CN105975407B - Memory address mapping method and device - Google Patents

Abstract

The embodiment of the present invention discloses a memory address mapping method and device. When performing memory address mapping in the embodiment of the present application, the first service process obtains the physical memory by applying, and determines the physical memory address from the pre-determined virtual memory space according to the offset value of the pre-calculated physical memory address and the virtual memory address. Corresponding virtual memory addresses, establish a mapping relationship, and create a shared memory area. At the same time, the second business process obtains the same memory size and memory area ID as the first business process to create the same shared memory area to realize the mapping of memory addresses. The conversion between the address and the virtual memory address only needs to be obtained through the pre-calculated offset value, which improves the conversion efficiency of the physical memory address and the virtual memory address.

Description

A memory address mapping method and device

technical field

The present invention relates to the technical field of computers, in particular to a memory address mapping method and device.

Background technique

In the Linux operating system or Unix operating system, the mmap interface can map a file or other object into memory, and the operation of the file or other object can be as convenient as operating the memory. It is generally used in scenarios such as data sharing between processes, copy-free data sharing between user mode and kernel mode, and user programs directly operating devices.

The software process in the operating system calls the mmap interface to map a segment of physical memory space, and returns the starting virtual memory address corresponding to the segment of physical memory space after completion. The software establishes the mapping relationship between the physical memory address and the virtual memory address. When the software interacts with a Field-Programmable Gate Array (FPGA) device, it needs to tell the FPGA the physical memory address where the data to be processed is stored, and the FPGA returns after processing it. When the software reads the processing result, it needs to store and process it first. The resulting physical memory address is converted to a virtual memory address.

When there are multiple processes that need to interact with the FPGA device, due to the limitation of FPGA resources, it is impossible to provide a one-to-one interaction queue with each process (for example, there are 1000 processes interacting with the FPGA, if each process needs to provide a one-to-one interaction queue Queue, you need 2000 queues, each process has 1 receive queue, 1 send queue). Therefore, the process of sharing the queue is generally adopted. As shown in Figure 1, the business process processes specific services and sends the messages to be processed to the FPGA through the request queue; after the FPGA is processed, the processing results are placed in the result queue; forwarding The process reads the result from the result queue, and parses the result based on which business process the message belongs to, and forwards it to the corresponding business process, or directly processes the result.

Therefore, the forwarding process must be able to identify the content of the result queue, parse and process the information of the content, and require the physical memory space applied by each business process to be shared with the forwarding process. In this sharing scenario, the forwarding process has the address mapping relationship of multiple memory areas. If there are many business processes, or each business process creates many memory areas, the entry of this mapping table will be larger, and the virtual memory address will be the same as The conversion of physical memory addresses requires a table lookup, and the conversion efficiency is low.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a memory address mapping method and device, which improve the conversion efficiency between physical memory addresses and virtual memory addresses.

On the one hand, an embodiment of the present application provides a method for mapping a memory address, and the method is applied to a target device, where the target device is a terminal or a server, and an operating system is installed in the target device, and the operating system includes At least one business process, the at least one business process includes a first business process and a second business process, and the method includes:

A first memory application request is generated by the first business process, where the first memory application request includes an application memory size and a memory area identifier;

The first physical memory address is allocated from the reserved physical memory space by the first business process according to the memory application request, and according to the offset value of the pre-calculated physical memory address and the virtual memory address, the virtual memory Allocate a first virtual memory address corresponding to the first physical memory address in the memory space, and the virtual memory space is determined by the physical memory space;

Establishing, by the first service process, a mapping relationship between the first virtual memory addresses corresponding to the first physical memory addresses, and creating a first shared memory area;

Obtain the requested memory size and the memory area identifier through the second business process;

The first shared memory area is created by the second service process according to the requested memory size and the memory area identifier.

In the embodiment of the present application, when performing memory address mapping, the business process obtains the physical memory by applying, and determines the corresponding physical memory address from the pre-determined virtual memory space by using the pre-calculated offset value of the physical memory address and the virtual memory address. virtual memory address, establish a mapping relationship, create a shared memory area, and notify the second business process of the memory size and memory area identifier, so that the second business process creates the same shared memory area and realizes the mapping of memory addresses. The conversion between the address and the virtual memory address only needs to be obtained through the pre-calculated offset value, which improves the conversion efficiency between the physical memory address and the virtual memory address.

In a possible design, before calculating the first virtual memory address corresponding to the first physical memory address according to the pre-calculated offset value of the physical memory address and the virtual memory address, the physical memory may be pre-calculated The offset value between the address and the virtual memory address to use as a base value for calculations between the physical memory address and the virtual memory address.

At this time, that is, before calculating the first virtual memory address corresponding to the first physical memory address according to the pre-calculated offset value of the physical memory address and the virtual memory address, the method may further include:

Calculate the offset value of the physical memory address and the virtual memory address. The offset value of the physical memory address and the virtual memory address can be the starting address of the reserved physical memory space (such as phy_start) and the starting address of the pre-allocated virtual memory address space. Offset value between start addresses (such as vir_start): that is, for example, the offset value offset=phy_start-vir_start.

