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| 型號(hào)： | 21086 |
| 英文描述： | SYSCALL and SYSRET Instruction Specification? 341KB (PDF) |
| 中文描述： | 系統(tǒng)調(diào)用和SYSRET指令規(guī)范？ 341KB（PDF格式） |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 341K |
| 代理商： | 21086 |
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21086C/0—May 1998
SYSCALL and SYSRET Instruction Specification
Audience
1
Application Note
SYSCALL and SYSRET
Instruction Specification
Audience
The SYSCALL and SYSRET instruction specification
application note is intended for operating system designers.
Overview
SYSCALL and SYSRET are instructions used for low-latency
system calls and returns in operating systems with a flat
memory model and no segmentation. These instructions have
been optimized by reducing the number of checks and memory
references that are normally made so that a call or return takes
less than one-fourth the number of internal clock cycles when
compared to the current CALL/RET instruction method.
Feature Detection
To use the SYSCALL/SYSRET instructions, the programmer
must determine if the processor supports them. The CPUID
instruction gives programmers the ability to determine the
presence of these instructions on the processor. Software must
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