source/cpu: add IBM Z CPU support to cpuid

source/cpu/cpuid_s390x.go

@@ -0,0 +1,85 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+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 cpu
+
+/*
+#include <sys/auxv.h>
+
+unsigned long gethwcap() {
+	return getauxval(AT_HWCAP);
+}
+*/
+import "C"
+
+/* all special features for s390x should be defined here */
+const (
+	/* AT_HWCAP features */
+	HWCAP_S390_ESAN3        = 1
+	HWCAP_S390_ZARCH        = 2
+	HWCAP_S390_STFLE        = 4
+	HWCAP_S390_MSA          = 8
+	HWCAP_S390_LDISP        = 16
+	HWCAP_S390_EIMM         = 32
+	HWCAP_S390_DFP          = 64
+	HWCAP_S390_HPAGE        = 128
+	HWCAP_S390_ETF3EH       = 256
+	HWCAP_S390_HIGH_GPRS    = 512
+	HWCAP_S390_TE           = 1024
+	HWCAP_S390_VX           = 2048
+	HWCAP_S390_VXD          = 4096
+	HWCAP_S390_VXE          = 8192
+	HWCAP_S390_GS           = 16384
+	HWCAP_S390_VXRS_EXT2    = 32768
+	HWCAP_S390_VXRS_PDE     = 65536
+	HWCAP_S390_SORT         = 131072
+	HWCAP_S390_DFLT         = 262144
+)
+
+var flagNames_s390x = map[uint64]string{
+	HWCAP_S390_ESAN3:       "ESAN3",
+	HWCAP_S390_ZARCH:       "ZARCH",
+	HWCAP_S390_STFLE:       "STFLE",
+	HWCAP_S390_MSA:         "MSA",
+	HWCAP_S390_LDISP:       "LDISP",
+	HWCAP_S390_EIMM:        "EIMM",
+	HWCAP_S390_DFP:         "DFP",
+	HWCAP_S390_HPAGE:       "EDAT",
+	HWCAP_S390_ETF3EH:      "ETF3EH",
+	HWCAP_S390_HIGH_GPRS:   "HIGHGPRS",
+	HWCAP_S390_TE:          "TE",
+	HWCAP_S390_VX:          "VX",
+	HWCAP_S390_VXD:         "VXD",
+	HWCAP_S390_VXE:         "VXE",
+	HWCAP_S390_GS:          "GS",
+	HWCAP_S390_VXRS_EXT2:   "VXE2",
+	HWCAP_S390_VXRS_PDE:    "VXP",
+	HWCAP_S390_SORT:        "SORT",
+	HWCAP_S390_DFLT:        "DFLT",
+}
+
+func getCpuidFlags() []string {
+	r := make([]string, 0, 20)
+	hwcap := uint64(C.gethwcap())
+	for i := uint(0); i < 64; i++ {
+		key := uint64(1 << i)
+		val := flagNames_s390x[key]
+		if hwcap&key != 0 {
+			r = append(r, val)
+		}
+	}
+	return r
+}