly uefi shoe loader

assemble with:

  • nasm -f bin shoex8664.asm -o shoex8664.efi
  • dd if=toex8664.bin of=shoex8664.efi bs=1 seek=20480 conv=notrunc

combine with:

  • sudo mount disk.iso mnt
  • sudo cp shoex8664.efi mnt/EFI/BOOT/BOOTX64.EFI
  • sudo cp shoeamd64.efi mnt/EFI/BOOT/BOOTAA64.EFI
  • sudo cp shoeamd32.efi mnt/EFI/BOOT/BOOTAA32.EFI
  • sudo cp shoeriscv64.efi mnt/EFI/BOOT/BOOTRV64.EFI
  • sudo cp shoeriscv32.efi mnt/EFI/BOOT/BOOTRV32.EFI
  • sudo umount mnt

get asm listing with:

  • objdump -Mintel -d shoe.efi

show the bytes of the payload:

  • hexdump -ve '1/1 "%.2x "' toe.bin

Launch QEMU with:

x86-64:

  • /usr/bin/qemu-system-x86_64 -machine accel=kvm -name guest=uefiguest -machine pc,accel=kvm,usb=off,dump-guest-core=off -smp 2,sockets=2,cores=1,threads=1 -uuid 515645b7-ab3a-4e82-ba62-25751e4b523f -bios ./OVMF.fd -m 1G -vga qxl -spice port=5900,addr=127.0.0.1,disable-ticketing -drive file=disk.iso -serial stdio

aarch64: /opt/qemu-risc6/aarch64-softmmu/qemu-system-aarch64 -m 1024 -cpu cortex-a57 -M virt -name guest=uefiguest -bios ./AARCH64-FLASH.img -smp 2,sockets==1,threads=1 -uuid 515645b7-ab3a-4e82-ba62-25751e4b523f -m 1G -display gtk -monitor stdio -drive file=disk.iso

Launch the Spice viewer with:

  • remote-viewer spice://localhost:5900