JP3033713B2 - Virtual machine emulation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a virtual machine emulator, and more particularly, to a virtual machine emulator that maintains compatibility in displaying application programs among a plurality of different models having different architectures in computers such as personal computers and workstations. It relates to a rate device.

[0002]

2. Description of the Related Art Conventionally, many different architectures exist for computers such as personal computers. The architecture referred to here is an OS function, a BIOS function, a memory map, an I / O map, an interrupt level, a used LSI, and the like.

As described above, if the software and hardware architectures differ between models, a program developed on a certain architecture, for example, application software (hereinafter abbreviated as AP) cannot operate on a different architecture. is there. In other words, there is no program compatibility between models of different architectures.

[0004] In order to solve this problem, there is a method of maintaining compatibility by emulating one architecture (hereinafter, referred to as a target machine) on another architecture (hereinafter, referred to as a base machine).

[0005] Such emulation methods are roughly classified into the following two types depending on the position of an emulation device for emulating.

In the first method, an emulation device for emulating a BIOS function, an I / O input / output instruction, and a memory map of a base machine is prepared, and the emulation device is mounted on hardware of the base machine. This is a system that enables the OS, driver, and AP for a machine to operate. In this case OS for base machine
And drivers are not used.

If the AP side for the target machine is defined as the world of the target machine and the hardware side of the base machine is defined as the world of the base machine based on the emulation apparatus, the first method is that the hardware and BI are included in the world of the base machine.
Only OS, BIOS function call, I / O
Since the software (AP, OS, driver) for executing input / output instructions and memory access is all in the world of the target machine, it has the advantage that all functions can be easily emulated. On the other hand, cost issues for the user that the user must purchase a new OS and driver for the target machine and OS functions that the software in the world of the target machine tries to execute are also emulated. Therefore, there is a disadvantage that the processing speed is reduced.

In the second method, an emulation device for emulating an OS function using the base machine OS in addition to the first method is provided on the base machine, the base machine OS, and the base machine driver. The emulation of the BIOS function, I / O input / output instruction, and memory map is the same as that of the first method.
Function emulation emulates functions with differences between the base machine OS and the target machine OS using the base machine OS and the base machine driver, and in the case of equivalent functions, controls the base machine OS. This is the method of transition.

The second method is low in cost because the OS and driver for the base machine already owned by the user are diverted, and high in emulation because the OS operates in the base machine world. There is an advantage that performance can be expected. On the other hand, since the OS and the driver are located in the world of the base machine and the control performed by the OS and the driver cannot be recognized by the emulation device, there is a disadvantage that the emulatable range is narrowed.

The method disclosed in Japanese Patent Application Laid-Open No. 8-153007 discloses a method in which a BIOS function call for screen display, an I / O input / output instruction, and a memory access to a VRAM are issued from an AP for a target machine.
By emulating them individually and developing them into a virtual VRAM prepared on the memory, converting them to the real VRAM of the base machine at the timing created by timer emulation, etc., and writing them, the screen from the AP for the target machine is used. This is a technology that enables display on a base machine, and emulates display control hardware of a base machine to display control hardware of a target machine.

[0011] In the emulation system,
Changes in the color palette are described in 11 and 12, and the parameter settings of the screen control hardware of the base machine are changed and used.

[0012]

As described above, Japanese Unexamined Patent Application Publication No.
In the conventional emulation method described in 153007,
The parameter settings of the display control hardware of the base machine have been changed.

For this reason, in the case of the second emulation method in which the OS function is emulated by using the OS and the driver for the base machine, the AP for the target machine issues the OS function of the base machine. In this case, the emulator transfers control to the OS and driver for the base machine, and
S, driver, and BIOS are no longer involved. Therefore, for example, if the OS function is a function related to the screen operation, the display BIOS performs processing without recognizing that the setting of the parameter of the screen control hardware of the base machine has been changed. This will result in an incorrect display.

[0014] In addition to the OS function issued from the target machine AP, there is a drawback that the same illegal display occurs when the base machine OS displays a screen due to an error display or the like.

