CN106354687A - Data transmission method and system - Google Patents
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- CN106354687A CN106354687A CN201610752474.0A CN201610752474A CN106354687A CN 106354687 A CN106354687 A CN 106354687A CN 201610752474 A CN201610752474 A CN 201610752474A CN 106354687 A CN106354687 A CN 106354687A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
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Abstract
The embodiment of the invention provides a method and a system for data transmission, wherein a TA layer sends a data transmission request to secure a driver layer and sends a first data stored in a first address space to a shared memory establishing a first mapping relationship with the first address space, the secure driver layer acquires the first data from the shared memory according to the received request and stores the first data in the second address space establishing a second mapping relationship with the shared memory;wherein the first mapping relationship and the second mapping relationship remain unchanged. The mapping relationship reduces the system overhead between the TA layer and the secure driver layer and improves the efficiency of communication. The method and system for data transmission relates to a field of embedded technology.
Description
Technical field
The present invention relates to field of embedded technology, more particularly, to a kind of data transmission method and system.
Background technology
In order to add safety control it is ensured that product is not subject to outward in the software and hardware of embedded product and physical characteristics design
Portion's malicious attack, reduced instruction chip (arm, advanced reduced instruction set computing
Machines) different mode of operations are provided, comprising: general mode (normal world) and safe mode (secure
world).Under normal world, can be with the operating system (for example: Android system) of normal operation use, in secure
Under world, the related system program of data safety can be safeguarded.The secure world that trustonic company is directed to arm provides
Tee (trusted execution environments, credible performing environment) solution: t-base solution.
T-base may be considered the ease of Use system operating under arm secure world, and this system can be divided into
Two-layer, trusted application layer (ta, trusted application) and safety drive layer (secure driver).Wherein,
Secure driver layer region be directly facing hardware operation positioned at bottom, and because this layer runs on secure world, it is hard that it operates
Part resource is inoperable for normal world, and this is the hardware protection mechanism that arm itself provides, and ta layer is upper
Layer application layer, the interface being based primarily upon secure driver offer completes software logic operation, this working mechanism with linux
Similar: underlying load mechanism, strategy is responsible on upper strata.
Below, the working method of ta layer and secure driver layer is illustrated taking fingerprint chip as a example.Fingerprint chip
It is considered that being belonging to be related to the hardware resource of data safety, may be located under secure world, by secure driver
Layer is directly operated, and provides related read-write interface for ta layer, realizes fingerprint chip algorithm logical correlation operations, example by ta layer
As: ta layer obtains finger print data by secure driver layer, carries out algorithm process, completes fingerprint matching etc., afterwards by ta layer
The result whether fingerprint is mated sends normal world to.
From above-mentioned flow process, when operating to the hardware resource under secure world, ta layer and secure
Driver layer needs frequently to be interacted.In prior art, the way that ta layer and secure driver layer interact includes:
Ta layer has one piece of data segment in the address space of oneself, and this data segment is mainly used in storing the order or right that ta layer will send
Parameter answered etc., when needing with the interaction of secure driver layer, ta layer can send interprocess communication (ipc, an inter-
Process communication) to ask to secure driver layer, secure driver layer receives this ipc and asks it
Afterwards, using t-base provide interface by ta layer address space store order or the data segment integral shift of parameter arrives
In the address space of secure driver layer, and order that this is stored or Parameter analysis of electrochemical, complete to operate accordingly.
For some hardware under secure world, during use, ta layer and secure driver layer need frequently to interact,
For example: the fingerprint chip that some producers provide, need frequently to carry out depositor setting and adopt figure function to execute, and interact every time
Ta layer and secure driver layer will carry out respective virtual address distribution and the mapping with shared contents reason address, no
But overhead is big, and communication efficiency also can reduce, and so that hardware is used time-consuming oversize.
Content of the invention
Embodiments provide a kind of data transmission method and system, in order to solve existing ta layer and secure
The problem that the overhead that the interactive mode of driver layer leads to is big and communication efficiency is low.