In another possible design, the calculating the offset value between the physical memory address and the virtual memory address may include:

Obtain the starting address of the physical memory space and the size of the physical memory space;

Allocate the virtual memory space according to the starting address of the reserved physical memory space and the size of the physical memory space;

According to the starting address of the physical memory space and the starting address of the virtual memory space, the offset value of the physical memory address and the virtual memory address is calculated.

In another possible design, the permission is set to be inaccessible before the virtual memory address in the virtual memory space is not allocated;

After allocating the first virtual memory address corresponding to the first physical memory address from the predetermined virtual memory space, the method further includes:

The first virtual memory address is set in the virtual memory space to be accessed only by the first service process.

In this way, a process can only access the memory space allocated to it, but cannot access the memory space or unallocated memory space of other processes, achieving the effect of memory isolation and protection.

In another possible design, the acquiring the requested memory size and the memory area identifier through the second business process may include:

Send a notification message to the second service process through the first service process, where the notification message includes the requested memory size and the memory area identifier;

The notification message is received by the second service process, and the requested memory size and the memory area identifier are acquired.

In this case, the business process notifies the second business process of the size of the application memory and the memory area identifier by sending a notification message, so that the second business process creates the same shared memory area as the business process and realizes the memory For the mapping of addresses, it can be understood that obtaining the application memory size and the memory area identifier through the second business process may also be: obtaining the Applying for the memory size and the memory area identifier, for example, the application memory size and memory area identifier are pre-agreed in the second business process and the business process, and the second business process and the business process obtain the agreed application memory size and the memory area District ID.

In another possible design, in this embodiment of the present application, a shared memory area may be created between multiple service processes and the second service process. In this case, the at least one service process may further include a third service process, The method may also include:

A second memory application request is generated by the third business process, and the second memory application request includes the application memory size and the memory area identifier;

A second physical memory address is allocated from the physical memory space by the third business process according to the memory application request, and a second physical memory address is allocated from the virtual memory space according to the pre-calculated offset value of the physical memory address and the virtual memory address. Allocate the second virtual memory address corresponding to the second physical memory address in ;

Establish a mapping relationship between the second virtual memory addresses corresponding to the second physical memory addresses by the third service process, and create a second shared memory area;

The second business process obtains the application memory size and the memory area identifier in the second application request;

The second shared memory area is created by the second business process according to the application memory size and the memory area identifier in the second application request.

At this time, in the embodiment of the present application, a shared memory area may be created between multiple service processes and the second service process, so as to realize the mapping of multiple memory addresses.

In another possible design, the at least one business process further includes a fourth business process, and the method further includes:

Obtain the requested memory size and the memory area identifier;

The first shared memory area is created by the fourth business process according to the requested memory size and the memory area identifier.

In this case, no matter what process or how many processes, only the same memory area identifier and memory size information are obtained. The memory area created according to the memory area identifier and memory size is the same shared memory area, which realizes the memory area. fair use.

In a second aspect, an embodiment of the present application provides a device, the device is a terminal or a server, the device includes at least one processor and a memory, the memory stores an operating system, and the operating system includes at least one a business process, the at least one business process includes a first business process and a second business process; the first business process includes a business module and a memory module, and the second business process includes a business module and a memory module;

The at least one processor is configured to run a process stored in the memory to perform the following steps:

A first memory application request is generated by the service module of the first service process, and the first memory application request includes an application memory size and a memory area identifier;

The memory module of the first business process allocates the first physical memory address from the reserved physical memory space according to the memory application request, and according to the pre-calculated offset value of the physical memory address and the virtual memory address, from the pre-calculated physical memory address Allocate a first virtual memory address corresponding to the first physical memory address in the determined virtual memory space, and the virtual memory space is determined by the physical memory space;

The memory module of the first business process is also used to establish a mapping relationship between the first virtual memory addresses corresponding to the first physical memory addresses, and to create a first shared memory area;

Obtain the application memory size and the memory area identifier through the service module of the second service process;

The first shared memory area is created by the memory module of the second service process according to the requested memory size and the memory area identifier.

In a possible design, before the memory module of the first service process calculates the first virtual memory address corresponding to the first physical memory address according to the pre-calculated offset value of the physical memory address and the virtual memory address , the at least one processor is specifically configured to calculate the offset value of the physical memory address and the virtual memory address through the memory module of the first service process.

In another possible design, the at least one processor is specifically configured to obtain the starting address of the physical memory space and the size of the physical memory space through the memory module of the first service process; according to the Reserve the starting address of the physical memory space and the size of the physical memory space, and allocate the virtual memory space; calculate the physical memory address according to the starting address of the physical memory space and the starting address of the virtual memory space and the offset value of the virtual memory address.

In another possible design, the permission is set to be inaccessible before the virtual memory address in the virtual memory space is not allocated;

After allocating the first virtual memory address corresponding to the first physical memory address from the predetermined virtual memory space, the at least one processor is further configured to use the memory module of the first service process in the virtual memory In the memory space, the first virtual memory address is set to be accessed only by the first service process.

In another possible design, the at least one processor is specifically configured to send a notification message to the service module of the second service process through the service module of the first service process, where the notification message includes the Apply for the memory size and the memory area identifier;

The at least one processor is further configured to receive the notification message through the service module of the second service process, and acquire the requested memory size and the memory area identifier.

