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英特尔:2023年架构白皮书(中译版)(46页).pdf

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1、 X86-S EXTERNAL ARCHITECTURAL SPECIFICATION Rev.1.0 April 2023 Document Number:351407-001 X86-S ISA External Architectural Specification Document Number 351407-001,Revision 1.0 2 Notice:This document contains information on products in the design phase of development.The information here is subject

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本文主要介绍了X86-S ISA的外部体系结构规范,这是一个针对老旧操作系统和执行模式进行精简的ISA。主要变化包括: 1. 移除32位内核模式,以及vm86模式。 2. 移除16位和32位保护模式。 3. 移除16位寻址和地址大小覆盖。 4. 移除固定MTRRs。 5. 移除用户级I/O和字符串I/O。 6. 移除CR0写透模式。 7. 移除CR0中的遗留FPU控制位。 8. 移除Ring 3中断标志控制。 9. 移除CR寄存器的访问指令。 10. 重新设计INIT/SIPI机制。 11. 添加在4级和5级页表之间切换的新机制。 12. 移除XAPIC,仅支持x2APIC。 13. 移除对8259APIC的支持。 14. 移除在EFER MSR中禁用NX或SYSCALL或长模式。 15. 移除#SS和#NP异常。 16. 支持段架构的子集,包括限制IDT事件传递、仅支持FS、GS基础和限制、不限制32位模式下的数据或代码获取、不检查CS、DS、ES、FS、GS的AR或不可用选择器等。 以上是X86-S ISA的主要变化,旨在为老旧操作系统和执行模式提供精简和现代化的ISA。
X86-S ISA如何简化操作系统架构? X86-S ISA如何处理16位地址模式? X86-S ISA如何改进中断和异常处理?
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