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Kernel: Implement initializing threads on x86_64

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This commit is contained in:
Gunnar Beutner 2021-06-27 13:59:41 +02:00 • committed by Andreas Kling
parent f285241cb8
commit 9ed051fe25
5 changed files with 59 additions and 44 deletions
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21
Kernel/Arch/x86/i386/CPU.cpp
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@ -19,7 +19,6 @@ namespace Kernel {
// The compiler can't see the calls to these functions inside assembly.
// Declare them, to avoid dead code warnings.
extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread) __attribute__((used));
extern "C" void context_first_init(Thread* from_thread, Thread* to_thread, TrapFrame* trap) __attribute__((used));
extern "C" u32 do_init_context(Thread* thread, u32 flags) __attribute__((used));
extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread)
@ -73,26 +72,6 @@ extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread)
// TODO: ioperm?
}
extern "C" void context_first_init([[maybe_unused]] Thread* from_thread, [[maybe_unused]] Thread* to_thread, [[maybe_unused]] TrapFrame* trap)
{
VERIFY(!are_interrupts_enabled());
VERIFY(is_kernel_mode());
dbgln_if(CONTEXT_SWITCH_DEBUG, "switch_context <-- from {} {} to {} {} (context_first_init)", VirtualAddress(from_thread), *from_thread, VirtualAddress(to_thread), *to_thread);
VERIFY(to_thread == Thread::current());
Scheduler::enter_current(*from_thread, true);
// Since we got here and don't have Scheduler::context_switch in the
// call stack (because this is the first time we switched into this
// context), we need to notify the scheduler so that it can release
// the scheduler lock. We don't want to enable interrupts at this point
// as we're still in the middle of a context switch. Doing so could
// trigger a context switch within a context switch, leading to a crash.
Scheduler::leave_on_first_switch(trap->regs->eflags & ~0x200);
}
extern "C" u32 do_init_context(Thread* thread, u32 flags)
{
VERIFY_INTERRUPTS_DISABLED();