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Kernel: Introduce basic pre-kernel environment

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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
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6
Kernel/VM/MemoryManager.h
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@ -43,16 +43,17 @@ constexpr FlatPtr page_round_down(FlatPtr x)
inline FlatPtr low_physical_to_virtual(FlatPtr physical)
{
return physical + KERNEL_BASE;
return physical + kernel_base;
}
inline FlatPtr virtual_to_low_physical(FlatPtr virtual_)
{
return virtual_ - KERNEL_BASE;
return virtual_ - kernel_base;
}
enum class UsedMemoryRangeType {
LowMemory = 0,
Bootloader,
Kernel,
BootModule,
PhysicalPages,
@ -60,6 +61,7 @@ enum class UsedMemoryRangeType {
static constexpr StringView UserMemoryRangeTypeNames[] {
"Low memory",
"Bootloader",
"Kernel",
"Boot module",
"Physical Pages"