An object of the present invention is to provide an AP for a target machine.
Another object of the present invention is to provide a virtual machine emulator capable of correctly displaying not only a screen display from the OS but also a screen display from a base machine OS and a driver at the same time.

[0016]

According to a first aspect of the present invention, there is provided a virtual machine emulator which converts application software for a target machine operating on one computer (hereinafter referred to as a target machine) between computers having different architectures from each other. (Hereinafter referred to as a base machine), a screen display from the target machine application software is placed in a virtual target VRAM via a text emulator and a graphic emulator, and the target machine VR is displayed.
A virtual machine that emulates by converting AM information into VRAM information for a base machine and emulates emulation other than the screen display by using an OS, a BIOS, a driver, and peripheral I / O hardware of the base machine. In the emulator, a text-based screen emulation means for converting an instruction to a display system BIOS of the base machine into a display format on the target machine and supplying the display format to the text emulator; And an emulator transfer means for transferring a command to the display BIOS of the base machine to the text-based screen emulation means.

A virtual machine emulator according to a second aspect of the present invention is a virtual machine emulator which uses a target machine application software operating on one computer (hereinafter referred to as a target machine) between computers having different architectures. Screen display from the target machine application software via a text emulator and a graphic emulator.
The emulation is performed by converting the VRAM information for the target machine into the VRAM information for the base machine in the AM, and the emulation other than the screen display is performed by using the OS, the BIOS, the driver, and the peripheral I / O hardware of the base machine. A virtual machine emulation device for performing emulation by using a display system BIOS of the base machine.
Screen emulation means for converting the command to the display format on the target machine and supplying it to the text emulator and the graphic emulator, and an instruction from the OS and / or driver of the base machine to the display system BIOS of the base machine. Emulator transfer means for transferring the data to the base screen emulation means.

The virtual machine emulation device of the third invention, in the virtual machine emulation apparatus of the second aspect of the invention, the base screen emulation means, said target text relationship instruction to the display system BIOS of the base machine Text-based screen emulation means for converting the display format on a machine and supplying the text emulator to the text emulator; and a graphic for converting a graphic-related instruction to a display system BIOS of the base machine into a display format on the target machine and supplying the graphic-based emulator And a base screen emulation means.

[0019]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a system configuration when emulating using the first embodiment of the virtual machine emulator 1 of the present invention.

The emulation system shown in FIG.
A virtual machine emulator 1 according to the first embodiment;
A for target machine developed for target machine
P12, a base machine OS 13 prepared for the base machine, a base machine driver 14 for controlling extended peripheral devices of the base machine, and a base machine BIOS
15 and peripheral I / O hardware for the base machine, which is I / O hardware excluding the display system of the base machine 16
And a base machine VRAM 17 which is a display I / O hardware of the base machine, and a base machine CRT controller 18.

The virtual machine emulator 1 includes an initialization section 2, a control interrupt reception section 3, an S / W interrupt emulation section 4, an exception interruption release / return section 5, and a graphic emulator (hereinafter referred to as GEM). 6), a text emulator (hereinafter, referred to as TEM) 7, a display emulator (hereinafter, referred to as DEM) 8, a virtual target VRAM 9, an emulator transfer unit 10, and a text-based screen emulator 11. Have been.

The initialization unit 2 performs initialization when the virtual machine emulation device 1 is started. In particular,
Setting exceptions for I / O input / output instructions, setting exceptions for S / W interrupt instructions, setting exceptions for interrupt vector tables, BIOS
The setting of the exception of the data area, the setting of the control interrupt receiving unit 3, and the like are performed.

The control interrupt receiving unit 3 is provided when the target machine AP 12 issues a function call or an I / O input / output instruction based on an S / W interrupt instruction, or when an interrupt vector table or a BIOS data area on a memory is issued. , An exception interrupt generated when a memory access instruction is executed is accepted, the exception generating instruction is analyzed, and necessary emulation processing is read.

