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Kernel: Don't reserve Low Memory (0-1MB) on non-x86 architectures

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This memory is only reserved on x86(-64) and is usable on other
architectures.
This commit is contained in:
Timon Kruiper 2022-09-20 22:13:31 +02:00 committed by Andreas Kling
parent 1b60126d93
commit 424a974e01
Notes: sideshowbarker 2024-07-17 06:30:25 +09:00 
Author: https://github.com/FireFox317
Commit: https://github.com/SerenityOS/serenity/commit/424a974e01
Pull-request: https://github.com/SerenityOS/serenity/pull/15309
Reviewed-by: https://github.com/bgianfo
Reviewed-by: https://github.com/bugreport0
Reviewed-by: https://github.com/nico ✅
1 changed files with 2 additions and 0 deletions
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2
Kernel/Memory/MemoryManager.cpp
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@ -243,7 +243,9 @@ UNMAP_AFTER_INIT void MemoryManager::parse_memory_map()
// Register used memory regions that we know of. // Register used memory regions that we know of.
m_global_data.with([&](auto& global_data) { m_global_data.with([&](auto& global_data) {
global_data.used_memory_ranges.ensure_capacity(4); global_data.used_memory_ranges.ensure_capacity(4);
#if ARCH(I386) || ARCH(X86_64)
global_data.used_memory_ranges.append(UsedMemoryRange { UsedMemoryRangeType::LowMemory, PhysicalAddress(0x00000000), PhysicalAddress(1 * MiB) }); global_data.used_memory_ranges.append(UsedMemoryRange { UsedMemoryRangeType::LowMemory, PhysicalAddress(0x00000000), PhysicalAddress(1 * MiB) });
#endif
global_data.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)).release_value_but_fixme_should_propagate_errors()) }); global_data.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)).release_value_but_fixme_should_propagate_errors()) });
if (multiboot_flags & 0x4) { if (multiboot_flags & 0x4) {