JPS6347845A - Information processor - Google Patents

Abstract

PURPOSE:To shorten an accessing time, by switching an addition value to a specific value when a virtual computer accesses to the specific area of a main memory in a real computer. CONSTITUTION:When a flip-flop 4 is set at '0', namely, when an address set at a main memory address register 1 is the one that does not access to a hardware, a selector 5 selects a virtual main memory base register 3. In other words, the value of the virtual main memory base register 3 is added on the output of the main memory address register 1 at this time. Meanwhile, at the time of being accessed to the hardware area, it follows that the selector 5 selects a value '0' of a fixed value generation circuit 6 by setting the value of the flip-flop 4 at '1', and the address to be used for the accessing to a main memory device on the real computer always goes to the value set at the main memory address register 1 regardless the value of the virtual main memory base register 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information processing device, and particularly to a technique for generating addresses of a main storage device when realizing a virtual computer.

[Conventional technology]

Generally, when realizing a virtual computer, a part of the main storage of the real computer is allocated as the main storage of the virtual computer. FIG. 2 shows an example of the memory map. In Figure 2, the memory address of the real computer is O~167772.
There are up to number 15, but part of it is 1258291.
The main memory of the virtual machine is allocated to addresses 2 to 16777215. Then, on the virtual machine, addresses from 0 to 4194303 are assigned to the main memory in the above range. Therefore, since there is a certain difference between the main memory address of the virtual machine and the corresponding main memory address of the real computer, by adding a certain value to the main memory address of the virtual machine, the main memory address of the real computer is It is necessary to perform a conversion to a storage address.

Conventional information processing devices are equipped with a virtual main memory space conversion means that automatically performs this addition, so that there is no need to be aware of whether the processing executed on the virtual machine is a virtual machine or not. Ta. This is the virtual main memory space conversion unit 34 shown in FIG. When converting a main memory address of a virtual computer to a main memory address of a real computer, an added value is set in the virtual main memory pace register 33, and the main memory address on the virtual computer set in the main memory address register 31 is combined with this added value. is automatically added by the adder 32, so that the virtual computer does not need to be aware of this addition.

[Problem that the invention seeks to solve]

As described above, in the conventional information processing device, the virtual main memory space conversion unit adds the value of the virtual main memory pace register 33 to the main memory address of the virtual machine for every access to the main memory from the virtual machine. Therefore, when accessing the hardware area shown in the memory map in Figure 2 that stores information about input/output devices on the real computer from within the virtual computer, be aware that the above-mentioned addition will be performed in advance. Make corrections so that the correct value is obtained after the addition, or change the value of the virtual main memory pace register to O when accessing the hardware area and reset it to the overwhelming value after the access is completed. Since the settings need to be made, the disadvantage is that the processing speed decreases when accessing the hardware area.

[Means for solving problems]

An information processing device of the present invention includes, in an information processing device in which a virtual computer is running, a storage unit that holds a start address of a main storage space of a main storage device of a real computer allocated to the running virtual computer; fixed value generating means for generating a preset fixed value; display means for displaying that the virtual computer is accessing a specific area of the main storage of the real computer; a selection means for translating one of the fixed value generation means three times; and an addition means for adding the output of the selection means and an address used for accessing the main storage device on the virtual computer system. It consists of:

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention. The virtual main memory space conversion unit 10 includes an adder 2, a virtual main memory pace register 3. The selector 5 consists of a fixed value generation circuit 6, and the selector 5 is activated by a flip-flop 4 which indicates that the address for accessing the hardware area of the main memory of the actual computer has been set in the main memory address register 1.
Which of the virtual main memory pace register 3 and the fixed value generation circuit 6 selects one. Fixed value generation circuit 6 is a numerical value “0”
occurs.

The selector 5 selects the virtual main memory pace register 3 when the flip-flop 4 is 0, that is, when the address set in the main memory address register 1 is an address that does not access the hardware area. That is, at this time, the value of the virtual main memory pace register 3 is added to the output of the main memory address register 1. For example, the value of main memory address register 1 is 4,096 and the value of virtual main memory pace register 3 is 12.582,912 (12x220=12
In case M), the address used to access the main memory on the actual computer is 12,587,008. On the other hand, when accessing the hardware area, by setting the value of the flip-flop block 4 to "1", the selector 5 selects the value "O" of the fixed value generation circuit 6, and the virtual main memory In the above example, the address that is always used to access the main memory on the actual computer, regardless of the value of register 3, is 4,096.

Although this embodiment has been described with reference to the case where the fixed value is 0, the present invention is not limited to this, and any specific fixed value corresponding to a specific area of the hardware area, that is, the main memory may be used.

〔Effect of the invention〕

As explained above, when a virtual computer accesses a specific area of the main memory of a real computer, switching the addition value to a specific value has the effect of shortening the access time compared to the conventional method.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an embodiment of the present invention, Figure 2 is a memory map diagram showing the correspondence between main memory addresses in a virtual machine and main memory addresses in a real computer, and Figure 3 is a block diagram of a conventional example. be. 1.31...Main memory address register, 2.32...
・Adder, 3.33...virtual main memory pace register,
4...Pre-flop, 5...Selector, 6...
-Fixed value generation circuit, 10.34...virtual main memory space conversion unit.・-Representative Patent Attorney Uchihara ・Shinichi t'4NI aircraft 1 + real TF * 1 gun"; ntf14t
Atoshi λ Main note + t Atoshisu Figure 2 Figure 3

Claims (1)

[Claims] In an information processing device on which a virtual computer is running, a storage means for holding a start address of a main storage space of a main storage device of a real computer allocated to the running virtual computer, and generating a preset fixed value. a fixed value generation means for displaying that the virtual computer is accessing a specific area of the main storage of the real computer; Information characterized in that it includes a selection means for selecting either one, and an addition means for adding an output of the selection means and an address used for accessing the main storage device performed on the virtual computer system. Processing equipment.