The S / W interrupt emulation 4 is such that in response to a function call issued by the target machine AP 12 in response to the S / W interrupt command,
If the function is an IOS function, the BIOS is emulated. If the function is an OS function, it is determined whether or not the function is a difference function between the OS for the target machine and the OS 13 for the base machine. In this case, if it is a differential function, the base machine OS 13 or the base machine BI
Emulation is performed using the OS 15, and if the function is the same as that of the base machine OS 13, the control is passed to the base machine OS 13.

The exception interrupt release / return unit 5 converts the S / W interrupt emulation 4 to the base machine OS 13 or the base machine driver 14 or the base machine BIOS 1
5 when transferring control to the base machine OS 13 and the base machine driver 14 or the base machine B
In order to prevent the occurrence of an exception interrupt due to a function call, an I / O input / output instruction, or a memory access instruction due to an S / W interrupt instruction executed in the IOS 15 and to prevent the control from being transferred to the virtual machine emulator 1 again. The setting of the exception is canceled before the control is passed, and the setting of the exception is restored after the processing is completed.

The GEM 6 includes an I / O input / output instruction for displaying a graph and a graph VRA for the target machine AP 12 and the like.
When an attempt is made to execute a memory access instruction to M, this I / O input / output instruction is converted into an I / O input / output instruction to the base machine CRT controller 18, and the memory access instruction is used for memory access to the virtual target VRAM 9. Convert.

The TEM 7 is an I / O input / output instruction for text display and a text V
When trying to execute a memory access instruction to RAM,
This I / O input / output instruction is converted into an I / O input / output instruction to the base machine CRT controller 18, and the memory access instruction is converted into a memory access to the virtual target VRAM 9.

The DEM 8 converts the screen display contents from the target machine AP 12 written in the virtual target VRAM 9 to the base machine VRAM 17 and the base machine CRT controller 18 and outputs the same to the real screen.

The virtual target VRAM 9 prepares a memory area corresponding to the VRAM for the target machine other than the VRAM 17 for the base machine.
Once the display contents from 2 etc. are
The contents are stored in the RAM notation, and the contents are converted and output to the base machine VRAM 17 and the base machine CRT controller 17 by the DEM 8.

The emulator transfer section 10 includes a base machine OS 13 and a base machine driver 14.
OS1 for base machine located in memory area below MB
When calling the base system display BIOS from the base machine driver 3 or the base machine driver 14, the text-based screen emulation 11 in the virtual machine emulation device 1 placed in the memory area above 1 MB is executed by the S / W interrupt instruction. Call using.

The text-based screen emulation 11
The function call emulated by the emulator transfer unit 10 from the base machine OS 13 or the base machine driver 14 to the base machine display system BIOS is emulated, and the TEM 7 is read out to write in the virtual target VRAM 9.

The operation of the virtual machine emulator 1 according to the first embodiment will be described below in detail with reference to the drawings.

The virtual machine emulator 1 has a CPU
, An I / O input / output instruction, a memory access instruction, and a S / W interrupt instruction issued by the target machine AP 12 are detected using the exceptional interrupt by the protection function of the target machine. This is achieved by emulating.

FIG. 2 is a flowchart showing the operation of the initialization unit 2.

When the virtual machine emulator 1 is started, exceptions are set for I / O input / output instructions, S / W interrupt instructions, and memory access instructions (step 21), and are set in the base machine interrupt vector table. The emulator transfer unit 10 for reading the text-based screen emulation 11 in the virtual machine emulation device 1 is set instead of the base machine display system BIOS (step 2).
2).

FIG. 3 is a memory map in a state where the initialization unit 2 has been completed and the target machine AP has been read into the memory. Here, in the physical memory map 30, the base machine interrupt vector table 31 and the base machine B
An IOS data area 32, a base machine OS 13,
A base machine driver 14, an emulator transfer unit 10 which is a part of the virtual machine emulator 1, a target machine AP 12, and a base machine VRAM 1
7, the base machine BIOS 15, and the virtual machine emulation device 1.

Further, the virtual machine emulator 1 includes a target machine interrupt vector table 33, a target machine BIOS data area 34, a control interrupt accepting unit 3, an S / W interrupt emulator 4, an exception Interrupt release / return unit 5 and text-based screen emulation 11
, GEM 6, TEM 7, DEM 8, virtual target VRAM 9, and initialization unit 2.

