CN1825283A - Method for implementing hardware image starting optimizing of embedded operating system - Google Patents
Method for implementing hardware image starting optimizing of embedded operating system Download PDFInfo
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Abstract
The invention discloses a method for realizing hardware mirror startup optimization for embedded operating system, not directly ending running of embedded operating system but saving state of the running operating system together with microkernel of the operating system into the in-chip memory of a processor, directly loading at the time of startup and restoring to the running state saved. And it can remarkably speed up system booting and restart so as to remarkably raise startup speed of the embedded system and reduce the time for user to wait.
Description
Technical field
The present invention relates to starting of embedded operation system optimisation technique field, particularly relate to a kind of implementation method of hardware image starting optimizing of embedded operating system.
Background technology
In current embedded technology, the relation of hardware and software is more and more closer, corresponding software with hardware also is the important component part in the embedded system, and owing to ten hundreds of code in the current software is to be finished by manual the writing of people, these softwares need shield the difference of different bottom hardwares, and want to satisfy Protean application demand, so software is more complicated for hardware, the R﹠D costs that need expend are more.
Because embedded system is the system towards application-specific, therefore the hardware design of different embedded systems often varies, can not the BIOS in PC unified standardized designs be arranged, in the design of the present embedded system start-up routine of this nonstandardized technique excrescence and the transplanting work of embedded OS hardware abstraction layer, in order to reduce the duplication of labour, to enhance productivity, these work are progressively becoming the reference solution (or customize services) that standard is provided by the hardware vendor, and the manufacturer of software source code to concrete equipment is provided.
The start-up routine of embedded system generally has two functions: the one, and starting outfit is finished hardware check, for the operation of subsequent operation system is got ready; Another provides exploitation and debugging enironment, for the exploitation and the transplanting of subsequent operation system are provided convenience.Though can not need the existence of start-up routine in theory fully, and directly be responsible for startup by operating system, but in fact for the decomposition of development task, needs and some technical considerations of debugging, generally all can adopt a much smaller start-up routine of the relative operating system of size of code, and at first the start-up routine debugging be passed through with various developing instruments.
Embedded OS is a most important component in the embedded software platform, also there is a lot of simple embedded system not use operating system, but, application demand becomes increasingly complex along with becoming, along with the enhancing of people to raising development efficiency, reduction R﹠D costs and assurance system stability sexual demand, the use of operating system is more and more universal.And the operating system in the embedded system is compared in addition some unique characteristics with the operating system in the multi-purpose computer, such as many application wish that embedded OS can satisfy that certain real-time requires, configurability is good, portability is strong, has the power managed function, system stability is reliable or the like.
If only utilizing flush bonding processor and storer to calculate, computing machine left operation to various input and output (I/O) equipment, just can not obtain input signal, can not display result, can not with other computing equipment communications, can not carry out alternately with computed people, the effect that can bring into play of computing machine is just greatly inferior so.Driver is exactly the program that is used to control and visit various input-output device in the operating system, so driver is the importance parts in the built-in system software platform.In the embedded system development of reality, the kernel of operating system does not generally need to make too many modification, and the driver of each peripheral hardware is write, revised and debug in a large amount of work often at the hardware platform of uniqueness, and the technical need of this respect is huge.
Embedded system since towards the general resource-constrained of application-specific to save cost, perfect application program running environment can not be arranged as multi-purpose computer, therefore the middleware software towards Embedded Application just arises at the historic moment, these embedded middleware softwares are often carried out the efficient height, reduce and optimize for specific application, perhaps configurability is very strong.Middleware software in some typical embedded systems comprises network protocol stack, Flash File System, Java Virtual Machine, embedded database or the like.
Must finish the application software of particular task in the embedded system in addition, these software architectures are on embedded OS and middleware software, finish the corresponding calculated task at specific hsrdware requirements, be the last implementor of embedded system function, its design and application demand are closely related, the performance history of performance history and normal application software is similar, is the final tache of system design.
Hardware resource environment in the embedded system is generally relatively harsher, the internal memory of embedded microprocessor and microcontroller is generally all little, will finish complicated function under so nervous resource, it is small and exquisite, stable and efficient that this just requires that built-in system software must try one's best.In the case, as the mobile embedded type equipment user, if what face is the general general-purpose operating system, often can't stand very long start-up time, simultaneously, for embedded OS, also to shorten its start-up time as far as possible, reaching user's requirement, and become start-up time and influence the key factor that the user selects product, therefore, need to adopt new method to reduce the start-up time of embedded OS.
