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Kernel: Add stubs for missing x86_64 functionality

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This adds just enough stubs to make the kernel compile on x86_64. Obviously
it won't do anything useful - in fact it won't even attempt to boot because
Multiboot doesn't support ELF64 binaries - but it gets those compiler errors
out of the way so more progress can be made getting all the missing
functionality in place.
This commit is contained in:
Gunnar Beutner 2021-06-23 21:54:41 +02:00 • committed by Andreas Kling
parent f2eb759901
commit 38fca26f54
21 changed files with 295 additions and 40 deletions
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9
Kernel/Arch/x86/x86_64/Processor.cpp
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@ -88,6 +88,7 @@ u32 Processor::init_context(Thread& thread, bool leave_crit)
// TODO: handle NT?
VERIFY((cpu_flags() & 0x24000) == 0); // Assume !(NT | VM)
#if 0
auto& tss = thread.tss();
bool return_to_user = (tss.cs & 3) != 0;
@ -116,7 +117,6 @@ u32 Processor::init_context(Thread& thread, bool leave_crit)
// However, the first step is to always start in kernel mode with thread_context_first_enter
RegisterState& iretframe = *reinterpret_cast<RegisterState*>(stack_top);
// FIXME: copy state to be recovered through TSS
TODO();
// make space for a trap frame
stack_top -= sizeof(TrapFrame);
@ -161,6 +161,9 @@ u32 Processor::init_context(Thread& thread, bool leave_crit)
tss.gs = GDT_SELECTOR_DATA0;
tss.ss = GDT_SELECTOR_DATA0;
tss.fs = GDT_SELECTOR_PROC;
#else
TODO();
#endif
return stack_top;
}
@ -202,11 +205,15 @@ UNMAP_AFTER_INIT void Processor::initialize_context_switching(Thread& initial_th
auto& tss = initial_thread.tss();
m_tss = tss;
#if 0
m_tss.esp0 = tss.esp0;
m_tss.ss0 = GDT_SELECTOR_DATA0;
// user mode needs to be able to switch to kernel mode:
m_tss.cs = m_tss.ds = m_tss.es = m_tss.gs = m_tss.ss = GDT_SELECTOR_CODE0 | 3;
m_tss.fs = GDT_SELECTOR_PROC | 3;
#else
TODO();
#endif
m_scheduler_initialized = true;