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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cpuid
import (
"testing"
)
// These are the default values of various FeatureSet fields.
const (
defaultVendorID = "GenuineIntel"
// These processor signature defaults are derived from the values
// listed in Intel Application Note 485 for i7/Xeon processors.
defaultExtFamily uint8 = 0
defaultExtModel uint8 = 1
defaultType uint8 = 0
defaultFamily uint8 = 0x06
defaultModel uint8 = 0x0a
defaultSteppingID uint8 = 0
)
// newEmptyFeatureSet creates a new FeatureSet with a sensible default model and no features.
func newEmptyFeatureSet() *FeatureSet {
return &FeatureSet{
Set: make(map[Feature]bool),
VendorID: defaultVendorID,
ExtendedFamily: defaultExtFamily,
ExtendedModel: defaultExtModel,
ProcessorType: defaultType,
Family: defaultFamily,
Model: defaultModel,
SteppingID: defaultSteppingID,
}
}
var justFPU = &FeatureSet{
Set: map[Feature]bool{
X86FeatureFPU: true,
}}
var justFPUandPAE = &FeatureSet{
Set: map[Feature]bool{
X86FeatureFPU: true,
X86FeaturePAE: true,
}}
func TestIsSubset(t *testing.T) {
if !justFPU.IsSubset(justFPUandPAE) {
t.Errorf("Got %v is not subset of %v, want IsSubset being true", justFPU, justFPUandPAE)
}
if justFPUandPAE.IsSubset(justFPU) {
t.Errorf("Got %v is a subset of %v, want IsSubset being false", justFPU, justFPUandPAE)
}
}
func TestTakeFeatureIntersection(t *testing.T) {
testFeatures := HostFeatureSet()
testFeatures.TakeFeatureIntersection(justFPU)
if !testFeatures.IsSubset(justFPU) {
t.Errorf("Got more features than expected after intersecting host features with justFPU: %v, want %v", testFeatures.Set, justFPU.Set)
}
if !testFeatures.HasFeature(X86FeatureFPU) {
t.Errorf("Got no features in testFeatures after intersecting, want %v", X86FeatureFPU)
}
}
// TODO: Run this test on a very old platform, and make sure more
// bits are enabled than just FPU and PAE. This test currently may not detect
// if HostFeatureSet gives back junk bits.
func TestHostFeatureSet(t *testing.T) {
hostFeatures := HostFeatureSet()
if !justFPUandPAE.IsSubset(hostFeatures) {
t.Errorf("Got invalid feature set %v from HostFeatureSet()", hostFeatures)
}
}
func TestHasFeature(t *testing.T) {
if !justFPU.HasFeature(X86FeatureFPU) {
t.Errorf("HasFeature failed, %v should contain %v", justFPU, X86FeatureFPU)
}
if justFPU.HasFeature(X86FeatureAVX) {
t.Errorf("HasFeature failed, %v should not contain %v", justFPU, X86FeatureAVX)
}
}
// Note: these tests are aware of and abuse internal details of FeatureSets.
// Users of FeatureSets should not depend on this.
func TestAdd(t *testing.T) {
// Test a basic insertion into the FeatureSet.
testFeatures := newEmptyFeatureSet()
testFeatures.Add(X86FeatureCLFSH)
if len(testFeatures.Set) != 1 {
t.Errorf("Got length %v want 1", len(testFeatures.Set))
}
if !testFeatures.HasFeature(X86FeatureCLFSH) {
t.Errorf("Add failed, got %v want set with %v", testFeatures, X86FeatureCLFSH)
}
// Test that duplicates are ignored.
testFeatures.Add(X86FeatureCLFSH)
if len(testFeatures.Set) != 1 {
t.Errorf("Got length %v, want 1", len(testFeatures.Set))
}
}
func TestRemove(t *testing.T) {
// Try removing the last feature.
testFeatures := newEmptyFeatureSet()
testFeatures.Add(X86FeatureFPU)
testFeatures.Add(X86FeaturePAE)
testFeatures.Remove(X86FeaturePAE)
if !testFeatures.HasFeature(X86FeatureFPU) || len(testFeatures.Set) != 1 || testFeatures.HasFeature(X86FeaturePAE) {
t.Errorf("Remove failed, got %v want %v", testFeatures, justFPU)
}
// Try removing a feature not in the set.
testFeatures.Remove(X86FeatureRDRAND)
if !testFeatures.HasFeature(X86FeatureFPU) || len(testFeatures.Set) != 1 {
t.Errorf("Remove failed, got %v want %v", testFeatures, justFPU)
}
}
func TestFeatureFromString(t *testing.T) {
f, ok := FeatureFromString("avx")
if f != X86FeatureAVX || !ok {
t.Errorf("got %v want avx", f)
}
f, ok = FeatureFromString("bad")
if ok {
t.Errorf("got %v want nothing", f)
}
}
// This tests function 0 (eax=0), which returns the vendor ID and highest cpuid
// function reported to be available.
func TestEmulateIDVendorAndLength(t *testing.T) {
testFeatures := newEmptyFeatureSet()
ax, bx, cx, dx := testFeatures.EmulateID(0, 0)
wantEax := uint32(0xd) // Highest supported cpuid function.