Based on the problems referred to above, a kind of data transmission method provided in an embodiment of the present invention, comprising:
Trusted application layer drives layer to send the request of data transfer to safety；
Described trusted application layer will be stored in the first data is activation in the first address space of trusted application layer to institute
State the shared drive that the first address space establishes the first mapping relations；
Described safety drives layer to obtain described first data from described shared drive according to described request, and by described the
One data storage drives the second address space of layer to the described safety establishing the second mapping relations with described shared drive；
Wherein, described first mapping relations and described second mapping relations keep constant.
The data transmission method that the present invention provides, also includes:
Described safety drives the second data is activation extremely described shared drive that layer will be stored in described second address space, its
In, described second data is according to described first data genaration；
Described safety drives layer to send the response message for described request to described trusted application layer；
Described trusted application layer obtains described second data according to described response message from described shared drive, and by institute
State the second data storage to described first address space.
Wherein, described first address space keeps constant in the life cycle of described trusted application layer, described second ground
Location space keeps constant in the life cycle that described safety drives layer.
Further, the first data that described trusted application layer will be stored in the first address space of trusted application layer is sent out
Deliver to before establishing the shared drive of the first mapping relations with described first address space, also include:
When trusted application layer drives, to described safety, the request that layer sends data transfer, described trusted application layer will be initial
Data storage is in first address space in described trusted application layer address space；By described first Address space mappinD to physics
Internal memory, obtains the shared drive of physical memory；
When described safety drives layer to receive described request, described shared drive is mapped to described safety and drives layer
Address space, obtains the second address space；
Described safety drives layer that the described primary data obtaining from described shared drive is stored in described second address
Space.
Further, the inventive method can also include: improves the running frequency of described shared drive.
The embodiment of the present invention also provides a kind of data transmission system, comprising:
Trusted application layer, for driving layer to send the request of data transfer to safety；And will be stored in described credible should
Extremely establish being total to of the first mapping relations with the first data is activation in the first address space of layer with described first address space
Enjoy internal memory；
Safety drives layer, for described first data is obtained from described shared drive according to described request, and will be described
First data storage drives the second address space of layer to the described safety establishing the second mapping relations with described shared drive；
Wherein, described first mapping relations and described second mapping relations keep constant.
Further, described safety drives layer, is additionally operable to will be stored in the second data is activation of described second address space
To described shared drive, wherein, described second data is according to described first data genaration；And send to described trusted application layer
Response message for described request；
Described trusted application layer, is additionally operable to obtain described second number from described shared drive according to described response message
According to, and by described second data storage to described first address space.
Further, described trusted application layer, is additionally operable in the first address space that will be stored in trusted application layer
Before first data is activation extremely establishes the shared drive of the first mapping relations with described first address space, when to described safety
When driving the request that layer sends data transfer, primary data is stored in described first address space；By described first address
Space reflection, to physical memory, obtains the shared drive of physical memory；
Described safety drives layer, is additionally operable to upon receipt of the request, described shared drive be mapped to described safety
Drive the address space of layer, obtain the second address space；And the described primary data obtaining from described shared drive is deposited
It is stored in described second address space.
Described system also includes frequency adjustment interface, for adjusting the running frequency of described shared drive.
The beneficial effect of the embodiment of the present invention includes:
A kind of data transmission method provided in an embodiment of the present invention and system, ta layer sends number to secure driver layer
According to transmission request, and the first data is activation of storage and own first address space is established first as the first address space
In the shared drive of mapping relations, secure driver layer, according to the request receiving, obtains the first number from shared drive
According to, and by the first data storage to the second address space establishing the second mapping relations with shared drive；Wherein, the first mapping
Relation and the second mapping relations keep constant.It can be seen that, in data transmission method provided in an embodiment of the present invention, ta layer and secure
Driver layer is assigned with the first address space and the second address space respectively in the address space of oneself, and respectively with physics in
The shared drive deposited is mapped, and mapping relations keep constant, every with ta layer in prior art and secure driver layer
Secondary interaction will be respectively allocated address space and every time interaction will set up mapping relations phase with the shared drive of physical memory
The address space that the data being transmission than, ta layer and secure driver layer is respectively allocated keeps constant, then the address of distribution
The mapping relations that space and shared drive are set up respectively can also keep constant, and ta layer and secure driver layer interact every time
When, shared drive is carried out operated just permissible by fixing address space respectively it is not necessary to interaction all distributes address every time
Space and foundation and the mapping relations of shared drive, reduce the overhead of the interaction of ta layer and secure driver layer,
Improve communication efficiency, for the hardware under secure driver layer, also reduce the overhead when using, accelerate
The response speed of hardware.