In another possible design, the at least one business process further includes a third business process, and the third business process includes a business module and a memory module;

The at least one processor is further configured to generate a second memory application request through the service module of the third service process, where the second memory application request includes an application memory size and a memory area identifier;

The at least one processor is further configured to allocate a second physical memory address from the reserved physical memory space through the memory module of the third service process according to the memory application request, and allocate a second physical memory address according to the pre-calculated physical memory address and virtual memory space. The offset value of the memory address, the second virtual memory address corresponding to the second physical memory address is allocated from a predetermined virtual memory space, and the virtual memory space is determined by the physical memory space;

The at least one processor is further configured to create a second shared memory area by establishing a mapping relationship between the second virtual memory addresses corresponding to the second physical memory addresses through the memory module of the third service process;

The at least one processor is further configured to obtain the application memory size and the memory area identifier in the second application request through the service module of the second service process;

The at least one processor is further configured to, through the memory module of the second service process, create the second shared memory area according to the size of the application memory and the memory area identifier in the second application request.

In another possible design, the at least one business process further includes a fourth business process, and the fourth business process includes a business module and a memory module;

The at least one processor is also configured to run a process stored in the memory to perform the steps of:

Obtain the application memory size and the memory area identifier through the service module of the fourth service process;

The first shared memory area is created by the memory module of the fourth service process according to the requested memory size and the memory area identifier.

As can be seen from the above technical solutions, the embodiments of the present invention have the following advantages:

In the embodiment of the present application, when performing memory address mapping, the first service process obtains the physical memory by applying, and determines the physical memory address from the pre-determined virtual memory space by using the pre-calculated offset value of the physical memory address and the virtual memory address. Corresponding virtual memory address, establish a mapping relationship, create a shared memory area, and notify the second business process of the memory size and memory area identifier, so that the second business process creates the same shared memory area and realizes the mapping of memory addresses. The conversion between the physical memory address and the virtual memory address only needs to be obtained through the pre-calculated offset value, which improves the conversion efficiency of the physical memory address and the virtual memory address.

Description of drawings

1 is a system frame diagram of a prior art memory address mapping method;

2 is a block diagram of a first service process and a second service process in an embodiment of the present invention;

3 is a schematic diagram of an embodiment of a method for mapping memory addresses in an embodiment of the present invention;

4 is a schematic diagram of another embodiment of a method for mapping a memory address in an embodiment of the present invention;

FIG. 5 is a schematic diagram of another embodiment of the device in the embodiment of the present invention.

Detailed ways

Embodiments of the present invention provide a memory address mapping method and device, which improve the conversion efficiency between physical memory addresses and virtual memory addresses.

In order to make those skilled in the art better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only Embodiments are part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms "first", "second", etc. (if present) in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

The embodiments of the present application are applied in a target device, the target may be a terminal or a server, an operating system is installed in the target device, and the operating system may be a Linux operating system or a Unix operating system, and the operating system includes at least one Business process, the at least one business process includes a first business process and a second business process, and the relationship between the second business process and the first business process may be as shown in FIG. Including a business module and a memory module, the business module is used to receive or send messages, and the memory module is used to manage and allocate physical memory space and virtual memory space, wherein the business module of the second business process and the business module of the first business process A connection is established between them, and information can be exchanged between the service modules and the memory modules in the first service process and the second service process.

The following describes the mapping method of the memory address in the embodiment of the present application.

Referring to FIG. 3, an embodiment of a method for mapping a memory address in an embodiment of the present invention includes:

301. Generate a first memory application request through the first business process;

Wherein, the first memory application request includes an application memory size and a memory area identifier;

302. Allocate a first physical memory address from the reserved physical memory space through the first business process according to the memory application request;

303. Allocate a first virtual memory address corresponding to the first physical memory address from a predetermined virtual memory space according to the pre-calculated offset value of the physical memory address and the virtual memory address;

Wherein, the virtual memory space is determined by the physical memory space;

In this embodiment of the present application, before calculating the first virtual memory address corresponding to the first physical memory address according to the pre-calculated offset value of the physical memory address and the virtual memory address, the physical memory address and the virtual memory address may be pre-calculated. Offset value between virtual memory addresses to use as a baseline for calculations between physical memory addresses and virtual memory addresses.

At this time, that is, before calculating the first virtual memory address corresponding to the first physical memory address according to the pre-calculated offset value of the physical memory address and the virtual memory address, the method may further include:

Calculate the offset value of the physical memory address and the virtual memory address. The offset value of the physical memory address and the virtual memory address can be the starting address of the reserved physical memory space (such as phy_start) and the starting address of the pre-allocated virtual memory address space. Offset value between start addresses (such as vir_start): that is, for example, the offset value offset=phy_start-vir_start.

Specifically, the calculating the offset value between the physical memory address and the virtual memory address may include:

Obtain the starting address of the physical memory space and the size of the physical memory space;

Allocate the virtual memory space according to the starting address of the reserved physical memory space and the size of the physical memory space;

According to the starting address of the physical memory space and the starting address of the virtual memory space, the offset value of the physical memory address and the virtual memory address is calculated.

