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Kernel: Share the "return to ring 0/3 from signal" trampolines globally.

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Generate a special page containing the "return from signal" trampoline code
on startup and then route signalled threads to it. This avoids a page
allocation in every process that ever receives a signal.
This commit is contained in:
Andreas Kling 2019-07-19 17:01:16 +02:00
parent fdf931cfce
commit f8beb0f665
5 changed files with 36 additions and 21 deletions
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3
Kernel/VM/MemoryManager.h
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@ -70,7 +70,8 @@ public:
void map_for_kernel(VirtualAddress, PhysicalAddress);
RefPtr<Region> allocate_kernel_region(size_t, String&& name);
RefPtr<Region> allocate_kernel_region(size_t, const StringView& name, bool user_accessible = false);
RefPtr<Region> allocate_user_accessible_kernel_region(size_t, const StringView& name);
void map_region_at_address(PageDirectory&, Region&, VirtualAddress);
unsigned user_physical_pages() const { return m_user_physical_pages; }