Brief description
Fig. 1 is that the structure of the t-base system comprising ta layer and secure driver layer provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is a kind of schematic flow sheet of data transmission method provided in an embodiment of the present invention；
Fig. 3 is the schematic flow sheet of another kind data transmission method provided in an embodiment of the present invention；
Fig. 4 is a kind of structural representation of data transmission system provided in an embodiment of the present invention.
Specific embodiment
Embodiments provide a kind of data transmission method and system, below in conjunction with Figure of description to the present invention's
Preferred embodiment illustrates it will be appreciated that preferred embodiment described herein is merely to illustrate and explains the present invention, not
For limiting the present invention.And in the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutual
Combination.
Fig. 1 is the t-base system comprising ta layer 101 and secure driver layer 102 provided in an embodiment of the present invention
Structural representation.
The embodiment of the present invention provides a kind of data transmission method, as shown in Figure 2, comprising:
S201, trusted application layer 101 drive layer 102 to send the request of data transfer to safety.
When being embodied as, safety drives layer 102 can open a wait thread after start-up, for waiting credible answering
With the request of layer 101, when trusted application layer 101 drives layer 102 to send data transfer request to safety, this wait thread is with regard to energy
Enough receive.
Further, in this step, data transfer request can be that (inter-process communication, enters ipc
Communicate between journey) request.
S202, trusted application layer 101 will be stored in the first data is activation in the first address space of trusted application layer 101
To the shared drive establishing the first mapping relations with the first address space.
Process can be assigned the address space of oneself when running, can not be empty by directly accessing the address of other side between process
Between realize being in communication with each other, but need special interprocess communication mode, for example: communicated by shared drive.Therefore, may be used
Letter application layer 101 and safety drive the address space that can not directly access other side when carrying out data transmission between layer 102, but need
Shared drive to be passed through.
In prior art, when carrying out data transmission every time, need to interact in each ta layer and secure driver layer
When, ta layer all can need the data application storage address of transmission, and the void that application is arrived for this in the address space of oneself
Intend address to be mapped with the physical address of shared drive, equally, the ta getting layer is being stored by secure driver layer
Data-moving to before the address space of oneself, the data application storage that can be all also this acquisition in the address space of oneself
Location, and by application to virtual address mapped with the physical address of shared drive.That is, every data transfer will
Carry out the process of " application virtual address space-virtual address space is mapped to physical space ", result in overhead greatly, lead to
Letter efficiency reduces.Therefore, in the embodiment of the present invention, the first address space, and the thing of the first address space and shared drive are made
The first mapping relations between reason address keep constant so that when subsequently carrying out data transmission, not needing to redistribute ground again
Location space, and again being mapped for address space, but direct using have built up dedicated for data storage the
One address space, the second address space and there are the first mapping relations and this second location with respectively at this first address space
Space has the shared drive of the second mapping relations, which reduces overhead, improves communication efficiency.
S203, safety drive layer 102 to obtain the first data from shared drive according to the request in s201, and first is counted
According to the second address space storing to the safety driving layer establishing the second mapping relations with shared drive；Wherein, the first mapping
Relation and the second mapping relations keep constant.
