On 25.05.20 18:04, Martin Lucina wrote:
Hi,I'm trying to bootstrap a new PVH-only Xen domU OS "from scratch", to replace our existing use of Mini-OS for the early boot/low-level support layer in MirageOS. I've done this by creating new Xen bindings for Solo5 [1], basing them on our existing virtio code [2]. Unfortunately, I can't seem to get past the first few instructions on VCPU boot. Here's what I have at the moment (abridged): .section .note.solo5.xen .align 4 .long 4 .long 4 .long XEN_ELFNOTE_PHYS32_ENTRY .ascii "Xen\0" .long _start32 /* ... */ .code32 ENTRY(_start32) cld lgdt (gdt64_ptr) ljmp $0x10, $1f
You need to setup virtual addressing and enable 64 bit mode before using 64-bit GDT. See Mini-OS source arch/x86/x86_hvm.S Juergen
