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Kernel: Implement more x86_64 context switching functionality

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This commit is contained in:
Gunnar Beutner 2021-06-27 19:49:19 +02:00 • committed by Andreas Kling
parent 076692b1ef
commit 32840dfa17
8 changed files with 151 additions and 132 deletions
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16
Kernel/Scheduler.cpp
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@ -354,8 +354,13 @@ bool Scheduler::context_switch(Thread* thread)
from_thread->set_state(Thread::Runnable);
#ifdef LOG_EVERY_CONTEXT_SWITCH
# if ARCH(I386)
dbgln("Scheduler[{}]: {} -> {} [prio={}] {:04x}:{:08x}", Processor::id(), from_thread->tid().value(),
thread->tid().value(), thread->priority(), thread->regs().cs, thread->regs().eip);
# else
dbgln("Scheduler[{}]: {} -> {} [prio={}] {:04x}:{:16x}", Processor::id(), from_thread->tid().value(),
thread->tid().value(), thread->priority(), thread->regs().cs, thread->regs().rip);
# endif
#endif
}
@ -375,14 +380,19 @@ bool Scheduler::context_switch(Thread* thread)
enter_current(*from_thread, false);
VERIFY(thread == Thread::current());
#if ARCH(I386)
if (thread->process().is_user_process()) {
auto iopl = get_iopl_from_eflags(Thread::current()->get_register_dump_from_stack().eflags);
FlatPtr flags;
auto& regs = Thread::current()->get_register_dump_from_stack();
#if ARCH(I386)
flags = regs.eflags;
#else
flags = regs.rflags;
#endif
auto iopl = get_iopl_from_eflags(flags);
if (iopl != 0) {
PANIC("Switched to thread {} with non-zero IOPL={}", Thread::current()->tid().value(), iopl);
}
}
#endif
return true;
}