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Kernel: Remove s_processor_lock by making s_processors statically sized
Currently in SMP mode we hard code support for up to only 8 processors. There is no reason for this to be a dynamic allocation that needs to be guarded by a spinlock. Instead use a Array<T* with inline storage of 8, allowing each processor to initialize it self in place, avoiding all the need for locks.
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1415b2cfc3
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2 changed files with 15 additions and 14 deletions
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@ -623,6 +623,11 @@ struct DeferredCallEntry {
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bool was_allocated;
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};
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class Processor;
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// Note: We only support processors at most at the moment,
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// so allocate 8 slots of inline capacity in the container.
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using ProcessorContainer = Array<Processor*, 8>;
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class Processor {
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friend class ProcessorInfo;
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@ -665,7 +670,7 @@ class Processor {
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void gdt_init();
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void write_raw_gdt_entry(u16 selector, u32 low, u32 high);
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void write_gdt_entry(u16 selector, Descriptor& descriptor);
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static Vector<Processor*>& processors();
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static ProcessorContainer& processors();
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static void smp_return_to_pool(ProcessorMessage& msg);
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static ProcessorMessage& smp_get_from_pool();
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@ -751,8 +756,10 @@ public:
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{
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auto& procs = processors();
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size_t count = procs.size();
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for (size_t i = 0; i < count; i++)
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callback(*procs[i]);
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for (size_t i = 0; i < count; i++) {
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if (procs[i] != nullptr)
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callback(*procs[i]);
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}
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return IterationDecision::Continue;
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}
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