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• #8769 S_x96x_S addikt

  Új Válasz 2023-05-20 02:19:40 #8769

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  jön a kibelezett ( ~ leegyszerűsített ) X86 ISA

  X86-S ISA External Architectural Specification
  Envisioning a Simplified Intel Architecture
  https://www.intel.com/content/www/us/en/developer/articles/technical/envisioning-future-simplified-architecture.html

  "This whitepaper details the architectural enhancements and modifications that Intel is currently investigating for a 64-bit mode-only architecture referred to as x86S (for simplification). Intel is publishing this paper to solicit feedback from the ecosystem while exploring the benefits of extending the ISA transition to a 64-bit mode-only solution. "
  
  """
  What Would Be the Benefits of a 64-bit Mode-Only Architecture?
  A 64-bit mode-only architecture removes some older appendages of the architecture, reducing the overall complexity of the software and hardware architecture. By exploring a 64-bit mode-only architecture, other changes that are aligned with modern software deployment could be made. These changes include:
  
  - Using the simplified segmentation model of 64-bit for segmentation support for 32-bit applications, matching what modern operating systems already use.
  - Removing ring 1 and 2 (which are unused by modern software) and obsolete segmentation features like gates.
  - Removing 16-bit addressing support.
  - Eliminating support for ring 3 I/O port accesses.
  - Eliminating string port I/O, which supported an obsolete CPU-driven I/O model.
  - Limiting local interrupt controller (APIC) use to X2APIC and remove legacy 8259 support.
  """

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