As shown in this memory map, the virtual machine emulator 1 is located in a memory area above 1 MB, and 1 MB on which the target machine AP 12 operates.
In the following memory areas, the environment of the base machine is the same as that of the base machine except for the emulator transfer unit 10.
3 and base machine driver 14 and base machine BI
While the operating state of the OS 15 is maintained, the function call of the OS or BIOS executed by the target machine AP 12, the I / O input / output instruction, and the memory access instruction are emulated on the virtual machine emulator 1.

FIG. 4 is a diagram showing an emulation operation when an I / O input / output instruction from the target machine AP 12 to the target machine CRT controller or a memory access instruction to the target machine VRAM is issued. is there.

When an I / O input / output instruction from the target machine AP 12 to the CRT controller is to be issued, an exception interrupt occurs and the control interrupt receiving unit 3 is activated.
I / O to graphic screen CRT controller
If the instruction is an input / output instruction, the GEM 6 is activated and emulated as an I / O input / output instruction to the base machine CRT controller 18 or an update to the virtual target VRAM 9.

CRT for text screen in control interrupt receiving unit 3
If it is determined that the instruction is an I / O input / output instruction to the controller, the TEM 7 is activated and the I / O input / output instruction to the base machine CRT controller 18 or the virtual target V
This is emulated by updating to the RAM 9.

When a memory access instruction from the target machine AP 12 to the target machine VRAM is to be issued, an exception interrupt occurs, the control interrupt receiving unit 3 is activated, and the memory access instruction to the graphic screen VRAM is issued. If so, the GEM 6 is activated and emulated to update the virtual target VRAM 9.

In the control interrupt receiving unit 3, the VRA for the text screen
If it is determined that the instruction is a memory access instruction for M, TE
M7 is activated and emulated to update the virtual target VRAM9.

As described above, the virtual target VRAM
VRAM for target machine created on 9 is DE
The data is converted and output to the base machine VRAM 17 and the base machine CRT controller 18 by M8.

FIG. 5 is a diagram showing an emulation operation when a function call is issued from the target machine AP 12 to the target system screen BIOS by an S / W interrupt instruction.

Screen system B from target machine AP 12
When an S / W interrupt instruction is to be executed as a function call to the IOS, an exception interrupt is generated, the control interrupt receiving unit 3 is started, and it is determined that an exception interrupt has occurred to the S / W interrupt instruction. The S / W interrupt emulation 4 is activated. Here, if it is determined that the call is a function call to the graphic BIOS, the GEM 6 is activated and emulated as an I / O input / output instruction to the base machine CRT controller 18 or an update to the virtual target VRAM 9, and If it is determined in S / W interrupt emulation 4 that the call is a function call to Dext BIOS, TEM 7 is started and the base machine CR is activated.
This is emulated by an I / O input / output instruction to the T controller 18 or an update to the virtual target VRAM 9.

As described above, the virtual target VRAM
VRAM for target machine created on 9 is DE
The data is converted and output to the base machine VRAM 17 and the base machine CRT controller 18 by M8.

FIG. 6 shows an emulation operation when a function call is issued from the target machine AP 12 to a BIOS other than the screen BIOS for the target machine by an S / W interrupt command.

When an S / W interrupt instruction is to be executed as a function call from the target machine AP 12 to a BIOS other than the screen system, an exceptional interrupt occurs and the control interrupt receiving unit 3 is activated. It is determined that the interrupt is for the / W interrupt instruction, and the S / W interrupt emulation 4 is activated.

In the S / W interrupt emulation 4, the function for completing the emulation only in the S / W interrupt emulation 4 and the base machine OS 13, the base machine driver 14, and the base machine BIOS 15 are used. Emulation is divided into functions.

When the emulation is completed in the S / W interrupt emulation 4, the emulation is performed as it is.

