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use structures::gdt::SegmentSelector;
pub unsafe fn set_cs(sel: SegmentSelector) {
#[cfg(target_arch="x86")]
#[inline(always)]
unsafe fn inner(sel: SegmentSelector) {
asm!("pushl $0; \
pushl $$1f; \
lretl; \
1:" :: "ri" (u64::from(sel.0)) : "rax" "memory");
}
#[cfg(target_arch="x86_64")]
#[inline(always)]
unsafe fn inner(sel: SegmentSelector) {
asm!("pushq $0; \
leaq 1f(%rip), %rax; \
pushq %rax; \
lretq; \
1:" :: "ri" (u64::from(sel.0)) : "rax" "memory");
}
inner(sel)
}
pub unsafe fn load_ss(sel: SegmentSelector) {
asm!("movw $0, %ss " :: "r" (sel.0) : "memory");
}
pub unsafe fn load_ds(sel: SegmentSelector) {
asm!("movw $0, %ds " :: "r" (sel.0) : "memory");
}
pub unsafe fn load_es(sel: SegmentSelector) {
asm!("movw $0, %es " :: "r" (sel.0) : "memory");
}
pub unsafe fn load_fs(sel: SegmentSelector) {
asm!("movw $0, %fs " :: "r" (sel.0) : "memory");
}
pub unsafe fn load_gs(sel: SegmentSelector) {
asm!("movw $0, %gs " :: "r" (sel.0) : "memory");
}
pub fn cs() -> SegmentSelector {
let segment: u16;
unsafe { asm!("mov %cs, $0" : "=r" (segment) ) };
SegmentSelector(segment)
}