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rockOS/kernel/arch/i386/boot/boot.S

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/**
* Boot section of rockOS
* Copyright (C) 2022 Furkan Mudanyali
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, _either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
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# Declare constants for multiboot header
.set ALIGN, 1<<0 # align loaded modules on page boundaries
.set MEMINFO, 1<<1 # provide memory map
.set FLAGS, ALIGN | MEMINFO # multiboot flag field
.set MAGIC, 0x1BADB002 # magic number for bootloader to find header
.set CHECKSUM, -(MAGIC + FLAGS) # checksum of above
# Declare header in multiboot standard
.section .multiboot
.align 4
.long MAGIC
.long FLAGS
.long CHECKSUM
# Reserve a stack for initial thread
.section .bss
.align 16
stack_bottom:
.skip 32768 # 32 KiB
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stack_top:
# kernel entry point
.section .text
.global _start
.type _start, @function
_start:
push %eax
push %ebx
call bootloader_init
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cli
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call gdt_init # initialize the GDT
movl $stack_top, %esp
call terminal_initialize
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call idt_init # initialize the IDT
call PIC_remap
sti
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call paging_init
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call kernel_main # transfer control to main kernel
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# Hang if kernel_main unexpectedly returns
1: hlt
jmp 1b
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.size _start, . - _start