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kern: allocate all TTBR0 pages during init, use procidx as asid

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Michael Scire 2024-10-09 14:04:15 -07:00 • committed by SciresM
parent c3fa42d958
commit a72e39d657
9 changed files with 72 additions and 110 deletions
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31
mesosphere/kernel/source/arch/arm64/init/kern_init_core.cpp
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@ -15,6 +15,9 @@
*/
#include <mesosphere.hpp>
extern "C" void __rodata_start();
extern "C" void __rodata_end();
extern "C" void __bin_start__();
extern "C" void __bin_end__();
@ -220,6 +223,31 @@ namespace ams::kern::init {
};
static_assert(kern::arch::arm64::init::IsInitialPageAllocator<KInitialPageAllocatorForFinalizeIdentityMapping>);
void SetupAllTtbr0Entries(KInitialPageTable &init_pt, KInitialPageAllocator &allocator) {
/* Validate that the ttbr0 array is in rodata. */
const uintptr_t rodata_start = reinterpret_cast<uintptr_t>(__rodata_start);
const uintptr_t rodata_end = reinterpret_cast<uintptr_t>(__rodata_end);
MESOSPHERE_INIT_ABORT_UNLESS(rodata_start < rodata_end);
MESOSPHERE_INIT_ABORT_UNLESS(rodata_start <= reinterpret_cast<uintptr_t>(std::addressof(KPageTable::GetTtbr0Entry(0))));
MESOSPHERE_INIT_ABORT_UNLESS(reinterpret_cast<uintptr_t>(std::addressof(KPageTable::GetTtbr0Entry(KPageTable::NumTtbr0Entries))) < rodata_end);
/* Allocate pages for all ttbr0 entries. */
for (size_t i = 0; i < KPageTable::NumTtbr0Entries; ++i) {
/* Allocate a page. */
KPhysicalAddress page = allocator.Allocate(PageSize);
MESOSPHERE_INIT_ABORT_UNLESS(page != Null<KPhysicalAddress>);
/* Check that the page is allowed to be a ttbr0 entry. */
MESOSPHERE_INIT_ABORT_UNLESS((GetInteger(page) & UINT64_C(0xFFFF000000000001)) == 0);
/* Get the physical address of the ttbr0 entry. */
const auto ttbr0_phys_ptr = init_pt.GetPhysicalAddress(KVirtualAddress(std::addressof(KPageTable::GetTtbr0Entry(i))));
/* Set the entry to the newly allocated page. */
*reinterpret_cast<volatile u64 *>(GetInteger(ttbr0_phys_ptr)) = (static_cast<u64>(i) << 48) | GetInteger(page);
}
}
void FinalizeIdentityMapping(KInitialPageTable &init_pt, KInitialPageAllocator &allocator, u64 phys_to_virt_offset) {
/* Create an allocator for identity mapping finalization. */
KInitialPageAllocatorForFinalizeIdentityMapping finalize_allocator(allocator, phys_to_virt_offset);
@ -591,6 +619,9 @@ namespace ams::kern::init {
/* Create page table object for use during remaining initialization. */
KInitialPageTable init_pt;
/* Setup all ttbr0 pages. */
SetupAllTtbr0Entries(init_pt, g_initial_page_allocator);
/* Unmap the identity mapping. */
FinalizeIdentityMapping(init_pt, g_initial_page_allocator, g_phase2_linear_region_phys_to_virt_diff);