Add partial multiboot2 support
This commit is contained in:
Mathieu Maret
Mathieu Maret
parent
107bcedf90
commit
01d54dea85
10
README.md
10
README.md
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@ -49,6 +49,16 @@ modify the disk image with your favorit tool (e.g. gparted) and re-generate disk
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sfdisk -d > disk.sfdisk
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# Multiboot
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In arch/x86/boot, you can choose the assembly used to start the C part by removing the .opt extension
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* boot.asm: intel syntax with multiboot support
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* boot.S: GNU As syntax with multiboot support
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* boot_multiboot2.S: GNU As syntax with multiboot2 support
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/!\ multiboot2 is not supported by qemu for -kernel option (https://gitlab.com/qemu-project/qemu/-/issues/389).
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So you may have to use the fd.iso image and modify the grub configuration from `multiboot /boot/kernel` to `multiboot2 /boot/kernel`
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# Features
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@ -0,0 +1,125 @@
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/* Inspired by from https://www.gnu.org/software/grub/manual/multiboot2/multiboot.html#boot_002eS */
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/* boot.S - bootstrap the kernel */
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/* Copyright (C) 1999, 2001, 2010 Free Software Foundation, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define ASM_FILE 1
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#include <multiboot2.h>
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.section .multiboot
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.align 4
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/* Multiboot header. */
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multiboot_header:
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/* magic */
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.long MULTIBOOT2_HEADER_MAGIC
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/* ISA: i386 */
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.long MULTIBOOT_ARCHITECTURE_I386
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/* Header length. */
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.long multiboot_header_end - multiboot_header
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/* checksum */
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.long -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT_ARCHITECTURE_I386 + (multiboot_header_end - multiboot_header))
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multiboot_header_end:
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.section .bss
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.align 4096
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stack_bottom:
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.skip 16384 # 16 KiB
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stack_top:
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.section .text
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.global _start
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.type _start, @function
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_start:
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/*
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The bootloader has loaded us into 32-bit protected mode on a x86
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machine. Interrupts are disabled. Paging is disabled. The processor
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state is as defined in the multiboot standard. The kernel has full
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control of the CPU. The kernel can only make use of hardware features
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and any code it provides as part of itself. There's no printf
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function, unless the kernel provides its own <stdio.h> header and a
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printf implementation. There are no security restrictions, no
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safeguards, no debugging mechanisms, only what the kernel provides
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itself. It has absolute and complete power over the
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machine.
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*/
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/*
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To set up a stack, we set the esp register to point to the top of our
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stack (as it grows downwards on x86 systems). This is necessarily done
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in assembly as languages such as C cannot function without a stack.
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*/
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mov $stack_top, %esp
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mov $stack_bottom, %ebp
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/*
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This is a good place to initialize crucial processor state before the
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high-level kernel is entered. It's best to minimize the early
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environment where crucial features are offline. Note that the
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processor is not fully initialized yet: Features such as floating
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point instructions and instruction set extensions are not initialized
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yet. The GDT should be loaded here. Paging should be enabled here.
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C++ features such as global constructors and exceptions will require
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runtime support to work as well.
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*/
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/* Reset EFLAGS. */
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pushl $0
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popf
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/*
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Enter the high-level kernel. The ABI requires the stack is 16-byte
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aligned at the time of the call instruction (which afterwards pushes
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the return pointer of size 4 bytes). The stack was originally 16-byte
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aligned above and we've since pushed a multiple of 16 bytes to the
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stack since (pushed 0 bytes so far) and the alignment is thus
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preserved and the call is well defined.
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*/
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/* Push the pointer to the Multiboot information structure. */
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pushl %ebx
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/* Push the magic value. */
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pushl %eax
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call kmain
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/*
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If the system has nothing more to do, put the computer into an
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infinite loop. To do that:
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1) Disable interrupts with cli (clear interrupt enable in eflags).
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They are already disabled by the bootloader, so this is not needed.
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Mind that you might later enable interrupts and return from
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kernel_main (which is sort of nonsensical to do).
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2) Wait for the next interrupt to arrive with hlt (halt instruction).
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Since they are disabled, this will lock up the computer.
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3) Jump to the hlt instruction if it ever wakes up due to a
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non-maskable interrupt occurring or due to system management mode.
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*/
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cli
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1: hlt
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jmp 1b
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/*
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Set the size of the _start symbol to the current location '.' minus its start.
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This is useful when debugging or when you implement call tracing.
