888
edits
Changes
Jump to navigation
Jump to search
Line 182:
Line 182: + + + − + + + + + + + + + + + + + + + +
→KernelLdr_MapInitialIdentityMapping
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>
// TODO: Fill this out with pseudocode.
// 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 ==