RGBCube/serenity
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10 commits

Author SHA1 Message Date
Gunnar Beutner
3c616ae00f Kernel: Make the kernel independent from specific physical addresses 
Previously the kernel relied on a fixed offset between virtual and
physical addresses based on the kernel's load address. This allows us
to specify an independent offset.
 2021-07-27 13:15:16 +02:00
Gunnar Beutner
4fdee56ba3 Prekernel: Make sure to reload CR3 after modifying the page tables 2021-07-20 15:12:19 +02:00
Gunnar Beutner
05fc75f994 Prekernel: Don't wrap around the PTE index improperly 
The boot_pd0_pts variable contains more than 512 PTEs so we shouldn't
wrap the index here.
 2021-07-20 15:12:19 +02:00
Gunnar Beutner
d29981e4a1 Prekernel: Properly initialize variables 2021-07-20 15:12:19 +02:00
Gunnar Beutner
56f952a5f2 Prekernel: Don't assume that PT_LOAD headers are ordered by address 
These headers are ordered by virtual address - at least with GCC - but
that might not always be the case.
 2021-07-20 15:12:19 +02:00
Gunnar Beutner
be795d5812 Prekernel: Use physical addresses for some of the BootInfo parameters 
The kernel would just turn those virtual addresses into physical
addresses later on, so let's just use physical addresses right from the
start.
 2021-07-20 15:12:19 +02:00
Gunnar Beutner
dd42093b93 Kernel: Move boot info declarations to a header file 
Instead of manually redeclaring those variables in various files this
now adds a header file for them.
 2021-07-20 15:12:19 +02:00
Gunnar Beutner
69fd68b1c8 Prekernel: Make sure we're not overwriting the ELF header 
This copies the ELF header because we might end up overwriting when
loading the ELF sections.
 2021-07-20 01:50:55 +02:00
Gunnar Beutner
3678f78bfb Prekernel: Make sure the last few bytes of the kernel image are mapped 
Depending on the exact layout of the .ksyms section the kernel would
fail to boot because the kernel_load_end variable didn't account for the
section's size.
 2021-07-19 17:47:54 +02:00
Gunnar Beutner
7e94b090fe Kernel: Introduce basic pre-kernel environment 
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>
 2021-07-18 17:31:13 +02:00