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*/
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.size _start, . - _start
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.global _stack_bottom
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_stack_bottom:
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.long stack_bottom
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.global _stack_top
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_stack_top:
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.long stack_top
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@ -0,0 +1,418 @@
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/* Taken from https://www.gnu.org/software/grub/manual/multiboot2/multiboot.html#multiboot2_002eh */
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/* multiboot2.h - Multiboot 2 header file. */
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/* Copyright (C) 1999,2003,2007,2008,2009,2010 Free Software Foundation, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL ANY
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* DEVELOPER OR DISTRIBUTOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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* IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef MULTIBOOT_HEADER
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#define MULTIBOOT_HEADER 1
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/* How many bytes from the start of the file we search for the header. */
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#define MULTIBOOT_SEARCH 32768
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#define MULTIBOOT_HEADER_ALIGN 8
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/* The magic field should contain this. */
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#define MULTIBOOT2_HEADER_MAGIC 0xe85250d6
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/* This should be in %eax. */
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#define MULTIBOOT2_BOOTLOADER_MAGIC 0x36d76289
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/* Alignment of multiboot modules. */
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#define MULTIBOOT_MOD_ALIGN 0x00001000
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/* Alignment of the multiboot info structure. */
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#define MULTIBOOT_INFO_ALIGN 0x00000008
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/* Flags set in the ’flags’ member of the multiboot header. */
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#define MULTIBOOT_TAG_ALIGN 8
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#define MULTIBOOT_TAG_TYPE_END 0
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#define MULTIBOOT_TAG_TYPE_CMDLINE 1
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#define MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME 2
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#define MULTIBOOT_TAG_TYPE_MODULE 3
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#define MULTIBOOT_TAG_TYPE_BASIC_MEMINFO 4
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#define MULTIBOOT_TAG_TYPE_BOOTDEV 5
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#define MULTIBOOT_TAG_TYPE_MMAP 6
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#define MULTIBOOT_TAG_TYPE_VBE 7
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#define MULTIBOOT_TAG_TYPE_FRAMEBUFFER 8
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#define MULTIBOOT_TAG_TYPE_ELF_SECTIONS 9
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#define MULTIBOOT_TAG_TYPE_APM 10
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#define MULTIBOOT_TAG_TYPE_EFI32 11
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#define MULTIBOOT_TAG_TYPE_EFI64 12
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#define MULTIBOOT_TAG_TYPE_SMBIOS 13
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#define MULTIBOOT_TAG_TYPE_ACPI_OLD 14
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#define MULTIBOOT_TAG_TYPE_ACPI_NEW 15
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#define MULTIBOOT_TAG_TYPE_NETWORK 16
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#define MULTIBOOT_TAG_TYPE_EFI_MMAP 17
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#define MULTIBOOT_TAG_TYPE_EFI_BS 18
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#define MULTIBOOT_TAG_TYPE_EFI32_IH 19
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#define MULTIBOOT_TAG_TYPE_EFI64_IH 20
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#define MULTIBOOT_TAG_TYPE_LOAD_BASE_ADDR 21
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#define MULTIBOOT_HEADER_TAG_END 0
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#define MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST 1
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#define MULTIBOOT_HEADER_TAG_ADDRESS 2
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#define MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS 3
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#define MULTIBOOT_HEADER_TAG_CONSOLE_FLAGS 4
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#define MULTIBOOT_HEADER_TAG_FRAMEBUFFER 5
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#define MULTIBOOT_HEADER_TAG_MODULE_ALIGN 6
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#define MULTIBOOT_HEADER_TAG_EFI_BS 7
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#define MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI32 8
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#define MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI64 9
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#define MULTIBOOT_HEADER_TAG_RELOCATABLE 10
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#define MULTIBOOT_ARCHITECTURE_I386 0
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#define MULTIBOOT_ARCHITECTURE_MIPS32 4
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#define MULTIBOOT_HEADER_TAG_OPTIONAL 1
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#define MULTIBOOT_LOAD_PREFERENCE_NONE 0
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#define MULTIBOOT_LOAD_PREFERENCE_LOW 1
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#define MULTIBOOT_LOAD_PREFERENCE_HIGH 2
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#define MULTIBOOT_CONSOLE_FLAGS_CONSOLE_REQUIRED 1
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#define MULTIBOOT_CONSOLE_FLAGS_EGA_TEXT_SUPPORTED 2
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#ifndef ASM_FILE
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typedef unsigned char multiboot_uint8_t;
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typedef unsigned short multiboot_uint16_t;
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typedef unsigned int multiboot_uint32_t;
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typedef unsigned long long multiboot_uint64_t;
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struct multiboot_header
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{
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/* Must be MULTIBOOT_MAGIC - see above. */
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multiboot_uint32_t magic;
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/* ISA */
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multiboot_uint32_t architecture;
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/* Total header length. */
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multiboot_uint32_t header_length;
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/* The above fields plus this one must equal 0 mod 2^32. */
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multiboot_uint32_t checksum;
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};
