GDT.inc

This file defines the structures, constants, and macros for the Global Descriptor Table, or GDT, and its selectors.

See Also

Boot.asm

Authors

Neil G. Dickson

Summary

GDT.inc	This file defines the structures, constants, and macros for the Global Descriptor Table, or GDT, and its selectors.
Constants
GDT Selector Constants	These constants define segment selectors into the GDT.
Macros
TSS_DESC	Define a qword of data containing a TSS descriptor.

Constants

GDT Selector Constants

These constants define segment selectors into the GDT.

SELECTOR_CORE_CODE	Core code segment selector
SELECTOR_CORE_DATA	Core data segment selector
SELECTOR_CORE_CALL_GATE	CoreCallGate selector
SELECTOR_THREAD_SCHEDULER_TSS	ThreadSchedulerTSS selector
SELECTOR_USER_CODE	Code segment selector for all applications
SELECTOR_USER_DATA	Data segment selector for all applications
SELECTOR_BOOT_TSS	Boot TSS selector (until Boot is unloaded)
SZ_STORED_GDT	Size of the initial GDT

Macros

TSS_DESC

Define a qword of data containing a TSS descriptor.

Parameters

address	the address of the TSS
privilege	the privilege level of the descriptor

GDT dq 0 ;NULL descriptor

INITIAL GLOBAL DESCRIPTOR TABLE

This file contains the bootstrap (including Master Boot Record) for PwnOS.

The Core of PwnOS (a.k.a.

Entry point into the Core from Libraries.

ThreadSchedulerTSS TSS32 <>

This is the special TSS32 of the ThreadScheduler task.

This segment contains the 1st-level bootstrap code of PwnOS