Kernel Loader: Difference between revisions
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void KernelLoader_Main(uintptr_t kernel_base_address, KernelMap *kernel_map, uintptr_t ini1_base_address); | void KernelLoader_Main(uintptr_t kernel_base_address, KernelMap *kernel_map, uintptr_t ini1_base_address); | ||
== | == KernelLdr_Main == | ||
* TODO: Fill in | First, it clears BSS, and then sets SP = <BSS end>. | ||
<pre> | |||
for (uint64_t *i = __bss_start; i != __bss_end; i++) { | |||
*i = 0; | |||
} | |||
SP = __bss_end; | |||
</pre> | |||
Next, it applies relocations to itself and calls its init array. | |||
<pre> | |||
KernelLdr_ApplyRelocations(&KernelLdr_Main, __dynamic_start); | |||
KernelLdr_libc_init_array(); | |||
</pre> | |||
Then, it calls the function which relocates the kernel, and jumps back to the kernel entrypoint. | |||
<pre> | |||
// KernelLdr_LoadKernel returns (relocated_kernel_base - original_kernel_base). | |||
uintptr_t kernel_relocation_offset = KernelLdr_LoadKernel(kernel_base, kernel_map, ini_base); | |||
// dtor called for static page allocator. | |||
g_InitialPageAllocator.~KInitialPageAllocator(); | |||
// Jumps back to the kernel code that called KernelLdr_Main. | |||
((void (*)(void))(kernel_relocation_offset + LR))(); | |||
</pre> | |||
== KernelLdr_ApplyRelocations == | |||
TODO: Fill this out | |||
== KernelLdr_lib_init_array() == | |||
This is just standard libc init array code. .init_array is empty in all available binaries. | |||
== KernelLdr_LoadKernel == | |||
TODO: Fill this out | |||
== KInitialPageAllocator::~KInitialPageAllocator == | |||
This just clears the allocator's next address. | |||
<pre> | |||
this->next_address = 0; | |||
</pre> | |||
== Structures == | == Structures == | ||