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Kernel: Add x86_64 support for fork()

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This commit is contained in:
Gunnar Beutner 2021-06-29 02:56:07 +02:00 • committed by Andreas Kling
parent 811f9d562d
commit df9e73de25
4 changed files with 42 additions and 35 deletions
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17
Kernel/Arch/x86/common/Processor.cpp
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@ -39,6 +39,7 @@ Atomic<u32> Processor::s_idle_cpu_mask { 0 };
extern "C" void thread_context_first_enter(void);
extern "C" void exit_kernel_thread(void);
extern "C" void do_assume_context(Thread* thread, u32 flags);
// The compiler can't see the calls to these functions inside assembly.
// Declare them, to avoid dead code warnings.
@ -1233,4 +1234,20 @@ extern "C" FlatPtr do_init_context(Thread* thread, u32 flags)
#endif
return Processor::current().init_context(*thread, true);
}
void Processor::assume_context(Thread& thread, FlatPtr flags)
{
dbgln_if(CONTEXT_SWITCH_DEBUG, "Assume context for thread {} {}", VirtualAddress(&thread), thread);
VERIFY_INTERRUPTS_DISABLED();
Scheduler::prepare_after_exec();
// in_critical() should be 2 here. The critical section in Process::exec
// and then the scheduler lock
VERIFY(Processor::current().in_critical() == 2);
do_assume_context(&thread, flags);
VERIFY_NOT_REACHED();
}
}