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struct multiboot_header_tag
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{
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multiboot_uint16_t type;
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multiboot_uint16_t flags;
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multiboot_uint32_t size;
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};
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struct multiboot_header_tag_information_request
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{
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multiboot_uint16_t type;
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multiboot_uint16_t flags;
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multiboot_uint32_t size;
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multiboot_uint32_t requests[0];
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};
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struct multiboot_header_tag_address
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{
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multiboot_uint16_t type;
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multiboot_uint16_t flags;
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multiboot_uint32_t size;
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multiboot_uint32_t header_addr;
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multiboot_uint32_t load_addr;
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multiboot_uint32_t load_end_addr;
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multiboot_uint32_t bss_end_addr;
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};
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struct multiboot_header_tag_entry_address
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{
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multiboot_uint16_t type;
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multiboot_uint16_t flags;
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multiboot_uint32_t size;
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multiboot_uint32_t entry_addr;
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};
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struct multiboot_header_tag_console_flags
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{
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multiboot_uint16_t type;
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multiboot_uint16_t flags;
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multiboot_uint32_t size;
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multiboot_uint32_t console_flags;
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};
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struct multiboot_header_tag_framebuffer
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{
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multiboot_uint16_t type;
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multiboot_uint16_t flags;
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multiboot_uint32_t size;
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multiboot_uint32_t width;
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multiboot_uint32_t height;
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multiboot_uint32_t depth;
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};
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struct multiboot_header_tag_module_align
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{
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multiboot_uint16_t type;
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multiboot_uint16_t flags;
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multiboot_uint32_t size;
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};
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struct multiboot_header_tag_relocatable
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{
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multiboot_uint16_t type;
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multiboot_uint16_t flags;
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multiboot_uint32_t size;
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multiboot_uint32_t min_addr;
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multiboot_uint32_t max_addr;
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multiboot_uint32_t align;
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multiboot_uint32_t preference;
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};
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struct multiboot_color
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{
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multiboot_uint8_t red;
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multiboot_uint8_t green;
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multiboot_uint8_t blue;
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};
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struct multiboot_mmap_entry
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{
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multiboot_uint64_t addr;
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multiboot_uint64_t len;
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#define MULTIBOOT_MEMORY_AVAILABLE 1
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#define MULTIBOOT_MEMORY_RESERVED 2
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#define MULTIBOOT_MEMORY_ACPI_RECLAIMABLE 3
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#define MULTIBOOT_MEMORY_NVS 4
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#define MULTIBOOT_MEMORY_BADRAM 5
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multiboot_uint32_t type;
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multiboot_uint32_t zero;
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};
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typedef struct multiboot_mmap_entry multiboot_memory_map_t;
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struct multiboot_tag
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{
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multiboot_uint32_t type;
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multiboot_uint32_t size;
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};
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struct multiboot_tag_string
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{
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multiboot_uint32_t type;
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multiboot_uint32_t size;
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char string[0];
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};
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struct multiboot_tag_module
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{
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multiboot_uint32_t type;
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multiboot_uint32_t size;
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multiboot_uint32_t mod_start;
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multiboot_uint32_t mod_end;
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char cmdline[0];
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};
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struct multiboot_tag_basic_meminfo
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{
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multiboot_uint32_t type;
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multiboot_uint32_t size;
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multiboot_uint32_t mem_lower;