304. Create a first shared memory area by establishing a mapping relationship between the first virtual memory addresses corresponding to the first physical memory addresses by the first service process;

305. Obtain the requested memory size and the memory area identifier through the second service process;

Optionally, the obtaining of the size of the application memory and the identifier of the memory area through the second business process may be performed in a variety of ways, which may be specifically as follows:

(1) Obtaining the application memory size and the memory area identifier through the second service process includes: sending a notification message to the second service process through the first service process, where the notification message contains The application memory size and the memory area identifier are included; the notification message is received by the second service process, and the applied memory size and the memory area identifier are acquired.

(2) Obtain the application memory size and the memory area identifier by pre-agreing the same rules in the second business process and the business process, for example, pre-agreed the application memory size and memory area identifier in the second business process and the business process , the second service process and the service process obtain the agreed upon application memory size and the memory area identifier.

306. Create the first shared memory area by the second service process according to the size of the applied memory and the memory area identifier.

In the embodiment of the present application, when performing memory address mapping, the business process obtains the physical memory by applying, and determines the corresponding physical memory address from the pre-determined virtual memory space by using the pre-calculated offset value of the physical memory address and the virtual memory address. virtual memory address, establish a mapping relationship, create a shared memory area, and notify the second business process of the memory size and memory area identifier, so that the second business process creates the same shared memory area and realizes the mapping of memory addresses. The conversion between the address and the virtual memory address only needs to be obtained through the pre-calculated offset value, which improves the conversion efficiency between the physical memory address and the virtual memory address.

Optionally, the permission is set to be inaccessible before the virtual memory address in the virtual memory space is allocated; after the first virtual memory address corresponding to the first physical memory address is allocated from the predetermined virtual memory space, the Methods also include:

The first virtual memory address is set in the virtual memory space to be accessed only by the first service process.

In this way, a process can only access the memory space allocated to it, but cannot access the memory space or unallocated memory space of other processes, achieving the effect of memory isolation and protection.

Optionally, in the embodiment of the present application, a shared memory area may be created between multiple service processes and the second service process. In this case, the at least one service process may further include a third service process, and the method may also include:

A second memory application request is generated by the third business process, and the second memory application request includes the application memory size and the memory area identifier;

A second physical memory address is allocated from the physical memory space by the third business process according to the memory application request, and a second physical memory address is allocated from the virtual memory space according to the pre-calculated offset value of the physical memory address and the virtual memory address. Allocate the second virtual memory address corresponding to the second physical memory address in ;

Establish a mapping relationship between the second virtual memory addresses corresponding to the second physical memory addresses by the third service process, and create a second shared memory area;

The second business process obtains the application memory size and the memory area identifier in the second application request;

The second shared memory area is created by the second business process according to the application memory size and the memory area identifier in the second application request.

The at least one business process further includes a fourth business process, and the method further includes:

Obtain the requested memory size and the memory area identifier;

The first shared memory area is created by the fourth business process according to the requested memory size and the memory area identifier.

In this case, no matter what process or how many processes, only the same memory area identifier and memory size information are obtained. The memory area created according to the memory area identifier and memory size is the same shared memory area, which realizes the memory area. fair use.

In order to facilitate a better understanding of the technology, the following embodiments describe in detail the memory address method described in the foregoing embodiments in a specific application scenario.

As shown in Figure 4, the Linux system of a terminal has three business processes: business process 1, business process 2 and business process 3. Each process includes a business module and a memory module. When each process is initialized, the memory module of each process is obtained from the system. The starting physical address of the reserved memory phy_start=0x3c8000000 and the size phy_size=0x40000000; then call the open interface to create a new file, the file name is "mem_vap", such as fd=open("mem_vap", O_RDONLY|O_CREAT); the file is created successfully Then call the mmap interface to apply for virtual memory, the size of which is 0x40000000, the size of the physical memory, such as mmap(NULL, 0x40000000, PROT_NONE, MAP_PRIVATE, fd, 0).

The initial virtual memory addresses that the three business processes return to the system are:

vir_start_1=0x7fffb0000000;

vir_start_2=0x7fffa0000000;

vir_start_3=0x7fff00000000.

According to the starting virtual memory address of Step1, each process calculates the offset values as offset_1=0x7ffbe8000000, offset_2=0x7ffbd8000000, and offset_3=0x7ffb38000000.

The business module of business process 1 applies for 32MB of shared memory, and calls the application function shm_alloc(0x2000000, shared, "p1_share_1") of the memory module; according to the allocation algorithm, the memory module obtains the physical address of 0x3c8000000, and calculates the corresponding virtual memory as 0x3c8000000+ 0x7ffbe8000000=0x7fffb0000000.

The memory module of business process 1 calls the munmap function to release the memory space requested by Step1, the size is 32MB, munmap (0x7fffb0000000, 0x2000000).

The memory module of the business process 1 calls the mmap function to establish a mapping relationship between the allocated physical memory address and the virtual memory address. First open the device fd=open("/dev/mem", O_RDWR, S_IRUSR|S_IWUSR), then call mmap(0x7fffb0000000, 0x2000000, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, 0x3c8000000).

The memory module of business process 1 returns 0x7fffb0000000 to the business module of business process 1.

The service module of service process 1 sends a notification message to the service module of service process 3, and the parameters are 0x2000000, shared, "p1_share_1".

