JP2869198B2 - Information processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus capable of multi-window display, in which applications of different operating systems are assigned to windows and executed.

[0002]

2. Description of the Related Art An information processing apparatus represented by a computer has an operating system (hereinafter referred to as an OS) as a basic system. This OS includes UNIX (developed by AT & T Bell Laboratories, AT & T
MS-DOS (registered trademark of Microsoft Corporation in the United States) and the like. Then, an application program (application program) for a specific job is executed under the management of the OS.

In many cases, a UNIX application is operated on a window system (typically, an X window) that operates on UNIX of an OS kernel. This window system can perform display control, display a plurality of applications in a multi-window display, and sequentially execute the applications. The window system converts display data to V in response to a display request from the application.
The display data is written to the RAM, and the display data stored in the VRAM is read and displayed on the display.

[0004] As an application of UNIX, there is an MS-DOS emulator that emulates MS-DOS, and the system environment of UNIX and MS-DOS is simultaneously realized on the same hardware by the MS-DOS emulator. That is, the UNIX application and the M-DOS emulator
S-DOS applications can run on the same hardware.

[0005] Usually, the MS-DOS emulator is an MS-DOS emulator.
-Emulate the operation of the MS-DOS by emulating in UNIX the part that calls the routine (system call) for operating and managing the DOS system. Therefore, if a system call is made in the MS-DOS application, the MS-DOS
The DOS emulator traps it and performs emulation. If the system call is a display instruction, it issues a display request to the window system.

[0006]

The display screen of UNIX is composed of 1240 × 1024 dots, and the display screen of MS-DOS is composed of up to 640 × 480 dots. The operation of the emulator is assigned to one window. Since window management is performed by the window system, MS-DOS
Cannot directly access the VRAM to write the display data.

However, the MS-DOS application does not use a system call. For example, when drawing a circle or a special figure, the VRAM corresponding to the display screen of the display is directly accessed to write the display data, Is performed by writing display data to the VRAM by accessing a display control unit for controlling the display control. For this reason, some MS-DOS applications do not operate on the MS-DOS emulator.

[0008] The present invention has been made in view of such a point, and when one window is allocated to the operation of the OS emulator and multi-window display is performed, an application on the emulator directly accesses the VRAM. It is an object of the present invention to provide an information processing apparatus capable of executing an application for performing a drawing process without using a system call.

[0009]

SUMMARY OF THE INVENTION The present invention relates to an information processing apparatus provided with two OS environments simultaneously.
S, window control means for managing window display on the first OS, emulation means for a second OS operating on the first OS, application means based on the second OS, and window control A first display memory accessed by the means, a second display memory accessible by the application means, and a selection means for selectively outputting display data read from the first display memory and the second display memory. And display means for performing display in accordance with the display data output by the selection means.

[0010]

The display request from the application of the second OS is made directly to the second display memory to draw the display data. A display request is made in the first display memory from the window display means or the first OS, and the display data is drawn. The display data stored in the first display memory and the display data stored in the second display memory are selectively output by the selection means, and the display data of the first display memory and the display data of the second display memory are output. Is displayed in a window on the display means.

[0011]

FIG. 1 is a schematic block diagram of an embodiment of an information processing apparatus according to the present invention.

Reference numeral 1 denotes a CPU board composed of a CPU and a memory. On this CPU board 1, a UNIX 2 as a first operating system and a window system 3 (window control means for managing window display on the UNIX 2). X window) and UNI
X application 4 is incorporated. Further, C
The PU board 1 incorporates an emulator 5 as emulation means for emulating MS-DOS as a second operating system as a UNIX application, and an MS-DOS application 6.

7 has a size of 640 × 480 dots and has a size of MS
A DOS window memory as a second display memory accessed by the DOS application 6, and the application 6 accesses the DOS window memory 7 via a DOS display control circuit 8 that controls display based on MS-DOS.

9 is controlled by the window system 3 and UN
The main display control circuit 9 controls the display in the IX. The main display control circuit 9 includes a window memory 10 for storing display data in each window in the window display, and 1240 × 1024 dots corresponding to the display screen of the display. A main frame memory 11 serving as a first display memory for synthesizing and storing display data of each window in the window memory 10; display data read from the main frame memory 11; and display data read from the DOS window memory 7 Control of input / output of data of the enable frame memory 12 for storing control data for selecting the data.

Reference numeral 13 denotes a multiplexer as selection means for selecting display data read from the main frame memory 11 and display data read from the DOS window memory 7 in accordance with control data from the enable frame memory 12, and 14 denotes a multiplexer. 13 is a display as display means for performing display in accordance with display data output from 13.