Summary of the invention
The object of the present invention is to provide a kind of implementation method of hardware image starting optimizing of embedded operating system.
The technical scheme that the present invention solves its technical matters employing is as follows:
1) program interrupt state-detection
1. activate finger daemon by control desk;
2. whether trace routine is in the interruption, if, the just operation of cancellation preservation;
3. set up virtual terminal;
2) preservation of mirror image
1. finish to remove the kernel state process, zombie, all process outside the current process discharges memory headroom as much as possible;
2. the notice of hanging up to the equipment transmitting system of in performance management module, having registered;
3. the numerical value that all modifications in the current C PU register is crossed deposits internal memory in, and the value of the register of the CPU under the preservation current state is in internal memory, and statistics one total what memory pages need to preserve, and memory pages is copied to zone new in the internal memory
4. lock the switching equipment during all use except that on-chip memory, the memory pages that duplicates is written to sheet internal memory devices the inside, and the address of each exchange page or leaf is preserved, and these page table directory are written to exchange partition;
5. produce the header information of mirror image, the mirror image header information is written to the exchange partition the inside, and makes all switching equipment to use;
6. shut down or restarting systems;
3) recovery of mirror image
1. starting up's kernel is finished the initialization of process and basic start-up course, and carries out some necessary conditions and detect, and determines the block size of target exchange partition;
2. create a virtual control desk;
3. whether the detection lug internal storage is the target exchange partition, reads the header information of mirror image in on-chip memory, and carries out conforming detection;
4. in internal memory, create page table directory again, read out the page table directory of preservation from the on-chip memory the inside, read the memory pages of all preservations to internal memory from creating the page table the inside;
5. the numerical value that all modifications in the current C PU register is crossed deposits internal memory in;
6. the page copy that just returns in the internal memory is arrived original position, recover the value of CPU register, discharge the page or leaf that when dormancy, distributes;
7. the notice of recovering to the equipment transmitting system of in performance management module, having registered;
8. restart the process of in preserving mirrored procedure, suspending.
The present invention compares with background technology, and the useful effect that has is:
The present invention is a kind of starting of embedded operation system optimization method based on Hardware Mirroring, its major function is that system is under the situation of the on-chip memory capacity permission of embedded type CPU inside, with respect to the outer Flash of the sheet on the external unit bus, its speed promotes significantly.
(1) high efficiency.When embedded OS was closed, kernel mirror image was kept in the on-chip memory, had made full use of the capacity of existing embedded type CPU on-chip memory, the characteristics that speed is become stronger day by day.
(2) accelerate start-up time.When starting of embedded operation system, start from the kernel mirror image that is kept on the on-chip memory, significantly accelerating system guiding and the speed that restarts reduce the time that the user waits for.
Description of drawings
Accompanying drawing is the synoptic diagram of process of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
A kind of implementation method of hardware image starting optimizing of embedded operating system, its specific implementation method is as follows:
1) program interrupt state-detection
1. after the normal startup of embedded OS, in control desk, change the systems exchange state, and then activate finger daemon by command line mode.
2. finger daemon is at first checked the variate-value whether the representative process can be hung up, if value is not 0, i.e. expression can be carried out follow-up work, next judge whether process is carried out in interruption, if not the preservation that begins system, if carry out in interruption, just mistake has taken place in explanation, just the operation of cancellation preservation.
3. set up virtual terminal, be used to show Debugging message.
2) preservation of mirror image
1. check the process status in the kernel, finish to remove the kernel state process, zombie, all process outside the current process discharges memory headroom as much as possible, to reduce the size of memory mirror; If want to discharge certain memory headroom two kinds of ways are arranged: a kind of is to wake page exchange process up, calls in more memory pages; Another method is a release physical memory pages from kernel, has so just reached the purpose that discharges memory headroom as much as possible.
2. next the driver in the embedded OS is handled the notice of hanging up to the equipment transmitting system of in performance management module, having registered.
3. embedded OS numerical value that all modifications in the current C PU register is crossed deposits internal memory in.This need notify compiler to insert an internal memory barrier, but this internal memory barrier is to hardware incapability, and the code after the compiling can deposit the numerical value that all modifications in the current C PU register is crossed in internal memory, reads from internal memory again when needing these data again.
The value of register of preserving the CPU under the current state is in internal memory, and the data that are used for preserving these values have the packing attribute, can be with its member variable compact arrangement.
