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
.
unsafe fn write_base(base: VirtAddr)
unsafe fn write_base(base: VirtAddr)
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.