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vmx: nanosec(): fix non-interruptable temporary, assign fasthz only once after xstart

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cinap_lenrek 2020-12-08 13:04:52 +01:00
parent 01eb04060b
commit 4ba5cb6c6a
1 changed files with 5 additions and 4 deletions
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9
sys/src/cmd/vmx/nanosec.c
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@ -17,14 +17,15 @@ nanosec(void)
return nsec() - xstart; return nsec() - xstart;
if(fasthz == 0){ if(fasthz == 0){
if((fasthz = _tos->cyclefreq) == 0){ if(_tos->cyclefreq){
fasthz = ~0ULL; cycles(&xstart);
fasthz = _tos->cyclefreq;
} else {
xstart = nsec(); xstart = nsec();
fasthz = ~0ULL;
fprint(2, "cyclefreq not available, falling back to nsec()\n"); fprint(2, "cyclefreq not available, falling back to nsec()\n");
fprint(2, "you might want to disable aux/timesync\n"); fprint(2, "you might want to disable aux/timesync\n");
return 0; return 0;
}else{
cycles(&xstart);
} }
} }
cycles(&x); cycles(&x);