After the business module of business process 3 receives the message, it calls the memory module of business process 3 to apply for shared memory, for example, shm_alloc(0x2000000, shared, "p1_share_1").

According to the applied name "p1_share_1", the memory module of business process 3 determines that the physical memory of the memory area corresponding to the name is 0x3c8000000. The virtual memory corresponding to the calculation is 0x3c8000000+0x7ffb38000000=0x7fff00000000.

The memory module of business process 3 calls munmap to release the memory space requested by Step 1, the size is 32MB, munmap (0x7fff00000000, 0x2000000).

The memory module of the business process 3 calls mmap to establish a mapping relationship between the allocated physical memory address and the virtual memory address. First open the device fd=open("/dev/mem", O_RDWR, S_IRUSR|S_IWUSR), then call mmap(0x7fff00000000, 0x2000000, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, 0x3c8000000).

The memory module of business process 3 returns 0x7fff00000000 to the business module of business process 3.

So far, a shared memory area is established between the business process and the business process 3, and the virtual address of the established shared memory area is obtained by adding the allocated physical address and the offset value determined during initialization. Business process 1 or other business processes can establish multiple shared memory areas by repeating the above steps. As shown in "Figure 4 Memory Area Map", business process 1 has established two shared memory areas, and business process 2 has established two shared memory areas. A shared memory area.

The following describes the embodiment of the device in the embodiment of the present invention.

Please refer to FIG. 5 , which is an example of a device 500 in an embodiment of the present application. The device is a terminal or a server. The device includes at least one processor and a memory, and the memory stores an operating system, and the operating system It includes at least one business process, and the at least one business process includes a first business process (business process 1) and a second business process (business process 2); the first business process includes a business module and a memory module, and the The second service process includes a service module and a memory module; those skilled in the art can understand that the structure of the device shown in FIG. It is also possible to include more or fewer components than shown, or to combine certain components, or to arrange different components.

The at least one processor is configured to run a process stored in the memory to perform the following steps:

A first memory application request is generated by the service module of the first service process, and the first memory application request includes an application memory size and a memory area identifier;

The memory module of the first business process allocates the first physical memory address from the reserved physical memory space according to the memory application request, and according to the pre-calculated offset value of the physical memory address and the virtual memory address, from the pre-calculated physical memory address Allocate a first virtual memory address corresponding to the first physical memory address in the determined virtual memory space, and the virtual memory space is determined by the physical memory space;

The memory module of the first business process is also used to establish a mapping relationship between the first virtual memory addresses corresponding to the first physical memory addresses, and to create a first shared memory area;

Obtain the application memory size and the memory area identifier through the service module of the second service process;

The first shared memory area is created by the memory module of the second service process according to the requested memory size and the memory area identifier.

Optionally, before the memory module of the first service process calculates the first virtual memory address corresponding to the first physical memory address according to the pre-calculated offset value of the physical memory address and the virtual memory address, the at least A processor is specifically configured to calculate the offset value of the physical memory address and the virtual memory address through the memory module of the first service process.

Optionally, the at least one processor is specifically configured to obtain the starting address of the physical memory space and the size of the physical memory space through the memory module of the first service process; according to the reserved physical memory space The starting address of the physical memory space and the size of the physical memory space, allocate the virtual memory space; according to the starting address of the physical memory space and the starting address of the virtual memory space, calculate the physical memory address and the virtual memory address. offset value.

Optionally, the permission is set to be inaccessible before the virtual memory address in the virtual memory space is not allocated;

After allocating the first virtual memory address corresponding to the first physical memory address from the predetermined virtual memory space, the at least one processor is further configured to use the memory module of the first service process to store the virtual memory in the virtual memory In the space, the first virtual memory address is set to be accessed only by the first service process.

Optionally, the at least one processor is specifically configured to send a notification message to the service module of the second service process through the service module of the first service process, where the notification message includes the application memory size and the requested memory size. the memory area identifier;

The at least one processor is further configured to receive the notification message through the service module of the second service process, and acquire the requested memory size and the memory area identifier.

Optionally, the at least one service process further includes a third service process, and the third service process includes a service module and a memory module;

The at least one processor is further configured to generate a second memory application request through the service module of the third service process, where the second memory application request includes an application memory size and a memory area identifier;

The at least one processor is further configured to allocate a second physical memory address from the reserved physical memory space through the memory module of the third service process according to the memory application request, and allocate a second physical memory address according to the pre-calculated physical memory address and virtual memory space. The offset value of the memory address, the second virtual memory address corresponding to the second physical memory address is allocated from a predetermined virtual memory space, and the virtual memory space is determined by the physical memory space;

The at least one processor is further configured to create a second shared memory area by establishing a mapping relationship between the second virtual memory addresses corresponding to the second physical memory addresses through the memory module of the third service process;

The at least one processor is further configured to obtain the application memory size and the memory area identifier in the second application request through the service module of the second service process;

The at least one processor is further configured to, through the memory module of the second service process, create the second shared memory area according to the size of the application memory and the memory area identifier in the second application request.

Optionally, the at least one business process further includes a fourth business process, and the fourth business process includes a business module and a memory module;

The at least one processor is also configured to run a process stored in the memory to perform the steps of:

Obtain the application memory size and the memory area identifier through the service module of the fourth service process;

The first shared memory area is created by the memory module of the fourth service process according to the requested memory size and the memory area identifier.

