diff options
Diffstat (limited to 'src/dtables.rs')
| -rw-r--r-- | src/dtables.rs | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/dtables.rs b/src/dtables.rs index 780d6d4..d53113f 100644 --- a/src/dtables.rs +++ b/src/dtables.rs @@ -55,11 +55,17 @@ impl<T> fmt::Debug for DescriptorTablePointer<T> { } /// Load the GDTR register with the specified base and limit. +/// +/// # Safety +/// Needs CPL 0. pub unsafe fn lgdt<T>(gdt: &DescriptorTablePointer<T>) { llvm_asm!("lgdt ($0)" :: "r" (gdt) : "memory"); } /// Retrieve base and limit from the GDTR register. +/// +/// # Safety +/// Needs CPL 0. pub unsafe fn sgdt<T>(idt: &mut DescriptorTablePointer<T>) { llvm_asm!("sgdt ($0)" : "=r" (idt as *mut DescriptorTablePointer<T>) :: "memory"); } @@ -71,6 +77,9 @@ pub unsafe fn sgdt<T>(idt: &mut DescriptorTablePointer<T>) { /// the processor uses the segment selector to locate /// the segment descriptor for the LDT in the global /// descriptor table (GDT). +/// +/// # Safety +/// Needs CPL 0. pub unsafe fn load_ldtr(selector: SegmentSelector) { llvm_asm!("lldt $0" :: "r" (selector.bits()) : "memory"); } @@ -79,6 +88,9 @@ pub unsafe fn load_ldtr(selector: SegmentSelector) { /// /// The returned segment selector points to the segment descriptor /// (located in the GDT) for the current LDT. +/// +/// # Safety +/// Needs CPL 0. pub unsafe fn ldtr() -> SegmentSelector { let selector: u16; llvm_asm!("sldt $0" : "=r"(selector)); @@ -86,11 +98,17 @@ pub unsafe fn ldtr() -> SegmentSelector { } /// Load the IDTR register with the specified base and limit. +/// +/// # Safety +/// Needs CPL 0. pub unsafe fn lidt<T>(idt: &DescriptorTablePointer<T>) { llvm_asm!("lidt ($0)" :: "r" (idt) : "memory"); } /// Retrieve base and limit from the IDTR register. +/// +/// # Safety +/// Needs CPL 0. pub unsafe fn sidt<T>(idt: &mut DescriptorTablePointer<T>) { llvm_asm!("sidt ($0)" : "=r" (idt as *mut DescriptorTablePointer<T>) :: "memory"); } |