10.3.8 seg.h: Segment descriptor data structure definitions and constants

   

SYNOPSIS

#include <oskit/x86/seg.h>

DESCRIPTION

XXX

struct x86_desc

  Normal segment descriptors.

struct x86_gate

  Trap, interrupt, and call gates.

struct pseudo_descriptor

  Used to load the IDT and GDT (and LDT).

sel_idx(sel)

  Converts the selector into an index in the descriptor table.

ISPL(s)

  Returns the selector's privilege level.

USERMODE(s, f)

 

KERNELMODE(s, f)

 

fill_descriptor(struct x86_desc *desc, unsigned base, unsigned limit, unsigned char access, unsigned char sizebits)

  Fill a segment descriptor.

fill_descriptor_base(struct x86_desc *desc, unsigned base)

  Set the base address in a segment descriptor.

fill_descriptor_limit(struct x86_desc *desc, unsigned limit)

  Set the limit in a segment descriptor.

fill_gate(struct x86_gate *gate, unsigned offset, unsigned short selector, unsigned char access, unsigned char word_count)

  Fill an x86 gate descriptor.

This header file is based on a file in CMU's Mach kernel.