However, in the case of a function that is emulated by using the base machine OS 13, base machine driver 14, and base machine BIOS 15, processing by the base machine OS 13, base machine driver 14, and base machine BIOS 15 is performed. Set the exception interrupt release / return unit 5 so as not to generate an exception interrupt so that the S / W interrupt instruction, I / O input / output instruction or memory access instruction used does not cause an exception interrupt. O for base machine
In step S13, the base machine driver 14 and the base machine BIOS 15 are read out, and before returning to the S / W interrupt emulation 4 again, the exception interrupt release / return unit 5 is set to generate an exception interrupt.

FIG. 7 shows the emulation of the S / W interrupt instruction from the target machine AP 12 and the base machine OS 1
3 is a diagram illustrating an operation when a function call is issued from the base machine OS 13 or the base machine driver 14 to the display BIOS of the base machine when the base machine driver 13 or the base machine driver 14 is used. .

When an OS function or a BIOS function is issued from the target machine AP 12 by an S / W interrupt command and emulation is performed using the base machine OS 13 or the base machine driver 14, the base machine When the OS 13 or the base machine driver 14 tries to display the screen and calls the base machine display system BIOS, the control is transferred to the emulator transfer unit 10 set in step 22 of the initialization unit 2.

The emulator transfer unit 10 is used to emulate the text-based screen emulation 1 in the virtual machine emulator 1.
Issue a S / W interrupt instruction to call 1. When the emulator transfer unit 10 issues an S / W interrupt command, the control interrupt receiving unit 3 in the virtual machine emulation device 1 is called, and the control interrupt receiving unit 3 performs S / W to the text-based screen emulation 11. It is determined that the instruction is an interrupt instruction, and the text-based screen emulation 11 is activated.

The text-based screen emulation 11 is executed by the base machine OS 13 or the base machine driver 1.
4 emulates the function to the screen BIOS for the base machine issued to the display format on the target machine, and updates the virtual target VRAM 9 from the TEM 7 or the I / O to the CRT controller for the base machine.
Execute as O input / output instruction, AP1 for target machine
Superimpose on the screen display from 2.

As described above, the virtual target VRAM
VRAM for target machine created on 9 is DE
The data is converted and output to the base machine VRAM 17 and the base machine CRT controller 18 by M8.

As described above, the virtual machine emulator according to the first embodiment can be used in the case of an OS function related to a screen operation issued from the target machine AP, and can also be executed by the base machine OS and driver. In the case of screen display, the virtual target VR is passed through the emulator transfer unit and text-based screen emulation.
This is reflected on the AM, so that it can be correctly displayed simultaneously with the screen display from the target machine AP.

The screen display from the normal OS and the driver is generally character display, and graphic display is not performed in many cases. Therefore, in the virtual machine emulation apparatus of the first embodiment, the base machine OS and the base machine OS For screen display from the base machine driver, emulation was performed using only the TEM 7 for text display, but the present invention is not limited to this.

Next, a virtual machine emulator according to a second embodiment of the present invention will be described with reference to the drawings.

FIG. 8 shows the configuration of a virtual machine emulator 100 according to the second embodiment of this invention. As shown in FIG. 8, the configuration of the virtual machine emulator 1 according to the first embodiment is different from that of the first embodiment in an emulator transfer unit 20 and a graphic base screen emulation 19. The difference will be described below.

The emulator transfer unit 20 stores the OS 13 for the base machine and the driver 14 for the base machine.
OS1 for base machine located in memory area below MB
When calling the base system display BIOS from the base machine driver 3 or the base machine driver 14, the text-based screen emulation 11 in the virtual machine emulation device 1 placed in the memory area above 1 MB is executed by the S / W interrupt instruction. The function to be used and called is the same as that of the emulator transfer unit 10 of the virtual machine emulator 1 of the first embodiment. It also has a function of calling the graphic base screen emulation 19 using an S / W interrupt command.

Graphic base screen emulation 19
Emulates a function call to the display system BIOS for the base machine from the base machine OS 13 or the base machine driver 14 transferred by the emulator transfer unit 20, reads the GEM 8, and writes the GEM 8 to the virtual target VRAM 9.

