Question

问题说明：

我在SystemVerilog中设计并使用相同的语言编写测试平台。我希望能够在模拟过程中编译我的设计和测试不同的功能，就像你使用带e的解释器一样。理想情况下，当模拟器撞到某条线时，我会在模拟时弹出一个终端弹出。

潜在想法：

我看过DPI-C，似乎我必须＆＃34;导出＆＃34;我的项目中的所有任务，以便从解释器运行它们。但是，我不确定如何自动执行此操作，或者是否有更好的方法。此外，我不知道如何让C为我打开第二个shell来输入SystemVerilog（我想要运行）。

这是一个问题与我的同事相呼应，并且在编译一个测试平台之间不必等待10分钟会让生活变得更加痛苦。

Answer 1

如何进入模拟器的交互式命令行终端。这不是典型的shell终端，例如unix。它是与供应商特定的交互模式绑定到模拟器中。在大多数情况下，它是由Verilog的$stop触发的。它是特定于供应商的，因此您需要参考手册中的所有功能，有些功能允许调用Verilog / SystemVerilog中定义的任务和功能。

听起来你不需要在一次模拟中运行所有条件。编译一次并运行许多策略应该适用于您的情况。 SystemVerilog系统函数$test$plusargs和$value$plusargs可以检测用于启动模拟的参数。请参阅IEEE Std 1800-2012§21.6命令行输入

// ...
int testid;
// ...
initial begin
  // ...
  if(!$value$pluseargs("TESTID=%d",testid)) begin
    // code if +TESTID= is not an argument
  end
  case(testid)
  0 : run_task_test0(/*...*/);
  1 : run_task_test1(/*...*/);
  2 : run_task_test2(/*...*/);
  3 : run_task_test3(/*...*/);
  // ...
  endcase
  // ...
end

然后编译一次并根据需要多次开始模拟。

% [compile-cmd]
% [sim-cmd] +TESTID=0
% [sim-cmd] +TESTID=3
% [sim-cmd] +TESTID=1
% [sim-cmd] +TESTID=2

Answer 2

嗨我用另一个例子提供我的两分钱。

实施例的 SV-CODE

＆＃13;
＆＃13;
//////////////////////////////////////////////////////////////////////// //IMPORT FUNCTION DPI DECLARATION FROM C //////////////////////////////////////////////////////////////////////// import "DPI-C" function void python_sign_msg(string key_file_name, string msg_file_name, string signed_file_name ); import "DPI-C" function string return_string_in_c(string text, inout string output_txt); typedef class keycontrol_seq_handles; //----------------------- class keycontrol_predictor#(int PARAM_PLACEHOLDER = 1) extends pve_predictor#(keycontrol_seq_handles);//extends uvm_component; ……….. ////////////////////// //USE OF DPI ////////////////////// string output_c,output2_c; output_c = return_string_in_c("This text",output2_c); python_sign_msg("file.txt","bla","blo"); endclass
＆＃13;
＆＃13;
＆＃13;