In such a device, a display request from the UNIX application 4 is issued to the window system 3, and the window system 3 issues a command to the main display control circuit 9 in accordance with the display request.

In the case of window display, the main display control circuit 9
Sets the position and size of the window on the display screen, sets a window area in the window memory 10, and stores the display data in the window area. When a plurality of windows are set, display data is stored in each window area in the window memory 10. Then, the display data of each window stored in the window memory 10 is transferred to the main frame memory 11 and synthesized under the control of the main display control circuit 9. In this state, the main frame memory 11 stores display data corresponding to the display screen of the window display in UNIX.

On the other hand, MS-DOS application 6
Is executed, the emulator 5 traps and emulates an instruction using the MS-DOS system call. When the display instruction is not based on the system call, the application 6 outputs the DO command.
The DOS window memory 7 is accessed via the S display control circuit 8. That is, the execution of the display command in the execution of the application 6 is performed not by accessing the window memory 10 but by writing access from the DOS display control circuit 8 to the DOS window memory 7 based on the instruction of the application 6. Since the DOS window memory 7 is configured with a storage area corresponding to 640 × 480 dots, the MS-DOS application 6
(Via the DOS display control circuit 8).

Therefore, together with the UNIX application, an MS-DOS application that performs a drawing process without using a system call is executed on the emulator 5.

Next, control of window display on the display 14 will be described. The display data stored in each window area of the window memory 10 is transferred to the main frame memory 11 and synthesized under the control of the main display control circuit 9 (and the window system 3).

The enable frame memory 12 has the same address space as the main frame memory 11,
Under the control of the main display control circuit 9, the display data is written to the main frame memory 11, and at the same time, the same address of the enable frame memory 12 is accessed by the address for accessing the main frame memory 11. Control data for selecting display data that has been set (here, when writing display data from the window memory 10 to the main frame memory 11,
1 ") is written.

Further, when the display based on the MS-DOS application 6 is displayed on the display 14, the display of the MS-DOS application is displayed on the main frame memory 11 under the control of the main display control circuit 9 (and the window system 3). Window is set. At this time, display data indicating the area is written in the main frame memory 11 to indicate the window area set on the display 14. At the same time, under the control of the main display control circuit 9 (and the window system 3), control data for selecting display data (here, MS-DOS
"0") is set to indicate the display of the application, and the address of writing to the main frame memory 11 is simultaneously accessed in the enable frame memory 12, and this control is performed at the same address (position) as the main frame memory 11. Data ("0") is written.

The main display control circuit 9 reads out stored data (display data) from the main frame memory 11 at a predetermined timing for display on the display 14, and further sets a predetermined MS-DOS window. (The position of the MS-DOS window on the UNIX screen, that is, the position of 640 × 480 of the MS-DOS window in 1240 × 1024 of the UNIX system, and the position of the MS-DOS on the screen of the display 14) (Set separately from the window), the storage data (display data) is also read from the DOS window memory 7.

The display data read from the main frame memory 11 is input to the multiplexer 13, and the display data read from the DOS window memory 7 is also input to the multiplexer 13. Furthermore, the enable frame memory 12
Is read out in synchronization with the data read out from the main frame memory 11, and the control data
Has been entered. The multiplexer 13 selects and outputs one of the display data from the main frame memory 11 and the display data from the DOS window memory 7 according to the control data from the enable frame memory 12. That is, if the control data from the enable frame memory 12 is "1", the display data from the main frame memory 11 is selected. If the control data is "0", the display data from the DOS window memory 7 is selected.
Output to When the display data of the DOS window memory 7 is selected by the control data when the display data is not read from the DOS window memory 7 (when the MS-DOS window is not set), the data is undefined. Or display data of a preset color is output from the multiplexer 13.

The display 14 performs screen display according to the display data input from the multiplexer 13, and combines an image (window) based on the UNIX application and an image (window) based on the MS-DOS application on one screen. Is displayed.

The MS-D on the screen of the display 14
When a window for display based on the OS application 6 is not set, control data “0” for selecting display data from the DOS window memory 7 is not stored in the enable frame memory 13. The display data from the main frame memory 11 is always selected and output, and an image window is displayed on the display 14 based on the UNIX application.