In prior art, safety drives layer 102 every time when the physical address of shared drive gets data, needs also exist for
The address space of oneself is data applied address space, and sets up between the physical address of shared drive and this address space
Mapping relations, then in the address space that data Cun Chudao getting is applied for, overhead is big, and communication efficiency is low, this
In inventive embodiments, make the second address space of specialized user data storage, and the thing of the second address space and shared drive
Mapping relations between reason address keep constant so that when subsequently carrying out data transmission, not needing to redistribute the second ground again
Location space, and re-start address of cache, but directly using the second mapping relations having built up, which reduce system
Expense, improves communication efficiency.
Below in conjunction with the accompanying drawings, it is described in detail with the method and system that specific embodiment provides to the present invention.
Embodiment 1:
In the embodiment of the present invention 1, there is provided a kind of data transmission method, as shown in figure 3, specifically including following steps:
S301, when trusted application layer 101 to safety drive layer 102 send data transfer request when, trusted application layer 101
Primary data is stored in the first address space of trusted application layer 101.
S302, trusted application layer 101, by the first Address space mappinD to physical memory, obtain the shared interior of physical memory
Deposit.
S303, when safety drive layer 102 receive the request in s301 when, by shared drive map to safety drive layer
102 address space, obtains the second address space.
S304, safety drive layer 102 that the primary data obtaining from shared drive is stored in the second address space.
Also include in this embodiment scheme for trusted application layer 101 and safety drive layer 102 respectively with physical memory
Shared drive sets up the process of mapping relations.
Specifically, in the life cycle of trusted application layer 101, need first to drive layer 102 to send data biography to safety
During defeated request, primary data waiting for transmission (can be order, parameter etc.) can be stored in the first address space of distribution,
And trigger the first mapping relations setting up between the first address space and the physical address of shared drive, obtain being total to of physical memory
Enjoy internal memory；Drive in the life cycle of layer 102 in safety, receive the data transfer request of trusted application layer 101 transmission first
When, the second mapping relations set up between shared drive and the address space of safety driving layer 102 can be triggered, that is, obtain second
Address space, and the primary data that will be stored in shared drive stores the second address space.
Further, the first address space keeps constant in the life cycle of trusted application layer 101, the second address space
Drive in the life cycle of layer 102 in safety and keep constant.That is, driving layer in follow-up trusted application layer 101 and safety
In 102 data transmission procedure, the first mapping relations and the second mapping relations keep constant, are no longer that the data of transmission is carried out
The distribution of new address space, and the mapping of new address space and shared drive, and reuse the allocated address
Space and the mapping relations having built up, so not only save overhead, also improve data transmission efficiency.It can be seen that, step
S301～step s304 can execute once, and subsequently carrying out data transmission every time can be with execution step s305～s310.
Further, trusted application layer 101 and safety drive and can be understood as the life cycle of layer 102 opening from corresponding program
Dynamic operation (restarting operation etc. after including starting up's operation or EP (end of program)), terminates to corresponding normal program operation,
Or mistake occurs in running force to terminate.
S305, trusted application layer 101 drive layer 102 to send the request of data transfer to safety.
Step s305 does not have strict sequencing that is to say, that completing with the execution of step s303～step s304
After first address space and the mapping first of shared drive, (i.e. after the execution of step s302) can execution step s305.
S306, trusted application layer 101 will be stored in the first data is activation in the first address space of trusted application layer 101
To the shared drive establishing the first mapping relations with the first address space.
S307, safety drive layer 102 to obtain the first data from shared drive according to the request in s305, and first is counted
According to the second address space storing to the safety driving layer establishing the second mapping relations with shared drive；Wherein, the first mapping
Relation and the second mapping relations keep constant.
Further, can be trusted application layer 101 before step s305～step s307 and safety drives layer 102 respectively
Establish mapping relations with shared drive, the step carrying out data transmission by the constant mapping relations of this holding.First data
Can be order, parameter etc..
S308, safe the second data is activation driving layer 102 to will be stored in the second address space to shared drive, wherein,
Second data is according to the first data genaration.
