RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 17:47:44 +00:00
Code Issues Activity Actions

Kernel: Forked children should inherit their RangeAllocator by copy.

Browse source 
Otherwise we'll start handing out addresses that are very likely already in
use by existing ranges.
This commit is contained in:
Andreas Kling 2019-05-22 13:24:28 +02:00
parent 8098d2e337
commit 7afc0fb9c8
5 changed files with 11 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

4
Kernel/VM/PageDirectory.cpp
View file

@ -12,8 +12,8 @@ PageDirectory::PageDirectory(PhysicalAddress paddr)
m_directory_page = PhysicalPage::create_eternal(paddr, true);
}
PageDirectory::PageDirectory()
: m_range_allocator(LinearAddress(userspace_range_base), kernelspace_range_base - userspace_range_base)
PageDirectory::PageDirectory(const RangeAllocator* parent_range_allocator)
: m_range_allocator(parent_range_allocator ? RangeAllocator(*parent_range_allocator) : RangeAllocator(LinearAddress(userspace_range_base), kernelspace_range_base - userspace_range_base))
{
MM.populate_page_directory(*this);
}

4
Kernel/VM/PageDirectory.h
View file

@ -9,7 +9,7 @@
class PageDirectory : public Retainable<PageDirectory> {
friend class MemoryManager;
public:
static Retained<PageDirectory> create_for_userspace() { return adopt(*new PageDirectory); }
static Retained<PageDirectory> create_for_userspace(const RangeAllocator* parent_range_allocator = nullptr) { return adopt(*new PageDirectory(parent_range_allocator)); }
static Retained<PageDirectory> create_at_fixed_address(PhysicalAddress paddr) { return adopt(*new PageDirectory(paddr)); }
~PageDirectory();
@ -21,7 +21,7 @@ public:
RangeAllocator& range_allocator() { return m_range_allocator; }
private:
PageDirectory();
explicit PageDirectory(const RangeAllocator* parent_range_allocator);
explicit PageDirectory(PhysicalAddress);
RangeAllocator m_range_allocator;

5
Kernel/VM/RangeAllocator.cpp
View file

@ -12,6 +12,11 @@ RangeAllocator::RangeAllocator(LinearAddress base, size_t size)
#endif
}
RangeAllocator::RangeAllocator(const RangeAllocator& parent_allocator)
: m_available_ranges(parent_allocator.m_available_ranges)
{
}
RangeAllocator::~RangeAllocator()
{
}

1
Kernel/VM/RangeAllocator.h
View file

@ -46,6 +46,7 @@ private:
class RangeAllocator {
public:
RangeAllocator(LinearAddress, size_t);
RangeAllocator(const RangeAllocator&);
~RangeAllocator();
Range allocate_anywhere(size_t);