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SEC 2.0 Reference Device Driver User’s Guide, Rev. 0
Freescale Semiconductor PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE 13
User Interface
scatter-composed, as opposed to direct, contiguous memory (for instance, key data could be in contiguous system
memory, while ciphertext data will be in fragmented user memory).
A problem with marking buffers using this method is that there is no means for the caller to clearly identify which
bit in
scatterBufs matches any given pointer in the request, since the data description portion of different requests
cannot be consistent or of any particular order.
A helper function,
MarkScatterBuffer(), is therefore made available by the driver to make the bit/pointer
association logic in the driver accessible to the caller. It's form is:
MarkScatterBuffer(void *request, void *buffer);
where request points to the request block being built (the opId element must be set prior to call), and buffer
points to the element within the request which references a scattered buffer. It will then mark the necessary bit in
scatterBufs that defines this buffer for this specific request type.
3.3.7.3 Direct Scatter-Gather Usage Example
In order to make this usage clear, an example is presented. Assume that a triple DES encryption operation is to be
constructed, where the input and output buffers are located in fragmented user memory, and the cipher keys and IV
are contained in system memory. A DES_LOADCTX_CRYPT_REQ is zero-allocated as encReq, and constructed:
/* set up encryption operation */
encReq.opId = DPD_TDES_CBC_CTX_ENCRYPT;
encReq.notify = notifier;
encReq.notify_on_error = notifier;
encReq.inIvBytes = 8;
encReq.keyBytes = 24;
encReq.inBytes = bufsize;
encReq.inIvData = iv;
encReq.keyData = cipherKey;
encReq.inData = (unsigned char *)input; /* this buffer is scattered */
encReq.outIvBytes = 8;
encReq.outIvData = ctx;
encReq.outData = (unsigned char *)output; /* this buffer is scattered */
MarkScatterBuffer(&encReq, &encReq.input);
MarkScatterBuffer(&encReq, &encReq.output);
Upon completion of the two mark calls, encReq.scatterBufs will have two bits set within it that the driver
knows how to interpret as meaning that the intended buffers have scatter lists defined for them, and will process
them accordingly as the DPD is built for the hardware.
- User’s Guide 1
- 2 Device Driver Components 3
- 2.1.3 Process Request Routine 4
- 3 User Interface 5
- 3.2 Error Handling 6
- 3.3 Global Definitions 7
- 3.3.4 Return Codes 8
- 3.3.5.1 STATUS_REQ Structure 10
- 4.1 Random Number Requests 14
- 4.2 DES Requests 14
- 4.3 ARC4 Requests 15
- 4.4 Hash Requests 17
- 4.5 HMAC Requests 18
- 4.6 AES Requests 19
- 4.7.1 MOD_EXP_REQ 20
- 4.7.2 MOD_SS_EXP_REQ 21
- 4.7.3 MOD_R2MODN_REQ 21
- 4.7.4 MOD_RRMODP_REQ 22
- 4.7.5 MOD_2OP_REQ 22
- 4.8 ECC Public Key Requests 24
- 4.8.2 ECC_2OP_REQ 25
- 4.8.3 ECC_SPKBUILD_REQ 26
- 4.9 IPSec Requests 27
- 4.9.2 IPSEC_ECB_REQ 29
- 4.9.3 IPSEC_AES_CBC_REQ 30
- 4.9.4 IPSEC_AES_ECB_REQ 31
- 4.9.5 IPSEC_ESP_REQ 32
- 4.10 802.11 Protocol Requests 35
- 4.11 SRTP Protocol Requests 35
- 5 Sample Code 36
- 5.2 IPSEC Sample 37
- 6Linux Environment 39
- 7 VxWorks Environment 40
- 8 Porting 41
- 8.1 Header Files 42
- 8.2 C Source Files 42
- 8.3 Interrupt Service Routine 42
- 8.4 Conditional Compilation 43
- 8.5 Debug Messaging 43
- 8.6 Distribution Archive 43
- How to Reach Us: 44
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