In this embodiment, display data from the DOS window memory 7 accessed by the MS-DOS application 6 is directly output to the multiplexer 13.
If the DOS window memory 7 cannot support the read speed for UNIX display, as shown in FIG.
A DOS video memory 15 for temporarily storing display data from the DOS window memory 7 'is provided.
Display data may be input from the OS video memory 15 to the multiplexer 13.

When the DOS video memory 15 capable of coping with the reading speed for UNIX display is provided as described above, DO
A video signal as shown in FIG. 3 obtained by adding a clock for the retrace period to the display data stored in the S window memory 7 'is D
When output from the OS display control circuit 8, the DOS video memory 15 stores only the display data.
It is necessary to remove information other than the display data stored in the DOS window memory 7 'from the video signal output from the S display control circuit 8, that is, the clock in the flyback period. That is, the number of dots determined by the display method for each screen except for periods a and d in FIG. 3 (ex × b in FIG. 3, for example, 640 × 480 dots in the JEGA method, 64 dots in the EGA method)
0 × 350 dots, 640 × 200 or 32 for CGA compatible system
Display data must be stored in the DOS video memory 15 for a period of (0 × 200 dots). This is because, when the data is stored in the DOS video memory 15 while including the retrace periods a and d, the display data is shifted by the retrace period, and a part that is not displayed in the display data to be originally displayed is generated. This is because

Therefore, in order to eliminate the clock of the retrace period, the main display control circuit 9 controls the return of the vertical scanning period c set in advance for each display method in the video signal output from the DOS display control circuit 8. After counting the line period a and the flyback period d of the horizontal scanning period f, the display data (e × b) in the video signal is stored in the DOS video memory 15. The DOS video memory 15 stores b × e display data according to the display method at that time.

Further, when a plurality of display methods are used by switching, a, b, c, d, e,
Since the value of f is set differently, b according to the display method
The DOS display control circuit 8
The counter circuit 16 counts c (the number of horizontal synchronizing signals during one vertical scanning period) and f (the number of clocks during one horizontal scanning period) during the retrace period of the video signal output from the JEGA, The main display control circuit 9 makes a determination of a method such as EGA or CGA compatibility, and the main display control circuit 9 determines the number of dots (e ×
The display data b) is extracted from the video signal output from the DOS display control circuit 8 and stored in the DOS video memory 15.

The display data stored in the DOS video memory 15 is read out at the display timing to which the MS-DOS window is allocated, and the display data read out from the main frame memory 11 is multiplexed.
The image is selectively output at 13 and displayed on the display 14.

Although not shown, the display data corresponding to the display data is arbitrarily colored by a look-up table method with respect to the display data selectively output from the multiplexer 13.

[0033]

As is apparent from the above description, the present invention provides an M / M memory separately from the window memory and main frame memory accessed by UNIX or the window system.
Since the DOS window memory is directly accessed by the S-DOS application, the MS-DOS emulator executed by the MS-DOS emulator on UNIX is used.
As a DOS application, it is possible to execute an MS-DOS application that performs a drawing process without using a system call.

The display data of the DOS window memory provided in this way is selected and output by the multiplexer according to the control data stored in the enable frame memory together with the display data to be windowed organized and stored in the main frame memory. , MS-DOS application can be displayed at an appropriate position.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an information processing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an information processing apparatus according to another embodiment of the present invention.

FIG. 3 is an explanatory diagram of display data and a blanking period in a video signal.

[Explanation of symbols]

2 UNIX (first operating system) 3 window system (window control means) 5 emulator (emulation means) 6 MS-DOS application (application means) 7 DOS window memory (second display memory) 8 DOS display control circuit 9 Main display control circuit 10 Window memory 11 Main frame memory (first display memory) 12 Enable frame memory 13 Multiplexer (selection means) 14 Display (display means)

Claims (2)

(57) [Claims] A first operating system; window control means for managing window display on the first operating system; emulating means for a second operating system operating on the first operating system; Application means based on the second operating system, a first display memory accessed by the window control means, a second display memory accessible by the application means,
An information processing apparatus comprising: a selection unit that selectively outputs display data read from a display memory and a second display memory; and a display unit that performs display in accordance with the display data output by the selection unit. apparatus. 2. A window memory having a plurality of window areas corresponding to a first operating system, a first display memory for synthesizing and storing display data stored in a window area of the window memory, and a first display memory. An enable frame memory having the same address space as the display memory and storing control data for display data selection, a second display memory corresponding to a second operating system, and control data stored in the enable frame memory An information processing apparatus comprising a selection unit that inputs display data stored in a first display memory and display data stored in a second display memory and selectively outputs one of the display data and the display data.