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multiboot_uint32_t mem_upper;
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};
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struct multiboot_tag_bootdev
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{
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multiboot_uint32_t type;
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multiboot_uint32_t size;
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multiboot_uint32_t biosdev;
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multiboot_uint32_t slice;
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multiboot_uint32_t part;
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};
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struct multiboot_tag_mmap
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{
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multiboot_uint32_t type;
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multiboot_uint32_t size;
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multiboot_uint32_t entry_size;
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multiboot_uint32_t entry_version;
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struct multiboot_mmap_entry entries[0];
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};
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struct multiboot_vbe_info_block
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{
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multiboot_uint8_t external_specification[512];
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};
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struct multiboot_vbe_mode_info_block
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{
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multiboot_uint8_t external_specification[256];
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};
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struct multiboot_tag_vbe
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{
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multiboot_uint32_t type;
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multiboot_uint32_t size;
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multiboot_uint16_t vbe_mode;
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multiboot_uint16_t vbe_interface_seg;
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multiboot_uint16_t vbe_interface_off;
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multiboot_uint16_t vbe_interface_len;
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struct multiboot_vbe_info_block vbe_control_info;
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struct multiboot_vbe_mode_info_block vbe_mode_info;
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};
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struct multiboot_tag_framebuffer_common
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{
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multiboot_uint32_t type;
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multiboot_uint32_t size;
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multiboot_uint64_t framebuffer_addr;
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multiboot_uint32_t framebuffer_pitch;
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multiboot_uint32_t framebuffer_width;
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multiboot_uint32_t framebuffer_height;
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multiboot_uint8_t framebuffer_bpp;
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#define MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED 0
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#define MULTIBOOT_FRAMEBUFFER_TYPE_RGB 1
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#define MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT 2
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multiboot_uint8_t framebuffer_type;
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multiboot_uint16_t reserved;
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};
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struct multiboot_tag_framebuffer
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{
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struct multiboot_tag_framebuffer_common common;
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union
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{
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struct
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{
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multiboot_uint16_t framebuffer_palette_num_colors;
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struct multiboot_color framebuffer_palette[0];
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};
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struct
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{
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multiboot_uint8_t framebuffer_red_field_position;
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multiboot_uint8_t framebuffer_red_mask_size;
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multiboot_uint8_t framebuffer_green_field_position;
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multiboot_uint8_t framebuffer_green_mask_size;
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multiboot_uint8_t framebuffer_blue_field_position;
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multiboot_uint8_t framebuffer_blue_mask_size;
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};
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};
|
||||
};
|
||||
|
||||
struct multiboot_tag_elf_sections
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint32_t num;
|
||||
multiboot_uint32_t entsize;
|
||||
multiboot_uint32_t shndx;
|
||||
char sections[0];
|
||||
};
|
||||
|
||||
struct multiboot_tag_apm
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint16_t version;
|
||||
multiboot_uint16_t cseg;
|
||||
multiboot_uint32_t offset;
|
||||
multiboot_uint16_t cseg_16;
|
||||
multiboot_uint16_t dseg;
|
||||
multiboot_uint16_t flags;
|
||||
multiboot_uint16_t cseg_len;
|
||||
multiboot_uint16_t cseg_16_len;
|
||||
multiboot_uint16_t dseg_len;
|
||||
};
|
||||
|
||||
struct multiboot_tag_efi32
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint32_t pointer;
|
||||
};
|
||||
|
||||
struct multiboot_tag_efi64
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint64_t pointer;
|
||||
};
|
||||
|
||||
struct multiboot_tag_smbios
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint8_t major;
|
||||
multiboot_uint8_t minor;
|
||||
multiboot_uint8_t reserved[6];
|
||||
multiboot_uint8_t tables[0];
|
||||
};
|
||||
|
||||
struct multiboot_tag_old_acpi
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint8_t rsdp[0];
|
||||
};
|
||||
|
||||
struct multiboot_tag_new_acpi
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint8_t rsdp[0];
|
||||
};
|
||||
|
||||
struct multiboot_tag_network
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint8_t dhcpack[0];
|
||||
};
|
||||
|
||||
struct multiboot_tag_efi_mmap
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint32_t descr_size;
|
||||
multiboot_uint32_t descr_vers;
|
||||
multiboot_uint8_t efi_mmap[0];
|
||||
};
|
||||
|
||||
struct multiboot_tag_efi32_ih
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint32_t pointer;
|
||||
};
|
||||
|
||||
struct multiboot_tag_efi64_ih
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint64_t pointer;
|
||||
};
|
||||
|
||||
struct multiboot_tag_load_base_addr
|
||||
{
|
||||
multiboot_uint32_t type;
|
||||
multiboot_uint32_t size;
|
||||
multiboot_uint32_t load_base_addr;
|
||||
};
|
||||
|
||||
#endif /* ! ASM_FILE */
|
||||
|
||||
#endif /* ! MULTIBOOT_HEADER */
|
||||
Loading…
Reference in New Issue