<强> C-CODE

＆＃13;
＆＃13;
//include DPI #include "svdpi.h" //include the IO files #include <stdio.h> //include string functions #include <string.h> //include use of malloc #include <stdlib.h> //include Phyton embed lib #include <Python.h> //to add the ability to use printf // same inputs as defined in SV with python path which is the defined surrounded by double quotes "" #ifndef PYTHON_PATH #error You must define the path to the python file in gcc compiler with -D 'PYTHON_PATH="'$PYTHON_DIR'"' or vlog with -ccflags "-I/usr/include/python2.6/ -D 'PYTHON_PATH=\"$PYTHON_DIR\"'" #endif /* function declaration */ void python_sign_msg( char *key_file_name, char *msg_file_name, char *signed_file_name ) { char *append_path = malloc(sizeof(char) * 1000); append_path = PYTHON_PATH":."; printf("Append to path is:\n%s\n", append_path); setenv("PYTHONPATH",append_path,1);//Set PYTHONPATH TO working directory https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.1.0/com.ibm.zos.v2r1.bpxbd00/setenv.htm char *path = Py_GetPath(); printf("Python search path is:\n%s\n", path); int argc; char * argv[2]; char *phyton_script_name = malloc(sizeof(char) * 100); phyton_script_name = "test";//don't use the .py extension here argc = 3;//argument count is 3 arguments argv[0] = phyton_script_name;//key_file_name;//"mymod";//the argument value vector is argv[1] = "4"; argv[2] = "3"; Py_Initialize();// Initialize the Python Interpreter //First import python script module name PySys_SetArgv(argc, argv);//set the previous arguments as calling arguments of the import module //PyObject* myPmodule = PyImport_ImportModule("sign_hmac-sha256");//don't put the .py extension here PyObject* myPmodule = PyImport_ImportModule(phyton_script_name);//IMPORTANT THE MAIN MODULE IS EXECUTED here with the PySys_SetArgv arguments if(myPmodule==NULL) { printf("Not able to load&execute main phyton script:\n%s\n", phyton_script_name); PyErr_Print(); } /////////////////////////////// //Extract variables through dict ////////////////////////////// //retrieve all variables and functions of the module in a namespace or dict PyObject *module_dict = PyModule_GetDict(myPmodule); char *function_name = malloc(sizeof(char) * 100); function_name = "suma";//don't use the .py extension here //getting the reference to the specific python function you want from the python script PyObject* myPfunction = PyObject_GetAttrString(myPmodule, function_name); if (PyCallable_Check(myPfunction)) { //EXAMPLE CREATE arguments in Python //PyObject* myPargs=Py_BuildValue("(z)",(char*)"something"); //PyObject* myPargs = PyTuple_Pack(1,PyFloat_FromDouble(2.0)); //ok = PyArg_ParseTuple(args, "lls", &k, &l, &s); /* Two longs and a string */ //PyObject* myPargs = Py_BuildValue("sss",key_file_name,msg_file_name,signed_file_name); /* Three strings */ //Execute the function with arguments directly //PyObject* result = PyObject_CallObject(myPfunction, (char*)"something", (char*)"something", (char*)"something");/* Three strings */ //PyObject* myPargs = Py_BuildValue("zz","4" ,"3"); PyObject* myPargs = Py_BuildValue("ii",4 ,3); PyObject* item=PyTuple_GetItem(myPargs,0);//get the item of the tuple position 0 printf("Python tuple: %d\n", (int)PyInt_AsSsize_t(item)); /*incase an integer*/ //printf("Python tuple: %s\n", PyString_AsString(item)); PyErr_Print(); PyObject* result = PyObject_CallObject(myPfunction, myPargs);//the myPargs must be always be a Pyobject PyErr_Print(); Py_DECREF(myPargs); Py_DECREF(item); Py_DECREF(result); } else { printf("The function:\n%s\n", function_name); //Pring errors comming from Python PyErr_Print(); } //////////////////////////////////////// // Clean up phase //////////////////////////////////////// Py_DECREF(myPmodule); Py_DECREF(myPfunction); Py_Finalize();// Finish the Python Interpreter } /* function declaration text char stream passed as pointer value and text2 passed as pointer reference */ char * return_string_in_c( char *text, char **text2) { char *fix="This variable cannot be changed although it is a pointer, just as example";/*fix allocation and constant*/ char dest[50]="Variable array created in a function:";/* String array max 50 chars allocated*/ char *out = malloc(sizeof(char) * 100);/* Dynamic string max 100 chars allocated*/ /* Concatenate input text and put in out of strcat*/ //strcat(out, text);/* initialize out using text string*/ snprintf(out, sizeof(char) * 100, "%s%s", out,text); printf("fix : |%s|,dest : |%s|,text : |%s|,out : |%s|\n", fix,dest,text,out); *text2=dest;/* allocate pointer value with dest*/ *text2=out;/* allocate pointer value with out*/ return out; } /* main */ void main() { char text[100]="from_main_text_variable";/*max 100 chars allocated*/ char *text2;/* pointer not allocated*/ char *point = return_string_in_c(text, &text2);/* &text2 passing by reference*/ printf("Final destination string : |%s|\n", text2); printf("point output : |%s|\n", point); printf("DEFINED PYTHON_PATH: |%s|\n", PYTHON_PATH); python_sign_msg("","",""); printf("Finished python\n"); }
＆＃13;
＆＃13;
＆＃13;

PYTHON SCRIPT - TEST.py， 删除TABS非常重要!!!!!!

