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kern: refactor init (kill identity map, merge cpu on logic)

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Michael Scire 2023-02-21 10:38:48 -07:00 • committed by SciresM
parent 8db22967bf
commit 035cebef9d
20 changed files with 431 additions and 387 deletions
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14
mesosphere/kernel_ldr/source/kern_init_loader.cpp
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@ -62,20 +62,20 @@ namespace ams::kern::init::loader {
}
}
void SetupInitialIdentityMapping(KInitialPageTable &init_pt, uintptr_t base_address, uintptr_t kernel_size, uintptr_t page_table_region, size_t page_table_region_size, KInitialPageTable::PageAllocator &allocator) {
void SetupInitialIdentityMapping(KInitialPageTable &init_pt, uintptr_t base_address, uintptr_t kernel_size, uintptr_t page_table_region, size_t page_table_region_size, KInitialPageAllocator &allocator) {
/* Map in an RWX identity mapping for the kernel. */
constexpr PageTableEntry KernelRWXIdentityAttribute(PageTableEntry::Permission_KernelRWX, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable, PageTableEntry::MappingFlag_Mapped);
init_pt.Map(base_address, kernel_size, base_address, KernelRWXIdentityAttribute, allocator);
init_pt.Map(base_address, kernel_size, base_address, KernelRWXIdentityAttribute, allocator, 0);
/* Map in an RWX identity mapping for ourselves. */
constexpr PageTableEntry KernelLdrRWXIdentityAttribute(PageTableEntry::Permission_KernelRWX, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable, PageTableEntry::MappingFlag_Mapped);
const uintptr_t kernel_ldr_base = util::AlignDown(reinterpret_cast<uintptr_t>(__start__), PageSize);
const uintptr_t kernel_ldr_size = util::AlignUp(reinterpret_cast<uintptr_t>(__end__), PageSize) - kernel_ldr_base;
init_pt.Map(kernel_ldr_base, kernel_ldr_size, kernel_ldr_base, KernelRWXIdentityAttribute, allocator);
init_pt.Map(kernel_ldr_base, kernel_ldr_size, kernel_ldr_base, KernelRWXIdentityAttribute, allocator, 0);
/* Map in the page table region as RW- for ourselves. */
constexpr PageTableEntry PageTableRegionRWAttribute(PageTableEntry::Permission_KernelRW, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable, PageTableEntry::MappingFlag_Mapped);
init_pt.Map(page_table_region, page_table_region_size, page_table_region, KernelRWXIdentityAttribute, allocator);
init_pt.Map(page_table_region, page_table_region_size, page_table_region, KernelRWXIdentityAttribute, allocator, 0);
/* Place the L1 table addresses in the relevant system registers. */
cpu::SetTtbr0El1(init_pt.GetTtbr0L1TableAddress());
@ -194,14 +194,14 @@ namespace ams::kern::init::loader {
/* Map kernel .text as R-X. */
constexpr PageTableEntry KernelTextAttribute(PageTableEntry::Permission_KernelRX, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable, PageTableEntry::MappingFlag_Mapped);
init_pt.Map(virtual_base_address + rx_offset, rx_end_offset - rx_offset, base_address + rx_offset, KernelTextAttribute, g_initial_page_allocator);
init_pt.Map(virtual_base_address + rx_offset, rx_end_offset - rx_offset, base_address + rx_offset, KernelTextAttribute, g_initial_page_allocator, 0);
/* Map kernel .rodata and .rwdata as RW-. */
/* Note that we will later reprotect .rodata as R-- */
constexpr PageTableEntry KernelRoDataAttribute(PageTableEntry::Permission_KernelR, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable, PageTableEntry::MappingFlag_Mapped);
constexpr PageTableEntry KernelRwDataAttribute(PageTableEntry::Permission_KernelRW, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable, PageTableEntry::MappingFlag_Mapped);
init_pt.Map(virtual_base_address + ro_offset, ro_end_offset - ro_offset, base_address + ro_offset, KernelRwDataAttribute, g_initial_page_allocator);
init_pt.Map(virtual_base_address + rw_offset, bss_end_offset - rw_offset, base_address + rw_offset, KernelRwDataAttribute, g_initial_page_allocator);
init_pt.Map(virtual_base_address + ro_offset, ro_end_offset - ro_offset, base_address + ro_offset, KernelRwDataAttribute, g_initial_page_allocator, 0);
init_pt.Map(virtual_base_address + rw_offset, bss_end_offset - rw_offset, base_address + rw_offset, KernelRwDataAttribute, g_initial_page_allocator, 0);
/* Physically randomize the kernel region. */
/* NOTE: Nintendo does this only on 10.0.0+ */