// These magical constants are the characters of "GenuineIntel".
// See Intel AN485 for a reference on why they are laid out like this.
wantEbx := uint32(0x756e6547)
wantEcx := uint32(0x6c65746e)
wantEdx := uint32(0x49656e69)
if wantEax != ax {
t.Errorf("highest function failed, got %x want %x", ax, wantEax)
}
if wantEbx != bx || wantEcx != cx || wantEdx != dx {
t.Errorf("vendor string emulation failed, bx:cx:dx, got %x:%x:%x want %x:%x:%x", bx, cx, dx, wantEbx, wantEcx, wantEdx)
}
}
func TestEmulateIDBasicFeatures(t *testing.T) {
// Make a minimal test feature set.
testFeatures := newEmptyFeatureSet()
testFeatures.Add(X86FeatureCLFSH)
testFeatures.Add(X86FeatureAVX)
ax, bx, cx, dx := testFeatures.EmulateID(1, 0)
ECXAVXBit := uint32(1 << uint(X86FeatureAVX))
EDXCLFlushBit := uint32(1 << uint(X86FeatureCLFSH-32)) // We adjust by 32 since it's in block 1.
if EDXCLFlushBit&dx == 0 || dx&^EDXCLFlushBit != 0 {
t.Errorf("EmulateID failed, got feature bits %x want %x", dx, testFeatures.blockMask(1))
}
if ECXAVXBit&cx == 0 || cx&^ECXAVXBit != 0 {
t.Errorf("EmulateID failed, got feature bits %x want %x", cx, testFeatures.blockMask(0))
}
// Default signature bits, based on values for i7/Xeon.
// See Intel AN485 for information on stepping/model bits.
defaultSignature := uint32(0x000106a0)
if defaultSignature != ax {
t.Errorf("EmulateID stepping emulation failed, got %x want %x", ax, defaultSignature)
}
clflushSizeInfo := uint32(8 << 8)
if clflushSizeInfo != bx {
t.Errorf("EmulateID bx emulation failed, got %x want %x", bx, clflushSizeInfo)
}
}
func TestEmulateIDExtendedFeatures(t *testing.T) {
// Make a minimal test feature set, one bit in each extended feature word.
testFeatures := newEmptyFeatureSet()
testFeatures.Add(X86FeatureSMEP)
testFeatures.Add(X86FeatureAVX512VBMI)
ax, bx, cx, dx := testFeatures.EmulateID(7, 0)
EBXSMEPBit := uint32(1 << uint(X86FeatureSMEP-2*32)) // Adjust by 2*32 since SMEP is a block 2 feature.
ECXAVXBit := uint32(1 << uint(X86FeatureAVX512VBMI-3*32)) // We adjust by 3*32 since it's a block 3 feature.
// Test that the desired bit is set and no other bits are set.
if EBXSMEPBit&bx == 0 || bx&^EBXSMEPBit != 0 {
t.Errorf("extended feature emulation failed, got feature bits %x want %x", bx, testFeatures.blockMask(2))
}
if ECXAVXBit&cx == 0 || cx&^ECXAVXBit != 0 {
t.Errorf("extended feature emulation failed, got feature bits %x want %x", cx, testFeatures.blockMask(3))
}
if ax != 0 || dx != 0 {
t.Errorf("extended feature emulation failed, ax:dx, got %x:%x want 0:0", ax, dx)
}
// Check that no subleaves other than 0 do anything.
ax, bx, cx, dx = testFeatures.EmulateID(7, 1)
if ax != 0 || bx != 0 || cx != 0 || dx != 0 {
t.Errorf("extended feature emulation failed, got %x:%x:%x:%x want 0:0", ax, bx, cx, dx)
}
}
// Checks that the expected extended features are available via cpuid functions
// 0x80000000 and up.
func TestEmulateIDExtended(t *testing.T) {
testFeatures := newEmptyFeatureSet()
testFeatures.Add(X86FeatureSYSCALL)
EDXSYSCALLBit := uint32(1 << uint(X86FeatureSYSCALL-6*32)) // Adjust by 6*32 since SYSCALL is a block 6 feature.
ax, bx, cx, dx := testFeatures.EmulateID(0x80000000, 0)
if ax != 0x80000001 || bx != 0 || cx != 0 || dx != 0 {
t.Errorf("EmulateID extended emulation failed, ax:bx:cx:dx, got %x:%x:%x:%x want 0x80000001:0:0:0", ax, bx, cx, dx)
}
_, _, _, dx = testFeatures.EmulateID(0x80000001, 0)
if EDXSYSCALLBit&dx == 0 || dx&^EDXSYSCALLBit != 0 {
t.Errorf("extended feature emulation failed, got feature bits %x want %x", dx, testFeatures.blockMask(6))
}
}
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