ABB E3ED  模拟控制站  自动化系统模块

The E3ED operating system has memory areas pinned (never swapped to secondary storage). Other terms used are locked, fixed; Constant, or wired, number of pages. For example, an interrupt mechanism relies on an array of Pointers to its handlers, such as input-output completion and page errors. If the pages containing these Pointers or the code they invoke are pageable, interrupt handling becomes more complex and time-consuming, especially in the case of page error interrupts. Therefore, some parts of the page table structure are not pageable.

E3ED Some pages may be fixed for a short time, some pages may be fixed for a long time, and some pages may need to be fixed permanently. For example:

The paging manager code and drivers for the secondary storage device where the page resides must be permanently fixed, or the paging will not even work because the necessary code is not available.

Timing dependent components can be fixed to avoid variable paging delays.

Data buffers are accessed directly by peripherals in use or I/O channels must reside on fixed pages because such devices and buses expect to find data buffers at physical memory addresses; If a page error occurs, the transmission cannot be stopped and then restarted after handling the page error, regardless of whether the bus has an input-output memory management unit. For example, data may come from a measurement sensor unit, and real-time data lost due to page errors cannot be recovered.

E3ED  在IBM的操作系统中系统/370和后继系统中，该术语是“固定的”，并且这样的页面可以是长期固定的，或者可以是短期固定的，或者可以是不固定的(即，可分页的)。系统控制结构通常是长期固定的(以挂钟时间计量，即以秒计量的时间，而不是以几分之一秒计量的时间)，而I/O缓冲器通常是短期固定的(通常以远小于挂钟的时间计量，可能是几十毫秒)。实际上，操作系统有一个特殊的功能来“快速修复”这些短期固定的数据缓冲区(修复是在不花费时间的情况下进行的管理程序调用指令).

E3ED  使用了“有线”这个术语。OpenVMS和Windows操作系统将临时变得不可分页的页面(如I/O缓冲区)称为“锁定的”，而将那些永远不可分页的页面简单地称为“不可分页的”。这单一UNIX规范还在规范中使用术语“锁定”姆洛克()，就像姆洛克() 手册页在许多方面类Unix系统。

BB O3EGb HENF315118R2
ABB E3EP HENF315276R1

ABB E3ED
ABB O3EHa HENF315087R2
ABB O3EC HENF442581R1
ABB P5EAa HENF206350R2
ABB G3ENa HENF450268R2
ABB INICT01 
ABB NTLS01  
ABB NTR002-A
ABB NIMP01
ABB IISAC01
ABB P3EB HENF315223R1
ABB O3EX HENF315845R2
ABB P3EDb HENF452778R1
ABB E3ES
ABB B3EA HENF315147R1
ABB P3EA HENF315216R1
ABB NWX511a-2/R HESG112548R12
ABB P3ECa HENF315309R2
ABB O3EId HENF452777R3
ABB E5EAA HENF105240R1
ABB B5EEd HENF105082R4
ABB G3EFa HENF450295R2
ABB G3EB HENF315768R1
ABB G3FK HENF452878R1
ABB G3FCb HENF458568R1
ABB E3EFa HENF452750R1
ABB B5EC HENF105077R1