Enable support for deferred calls

src/gopheros/kernel/goruntime/bootstrap.go

@@ -21,6 +21,7 @@ var (
 	typeLinksInitFn      = typeLinksInit
 	itabsInitFn          = itabsInit
 	initGoPackagesFn     = initGoPackages
+	procResizeFn         = procResize
 
 	// A seed for the pseudo-random number generator used by getRandomData
 	prngSeed = 0xdeadc0de
@@ -44,6 +45,9 @@ func mallocInit()
 //go:linkname mSysStatInc runtime.mSysStatInc
 func mSysStatInc(*uint64, uintptr)
 
+//go:linkname procResize runtime.procresize
+func procResize(int32) uintptr
+
 // initGoPackages is an alias to main.init which recursively calls the init()
 // methods in all imported packages. Unless this function is called, things like
 // package errors will not be properly initialized causing various problems when
@@ -184,11 +188,20 @@ func Init() *kernel.Error {
 	typeLinksInitFn() // uses maps, activeModules
 	itabsInitFn()     // uses activeModules
 
+	// Set processor count to 1. This initializes the p pointer in the
+	// currently active m allowing the kernel to register defer functions
+	SetCPUCount(1)
+
 	initGoPackagesFn()
 
 	return nil
 }
 
+// SetCPUCount registers the number of available CPUs with the Go runtime.
+func SetCPUCount(numCPUs int32) {
+	procResizeFn(numCPUs)
+}
+
 func init() {
 	// Dummy calls so the compiler does not optimize away the functions in
 	// this file.

src/gopheros/kernel/goruntime/bootstrap_test.go

@@ -267,6 +267,7 @@ func TestInit(t *testing.T) {
 		typeLinksInitFn = typeLinksInit
 		itabsInitFn = itabsInit
 		initGoPackagesFn = initGoPackages
+		procResizeFn = procResize
 	}()
 
 	mallocInitFn = func() {}
@@ -275,7 +276,7 @@ func TestInit(t *testing.T) {
 	typeLinksInitFn = func() {}
 	itabsInitFn = func() {}
 	initGoPackagesFn = func() {}
-
+	procResizeFn = func(_ int32) uintptr { return 0 }
 	if err := Init(); err != nil {
 		t.Fatal(t)
 	}