Statistics one total what memory pages need to preserve, and create two hang-up page directories: " preservation page directory " and " not preserving page directory ", and memory pages copied to zone new in the internal memory.
4. lock the switching equipment during all use except that on-chip memory, the memory pages that duplicates is written to sheet internal memory devices the inside, and the address of each exchange page or leaf is preserved, and these page table directory are written to exchange partition.
5. produce the header information of mirror image, the mirror image header information is written to the exchange partition the inside, and makes all switching equipment to use.
6. shut down or restarting systems.
3) recovery of mirror image
1. after the start, start boot and load embedded operating system kernel and decompression, start kernel then up to creating initialize process.Initialize process locking kernel before loading the root file, carries out the setting on basis, loads the driver of some equipment, carries out some necessary conditions and detects, and determines the block size of target exchange partition.
2. create a virtual control desk, be used for showing Debugging message.
3. system checks at first whether the swap block that needs is empty, if not empty, obtains first page from on-chip memory, and whether the detection lug internal storage is the target exchange partition; Whether read the header information of mirror image again in the on-chip memory, whether the header information that detects mirror image is correct, and carries out conforming detection, be the system before the dormancy to determine present system, then the relevant information that is kept in the mirror image head read out;
4. next by redistributing " not preserving page directory ", obtain page directory (order when reading the order of the page in the page directory and preserving it is just in time opposite) page by page.Next assignment page catalogue in internal memory again.At last for the sake of security, the raw address of memory pages just will not conflict the address that memory pages returns to the new address of distributing, if conflict has really taken place, then redistributes, till no longer conflicting; Then read the memory pages of all preservations to internal memory from the page table the inside.
5. the numerical value that all modifications in the current C PU register is crossed deposits internal memory in.
6. the page copy that just returns in the internal memory is arrived original position, recover the value of CPU register, discharge the page or leaf that when dormancy, distributes, to guarantee the state before internal memory returns to dormancy fully.
7. the notice of recovering to the equipment transmitting system of in performance management module, having registered.
8. restart the process of in preserving mirrored procedure, suspending, thereby will be 2) 1. preserve all processes that terminate in the mirrored procedure and all return to running status.
Claims (1)
1. the implementation method of a hardware image starting optimizing of embedded operating system is characterized in that:
1) program interrupt state-detection
1. activate finger daemon by control desk;
2. whether trace routine is in the interruption, if, the just operation of cancellation preservation;
3. set up virtual terminal;
2) preservation of mirror image
1. finish to remove the kernel state process, zombie, all process outside the current process discharges memory headroom as much as possible;
2. the notice of hanging up to the equipment transmitting system of in performance management module, having registered;
3. the numerical value that all modifications in the current C PU register is crossed deposits internal memory in, and the value of the register of the CPU under the preservation current state is in internal memory, and statistics one total what memory pages need to preserve, and memory pages is copied to zone new in the internal memory;
4. lock the switching equipment during all use except that on-chip memory, the memory pages that duplicates is written to sheet internal memory devices the inside, and the address of each exchange page or leaf is preserved, and these page table directory are written to exchange partition;
5. produce the header information of mirror image, the mirror image header information is written to the exchange partition the inside, and makes all switching equipment to use;
6. shut down or restarting systems;
3) recovery of mirror image
1. starting up's kernel is finished the initialization of process and basic start-up course, and carries out some necessary conditions and detect, and determines the block size of target exchange partition;
2. create a virtual control desk;
3. whether the detection lug internal storage is the target exchange partition, reads the header information of mirror image in on-chip memory, and carries out conforming detection;
4. in internal memory, create page table directory again, read out the page table directory of preservation from the on-chip memory the inside, read the memory pages of all preservations to internal memory from creating the page table the inside;
5. the numerical value that all modifications in the current C PU register is crossed deposits internal memory in;
6. the page copy that just returns in the internal memory is arrived original position, recover the value of CPU register, discharge the page or leaf that when dormancy, distributes;
7. the notice of recovering to the equipment transmitting system of in performance management module, having registered;
8. restart the process of in preserving mirrored procedure, suspending.
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| CNB2006100501161A CN100377085C (en) | 2006-03-31 | 2006-03-31 | Method for implementing hardware image starting optimizing of embedded operating system |
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| CN116048628A (en) * | 2022-07-21 | 2023-05-02 | 荣耀终端有限公司 | Equipment starting method and electronic equipment |
| CN116048628B (en) * | 2022-07-21 | 2023-09-29 | 荣耀终端有限公司 | Equipment starting method and electronic equipment |
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