Hello, I runn kernel with grub in qemu, connected with gdb and put break point to 0x10200 (to this jump - https://github.com/torvalds/linux/blob/master/arch/x86/boot/header.S#L297) Registers value are following: eax 0x1020 4128 ecx 0x0 0 edx 0x100000 1048576 ebx 0x0 0 esp 0xf7f4 0xf7f4 ebp 0x0 0x0 esi 0x1ac7c 109692 edi 0x0 0 eip 0x68 0x68 eflags 0x2 [ ] cs 0x1020 4128 ss 0x1000 4096 ds 0x1000 4096 es 0x1000 4096 fs 0x1000 4096 gs 0x1000 4096 Seems that segment registers are corret, but why esp is 0xf7f4? Thank you.