github.com/primecitizens/pcz/std@v0.2.1/core/cpu/cpu_s390x_test.go (about)

     1  // SPDX-License-Identifier: Apache-2.0
     2  // Copyright 2023 The Prime Citizens
     3  //
     4  // Copyright 2018 The Go Authors. All rights reserved.
     5  // Use of this source code is governed by a BSD-style
     6  // license that can be found in the LICENSE file.
     7  
     8  //go:build s390x
     9  
    10  package cpu_test
    11  
    12  import (
    13  	"errors"
    14  	"os"
    15  	"regexp"
    16  	"testing"
    17  
    18  	. "github.com/primecitizens/pcz/std/core/cpu"
    19  )
    20  
    21  func getFeatureList() ([]string, error) {
    22  	cpuinfo, err := os.ReadFile("/proc/cpuinfo")
    23  	if err != nil {
    24  		return nil, err
    25  	}
    26  	r := regexp.MustCompile("features\\s*:\\s*(.*)")
    27  	b := r.FindSubmatch(cpuinfo)
    28  	if len(b) < 2 {
    29  		return nil, errors.New("no feature list in /proc/cpuinfo")
    30  	}
    31  	return regexp.MustCompile("\\s+").Split(string(b[1]), -1), nil
    32  }
    33  
    34  func TestS390XAgainstCPUInfo(t *testing.T) {
    35  	// mapping of linux feature strings to S390X fields
    36  	mapping := make(map[string]*bool)
    37  	for _, option := range Options {
    38  		mapping[option.Name] = option.Feature
    39  	}
    40  
    41  	// these must be true on the machines Go supports
    42  	mandatory := make(map[string]bool)
    43  	mandatory["zarch"] = false
    44  	mandatory["eimm"] = false
    45  	mandatory["ldisp"] = false
    46  	mandatory["stfle"] = false
    47  
    48  	features, err := getFeatureList()
    49  	if err != nil {
    50  		t.Error(err)
    51  	}
    52  	for _, feature := range features {
    53  		if _, ok := mandatory[feature]; ok {
    54  			mandatory[feature] = true
    55  		}
    56  		if flag, ok := mapping[feature]; ok {
    57  			if !*flag {
    58  				t.Errorf("feature '%v' not detected", feature)
    59  			}
    60  		} else {
    61  			t.Logf("no entry for '%v'", feature)
    62  		}
    63  	}
    64  	for k, v := range mandatory {
    65  		if !v {
    66  			t.Errorf("mandatory feature '%v' not detected", k)
    67  		}
    68  	}
    69  }