Kernel Loader: Difference between revisions
| Line 182: | Line 182: | ||
void KernelLdr_MapInitialIdentityMapping(KInitialPageTable *ttbr1_page_table, uintptr_t kernel_base, uintptr_t kernel_size, | void KernelLdr_MapInitialIdentityMapping(KInitialPageTable *ttbr1_page_table, uintptr_t kernel_base, uintptr_t kernel_size, | ||
uintptr_t page_tables_base, uintptr_t page_tables_size, InitialPageAllocator *allocator); | uintptr_t page_tables_base, uintptr_t page_tables_size, InitialPageAllocator *allocator); | ||
First, this creates a new page table (eventually ends up in TTBR0_EL1), and adds identity mappings for Kernel, KernelLdr, and the Page Table region to it. | |||
<pre> | <pre> | ||
// | // Create new KInitialPageTable | ||
KInitialPageTable ttbr0_page_table(allocator); | |||
// Maps kernel with RWX identity mapping. | |||
attribute = 0x40000000000708; | |||
ttbr0_page_table.Map(kernel_base, kernel_size, kernel_base, &attribute, allocator); | |||
// Maps kernel loader with RWX identity mapping. | |||
attribute = 0x40000000000708; | |||
ttbr0_page_table.Map(__start, __end - __start, __start, &attribute, allocator); | |||
// Maps page table region with RW- identity mapping. | |||
attribute = 0x60000000000708; | |||
ttbr0_page_table.Map(page_tables_base, page_tables_size, page_tables_base, &attribute, allocator); | |||
</pre> | </pre> | ||
TODO: More stuff | |||
== KernelLdr_RelocateKernelPhysically == | == KernelLdr_RelocateKernelPhysically == | ||