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// OpenSPARC T2 Processor File: niu_seeding.vri
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#include "niu_plusArgMacros.vri"
#define MAXINT 2147483647
//-----------------------------------------------------------------------------
// You must seed the random number generators from the vera program file
// (*top.vr) *BEFORE* class instantiations and forks. YES, this matters
// in vera > V5, see vera docs. If you don't seed before instantiating a
// class, that class ALWAYS repeats the same random numbers which is NOT
// what you want. (you have been warned :^))
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// NOTE: random() always returns a positive integer. bit 31 ALWAYS ZERO.
// urandom() always returns a unsigned integer. bit 31 ALWAYS RANDOM.
// If you do myInt = urandom(); you will get a negetive integer 50% of the time!
// If you do myReg[31:0] = random(); you will always have [31] = 0.
//-----------------------------------------------------------------------------
reg [31:0] seedingtmpseed = 0;
string gTestNameAsm, gTestNameVera, gAltTestname;
reg [1024:0] gTestNameAsm, gTestNameVera, gAltTestname;
#define HDNLNAME gSeedFileHndl
mGetPlusargDec(tg_seed=,seedingtmpseed);
if (seedingtmpseed[31]) {
seedingtmpseed[31] = 0; // don't want negative integer
printf("SEED---> sims +tg_seed: was modified to not be a negative integer\n");
if( get_plus_arg(CHECK,"NIU_RANDOM")) {
SEEDNAME = seedingtmpseed; // cast reg to positive integer
printf("SEED---> sims +tg_seed: %d", SEEDNAME);
// NOTE: use sims -tg_seed= to pass in a seed.
// DO NOT use sims -vcs_run_args=+tg_seed=, it will not work!
if (mChkPlusarg(vera_diag_name=)) mGetPlusargStr(vera_diag_name=,gTestNameVera);
if (mChkPlusarg(asm_diag_name=)) mGetPlusargStr(asm_diag_name=,gTestNameAsm);
if (mChkPlusarg(test=)) mGetPlusargStr(test=,gAltTestname);
// NOTE: random always returns a positive integer. bit 31 ALWAYS ZERO.
// urandom always returns a unsigned integer. bit 31 ALWAYS RANDOM.
// If you do myInt = urandom(); you will get a negetive integer 50% of time!
// If you do myReg[31:0] = random(); you will always have [31] = 0.
if( get_plus_arg(CHECK,"NIU_RANDOM")) {
rand48(SEEDNAME);urand48(SEEDNAME); // do not use these 48 calls
urandom(SEEDNAME);random(SEEDNAME); // not really needed but safe
srandom(SEEDNAME); // seeds main generator and random and urandom
// store the seed. Lost seeds after re-runs are a real bummer!
HDNLNAME = fopen( "./seeds.log", "a" );
printf("\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n");
printf("The %s random generators have just been seeded with %d\n", which, SEEDNAME);
printf("You need to know this SEED if you want to reproduce failures!\n");
printf("Use sims -tg_seed=%0d to reproduce this run.\n",SEEDNAME);
printf("Seed not saved to file!!! Make sure that you are the owner of seeds.log and that it has 664 protection.\n");
printf("\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n");
printf("\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n");
printf("The %s random generators have just been seeded with %d\n",which, SEEDNAME);
printf("You need to know this SEED if you want to reproduce failures!\n");
printf("Use sims -tg_seed=%0d to reproduce this run!\n",SEEDNAME);
printf("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n");
fprintf(HDNLNAME, "---------------------------------------------------------------------\n");
fprintf(HDNLNAME, "Test %s %s %s is using seed %d StartTime - ", gTestNameAsm, gTestNameVera, gAltTestname, SEEDNAME);
os_command("date >>./seeds.log");
// NOTE: 'end of test' code should update this file to indicate status,
// that way you know which seed was the failing one, which is the one
// you are looking for... I need to make a seedingEnd.vri to do that. jp
projects / OpenSPARC-T2-DV / blob