In the embodiment of the present application, the processor may be composed of an integrated circuit (full name in English: Integrated Circuit, abbreviation: IC), for example, may be composed of a single packaged IC, or may be composed of multiple chips connected to the same function or different functions. It is composed of packaging IC. For example, the processor may only include a central processing unit (full name in English: CentralProcessing Unit, abbreviation: CPU), or may be a GPU, a digital signal processor (full name in English: Digital SignalProcessor, abbreviation: DSP), and a communication management module. combination of control chips (such as baseband chips). In the embodiment of the present invention, the CPU may be a single computing core, or may include multiple computing cores.

As shown in FIG. 5 , in some embodiments of the present application, the device in the embodiments of the present application may further include a communication device, an input device, an output device, a peripheral interface, and a power supply, etc., which are not limited here.

Wherein, the input device is used to realize the interaction between the user and the device and/or the input of information into the device. For example, the input device may receive numerical or character information input by the user to generate signal input related to user settings or function control. In a specific embodiment of the present invention, the input device may be a touch panel, or other human-computer interaction interfaces, such as physical input keys, a microphone, etc., or other external information capturing devices, such as a camera. A touch panel, also known as a touch screen or touch screen, collects the actions of a user touching or approaching it. For example, the user uses any suitable object or accessory, such as a finger, a stylus, or an operation action on the touch panel or a position close to the touch panel, and drives the corresponding connection device according to a preset program. Optionally, the touch panel may include two parts, a touch detection device and a touch controller. The touch detection device detects a user's touch operation, converts the detected touch operation into an electrical signal, and transmits the electrical signal to the touch controller; the touch controller receives the electrical signal from the touch detection device, and transmits the electrical signal to the touch controller. It is converted into contact coordinates and sent to the processor unit. The touch controller can also receive and execute commands sent by the processing unit. In addition, the touch panel can be realized by various types such as resistive type, capacitive type, infrared (Infrared), and surface acoustic wave. In other embodiments of the present invention, the physical input keys used by the input device may include, but are not limited to, one of a physical keyboard, a function key (such as a volume control key, a switch key, etc.), a trackball, a mouse, a joystick, etc. or more. Input devices in the form of microphones can collect speech input by the user or the environment and convert them into electrical signals in the form of commands executable by the processing unit.

In some other embodiments of the present application, the input device may also be various sensor devices, such as Hall devices, for detecting the physical quantities of the device, such as force, torque, pressure, stress, position, displacement, Speed, acceleration, angle, angular velocity, number of revolutions, rotational speed, and the time when the working state changes, etc., are converted into electricity for detection and control. Some other sensor devices can also include gravity sensor, three-axis accelerometer, gyroscope, electronic compass, ambient light sensor, proximity sensor, temperature sensor, humidity sensor, pressure sensor, heart rate sensor, fingerprint reader, etc.

Output devices include but are not limited to video output devices and audio output devices. The video output device is used to output text, pictures and/or video. The image output device may include a display panel, such as LCD (Liquid Crystal Display, liquid crystal display), OLED (Organic Light-Emitting Diode, organic light-emitting diode), field emission display (English full name: field emission display, abbreviation: FED), etc. form to configure the display panel. Alternatively, the image output device may include a reflective display, such as an electrophoretic display, or a display using Interferometric Modulation of Light. The image output device may comprise a single display or multiple displays of different sizes. In a specific embodiment of the present invention, the touch panel used in the above-mentioned input device can also be used as a display panel of the output device at the same time. For example, when the touch panel detects a touch or an approaching gesture operation on it, it is transmitted to the processing unit to determine the type of the touch event, and then the processing unit provides corresponding visual output on the display panel according to the type of the touch event. Although in FIG. 5, the input device and the output device are used as two independent components to realize the input and output functions of the device, in some embodiments, the touch panel and the display panel can be integrated to realize the Describe the input and output functions of the device. For example, the image output device can display various graphical user interfaces (English full name: Graphical User Interface, abbreviation: GUI) as virtual control components, including but not limited to windows, scrolling scrolls, icons and scrapbooks for The user operates by touch.

In a specific embodiment of the present invention, the image output device includes a filter and an amplifier for filtering and amplifying the video output by the processing unit. The audio output device includes a digital-to-analog converter for converting the audio signal output from the processing unit from a digital format to an analog format.

The communication device can be used to establish a communication channel, so that the device can perform voice communication, text communication and data communication with a remote electronic device or a server through the communication channel. The communication device may include communication modules such as a wireless local area network (full name in English: Wireless Local Area Network, abbreviation: WLAN) module, a Bluetooth module, a base band (Base Band) module, and a radio frequency (full name in English: Radio Frequency) corresponding to the communication module. , Abbreviation: RF) circuit for wireless local area network communication, Bluetooth communication, infrared communication and/or cellular communication system communication, such as wideband code division multiple access (English full name: Wideband Code Division Multiple Access, abbreviation: WCDMA) And/or high-speed downlink packet access (full name in English: High Speed Downlink Packet Access, abbreviation: HSDPA). The communication module is used to control the communication of each component in the device, and can support direct memory access (Direct Memory Access).