S309, safety drive layer 102 to send the response message for request in s305 to trusted application layer 101.
S310, trusted application layer 101 obtain the second data according to the response message in s309 from shared drive, and by
Two data storages are to the first address space.
Further, step s308～step s310 can be when safety drives layer 102 to receive 101, trusted application layer
After the first data sent, need the first data is carried out response and send execution during the second data, for not needing to send second
The situation of data, can not execution step s308～step s310.
In step s308～step s310, safety drives layer 102 second data can be first stored in the second address space,
Mapping relations between the second address space based on foundation and shared drive, by the second data is activation to shared drive.And
Send response message to trusted application layer 101, to point out trusted application layer 101 to obtain the second data, trusted application layer 101 is based on
Mapping relations between the first address space of foundation and shared drive, obtain the second data from shared drive, and store
To the first address space.
It can be seen that, trusted application layer 101 and safety drive layer 102 to complete leading between process by way of shared drive
Letter, and by the mapping relations between the fixing address space from the data distribution as transmission and shared drive, make data
The procedures system expense of transmission is little, improves efficiency of transmission.
The running frequency of shared drive, such internal memory speed of service in order to improve efficiency of transmission further, can also be improved
Faster, the time of trusted application layer 101 and safety driving layer 102 communication consumption is fewer.When being embodied as, it is possible to use system carries
For interface internal memory is locked into higher running frequency, repeat no more here.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of data transmission system, by these system institutes
The principle of solve problem is similar to aforementioned data transmission method, and the enforcement of therefore this system may refer to the enforcement of preceding method,
Repeat no more in place of repetition.
A kind of data transmission system provided in an embodiment of the present invention, as shown in Figure 4, comprising:
Trusted application layer 401, for driving layer 402 to send the request of data transfer to safety；And will be stored in credible
The first data is activation in first address space of application layer 401 extremely establishes the first mapping relations with described first address space
Shared drive；
Safety drives layer 402, for obtaining described first data from described shared drive according to described request, and by institute
Stating the first data storage to the safety establishing the second mapping relations with described shared drive drives the second address of layer 402 empty
Between；Wherein, described first mapping relations and described second mapping relations keep constant.
Further, safety drives layer 402, is additionally operable to will be stored in the second data is activation of described second address space extremely
Described shared drive, wherein, described second data is according to described first data genaration；And send pin to trusted application layer 401
Response message to described request；
Trusted application layer 401, is additionally operable to obtain described second data from described shared drive according to described response message,
And by described second data storage to described first address space.
Further, described first address space keeps constant in the life cycle of trusted application layer 401, and described second
Address space drives in the life cycle of layer 402 in safety and keeps constant.
Further, trusted application layer 401, is additionally operable in the first address space that will be stored in trusted application layer 401
The first data is activation to before establishing the shared drive of the first mapping relations with described first address space, when to described peace
During the full request driving layer 402 to send data transfer, primary data is stored in described first address space；By described first
Address space mappinD, to physical memory, obtains the shared drive of physical memory；
Safety drives layer 402, is additionally operable to upon receipt of the request, described shared drive be mapped to described safety and drives
The address space of dynamic layer, obtains the second address space；And the described primary data obtaining from described shared drive is stored
In described second address space.
Further, described system, also includes: frequency adjustment interface 403, for adjusting the running frequency of shared drive；
The function of above-mentioned each interface may correspond to the respective handling step in flow process shown in Fig. 2 to Fig. 3, and here is no longer superfluous
State.
Through the above description of the embodiments, those skilled in the art can be understood that the embodiment of the present invention
Can be realized by hardware it is also possible to realize by by way of software plus necessary general hardware platform.Based on such reason
Solution, the technical scheme of the embodiment of the present invention can be embodied in the form of software product, and this software product can be stored in one
In individual non-volatile memory medium (can be cd-rom, u disk, portable hard drive etc.), including some instructions with so that a meter
Calculate machine equipment (can be personal computer, server, or network equipment etc.) and execute the side described in each embodiment of the present invention
Method.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or stream
Journey is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that module in device in embodiment can be carried out point according to embodiment description
It is distributed in the device of embodiment and be disposed other than in one or more devices of the present embodiment it is also possible to carry out respective change.On
The module stating embodiment can merge into a module it is also possible to be further split into multiple submodule.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprise these changes and modification.
