89de113de9
Don't rely on /proc/cpuinfo denoting a 64-bit ARMv8 processor if the runtime detected GOARCH == arm. This allows aarch64 32-bit userspace distros to run containers properly via a 32-bit runtime. Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
123 lines
3.0 KiB
Go
123 lines
3.0 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package platforms
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import (
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"bufio"
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"os"
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"runtime"
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"strings"
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"github.com/containerd/containerd/errdefs"
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"github.com/containerd/containerd/log"
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"github.com/pkg/errors"
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)
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// Present the ARM instruction set architecture, eg: v7, v8
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var cpuVariant string
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func init() {
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if isArmArch(runtime.GOARCH) {
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cpuVariant = getCPUVariant()
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} else {
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cpuVariant = ""
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}
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}
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// For Linux, the kernel has already detected the ABI, ISA and Features.
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// So we don't need to access the ARM registers to detect platform information
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// by ourselves. We can just parse these information from /proc/cpuinfo
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func getCPUInfo(pattern string) (info string, err error) {
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if !isLinuxOS(runtime.GOOS) {
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return "", errors.Wrapf(errdefs.ErrNotImplemented, "getCPUInfo for OS %s", runtime.GOOS)
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}
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cpuinfo, err := os.Open("/proc/cpuinfo")
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if err != nil {
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return "", err
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}
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defer cpuinfo.Close()
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// Start to Parse the Cpuinfo line by line. For SMP SoC, we parse
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// the first core is enough.
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scanner := bufio.NewScanner(cpuinfo)
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for scanner.Scan() {
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newline := scanner.Text()
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list := strings.Split(newline, ":")
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if len(list) > 1 && strings.EqualFold(strings.TrimSpace(list[0]), pattern) {
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return strings.TrimSpace(list[1]), nil
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}
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}
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// Check whether the scanner encountered errors
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err = scanner.Err()
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if err != nil {
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return "", err
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}
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return "", errors.Wrapf(errdefs.ErrNotFound, "getCPUInfo for pattern: %s", pattern)
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}
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func getCPUVariant() string {
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if runtime.GOOS == "windows" {
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// Windows only supports v7 for ARM32 and v8 for ARM64 and so we can use
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// runtime.GOARCH to determine the variants
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var variant string
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switch runtime.GOARCH {
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case "arm64":
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variant = "v8"
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case "arm":
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variant = "v7"
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default:
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variant = "unknown"
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}
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return variant
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}
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variant, err := getCPUInfo("Cpu architecture")
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if err != nil {
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log.L.WithError(err).Error("failure getting variant")
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return ""
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}
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switch strings.ToLower(variant) {
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case "8", "aarch64":
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// special case: if running a 32-bit userspace on aarch64, the variant should be "v7"
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if runtime.GOARCH == "arm" {
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variant = "v7"
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} else {
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variant = "v8"
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}
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case "7", "7m", "?(12)", "?(13)", "?(14)", "?(15)", "?(16)", "?(17)":
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variant = "v7"
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case "6", "6tej":
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variant = "v6"
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case "5", "5t", "5te", "5tej":
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variant = "v5"
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case "4", "4t":
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variant = "v4"
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case "3":
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variant = "v3"
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default:
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variant = "unknown"
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}
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return variant
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}
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