ci: add basic CI functionalities

.github/workflows/go.yml

@@ -0,0 +1,39 @@
+name: Go
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  linters:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.22.x'
+    - name: Check vendored dependencies
+      run: |
+        go mod tidy
+        go mod verify
+    - name: gofmt
+      run: test -z "$(gofmt -s -l $(find -name '*.go' | grep -v /vendor/))"
+
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '1.22.x'
+
+    - name: Build Example
+      run: go run -mod=mod -v examples/*.go
+
+    - name: Vet Test
+      run: go vet -composites=false -mod=mod ./...

.github/workflows/golangci-lint.yml

@@ -0,0 +1,28 @@
+name: golangci-lint
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.22'
+          cache: false
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v6
+        with:
+          version: v1.63.4
+          args: --out-format=line-number --timeout=5m

cpuid.go

@@ -1,5 +1,5 @@
 // Copyright 2015 Intel Corporation.
-// Copyright 2025 the u-root authors. All rights reserved.
+// Copyright 2025 the u-root Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
@@ -297,16 +297,22 @@ var brandStrings = map[string]int{
 	"XenVMMXenVMM": XEN,
 }
 
-var maxInputValue uint32
-var maxExtendedInputValue uint32
-var extendedModelId uint32
-var extendedFamilyId uint32
-var brandIndex uint32
-var brandId int
-var featureFlags uint64
-var thermalAndPowerFeatureFlags uint32
-var extendedFeatureFlags uint64
-var extraFeatureFlags uint64
+// golanci-lint triggers false positives for ”unused” variables
+var (
+	maxInputValue         uint32
+	maxExtendedInputValue uint32
+	//nolint:unused
+	extendedModelId uint32
+	//nolint:unused
+	extendedFamilyId uint32
+	//nolint:unused
+	brandIndex                  uint32
+	brandId                     int
+	featureFlags                uint64
+	thermalAndPowerFeatureFlags uint32
+	extendedFeatureFlags        uint64
+	extraFeatureFlags           uint64
+)
 
 const (
 	UKNOWN = iota

cpuid_amd64.go

@@ -1,4 +1,5 @@
 // Copyright 2015 Intel Corporation.
+// Copyright 2025 the u-root Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
@@ -39,17 +40,6 @@ func detectFeatures() {
 	}
 }
 
-var leaf02Names = [...]string{
-	"NULL",
-	"DATA_CACHE",
-	"INSTRUCTION_CACHE",
-	"UNIFIED_CACHE",
-	"TLB",
-	"DTLB",
-	"STLB",
-	"PREFETCH",
-}
-
 func leaf0() {
 
 	eax, ebx, ecx, edx := cpuid_low(0, 0)

cpuid_amd64_tinygo.go

@@ -70,17 +70,6 @@ func detectFeatures() {
 	}
 }
 
-var leaf02Names = [...]string{
-	"NULL",
-	"DATA_CACHE",
-	"INSTRUCTION_CACHE",
-	"UNIFIED_CACHE",
-	"TLB",
-	"DTLB",
-	"STLB",
-	"PREFETCH",
-}
-
 func leaf0() {
 
 	eax, ebx, ecx, edx := cpuid_low(0, 0)

examples/example.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"github.com/u-root/cpuid"
+)
+
+func main() {
+	fmt.Printf("VendorString:   %s\n", cpuid.VendorIdentificatorString)
+
+	fmt.Printf("Features: ")
+	for i := uint64(0); i < 64; i++ {
+		if cpuid.HasFeature(1 << i) {
+			fmt.Printf("%s ", cpuid.FeatureNames[1<<i])
+		}
+	}
+	fmt.Printf("\n")
+
+	fmt.Printf("ExtendedFeatures: ")
+	for i := uint64(0); i < 64; i++ {
+		if cpuid.HasExtendedFeature(1 << i) {
+			fmt.Printf("%s ", cpuid.ExtendedFeatureNames[1<<i])
+		}
+	}
+	fmt.Printf("\n")
+
+	fmt.Printf("ExtraFeatures: ")
+	for i := uint64(0); i < 64; i++ {
+		if cpuid.HasExtraFeature(1 << i) {
+			fmt.Printf("%s ", cpuid.ExtraFeatureNames[1<<i])
+		}
+	}
+	fmt.Printf("\n")
+}