Trait x86_64::instructions::segmentation::Segment64[−][src]

pub trait Segment64: Segment {
    const BASE: Msr;

    fn read_base() -> VirtAddr;

    unsafe fn write_base(base: VirtAddr);
}
Expand description

An x86 segment which is actually used in 64-bit mode

While most segments are unused in 64-bit mode, the FS and GS segments are still partially used. Only the 64-bit segment base address is used, and this address can be set via the GDT, or by using the FSGSBASE instructions.

Associated Constants

MSR containing the segment base. This MSR can be used to set the base when CR4.FSGSBASE is not set.

Required methods

Reads the segment base address

Exceptions

If CR4.FSGSBASE is not set, this instruction will throw a #UD.

Writes the segment base address

Exceptions

If CR4.FSGSBASE is not set, this instruction will throw a #UD.

Safety

The caller must ensure that this write operation has no unsafe side effects, as the segment base address might be in use.

Implementors