RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 11:48:10 +00:00
Code Issues Activity Actions

Kernel: Remove i686 support

Browse source
This commit is contained in:
Liav A 2022-10-04 03:05:54 +03:00 • committed by Andreas Kling
parent 32270dcd20
commit 5ff318cf3a
75 changed files with 142 additions and 895 deletions
Download patch file Download diff file Expand all files Collapse all files

20
Kernel/Memory/RegionTree.cpp
View file

@ -121,26 +121,6 @@ ErrorOr<VirtualRange> RegionTree::allocate_range_randomized(size_t size, size_t
if (!m_total_range.contains(random_address, size))
continue;
#if ARCH(I386)
// Attempt to limit the amount of wasted address space on platforms with small address sizes (read: i686).
// This works by only allowing arbitrary random allocations until a certain threshold, to create more possibilities for placing mappings.
// After the threshold has been reached, new allocations can only be placed randomly within a certain range from the adjacent allocations.
VirtualAddress random_address_end { random_address.get() + size };
constexpr size_t max_allocations_until_limited = 200;
constexpr size_t max_space_between_allocations = 1 * MiB;
if (m_regions.size() >= max_allocations_until_limited) {
auto* lower_allocation = m_regions.find_largest_not_above(random_address.get());
auto* upper_allocation = m_regions.find_smallest_not_below(random_address_end.get());
bool lower_in_range = (!lower_allocation || random_address - lower_allocation->range().end() <= VirtualAddress(max_space_between_allocations));
bool upper_in_range = (!upper_allocation || upper_allocation->range().base() - random_address_end <= VirtualAddress(max_space_between_allocations));
if (!upper_in_range && !lower_in_range)
continue;
}
#endif
auto range_or_error = allocate_range_specific(random_address, size);
if (!range_or_error.is_error())
return range_or_error.release_value();