Circuit arrangement capable of quickly processing an interrupt in a virtual machine operated by a plurality of operating systems

• US 4,837,674 A
• Filed: 02/09/1987
• Issued: 06/06/1989
• Est. Priority Date: 02/10/1986
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Takane, Hisao
• Primary Examiner(s): Chan, Eddie P.
• Application Number:
  US07/012,162
• Time in Patent Office: 848 Days
• Field of Search: 364/200 MS File, 364/900 MS File
• US Class Current: 710/48
• CPC Class Codes: G06F 13/24 using interrupt G06F13/32 takes precedence

Abstract

In a virtual machine comprising a plurality of execution processing units (15a, 15b) which may be operated in compliance with individual operating systems, an interrupt request is delivered from an I/O interrupt start circuit (24) to all of the execution processing units to make a destination one (15a) of the execution processing units carry out an interrupt processing operation. When an undestined one (15b) of the execution processing units responds to the interrupt request, the undestined processing unit initializes or enables the interrupt processing operation of the destination processing unit by the use of an interrupt start circuit (28b). Interrupt information related to the interrupt request is sent from an I/O write-in circuit (23) to a first retaining area (21) and moved from the first retaining area to a second retaining area (22) through the undestined processing unit. The destination processing unit starts the interrupt processing operation by the use of the interrupt information.

Claims

1. A circuit arrangement for use in a virtual machine which comprises a main memory connected to an input/output device, and a plurality of execution processing units and which is operable in accordance with a plurality of operating systems, said circuit arrangement being responsive to an interrupt request which indicates an interrupt processing operation to be carried out in a preselected one of said execution processing units, wherein the circuit arrangement comprises:

first means included in said input/output device for supplying said interrupt request simultaneously to each of said execution processing units so that only a receivable one of said execution processing units responds to said interrupt request; and

second means included in each of said execution processing units and coupled to said main memory and interruption reception circuit of the other execution processing unit, said second means of said receivable processing unit cooperating with a control program in said main memory for generating an interrupt start signal for directly starting said interrupt processing operation in said preselected one of the execution processing units when said receivable one o the execution processing units is different from said preselected one of the execution processing units.

2. A circuit arrangement as claimed in claim 1, further comprising:

third means included in said input/output means for producing interrupt information related to said interrupt request;

said circuit arrangement comprising, in said main memory;

a first retaining area for storing said interrupt information as a first interrupt information signal on production of said interrupt request; and

a second retaining area coupled to said plurality of the execution processing units for storing said interrupt information as a second interrupt information signal through said receivable one of the execution processing units so as to transmit said second interrupt information signal to said preselected one of the execution processing units.

3. A circuit arrangement as claimed in claim 2, further comprising, in each of said execution processing units:

readout means for selectively reading said first and said second interrupt information signals out of said first and said second retaining areas, respectively; and

write-in means for writing the interrupt information into said second retaining area as said second interrupt information signal.

4. A method of carrying out an interrupt processing operation in a virtual machine which comprises a main memory connected to an input/output device, and a plurality of execution processing units and which is operable in accordance with a plurality of operating systems, said interrupt processing operation to be carried out in a preselected one of said execution processing units in response to an interrupt request, wherein the method comprises the steps of:

supplying said interrupt request from said input/output device simultaneously to each of said execution processing units so that only a receivable one of said execution processing units responds to said interrupt request;

in cooperation with a control program in said main memory, generating in said receivable one of said execution processing units an interrupt start signal;

transmitting said interrupt start signal directly to an interrupt reception circuit of said preselected one of said execution processing units without utilizing said input/output device; and

starting said interrupt processing operation in said preselected one of the execution processing by said preselected one of said execution processing units responding to said interrupt start signal.