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Kernel: Support loading the kernel at almost arbitrary virtual addresses

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This enables further work on implementing KASLR by adding relocation
support to the pre-kernel and updating the kernel to be less dependent
on specific virtual memory layouts.
This commit is contained in:
Gunnar Beutner 2021-07-26 15:10:51 +02:00 • committed by Andreas Kling
parent e3d2ca6bd2
commit 57417a3d6e
20 changed files with 123 additions and 87 deletions
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6
Kernel/init.cpp
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@ -110,8 +110,9 @@ static Processor s_bsp_processor; // global but let's keep it "private"
extern "C" {
READONLY_AFTER_INIT PhysicalAddress start_of_prekernel_image;
READONLY_AFTER_INIT PhysicalAddress end_of_prekernel_image;
READONLY_AFTER_INIT FlatPtr kernel_base;
READONLY_AFTER_INIT size_t physical_to_virtual_offset;
READONLY_AFTER_INIT FlatPtr kernel_mapping_base;
READONLY_AFTER_INIT FlatPtr kernel_load_base;
#if ARCH(X86_64)
READONLY_AFTER_INIT PhysicalAddress boot_pml4t;
#endif
@ -140,7 +141,8 @@ extern "C" [[noreturn]] UNMAP_AFTER_INIT void init(BootInfo const& boot_info)
start_of_prekernel_image = PhysicalAddress { boot_info.start_of_prekernel_image };
end_of_prekernel_image = PhysicalAddress { boot_info.end_of_prekernel_image };
physical_to_virtual_offset = boot_info.physical_to_virtual_offset;
kernel_base = boot_info.kernel_base;
kernel_mapping_base = boot_info.kernel_mapping_base;
kernel_load_base = boot_info.kernel_load_base;
#if ARCH(X86_64)
gdt64ptr = boot_info.gdt64ptr;
code64_sel = boot_info.code64_sel;