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// Copyright 2020 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 cpu_test
import (
"runtime"
"testing"
"unsafe"
"golang.org/x/sys/cpu"
)
var s390xTests = []struct {
name string
feature bool
facility uint
mandatory bool
}{
{"ZARCH", cpu.S390X.HasZARCH, 1, true},
{"STFLE", cpu.S390X.HasSTFLE, 7, true},
{"LDISP", cpu.S390X.HasLDISP, 18, true},
{"EIMM", cpu.S390X.HasEIMM, 21, true},
{"DFP", cpu.S390X.HasDFP, 42, false},
{"MSA", cpu.S390X.HasMSA, 17, false},
{"VX", cpu.S390X.HasVX, 129, false},
{"VXE", cpu.S390X.HasVXE, 135, false},
}
// bitIsSet reports whether the bit at index is set. The bit index
// is in big endian order, so bit index 0 is the leftmost bit.
func bitIsSet(bits [4]uint64, i uint) bool {
return bits[i/64]&((1<<63)>>(i%64)) != 0
}
// facilityList contains the contents of location 200 on zos.
// Bits are numbered in big endian order so the
// leftmost bit (the MSB) is at index 0.
type facilityList struct {
bits [4]uint64
}
func TestS390XVectorFacilityFeatures(t *testing.T) {
// vector-enhancements require vector facility to be enabled
if cpu.S390X.HasVXE && !cpu.S390X.HasVX {
t.Error("HasVX expected true, got false (VXE is true)")
}
}
func TestS390XMandatoryFeatures(t *testing.T) {
for _, tc := range s390xTests {
if tc.mandatory && !tc.feature {
t.Errorf("Feature %s is mandatory but is not present", tc.name)
}
}
}
func TestS390XFeatures(t *testing.T) {
if runtime.GOOS != "zos" {
return
}
// Read available facilities from address 200.
facilitiesAddress := uintptr(200)
var facilities facilityList
for i := 0; i < 4; i++ {
facilities.bits[i] = *(*uint64)(unsafe.Pointer(facilitiesAddress + uintptr(8*i)))
}
for _, tc := range s390xTests {
if want := bitIsSet(facilities.bits, tc.facility); want != tc.feature {
t.Errorf("Feature %s expected %v, got %v", tc.name, want, tc.feature)
}
}
}