Kernel: Store current processor pointer in IA32_GS_BASE

This allows easier access to processors fields

kernel/arch/x86_64/GDT.cpp

@@ -18,9 +18,6 @@ namespace Kernel
 		gdt->write_entry(0x20, 0x00000000, 0xFFFFF, 0xF2, 0xC); // user data
 		gdt->write_tss();
 
-		gdt->flush_gdt();
-		gdt->flush_tss();
-
 		return gdt;
 	}
 

kernel/arch/x86_64/IDT.cpp

@@ -356,7 +356,7 @@ done:
 
 	extern "C" void syscall_asm();
 
-	IDT* IDT::create()
+	IDT* IDT::create(bool is_bsb)
 	{
 		auto* idt = new IDT();
 		ASSERT(idt);
@@ -369,7 +369,7 @@ done:
 
 		// FIXME: distribute IRQs more evenly?
 #define X(num) idt->register_interrupt_handler(IRQ_VECTOR_BASE + num, irq ## num);
-		if (Processor::current_is_bsb())
+		if (is_bsb)
 		{
 			IRQ_LIST_X
 		}
@@ -377,18 +377,15 @@ done:
 
 		idt->register_syscall_handler(0x80, syscall_asm);
 
-		idt->flush();
-
 		return idt;
 	}
 
 	[[noreturn]] void IDT::force_triple_fault()
 	{
 		// load 0 sized IDT and trigger an interrupt to force triple fault
-		auto& processor = Processor::current();
-		processor.set_interrupt_state(InterruptState::Disabled);
-		processor.idt().m_idtr.size = 0;
-		processor.idt().flush();
+		Processor::set_interrupt_state(InterruptState::Disabled);
+		Processor::idt().m_idtr.size = 0;
+		Processor::idt().load();
 		asm volatile("int $0x00");
 		ASSERT_NOT_REACHED();
 	}

kernel/arch/x86_64/PageTable.cpp

@@ -312,7 +312,7 @@ namespace Kernel
 	{
 		SpinLockGuard _(m_lock);
 		asm volatile("movq %0, %%cr3" :: "r"(m_highest_paging_struct));
-		Processor::current().m_current_page_table = this;
+		Processor::set_current_page_table(this);
 	}
 
 	void PageTable::invalidate(vaddr_t vaddr)

kernel/arch/x86_64/boot.S

@@ -158,13 +158,6 @@ enable_sse:
 	movl %eax, %cr4
 	ret
 
-initialize_lapic_id:
-	movl $1, %eax
-	cpuid
-	shrl $24, %ebx
-	movw %bx, %gs
-	ret
-
 initialize_paging:
 	# enable PAE
 	movl %cr4, %ecx
@@ -198,7 +191,6 @@ _start:
 	movl %ebx, V2P(bootloader_info)
 
 	movl $V2P(boot_stack_top), %esp
-	call initialize_lapic_id
 
 	call check_requirements
 	call enable_sse
@@ -278,7 +270,6 @@ ap_protected_mode:
 
 	movl ap_stack_ptr, %esp
 	movb $1, V2P(g_ap_stack_loaded)
-	call V2P(initialize_lapic_id)
 
 	call V2P(enable_sse)