Claims (10)
1. a kind of data transmission method is it is characterised in that include:
Trusted application layer drives layer to send the request of data transfer to safety；
Described trusted application layer will be stored in the first data is activation in the first address space of trusted application layer to described the
One address space establishes the shared drive of the first mapping relations；
Described safety drives layer to obtain described first data from described shared drive according to described request, and described first is counted
According to the second address space storing to the described safety driving layer establishing the second mapping relations with described shared drive；
Wherein, described first mapping relations and described second mapping relations keep constant.
2. the method for claim 1 is it is characterised in that also include:
Described safety drives the second data is activation extremely described shared drive that layer will be stored in described second address space, wherein,
Described second data is according to described first data genaration；
Described safety drives layer to send the response message for described request to described trusted application layer；
Described trusted application layer obtains described second data according to described response message from described shared drive, and by described
Two data storages are to described first address space.
3. method as claimed in claim 1 or 2 is it is characterised in that described first address space is in described trusted application layer
Keep constant in life cycle, described second address space keeps constant in the life cycle that described safety drives layer.
4. method as claimed in claim 3 is it is characterised in that described trusted application layer will be stored in the first of trusted application layer
Before the first data is activation in address space extremely establishes the shared drive of the first mapping relations with described first address space,
Also include:
When trusted application layer drives, to described safety, the request that layer sends data transfer, described trusted application layer is by primary data
It is stored in first address space in described trusted application layer address space；By described first Address space mappinD to physics
Deposit, obtain the shared drive of physical memory；
When described safety drives layer to receive described request, described shared drive is mapped to the address that described safety drives layer
Space, obtains the second address space；
Described safety drives layer that the described primary data obtaining from described shared drive is stored in described second address space.
5. the method as described in any one of Claims 1-4 is it is characterised in that also include:
Improve the running frequency of described shared drive.
6. a kind of data transmission system is it is characterised in that include:
Trusted application layer, for driving layer to send the request of data transfer to safety；And will be stored in described trusted application layer
The first address space in the first data is activation to described first address space establish the first mapping relations shared in
Deposit；
Safety drives layer, for obtaining described first data from described shared drive according to described request, and by described first
Data storage drives the second address space of layer to the described safety establishing the second mapping relations with described shared drive；
Wherein, described first mapping relations and described second mapping relations keep constant.
7. system as claimed in claim 6, it is characterised in that described safety drives layer, is additionally operable to will be stored in described second
, to described shared drive, wherein, described second data is according to described first data genaration for second data is activation of address space；With
And send the response message for described request to described trusted application layer；
Described trusted application layer, is additionally operable to obtain described second data from described shared drive according to described response message, and
By described second data storage to described first address space.
8. system as claimed in claims 6 or 7 is it is characterised in that described first address space is in described trusted application layer
Keep constant in life cycle, described second address space keeps constant in the life cycle that described safety drives layer.
9. system as claimed in claim 8, it is characterised in that described trusted application layer, is additionally operable to will be stored in credible answering
Extremely establish being total to of the first mapping relations with the first data is activation in the first address space of layer with described first address space
Before enjoying internal memory, when driving, to described safety, the request that layer sends data transfer, primary data is stored in described first ground
In the space of location；By described first Address space mappinD to physical memory, obtain the shared drive of physical memory；
Described safety drives layer, is additionally operable to upon receipt of the request, described shared drive be mapped to described safety and drives
The address space of layer, obtains the second address space；And the described primary data obtaining from described shared drive is stored in
Described second address space.
10. the system as described in any one of claim 6 to 9 is it is characterised in that also include: frequency adjustment interface, for adjusting
The running frequency of described shared drive.
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