At the time of initialization, the initialization section 2 replaces the base machine display system BIOS set in the base machine interrupt vector table with the emulator transfer section 20.
Set.

As a memory map of FIG. 3 corresponding to the second embodiment, an emulator transfer unit 20 in place of the emulator transfer unit 10 is provided in addition to the text-based screen emulation 11 and the graphic-based screen emulation 19 are accommodated.

Operation when an I / O input / output instruction from the target machine AP shown in FIG. 4 to the target machine CRT controller or a memory access instruction to the target machine VRAM is issued, the target shown in FIG. Screen BI for target machine to AP for machine
Operation when a function call is issued by an S / W interrupt command to the OS, and a BIOS other than the target machine screen BIOS from the target machine AP shown in FIG.
For each operation when a function call is issued by an S / W interrupt instruction to the OS, the virtual machine emulation device 100 of the second embodiment and the virtual machine emulation device of the first embodiment The description is omitted because it is the same as the device 1.

When the OS for the base machine or the driver for the base machine is used by the emulation of the S / W interrupt instruction from the AP for the target machine in the virtual machine emulator of the second embodiment, FIG. 9 is a flowchart showing an operation when a function call is issued from the OS or the base machine driver to the base machine display system BIOS.

When the OS function or the BIOS function is issued from the target machine AP 12 by the S / W interrupt command and the emulation is performed by using the base machine OS 13 or the base machine driver 14, the base machine When the OS 13 or the base machine driver 14 attempts to display the screen and calls the base machine display system BIOS, the control is transferred to the emulator transfer unit 20 set in step 22 of the initialization unit 2.

The emulator transfer unit 20 calls the text-based screen emulation 11 in the virtual machine emulation apparatus 100 according to whether the above-described calling of the base machine display system BIOS is a text display or a graphic display. S / W to call W interrupt instruction or graphic base screen emulation 19
Issues an interrupt instruction. Emulator transfer unit 20 is S / W
When the interrupt command is issued, the control interrupt receiving unit 3 in the virtual machine emulator 1 is called, and the control interrupt receiving unit 3 determines that the command is an S / W interrupt command to the text-based screen emulation 11. In this case, the text-based screen emulation 11 is activated, and when it is determined that the instruction is an S / W interrupt command to the graphic-based screen emulation 19, the graphics-based screen emulation 19 is activated.

The text-based screen emulation 11 is the OS 13 for the base machine or the driver 1 for the base machine.
4 emulates the function to the screen BIOS for the base machine issued to the display format on the target machine, and updates the virtual target VRAM 9 from the TEM 7 or the I / O to the CRT controller for the base machine.
Execute as O input / output instruction, AP1 for target machine
Superimpose on the screen display from 2.

Graphic base screen emulation 19
Emulates the function to the screen BIOS for the base machine issued by the base machine OS 13 or the base machine driver 14 into a display format on the target machine, and the virtual target VRAM 9 by the GEM 6.
To the target machine or executed as an I / O input / output instruction to the CRT controller for the base machine.
Superimpose on the screen display from P12.

As described above, the virtual target VRAM
VRAM for target machine created on 9 is DE
The data is converted and output to the base machine VRAM 17 and the base machine CRT controller 18 by M8.

As described above, the virtual machine emulator according to the second embodiment can be used in the case of an OS function related to a screen operation issued from an AP for a target machine, and also in response to an OS function and a driver from a base machine. In the case of screen display as well, the virtual target VRAM is reflected through the emulator transfer unit, text-based screen emulation, and graphic-based screen emulation, and the graphic and text are simultaneously displayed together with the screen display from the target machine AP. It can be displayed correctly.

[0075]

As described above, the virtual machine emulation apparatus of the present invention can be used in the case of an OS function related to a screen operation issued from an AP for a target machine, as well as a screen from an OS and a driver for a base machine. In the case of display, the virtual target VR is also passed through an emulator transfer unit, text-based screen emulation, etc.
This is reflected on the AM, which has the effect that the information can be displayed simultaneously and correctly with the screen display from the target machine AP.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a virtual machine emulator according to the present invention.

