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Kernel: Make use of interrupts as an entropy source
Booting old computers without RDRAND/RDSEED and without a disk makes the system severely starved for entropy. Uses interrupts as a source to side-step that issue. Also warn whenever the system is starved of entropy, because that's a non-obvious failure mode.
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3 changed files with 16 additions and 2 deletions
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@ -44,6 +44,7 @@
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#include <Kernel/Interrupts/UnhandledInterruptHandler.h>
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#include <Kernel/KSyms.h>
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#include <Kernel/Process.h>
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#include <Kernel/Random.h>
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#include <Kernel/SpinLock.h>
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#include <Kernel/Thread.h>
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#include <Kernel/VM/MemoryManager.h>
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@ -58,6 +59,8 @@ static Descriptor s_idt[256];
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static GenericInterruptHandler* s_interrupt_handler[GENERIC_INTERRUPT_HANDLERS_COUNT];
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static EntropySource s_entropy_source_interrupts{EntropySource::Static::Interrupts};
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// The compiler can't see the calls to these functions inside assembly.
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// Declare them, to avoid dead code warnings.
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extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread);
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@ -709,6 +712,7 @@ void handle_interrupt(TrapFrame* trap)
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auto& regs = *trap->regs;
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ASSERT(regs.isr_number >= IRQ_VECTOR_BASE && regs.isr_number <= (IRQ_VECTOR_BASE + GENERIC_INTERRUPT_HANDLERS_COUNT));
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u8 irq = (u8)(regs.isr_number - 0x50);
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s_entropy_source_interrupts.add_random_event(irq);
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auto* handler = s_interrupt_handler[irq];
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ASSERT(handler);
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handler->increment_invoking_counter();
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