JPH0822421A - Memory diagnostic method - Google Patents

Abstract

PURPOSE:To diagnose the whole memory area including a system area, an area accessed directly with a physical address, etc., on an OS. CONSTITUTION:For a memory diagnosis, the OS 1 acquires the mount state of a memory 4, an address value pointing an address conversion table 2, and the area accessed with the physical address, generates an address conversion table 3 for diagnostic area access, and also generates an in-use page map M1 showing a page currently in use and an undiagnosed area map M2 indicating an address conversion table area and the area accessed directly with the physical address. Then the in-use page map M1 is searched to save the page in use in a free page outside the area to be diagnosed, and a diagnostic program 5 diagnoses the memory outside the area to be diagnosed in order. To diagnose the undiagnosed area on the memory 4, the operation of an address converting mechanism is stopped and the undiagnosed area is all diagnosed with the physical address.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory diagnostic method, and more particularly, the present invention relates to an OS (operating system,
The present invention relates to a memory diagnosis method capable of diagnosing all memories from above.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing a conventional memory diagnosis method. Conventionally, in order to diagnose the entire area of the memory, as shown in FIG.
The diagnostic program TP is stored in the predetermined area A of S and the diagnosis is performed by the following procedure. The diagnostic program TP stored in the area A writes data in an area other than the area A, then reads the data, and diagnoses the area B of the memory depending on whether or not writing / reading is normally performed. The diagnostic program TP copies itself to an area other than the area A, and diagnoses the area A in which the diagnostic program TP was stored in the same manner as above. Reset the system and start up the OS.

[0003]

By the way, in the above-mentioned conventional memory diagnosis method, the diagnosis program cannot be operated on the OS, and in order to perform the memory diagnosis,
Needed a mechanism to load / execute the diagnostic program. Further, in order to simplify the processing of the diagnostic program, it is necessary to store all the diagnostic programs in the same page or in continuous areas.

The present invention has been made to solve the above-mentioned problems, and the first object of the present invention is even when the diagnostic programs are distributed and arranged in different pages. , The diagnostic program on the OS
An object of the present invention is to provide a memory diagnosing method capable of easily diagnosing a memory including a system area and the like. A second object of the present invention is to provide a memory diagnosing method capable of diagnosing an entire memory area including an area directly accessed by an address conversion table and a physical address by a diagnostic program on an OS. .

[0005]

FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, 1 is an OS, 2 is a system address conversion table, 3 is a diagnostic area address conversion table,
4 is a memory to be diagnosed, 5 is a diagnostic program, M1
Is a used page map, and M2 is an undiagnosed area map.

In order to solve the above-mentioned problems, according to the invention of claim 1 of the present invention, as shown in the figure, the operating system 1 is provided with a means for acquiring at least the mounted state of the memory 4 and an address conversion table 2. A means for acquiring an address value to be pointed and a means for acquiring an area directly accessed by a physical address are provided, and a function of accessing a system area in a user mode is provided. A page map in use M1 for recognizing a physical page in use,
An undiagnosed area map M2 for recognizing the area used in the address translation table and the area directly accessed by the physical address is created, and the in-use page map M is used.
The process of diagnosing the physical page in use in the diagnostic target area from 1 to save the physical page in use to an empty page outside the diagnostic target area, and diagnose the memory in the diagnostic target area by the memory diagnostic program 5. By repeating this, all the memory outside the undiagnosed area is diagnosed on the operating system.

According to a second aspect of the present invention, in the first aspect of the invention, the diagnostic area address conversion table 3 is created, and the diagnostic area address conversion table 3 enables access by a logical address. All the memory outside the undiagnosed area is diagnosed on the operating system. According to a third aspect of the present invention, in the first or second aspect of the invention, the undiagnosed area map M2 is searched for a physical page in the undiagnosed area, and the operation of the address translation mechanism is stopped to set the logical address. By diagnosing the undiagnosed area by the memory diagnosis program 5 in a state where the physical addresses are matched with each other, the entire area of the memory including the undiagnosed area is diagnosed.

[0008]

In FIG. 1, when the memory diagnosis is performed, the OS 1 acquires the mounting state of the memory 4, the address value pointing to the address conversion table 2, and the area to be accessed by the physical address, and access to the diagnostic area as necessary. Generate the address conversion table 3 for use, and use page map M
1. Create an undiagnosed area map M2.

Then, the in-use page map M1 is searched to save the in-use page to an empty page outside the diagnosis target area, and the diagnostic program 5 sequentially diagnoses the memory outside the non-diagnosis target area. When diagnosing the undiagnosed area on the memory 4, the operation of the address conversion mechanism is stopped and the entire undiagnosed area is diagnosed by the physical address.