＆＃13;
＆＃13;
#!/usr/bin/python # This program adds two numbers import sys if( len( sys.argv ) < 3 ) : raise( Exception( "Usage: test.py number1 number2" ) ) num1 = int(sys.argv[ 1 ]) print "sys.argv[ 1 ] : ",int(sys.argv[ 1 ]) num2 = int(sys.argv[ 2 ]) print "sys.argv[ 2 ] : ", int(sys.argv[ 2 ]) #the suma function definition def suma( arg1, arg2 ): # Add both the parameters and return them." total = arg1 + arg2; # Here total is local variable. print "Inside the function local total : ", total return total; # Display the suma print('The sum using suma function of {0} and {1} is {2}'.format(num1, num2, suma(num1,num2))) #num1 = 1.5 #num2 = 6.3 # Add two numbers sum = float(num1) + float(num2) # Display the sum print('The sum of {0} and {1} is {2}'.format(num1, num2, sum)) #a dummy function definition def multiply(): c = 12345*6789 print 'The result of 12345 x 6789 :', c return c
＆＃13;
＆＃13;
＆＃13;

最后，您必须使用供应商流程编译文件。例如，的奎斯塔 1）您使用ccflags编译C代码并引入您要添加的定义。我们的C代码需要定义PYTHON_PATH

vlog $DUT_VLOG_ARGS ${TB_DIR}/your_C_code.c -ccflags "-I/usr/include/python2.6/ -D 'PYTHON_PATH=\"$PYTHON_DIR\"'"

2）在Questa，如果你有python，你必须调用 vsim ，包括 -ldflags＆＃39; -lpython2.6＆＃39; 类似的东西：

vsim -ldflags '-lpython2.6' -voptargs="+acc" -solvefaildebug -assertdebug -onfinish stop +UVM_TESTNAME=${TESTCASE_STRING} yourtop_tb_top \

Synopsys VCS 1）您使用ccflags编译C代码并引入您要添加的定义。我们的C代码需要定义PYTHON_PATH

#GCC in two steps for shared object gcc -g -D 'PYTHON_PATH="'$PYTHON_DIR'"' -fPIC -Wall -I${VCS_HOME}/include -I/usr/include/python2.6/ -lpython2.6 -c ${PROJECTDIR}/verification/PVE/keycontrol/tb/keycontrol_C_code_wrapper.c gcc -fPIC -shared -o keycontrol_C_code_wrapper.so keycontrol_C_code_wrapper.o

2）你进行VCS阐述，将python lybrary链接到 -LDFLAGS＆＃39; -lpython2.6＆＃39;

vcs -timescale=1ps/1ps -ntb_opts uvm -lca -kdb -full64 keycontrol_tb_top -debug_access+all+reverse -LDFLAGS '-lpython2.6'

3）运行创建的模拟文件。您可以调用 simv ，包括 -sv_lib keycontrol_C_code_wrapper 来导入C共享对象。

#RUN C CODE ./simv -gui -ucli +DVE +UVM_NO_RELNOTES -l simv.log +UVM_TESTNAME=keycontrol_basic_test -do ../../verification/PVE/keycontrol/tools/keycontrol_ucli_init.synopsys -sv_lib keycontrol_C_code_wrapper

另一种工具会有另一种流程。

嵌入python是一种比python脚本中的FILE IO更高效[/ b]的解决方案。

如果您的python脚本从文件中读取输入和输出，那么从Systemverilog调用python的最简单方法就是执行系统调用。

$system("python yourscript.py filenamein filenameout ")

您当然要在systemverilog中写入您的输入文件，并在systemverilog中读取输出文件以进行比较。

Answer 3

最好的选择是使用DPI和某种脚本语言进行测试。例如，我看到这项工作很好： Python - ＆gt; Boost.Python - ＆gt; C ++ - ＆gt; DPI - ＆gt;的Verilog / SystemVerilog的

它确实限制了你在测试中可以做的事情（将它作为两种语言之间的TLM接口，即只在它们之间来回传递事务），但实际上这通常会迫使你使用好的抽象实践。阅读＆＃34; yield＆＃34;在Python中了解如何在python和模拟器之间来回传递控制。

如何使用DPI-C嵌入Systemverilog Interpreter？

3 个答案: