1 // Copyright 2012 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package runtime 6 7 var hardDiv bool // TODO: set if a hardware divider is available 8 9 func checkgoarm() { 10 // TODO(minux): FP checks like in os_linux_arm.go. 11 12 // osinit not called yet, so ncpu not set: must use getncpu directly. 13 if getncpu() > 1 && goarm < 7 { 14 print("runtime: this system has multiple CPUs and must use\n") 15 print("atomic synchronization instructions. Recompile using GOARM=7.\n") 16 exit(1) 17 } 18 } 19 20 //go:nosplit 21 func cputicks() int64 { 22 // Currently cputicks() is used in blocking profiler and to seed runtimefastrand(). 23 // runtimenanotime() is a poor approximation of CPU ticks that is enough for the profiler. 24 // TODO: need more entropy to better seed fastrand. 25 return nanotime() 26 } 27