According to the first aspect of the present invention, as described above, the in-use page map M1 for recognizing the in-use physical page and the area and physical address used in the address translation table are directly accessed. An undiagnosed area map M2 for recognizing an area being used is created, and a physical page in use in the diagnosis target area is searched from the in-use page map M1 to find the physical page in use outside the diagnosis target area. Since the memory in the diagnostic target area is diagnosed by the memory diagnostic program 5 by evacuating to an empty page, the diagnostic program on the OS can diagnose the memory including the system area.

According to a second aspect of the present invention, in the first aspect of the invention, the diagnostic area address conversion table 3 is used.
Is created to diagnose the memory, the memory can be diagnosed without rewriting the address conversion table for the system. According to a third aspect of the present invention, in the first or second aspect of the present invention, an undiagnosed area is detected by the memory diagnostic program 5 in a state where the operation of the address translation mechanism is stopped and the logical address and the physical address are matched. Therefore, the entire memory area including the area directly accessed by the address conversion table and the physical address can be diagnosed.

[0012]

EXAMPLES Next, examples of the present invention will be described. In the present embodiment, the memory diagnostic program executes the memory diagnostics using various memory test patterns. However, the following functions are added to the OS in order to diagnose the entire memory area including the system area on the OS. Set up. A function to acquire the mounting status of the memory.

That is, it is a function of acquiring how many MB of memory is mounted in the numbered slot of the memory, and sets a diagnostic range by a diagnostic program, which will be described later, based on the mounted state of the memory. A function to acquire the page that is directly accessed by the physical address instead of the logical address.

Since a program operates by a logical address in a normal OS, it is considered that there are almost no pages directly accessed by a physical address. For example, when the OS crashes and ROM is used, R
There may be a page directly accessed by the physical address from the OM routine, and if this area is destroyed by the memory diagnosis, the ROM routine cannot be used. Therefore, when there is a page directly accessed by the physical address, it is necessary to acquire the page position.

Of the pages accessed by the physical address, RO is set at system startup (boot time).
The area directly accessed by the physical address from the program stored in M can be destroyed by the memory diagnostic program without any problem. Therefore, when the page directly accessed by the physical address is such an area, memory diagnosis is possible, and it is not necessary to be aware of such a page.

Further, the display display routine is ROM
If the area is destroyed and is accessed by the physical address, it becomes impossible to display. Therefore, when it is necessary to display the diagnosis result in the diagnostic program, the display display routine needs to be included in the diagnostic program. A function to acquire the value of the context point register (hereinafter referred to as CXR) that points to the address conversion table.

When there are a plurality of address conversion tables,
This is a function of acquiring the CXR value and acquiring the pointed address conversion table. By acquiring the address of the pointed address conversion table, the diagnostic area on the memory is determined. Ability to access the system area in user mode. Generally, in many cases, the system area is protected so that it cannot be accessed in the user mode. However, in the present embodiment, the entire memory area including the system area is diagnosed by the diagnostic program operating in the user mode as described above. ing. Therefore, it is necessary to remove the protection and provide a function for accessing the system area in the user mode.

2 to 4 are views showing an embodiment of a memory diagnosing method according to the present invention. FIG.
Is the address conversion table of the system in FIG. 2, and FIG.
Shows an address conversion table for accessing the diagnostic area in FIG. In the figure, 11 is a system address conversion table, and the system address conversion table 11 is composed of a context table T1, a region table T2, a segment table T3, and a page table T4 pointed by the CRX. Reference numeral 12 is a diagnostic area access address conversion table generated during memory diagnosis, and is a segment table T
5 and a page table T6, one segment table points to a 16 MB area, and four segment tables point to a 64 MB area.

Reference numeral 13 is a memory to be diagnosed, and physical pages of the memory 13 are used by a ROM, an address conversion table, a monitor, a scheduler, a memory diagnostic program of this embodiment, and the like. Next, this embodiment will be described with reference to FIGS. The numbers in parentheses in the figure correspond to the numbers in parentheses below. (1) In FIG. 2, at the time of starting the memory diagnosis, the physical page of each slot of the memory 13 is a ROM,
It is used by the address translation table, monitor, scheduler, and memory diagnostic program.
As shown in (1), the system address translation table points to those physical pages.