FIG. 2 is a flowchart illustrating an example of an operation of an initialization unit according to the first embodiment.

FIG. 3 is a memory map diagram in a state where an AP for a target machine according to the first embodiment is read into a memory;

FIG. 4 is a flowchart showing an operation when an I / O input / output instruction from a target machine AP to a target machine CRT controller or a memory access instruction to a target machine VRAM is issued.

FIG. 5 is a difference diagram showing an operation when a function call is issued by an S / W interrupt command from the target machine AP to the target machine screen BIOS.

FIG. 6 is a difference diagram showing an operation when a function call is issued from a target machine AP to a BIOS other than the target machine screen BIOS by a S / W interrupt command.

FIG. 7 illustrates an OS for a base machine by emulating a S / W interrupt instruction from an AP for a target machine according to the first embodiment;
10 is a flowchart illustrating an operation when a function call to the display BIOS of the base machine is issued from the base machine OS or the base machine driver when the base machine driver is used.

FIG. 8 is a block diagram showing a second embodiment of the virtual machine emulator according to the present invention.

FIG. 9 illustrates an OS for a base machine by emulating a S / W interrupt instruction from an AP for a target machine according to the second embodiment;
10 is a flowchart illustrating an operation when a function call to the display BIOS of the base machine is issued from the base machine OS or the base machine driver when the base machine driver is used.

[Explanation of symbols]

 1, 100 virtual machine emulation device 2 initialization unit 3 control interrupt reception unit 4 S / W interrupt emulation 5 exception interrupt release / recovery unit 6 GEM (graphic emulator) 7 TEM (text emulator) 8 DEM (display) Emulator) 9 virtual target VRAM 10, 20 emulator transfer section 11 text-based screen emulation 12 AP for target machine 13 OS for base machine 14 driver for base machine 15 BIOS for base machine 16 peripheral I / O hardware for base machine 17 base VRAM for machine 18 CRT controller for base machine 19 Graphic base screen emulation

Continued on the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) G06F 9/46 G06F 9/455 G06F 3/14 CSDB (Japan Patent Office)

Claims (3)

(57) [Claims] 1. One computer (hereinafter referred to as a target machine) between computers having different architectures.
In order to run the target machine application software operating on the other computer (hereinafter referred to as a base machine), a screen display from the target machine application software is displayed on a virtual target VRAM via a text emulator and a graphic emulator. To emulate by converting the VRAM information for the target machine into the VRAM information for the base machine, and emulates other than the screen display to emulate the OS, BIOS, driver, peripheral I / O of the base machine.
In a virtual machine emulator for emulating using hardware, text-based screen emulation means for converting an instruction to a display system BIOS of the base machine into a display format on the target machine and supplying the display format to the text emulator; Emulator transfer means for transferring an instruction from the OS and / or driver of the base machine to the display BIOS of the base machine to the text-based screen emulation means. 2. One computer (hereinafter referred to as a target machine) between computers having different architectures.
In order to run the target machine application software operating on the other computer (hereinafter referred to as a base machine), a screen display from the target machine application software is displayed on a virtual target VRAM via a text emulator and a graphic emulator. To emulate by converting the VRAM information for the target machine into the VRAM information for the base machine, and emulates other than the screen display to emulate the OS, BIOS, driver, peripheral I / O of the base machine.
In a virtual machine emulator for performing emulation using hardware, a base screen emulator that converts an instruction to a display system BIOS of the base machine into a display format on the target machine and supplies the display format to the text emulator and the graphic emulator Means, and an emulator transfer means for transferring an instruction from the OS and / or driver of the base machine to the display system BIOS of the base machine to the base screen emulation means. Wherein the base screen emulating means includes: the base machine of the display system text-based screen emulation means for supplying to said text emulator into a display format in the target machine text relationship instruction to BIOS, the Display BIOS of base machine
3. A virtual machine emulation device according to claim 2 , further comprising: a graphic base screen emulation means for converting a graphic-related command to a display format on the target machine and supplying the graphic-based instruction to the graphic emulator.