Module gdt

Memory Segmentation

The GlobalDescriptorTable and its memory segment Descriptors primarely define continuous memory regions for different purposes. Examples of these memory regions are kernel code or kernel data segments. These segments might overlap and can be defined to span over the whole addressable memory.

Structs

• Descriptor
  Describes the structure of segment descriptors
• GlobalDescriptorTable
  Abstracts the GDT that, primarily, contains descriptors to memory segments.
• SegmentSelector
  Specifies which element to load into a segment from descriptor tables (i.e., is a index to LDT or GDT table with some additional flags).

Enums

• Ring
  Ring level

Functions

• code_segment
  Returns the current value of the code segment register.