| // 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" |
| |
| // The linker script places this first in the image. Multiboot only |
| // requires that it appear word-aligned anywhere in the first 8192 bytes. |
| .section .boot.header, "a", %progbits |
| |
| // The Multiboot header identifies this as a Multiboot-compliant OS image |
| // and requires that the boot loader provide the memory map. The rest of |
| // of the loading details duplicate the information in the ELF file and |
| // program headers. The boot loader should do the same thing whether it |
| // uses the multiboot_header_t here or the ELF e_entry and PT_LOAD headers. |
| |
| .object multiboot_header, data, align=4, nosection=nosection |
| .int MULTIBOOT_HEADER_MAGIC // magic |
| .int MULTIBOOT_HEADER_FLAGS // flags |
| .int -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) // checksum |
| .int multiboot_header // header_addr |
| .int PHYS_LOAD_ADDRESS // load_addr |
| .int PHYS_LOAD_END // load_end |
| .int _end // bss_end_addr |
| .int _start // entry_addr |
| .end_object |
