On tor, 2004-06-17 at 13:28, ULStudent:Denis.Lyons wrote:
Hi again,
Just resending this mail as I'm not sure if it was sent successfully last time. I desperately need some help with the following!!
Can anyone provide me with code to do the following..
I want to create a lookup table in SRAM as follows:
------------------------------------------- | packet offset | signature len | signature | N matched pkts| ------------------------------------------- | | | | -------------------------------------------
As packets arrive I want to search this table and increment the N matched packets counter if a packet contains any of the signatures in the table.
Any help will be greatly appreciated,
You could initialize your table from the core ACE component in a way similar to this pseodo code: RmMalloc(RM_SRAM, &table_handle, NO_OF_ENTRIES*SIZE_OF_ENTRY); RmGetPhysOffset(RM_SRAM, table_handle, &table_base_offset); Then you must patch a symbol to the microblock so it knows the address where it starts. strcpy(symbols[1].name, SRAM_TBL_BASE); symbols[1].value = table_base_offset; for(i = 0; i < MAX_NUM_UENG; i++) { if(((aced->ue >> i) & 0x1)) { RmUengPatchSymbols(i, symbols, POL_NUM_SYMBOLS); } } The microblock code then needs to import this symbol. The examples from Intel or Comer's wwbump shows how this is done. You simply include a .h file in both the core and microblock which look like this: #ifndef MICROCODE #define SRAM_TBL_BASE "_SRAM_TBL_BASE" #else .import_var _SRAM_TBL_BASE #endif The microblock code then use this patched value immed32[t_base, _SRAM_TBL_BASE] sram[read, $res[0], t_offset, t_base, 1], ctx_swap, optimize_mem This is not a full example, but it may give you an idea of how to start. Add you own logic and have a look at some of the example code. There are probably other ways to do it as well. I have left out error checks here.
Thanks for your time,
Hope this helps.
Denis -- Øyvind Hvamstad