moon/src/arch/x86_64/cpu.rs

@@ -4,8 +4,6 @@
 use core::arch::x86_64::{__cpuid as do_cpuid, CpuidResult};
 use core::arch::asm;
 
-use super::gdt;
-
 fn safe_cpuid(leaf: u32) -> CpuidResult {
     return unsafe { do_cpuid(leaf) };
 }
@@ -24,18 +22,10 @@ pub fn halt() -> ! {
     }
 }
 
-pub fn wait_for_interrupt()
-{
+pub fn wait_for_interrupt() -> () {
     unsafe { asm!("hlt"); }
 }
 
-pub fn breakpoint()
-{
+pub fn breakpoint() -> () {
     unsafe { asm!("int3"); }
-}
-
-pub fn platform_init()
-{
-    gdt::init();
-    gdt::load_and_reload_segment_registers();
 }

moon/src/arch/x86_64/gdt.rs

@@ -1,35 +0,0 @@
-#![cfg(target_arch = "x86_64")]
-#![allow(dead_code)]
-
-use x86_64::structures::gdt::{Descriptor, GlobalDescriptorTable};
-use x86_64::registers::segmentation::{CS, SS, Segment, SegmentSelector};
-use x86_64::PrivilegeLevel;
-use spin::Mutex;
-
-static mut GDT: GlobalDescriptorTable = GlobalDescriptorTable::new();
-static GDT_LOCK: Mutex<u64> = Mutex::new(0); // we cannot lock the GDT directly as it must stay in the same place in memory and that behaves weirdly with mutexes
-
-fn add_entry(descriptor: Descriptor)
-{
-    GDT_LOCK.lock();
-    unsafe { GDT.add_entry(descriptor); }
-}
-
-pub fn init()
-{
-    add_entry(Descriptor::kernel_code_segment());
-    add_entry(Descriptor::kernel_data_segment());
-    add_entry(Descriptor::user_code_segment());
-    add_entry(Descriptor::user_data_segment());
-    // TODO: add a TSS.
-}
-
-pub fn load_and_reload_segment_registers()
-{
-    GDT_LOCK.lock();
-    unsafe { 
-        GDT.load();
-        CS::set_reg(SegmentSelector::new(1, PrivilegeLevel::Ring0));
-        SS::set_reg(SegmentSelector::new(2, PrivilegeLevel::Ring0));
-    }
-}

moon/src/arch/x86_64/mod.rs

@@ -1,5 +1,4 @@
 #![cfg(target_arch = "x86_64")]
 pub mod cpu;
 pub mod io;
-pub mod interrupts;
-mod gdt;
+pub mod interrupts;

moon/src/main.rs

@@ -25,8 +25,6 @@ pub extern "C" fn _start() -> ! {
     init::halt_other_cores();
     init::check_magic();
 
-    cpu::platform_init();
-
     interrupts::load();
 
     video::clear(Color::White);