In different embodiments of the present invention, various communication modules in the communication device generally appear in the form of integrated circuit chips (Integrated Circuit Chip), and can be selectively combined, instead of including all communication modules and corresponding antennas Group. For example, the communication device may only include a baseband chip, a radio frequency chip, and a corresponding antenna to provide communication functions in a cellular communication system. Via a wireless communication connection established by the communication device, such as wireless local area network access or WCDMA access, the device can be connected to a cellular network (Cellular Network) or the Internet (Internet).

The radio frequency circuit is used to receive and transmit signals during information transmission and reception or during a call. For example, after the downlink information of the base station is received, it is processed by the processing unit; in addition, the data of the designed uplink is sent to the base station. Typically, the radio frequency circuits include well-known circuits for performing these functions, including but not limited to antenna systems, radio frequency transceivers, one or more amplifiers, tuners, one or more oscillators, digital signal processors, codecs (Codec) Chipset, Subscriber Identity Module (SIM) card, memory, etc. In addition, radio frequency circuits can also communicate with networks and other devices through wireless communication. The wireless communication can use any communication standard or protocol, including but not limited to GSM (Global System of Mobilecommunication, Global System for Mobile Communications), GPRS (General Packet Radio Service, General Packet Radio Service), CDMA (Code Division Multiple Access, Code Division Multiple Access), WCDMA (Wideband CodeDivision Multiple Access, Wideband Code Division Multiple Access), High Speed Downlink Packet Access (HSDPA), LTE (Long Term Evolution, Long Term Evolution), email, SMS (Short Messaging Service, short message service) and so on.

Embodiments of the present invention further provide a computer storage medium, wherein the computer storage medium may store a program, and when the program is executed, the program includes at least some or all of the steps of the method for mapping memory addresses described in the above method embodiments.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, in the above embodiments, the description of each embodiment has its own emphasis. A description of the example.

It should be noted that, for the sake of simple description, the foregoing method embodiments are all expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. As in accordance with the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, removable hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions described in the embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (15)

1. A mapping method of a memory address is applied to a target device, wherein the target device is a terminal or a server, an operating system is installed in the target device, the operating system includes at least one service process, the at least one service process includes a first service process and a second service process, and the method includes:

generating a first memory application request through the first service process, wherein the first memory application request comprises an application memory size and a memory area identifier;

allocating a first physical memory address from a reserved physical memory space through the first service process according to the memory application request, and allocating a first virtual memory address corresponding to the first physical memory address from a predetermined virtual memory space according to a pre-calculated physical memory address and an offset value of the virtual memory address, wherein the virtual memory space is determined through the physical memory space, and the offset value is used as a reference value calculated between the physical memory address and the virtual memory address;

establishing a mapping relation between first virtual memory addresses corresponding to the first physical memory addresses through the first service process, and establishing a first shared memory area;

acquiring the applied memory size and the memory area identifier through the second service process;

and creating the first shared memory area according to the applied memory size and the memory area identifier through the second service process.

2. The method of claim 1, wherein before the calculating a first virtual memory address corresponding to the first physical memory address according to the pre-calculated offset values of the physical memory address and the virtual memory address, the method further comprises:

offset values for the physical memory address and the virtual memory address are calculated.

3. The method of claim 2, wherein calculating the offset values for the physical memory address and the virtual memory address comprises:

acquiring a starting address of the physical memory space and the size of the physical memory space;

allocating the virtual memory space according to the initial address of the reserved physical memory space and the size of the physical memory space;

and calculating the offset values of the physical memory address and the virtual memory address according to the initial address of the physical memory space and the initial address of the virtual memory space.

4. The method according to any one of claims 1 to 3, wherein the virtual memory address in the virtual memory space is set to be inaccessible until the virtual memory address is not allocated;

after allocating a first virtual memory address corresponding to the first physical memory address from a predetermined virtual memory space, the method further comprises:

and setting the first virtual memory address in the virtual memory space to be only accessed by the first business process.

5. The method according to any one of claims 1 to 3,

the obtaining the application memory size and the memory area identifier through the second service process includes:

sending a notification message to the second service process through the first service process, wherein the notification message comprises the application memory size and the memory area identifier;

and receiving the notification message through the second service process to acquire the application memory size and the memory area identifier.

6. The method according to any one of claims 1 to 3,

the at least one business process further comprises a third business process, and the method further comprises:

generating a second memory application request through the third business process, wherein the second memory application request comprises the size of an application memory and a memory area identifier;

allocating a second physical memory address from the physical memory space through the third business process according to the memory application request, and allocating a second virtual memory address corresponding to the second physical memory address from the virtual memory space according to a pre-calculated offset value of the physical memory address and the virtual memory address;

establishing a mapping relation between second virtual memory addresses corresponding to the second physical memory address through the third business process, and establishing a second shared memory area;

the second service process acquires the applied memory size and the memory area identifier in the second memory application request;

and creating the second shared memory area according to the application memory size in the second memory application request and the memory area identifier through the second service process.

7. The method according to any one of claims 1 to 3,

the at least one business process further comprises a fourth business process, and the method further comprises:

acquiring the size of the applied memory and the memory area identification;

and creating the first shared memory area according to the applied memory size and the memory area identifier through the fourth service process.

