JPS57100695A - Address check system for segment - Google Patents

Address check system for segment

Info

Publication number
JPS57100695A
JPS57100695A JP17532380A JP17532380A JPS57100695A JP S57100695 A JPS57100695 A JP S57100695A JP 17532380 A JP17532380 A JP 17532380A JP 17532380 A JP17532380 A JP 17532380A JP S57100695 A JPS57100695 A JP S57100695A
Authority
JP
Japan
Prior art keywords
address
check
access
segment
bit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP17532380A
Other languages
Japanese (ja)
Other versions
JPS6327736B2 (en
Inventor
Hideyasu Fukazawa
Yutaka Katsumata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Panafacom Ltd
Original Assignee
Fujitsu Ltd
Panafacom Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd, Panafacom Ltd filed Critical Fujitsu Ltd
Priority to JP17532380A priority Critical patent/JPS57100695A/en
Publication of JPS57100695A publication Critical patent/JPS57100695A/en
Publication of JPS6327736B2 publication Critical patent/JPS6327736B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Storage Device Security (AREA)

Abstract

PURPOSE:To decrease a frequency of a check on access unaddressed to a segment, by providing an address-check specifying bit in an instruction word and by performing checking operation only when the specifying bit is set. CONSTITUTION:During the generation of instruction words, the address-check specifying bit C of an addressing part INS is set to ''1'' for data access proved to require a check on its address in accessing. Then when the bit C is set to ''0'', the access is advanced by the starting address (a) of data to be accessed. When the bit C is set to ''1'', on the other hand, the address (a) generated by a comparing circuit CMP1 and the starting address (l) of a segment are compared mutually and when a<l, the access is considered to be impossible to generate an error signal. Further, the address (a) and the length L of data to be accessed are added together, and the sum and the ending address (u) of the segment are compared by a comparing circuit CMP2 and when a+L>u, the access is made to be impossible. Thus, the cases of the check is limited.
JP17532380A 1980-12-12 1980-12-12 Address check system for segment Granted JPS57100695A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17532380A JPS57100695A (en) 1980-12-12 1980-12-12 Address check system for segment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17532380A JPS57100695A (en) 1980-12-12 1980-12-12 Address check system for segment

Publications (2)

Publication Number Publication Date
JPS57100695A true JPS57100695A (en) 1982-06-22
JPS6327736B2 JPS6327736B2 (en) 1988-06-06

Family

ID=15994066

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17532380A Granted JPS57100695A (en) 1980-12-12 1980-12-12 Address check system for segment

Country Status (1)

Country Link
JP (1) JPS57100695A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298418A2 (en) * 1987-07-08 1989-01-11 Hitachi, Ltd. Virtual computer system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5423544A (en) * 1977-07-25 1979-02-22 Ricoh Co Ltd Dichromatic developing device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5423544A (en) * 1977-07-25 1979-02-22 Ricoh Co Ltd Dichromatic developing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0298418A2 (en) * 1987-07-08 1989-01-11 Hitachi, Ltd. Virtual computer system

Also Published As

Publication number Publication date
JPS6327736B2 (en) 1988-06-06

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