Intel x86S Paves Way For 64-bit Only Architectures: Removing Legacy Modes & Simplifying Design
How Would a 64-Bit Mode-Only Architecture Work?
Intel® 64 architecture designs come out of reset in the same state as the original 8086 and require a series of code transitions to enter 64-bit mode. Once running, these modes are not used in modern applications or operating systems.
An exclusively 64-bit mode architecture will require 64-bit equivalents of technologies that currently run in either real mode or protected mode. For example:
Booting CPUs (SIPI) starts in real-address mode today and needs a 64-bit replacement. A direct 64-bit reset state eliminates the several stages of trampoline code to enter 64-bit operation.
Today, using 5-level pages requires disabling paging, which requires going back to unpaged legacy mode. In the proposed architecture, it is possible to switch to 5-level paging without leaving a paged mode.
These modifications can be implemented with straightforward enhancements to the system architecture affecting the operating system only.
Source: Wccftech