During execution of the following memory diagnosis, it is necessary to set a state in which other processes are not dispatched (execution right is not given). For example, by accessing a register for controlling interrupts, interrupts other than NMI are generated. Keep a mask. (2) Obtain the logical address of each address translation table to access the system address translation table.
That is, the CXR shown in FIG.
Is obtained to obtain the logical address of the context table T1 and the logical addresses of the region table T2, the segment table T3 and the page table T4. If the physical address directly accesses the address translation table, this process is unnecessary. (3) The diagnostic program stored in the memory 13 accesses the diagnostic target area with a logical address, so that an area of the diagnostic area address conversion table 12 is secured and initialized.

It is possible to make a diagnosis by using the system address conversion table, but for that purpose, the system address conversion table needs to be rewritten, and the system address conversion table needs to be written back after the diagnosis. come. It is also possible to use an empty address conversion table, but in this case it is necessary to search the empty address conversion table. Therefore, in this embodiment, the diagnostic address conversion table is separately created as described above. (4) Map MP1 (known as undiagnosed area map) for recognizing the physical page used in the address translation table
Create If there is a page that is not directly pointed to by the page table T4 and is directly accessed by the physical address, the page that is directly accessed by the physical address is acquired by the function added to the OS, and the undiagnosed area map MP1 is acquired. To reflect. (5) An area for registering the diagnostic area address conversion table 12 is secured in the region table T2. (6) Create an in-use page map MP2 for recognizing all used physical pages. (7) Register the diagnostic area address conversion table 12 in the region table T2, and execute the diagnostic area address conversion table 1
2 enables the diagnosis target area to be accessed by a logical address. (8) If there is a physical page in use in the diagnostic target area of the memory, map a free physical page other than the diagnostic area to MP2
Search more and copy the contents of the page to the empty page.

For example, as shown in FIG. 2, when the slot 2 of the memory 13 is the memory diagnostic target area, and if there is a page in use in that area, the page in use is set to the slot 1
Copy to an unused page in. (9) Since the physical page has been moved, the address translation table 11 and cache data are flushed (erased) in order to rewrite the system address translation table 11.
To do. (10) The address translation table 11 of the system is rewritten according to the moved physical page. (11) The diagnostic program diagnoses the memory in the above diagnostic target area. However, since the page storing the system address conversion table 11 and the page storing the diagnostic area address conversion table 12 and the page directly accessed by the physical address are registered in the map MP1, the above map The page is acquired by referring to MP1, and the page is removed from the diagnosis target (this area is defined as an undiagnosed area).

An example of the size of the non-diagnosing area when the address translation table area is not diagnosed is shown below. These numbers naturally change depending on the processor. a. System address translation table area ・ Context table 65536 * 4 = 256KB ・ Region table 256 * 4 = 1KB ・ Segment table 256 * 64 * 4 = 64KB (when using all areas) ・ Page table 256 * 64 * 64 * 4 = 4MB (when using all areas) b. Address translation table area for diagnostic area ・ Segment table 64 * 64 * 4 = 1KB ・ Page table 64 * 64 * 4 * 4 = 64KB Note that the segment table and page table in the system address translation table normally use the entire area. The area that is actually used is as follows.

-Segment table 3 * 64 * 4 = 768KB-Page table 3 * 64 * 64 * 4 = 48KB In other words, considering the area actually used, the area used in the address translation table is about 435KB. It is considered to be the degree. Therefore, virtually all the memory can be diagnosed without diagnosing the area used by the address translation table. However, if the diagnosis needs to be performed including this area, the method described later will be used. Diagnose with.

The address translation table area is diagnosed as follows.
As mentioned above, it is possible to diagnose by moving the physical page used by the address translation table, but if the physical page used by the address translation table is moved, all the address translation tables that affect it can be diagnosed. It is necessary to rewrite the area, which complicates the processing. For this reason, the address conversion table area is set as an undiagnosed area, and the diagnosis is performed by the same method as the page directly accessed by the physical address as described later. (12) Flush (erase) the address translation table and cache data. (13) Restore the moved physical page. (14) Since the physical page was restored, rewrite the system address translation table. (15) The undiagnosed area directly accessed by the address conversion table area and the physical address is diagnosed by the method described later.

FIG. 5 is a flow chart showing the above-mentioned processing procedure. The numbers in circles in FIG.
It corresponds to the processing of (15). In step S1 of the figure, the preparation process described in the above (1) to (3), (5), and (7) is performed.
In step S2, the map MP1 of the undiagnosed area is created, and in step S3, the map MP2 of the in-use page is created.
Create

In step S4, it is determined whether all slots have been diagnosed, and the processes of steps S5 to S8 are repeated until the diagnosis of all slots is completed.
That is, in step S5, as described in (8) to (10) above, the used page is saved from the diagnosis target slot to an empty page in another slot, and the various memory test patterns known in step S6 are used to save the used page in the slot. Diagnose everything and see if there are any errors. When an error occurs, error information such as the error address and status register is displayed in step S7.

