RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 12:47:45 +00:00
Code Issues Activity Actions

Kernel: Introduce basic pre-kernel environment

Browse source 
This implements a simple bootloader that is capable of loading ELF64
kernel images. It does this by using QEMU/GRUB to load the kernel image
from disk and pass it to our bootloader as a Multiboot module.

The bootloader then parses the ELF image and sets it up appropriately.
The kernel's entry point is a C++ function with architecture-native
code.

Co-authored-by: Liav A <liavalb@gmail.com>
This commit is contained in:
Gunnar Beutner 2021-07-18 14:47:32 +02:00 • committed by Andreas Kling
parent 357ddd393e
commit 7e94b090fe
30 changed files with 1207 additions and 181 deletions
Download patch file Download diff file Expand all files Collapse all files

28
Kernel/Prekernel/multiboot.S Normal file
View file

@ -0,0 +1,28 @@
.code32
.set MULTIBOOT_MAGIC, 0x1badb002
.set MULTIBOOT_PAGE_ALIGN, 0x1
.set MULTIBOOT_MEMORY_INFO, 0x2
.set MULTIBOOT_VIDEO_MODE, 0x4
.set multiboot_flags, MULTIBOOT_PAGE_ALIGN | MULTIBOOT_MEMORY_INFO
.set multiboot_checksum, -(MULTIBOOT_MAGIC + multiboot_flags)
.section .multiboot, "a"
.align 4
.long MULTIBOOT_MAGIC
.long multiboot_flags
.long multiboot_checksum
/* for MULTIBOOT_MEMORY_INFO */
.long 0x00000000 /* header_addr */
.long 0x00000000 /* load_addr */
.long 0x00000000 /* load_end_addr */
.long 0x00000000 /* bss_end_addr */
.long 0x00000000 /* entry_addr */
/* for MULTIBOOT_VIDEO_MODE */
.long 0x00000000 /* mode_type */
.long 1280 /* width */
.long 1024 /* height */
.long 32 /* depth */