JPS57103198A - Storage protection system - Google Patents

Storage protection system

Info

Publication number
JPS57103198A
JPS57103198A JP17878180A JP17878180A JPS57103198A JP S57103198 A JPS57103198 A JP S57103198A JP 17878180 A JP17878180 A JP 17878180A JP 17878180 A JP17878180 A JP 17878180A JP S57103198 A JPS57103198 A JP S57103198A
Authority
JP
Japan
Prior art keywords
key
main memory
memory
protection
psw3
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.)
Pending
Application number
JP17878180A
Other languages
Japanese (ja)
Inventor
Katsunobu Noda
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
Original Assignee
Fujitsu 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 filed Critical Fujitsu Ltd
Priority to JP17878180A priority Critical patent/JPS57103198A/en
Publication of JPS57103198A publication Critical patent/JPS57103198A/en
Pending legal-status Critical Current

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  • Storage Device Security (AREA)

Abstract

PURPOSE: To shorten access time by constituting the contents of a key memory, provided corresponding to each divided block of a main memory, by pieces of read and write protection information which correspond to the address of the main memory and the protection key of a program state word.
CONSTITUTION: In a system which protects a main memory 1 by key memories 2' provided corresponding to divided blocks of the main memory 1, the contents of each key memory 2' are constituted by pieces of read and write protection signals F' and S' which correspond to the address signal ADD of the main memory 1 and the protection key of a program state word PSW3. For access to the key memory 2', the address ADD of the main memory and the protection key of the PSW3 are used. Thus, it is unnecessary to compare key information read out of the memory 2' and the protection key of the PSW3 during access to the main memory, so the access time is shortened.
COPYRIGHT: (C)1982,JPO&Japio
JP17878180A 1980-12-19 1980-12-19 Storage protection system Pending JPS57103198A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17878180A JPS57103198A (en) 1980-12-19 1980-12-19 Storage protection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17878180A JPS57103198A (en) 1980-12-19 1980-12-19 Storage protection system

Publications (1)

Publication Number Publication Date
JPS57103198A true JPS57103198A (en) 1982-06-26

Family

ID=16054515

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17878180A Pending JPS57103198A (en) 1980-12-19 1980-12-19 Storage protection system

Country Status (1)

Country Link
JP (1) JPS57103198A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6197761A (en) * 1984-10-18 1986-05-16 Mitsubishi Electric Corp Memory protection system
JPS61147305A (en) * 1984-12-20 1986-07-05 Amada Metoretsukusu:Kk Program lock method of nc machine
JPS6252637A (en) * 1985-08-30 1987-03-07 アドバンスト・マイクロ・デイバイシズ・インコ−ポレ−テツド Digital processor control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6197761A (en) * 1984-10-18 1986-05-16 Mitsubishi Electric Corp Memory protection system
JPS61147305A (en) * 1984-12-20 1986-07-05 Amada Metoretsukusu:Kk Program lock method of nc machine
JPS6252637A (en) * 1985-08-30 1987-03-07 アドバンスト・マイクロ・デイバイシズ・インコ−ポレ−テツド Digital processor control

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