callgate_descriptor_s Struct Reference

A callgate descriptor for the GDT/LDT Intel 64 and IA-32 Architectures Software Developer's Manual - Vol. 3a - Sec. 5.8.3 and Fig. 5.8. More...

#include <gdt.h>

Data Fields
unsigned	offset_low: 16
	Lower bits of the entrypoint offset in segment (15..0) More...
unsigned	segment: 16
	Code segment to be accessed. More...
unsigned	args: 5
	Number of parameters to be copied between stacks if a task switch occurs. More...
unsigned	reserved: 3
	always zero smh More...
unsigned	type: 4
	Use GDT_CALLGATE_TYPE macro. More...
unsigned	zero: 1
	always zero smh More...
unsigned	dpl: 2
	Descriptor Privilege Level. More...
unsigned	present: 1
	Present flag (validity of the callgate) More...
unsigned	offset_high: 16
	Higher bits of the entrypoint offset in segment (31..16) More...

Detailed Description

A callgate descriptor for the GDT/LDT Intel 64 and IA-32 Architectures Software Developer's Manual - Vol. 3a - Sec. 5.8.3 and Fig. 5.8.

Field Documentation

args

unsigned callgate_descriptor_s::args

Number of parameters to be copied between stacks if a task switch occurs.

dpl

unsigned callgate_descriptor_s::dpl

Descriptor Privilege Level.

offset_high

unsigned callgate_descriptor_s::offset_high

Higher bits of the entrypoint offset in segment (31..16)

offset_low

unsigned callgate_descriptor_s::offset_low

Lower bits of the entrypoint offset in segment (15..0)

present

unsigned callgate_descriptor_s::present

Present flag (validity of the callgate)

reserved

unsigned callgate_descriptor_s::reserved

always zero smh

segment

unsigned callgate_descriptor_s::segment

Code segment to be accessed.

type

unsigned callgate_descriptor_s::type

Use GDT_CALLGATE_TYPE macro.

zero

unsigned callgate_descriptor_s::zero

always zero smh

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The documentation for this struct was generated from the following file:

• gdt.h