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Source file src/runtime/os_netbsd_arm.go

Documentation: runtime

  // Copyright 2013 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package runtime
  
  import "unsafe"
  
  var hardDiv bool // TODO: set if a hardware divider is available
  
  func lwp_mcontext_init(mc *mcontextt, stk unsafe.Pointer, mp *m, gp *g, fn uintptr) {
  	// Machine dependent mcontext initialisation for LWP.
  	mc.__gregs[_REG_R15] = uint32(funcPC(lwp_tramp))
  	mc.__gregs[_REG_R13] = uint32(uintptr(stk))
  	mc.__gregs[_REG_R0] = uint32(uintptr(unsafe.Pointer(mp)))
  	mc.__gregs[_REG_R1] = uint32(uintptr(unsafe.Pointer(gp)))
  	mc.__gregs[_REG_R2] = uint32(fn)
  }
  
  func checkgoarm() {
  	// TODO(minux): FP checks like in os_linux_arm.go.
  
  	// osinit not called yet, so ncpu not set: must use getncpu directly.
  	if getncpu() > 1 && goarm < 7 {
  		print("runtime: this system has multiple CPUs and must use\n")
  		print("atomic synchronization instructions. Recompile using GOARM=7.\n")
  		exit(1)
  	}
  }
  
  //go:nosplit
  func cputicks() int64 {
  	// Currently cputicks() is used in blocking profiler and to seed runtime·fastrand().
  	// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
  	// TODO: need more entropy to better seed fastrand.
  	return nanotime()
  }
  

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