8. A terminal is characterized in that the terminal comprises at least one processor and a memory, wherein an operating system is stored in the memory, the operating system comprises at least one business process, and the at least one business process comprises a first business process and a second business process; the first business process comprises a business module and a memory module, and the second business process comprises a business module and a memory module;

the at least one processor is configured to execute the processes stored in the memory to perform the steps of:

generating a first memory application request through a service module of the first service process, wherein the first memory application request comprises an application memory size and a memory area identifier;

allocating a first physical memory address from a reserved physical memory space through a memory module of the first service process according to the memory application request, and allocating a first virtual memory address corresponding to the first physical memory address from a predetermined virtual memory space according to a pre-calculated physical memory address and an offset value of the virtual memory address, wherein the virtual memory space is determined through the physical memory space, and the offset value is used as a reference value calculated between the physical memory address and the virtual memory address;

establishing a first shared memory area through the memory module of the first service process, wherein the memory module of the first service process is also used for establishing a mapping relation between first virtual memory addresses corresponding to the first physical memory addresses;

acquiring the applied memory size and the memory area identifier through a service module of the second service process;

and creating the first shared memory area through the memory module of the second service process according to the applied memory size and the memory area identifier.

9. The terminal according to claim 8, wherein the at least one processor is specifically configured to calculate the offset values of the physical memory address and the virtual memory address through the memory module of the first business process before the memory module of the first business process calculates the first virtual memory address corresponding to the first physical memory address according to the pre-calculated offset values of the physical memory address and the virtual memory address.

10. The terminal according to claim 9, wherein the at least one processor is specifically configured to obtain a starting address of the physical memory space and a size of the physical memory space through a memory module of the first service process; allocating the virtual memory space according to the initial address of the reserved physical memory space and the size of the physical memory space; and calculating the offset values of the physical memory address and the virtual memory address according to the initial address of the physical memory space and the initial address of the virtual memory space.

11. The terminal according to any one of claims 8 to 10, wherein the virtual memory address in the virtual memory space is set to be inaccessible until the virtual memory address is not allocated;

after allocating a first virtual memory address corresponding to the first physical memory address from a predetermined virtual memory space, the at least one processor is further configured to set, in the virtual memory space, the first virtual memory address to be only accessible to the first business process through a memory module of the first business process.

12. The terminal according to any of the claims 8 to 10,

the at least one processor is specifically configured to send a notification message to the service module of the second service process through the service module of the first service process, where the notification message includes the application memory size and the memory area identifier;

the at least one processor is further specifically configured to receive the notification message through the service module of the second service process, and obtain the application memory size and the memory area identifier.

13. The terminal according to any of claims 8 to 10, wherein the at least one service process further comprises a third service process, and the third service process comprises a service module and a memory module;

the at least one processor is further configured to generate a second memory application request through the service module of the third service process, where the second memory application request includes a memory size and a memory area identifier;

the at least one processor is further configured to allocate, by the memory module of the third service process, a second physical memory address from the reserved physical memory space according to the memory application request, and allocate, according to the pre-calculated physical memory address and the offset value of the virtual memory address, a second virtual memory address corresponding to the second physical memory address from the predetermined virtual memory space, where the virtual memory space is determined by the physical memory space;

the at least one processor is further configured to establish a mapping relationship between second virtual memory addresses corresponding to the second physical memory address through a memory module of the third service process, and establish a second shared memory area;

the at least one processor is further configured to obtain, through the service module of the second service process, the memory application size and the memory area identifier in the second memory application request;

the at least one processor is further configured to create the second shared memory area through the memory module of the second service process according to the application memory size in the second memory application request and the memory area identifier.

14. The terminal according to any of claims 8 to 10, wherein the at least one service process further comprises a fourth service process, and the fourth service process comprises a service module and a memory module;

the at least one processor is further configured to execute the processes stored in the memory to perform the steps of:

acquiring the applied memory size and the memory area identifier through a service module of the fourth service process;

and creating the first shared memory area through the memory module of the fourth service process according to the applied memory size and the memory area identifier.

15. A server is characterized in that the server comprises at least one processor and a memory, wherein an operating system is stored in the memory, the operating system comprises at least one business process, and the at least one business process comprises a first business process and a second business process; the first business process comprises a business module and a memory module, and the second business process comprises a business module and a memory module;

the at least one processor is configured to execute the processes stored in the memory to perform the steps of:

generating a first memory application request through a service module of the first service process, wherein the first memory application request comprises an application memory size and a memory area identifier;

allocating a first physical memory address from a reserved physical memory space through a memory module of the first service process according to the memory application request, and allocating a first virtual memory address corresponding to the first physical memory address from a predetermined virtual memory space according to a pre-calculated physical memory address and an offset value of the virtual memory address, wherein the virtual memory space is determined through the physical memory space, and the offset value is used as a reference value calculated between the physical memory address and the virtual memory address;

establishing a first shared memory area through the memory module of the first service process, wherein the memory module of the first service process is also used for establishing a mapping relation between first virtual memory addresses corresponding to the first physical memory addresses;

acquiring the applied memory size and the memory area identifier through a service module of the second service process;

and creating the first shared memory area through the memory module of the second service process according to the applied memory size and the memory area identifier.

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