| // Copyright 2020 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #include <lib/arch/asm.h> |
| |
| #include "multiboot.h" |
| |
| // This is the Multiboot entry point. The boot loader passes arguments |
| // in %eax and %ebx. A Multiboot-compliant boot loader provides a |
| // usable 32-bit segmentation environment with flat segments, but does |
| // not provide a stack. |
| .function _start, global |
| cmp $MULTIBOOT_BOOTLOADER_MAGIC, %eax |
| jne .Lbad_multiboot_magic |
| mov %ebx, %esi |
| jmp Phys32Entry |
| |
| .Lbad_multiboot_magic: |
| ud2 |
| jmp .Lbad_multiboot_magic |
| .end_function |