Then, in step S8, (12) to (1
As described in 4), the save page restoration process is performed, and the process returns to step S4. When the diagnosis of all the slots is completed, the undiagnosed area is diagnosed by the method described later and the operation is completed. Next, a method for diagnosing the above undiagnosed area will be described. FIG. 6 is a flowchart showing a processing procedure for diagnosing the above-mentioned undiagnosed region, and this embodiment will be described with reference to FIG.

In the following flow chart, the case where an MMU (memory management unit) is used as the hardware for performing the address conversion will be described. However, even when the MMU is not used, the operation of the address conversion mechanism is stopped. If the OS is provided with the function to perform, the same operation can be performed. In step T1 of FIG. 7, a page having a logical address and an empty physical address is searched from the map MP2 showing the physical page in use, and the diagnostic program itself is copied to the page in step T2.

At step T3, the MMU is disabled. As a result, the program is executed with logical address = physical address. At step T4, an undiagnosed area is obtained from the map MP1 of the undiagnosed area, and all the undiagnosed areas are diagnosed. Diagnosis of the undiagnosed area is similar to that of FIG. 5, and all the undiagnosed areas are diagnosed page by page with various memory test patterns to check whether or not there is an error.

When an error occurs, step T5
In step T6, the error information is stored in the determined area, and the MMU is enabled in step T6. This makes it possible to access using the logical address. In step S7, the error information is acquired from the above-mentioned determined area, and the process ends. After that, the error information is read out and displayed on the OS.

[0032]

As described above, in the present invention, the in-use page map for recognizing the in-use physical page, the area used in the address translation table and the area directly accessed by the physical address are used. Create a non-diagnostic area map for recognizing, and search the physical page in use in the diagnostic target area from the above used page map and save the physical page in use to a free page outside the diagnostic target area, Since the memory is diagnosed by the memory diagnostic program, the memory including the system area can be diagnosed on the OS.

Further, by creating the address translation table for the diagnostic area and diagnosing the memory, the memory can be diagnosed without rewriting the address translation table for the system. Furthermore, by stopping the operation of the address translation mechanism and diagnosing the undiagnosed area with the logical address and the physical address matched, the entire memory area including the address translation table and the area directly accessed by the physical address can be detected. It becomes possible to diagnose.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a diagram showing an embodiment of a memory diagnosis method according to the present invention.

FIG. 3 is a diagram (continuation) showing an embodiment of a memory diagnosing method in the present invention.

FIG. 4 is a diagram (continuation) showing an embodiment of a memory diagnosing method in the present invention.

FIG. 5 is a diagram showing a memory diagnosis processing procedure in the embodiment of the present invention.

FIG. 6 is a diagram showing a method of diagnosing an undiagnosed region in the embodiment of the present invention.

FIG. 7 is a diagram showing a conventional memory diagnostic method.

[Explanation of symbols]

1 OS 2 System address conversion table 3 Diagnostic area address conversion table 4 Memory 5 Diagnostic program 11 System address conversion table 12 Diagnostic area access address conversion table 13 Memory M1, MP2 Busy page map M2, MP1 Non-diagnostic area map T1 context table T2 region table T3, T5 segment table T4, T6 page table CXR context point
register

Claims (3)

[Claims] 1. An operating system, at least means for obtaining a mounted state of a memory, and means for obtaining an address value pointing to an address conversion table,
Use to recognize the physical page being used when diagnosing the memory with the memory diagnostic program, by providing the means to acquire the area directly accessed by the physical address and the function to access the system area in the user mode. Create an undiagnosed area map for recognizing the medium page map, the area used in the address translation table, and the area directly accessed by the physical address. By searching the physical page, saving the used physical page to an empty page outside the diagnostic target area, and repeating the process of diagnosing the memory in the diagnostic target area by the memory diagnostic program, no diagnosis is made on the operating system. A method of diagnosing a memory, which comprises diagnosing all memories outside the area. 2. An address translation table for a diagnostic area is created, access by a logical address is made possible by the address translation table for a diagnostic area, and a diagnostic program diagnoses all memories outside the undiagnosed area on the operating system. The method for diagnosing a memory according to claim 1, wherein: 3. The undiagnosed area is searched by the memory diagnostic program in a state where the physical page of the undiagnosed area is searched for by searching the undiagnosed area map and the operation of the address translation mechanism is stopped so that the logical address and the physical address match. 3. The method of diagnosing a memory according to claim 1, wherein the entire area of the memory including the undiagnosed area is diagnosed by performing the diagnosis.