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Prekernel: Use physical addresses for some of the BootInfo parameters

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The kernel would just turn those virtual addresses into physical
addresses later on, so let's just use physical addresses right from the
start.
This commit is contained in:
Gunnar Beutner
2021-07-19 18:24:15 +02:00
committed by Andreas Kling
parent dd42093b93
commit be795d5812
6 changed files with 58 additions and 59 deletions
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8
Kernel/VM/MemoryManager.cpp
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@@ -197,7 +197,7 @@ UNMAP_AFTER_INIT void MemoryManager::parse_memory_map()
// Register used memory regions that we know of.
m_used_memory_ranges.ensure_capacity(4);
m_used_memory_ranges.append(UsedMemoryRange { UsedMemoryRangeType::LowMemory, PhysicalAddress(0x00000000), PhysicalAddress(1 * MiB) });
m_used_memory_ranges.append(UsedMemoryRange { UsedMemoryRangeType::Prekernel, PhysicalAddress(virtual_to_low_physical(FlatPtr(start_of_prekernel_image))), PhysicalAddress(page_round_up(virtual_to_low_physical(FlatPtr(end_of_prekernel_image)))) });
m_used_memory_ranges.append(UsedMemoryRange { UsedMemoryRangeType::Prekernel, start_of_prekernel_image, end_of_prekernel_image });
m_used_memory_ranges.append(UsedMemoryRange { UsedMemoryRangeType::Kernel, PhysicalAddress(virtual_to_low_physical(FlatPtr(&start_of_kernel_image))), PhysicalAddress(page_round_up(virtual_to_low_physical(FlatPtr(&end_of_kernel_image)))) });
if (multiboot_info_ptr->flags & 0x4) {
@@ -439,10 +439,8 @@ UNMAP_AFTER_INIT void MemoryManager::initialize_physical_pages()
unquickmap_page();
// Hook the page table into the kernel page directory
PhysicalAddress boot_pd_kernel_paddr(virtual_to_low_physical((FlatPtr)boot_pd_kernel));
u32 page_directory_index = (virtual_page_base_for_this_pt >> 21) & 0x1ff;
auto* pd = reinterpret_cast<PageDirectoryEntry*>(quickmap_page(boot_pd_kernel_paddr));
auto* pd = reinterpret_cast<PageDirectoryEntry*>(quickmap_page(boot_pd_kernel));
PageDirectoryEntry& pde = pd[page_directory_index];
VERIFY(!pde.is_present()); // Nothing should be using this PD yet
@@ -991,7 +989,7 @@ PageDirectoryEntry* MemoryManager::quickmap_pd(PageDirectory& directory, size_t
{
VERIFY(s_mm_lock.own_lock());
auto& mm_data = get_data();
auto& pte = ((PageTableEntry*)boot_pd_kernel_pt1023)[(KERNEL_QUICKMAP_PD - KERNEL_PT1024_BASE) / PAGE_SIZE];
auto& pte = boot_pd_kernel_pt1023[(KERNEL_QUICKMAP_PD - KERNEL_PT1024_BASE) / PAGE_SIZE];
auto pd_paddr = directory.m_directory_pages[pdpt_index]->paddr();
if (pte.physical_page_base() != pd_paddr.get()) {
pte.set_physical_page_base(pd_paddr.get());