diff options
| author | gVisor bot <gvisor-bot@google.com> | 2019-09-19 12:03:38 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-09-19 12:03:38 -0700 |
| commit | 1c0324d5a19535cac7369abf2e32f6148fcdcd80 (patch) | |
| tree | 791efaa6e0ea9d300f119034dc1591fa65f0ec74 | |
| parent | 0a8a75f3dabaf5c097710c3bb961b67b8ed653b5 (diff) | |
| parent | cabe10e603f36d610b7d3858c0911fc2dde26411 (diff) | |
Merge pull request #876 from xiaobo55x:hostcpu
PiperOrigin-RevId: 270094324
| -rw-r--r-- | pkg/sentry/hostcpu/BUILD | 1 | ||||
| -rw-r--r-- | pkg/sentry/hostcpu/getcpu_arm64.s | 28 |
2 files changed, 29 insertions, 0 deletions
diff --git a/pkg/sentry/hostcpu/BUILD b/pkg/sentry/hostcpu/BUILD index d4a420e60..359468ccc 100644 --- a/pkg/sentry/hostcpu/BUILD +++ b/pkg/sentry/hostcpu/BUILD @@ -7,6 +7,7 @@ go_library( name = "hostcpu", srcs = [ "getcpu_amd64.s", + "getcpu_arm64.s", "hostcpu.go", ], importpath = "gvisor.dev/gvisor/pkg/sentry/hostcpu", diff --git a/pkg/sentry/hostcpu/getcpu_arm64.s b/pkg/sentry/hostcpu/getcpu_arm64.s new file mode 100644 index 000000000..caf9abb89 --- /dev/null +++ b/pkg/sentry/hostcpu/getcpu_arm64.s @@ -0,0 +1,28 @@ +// Copyright 2019 The gVisor 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. + +#include "textflag.h" + +// GetCPU makes the getcpu(unsigned *cpu, unsigned *node, NULL) syscall for +// the lack of an optimazed way of getting the current CPU number on arm64. + +// func GetCPU() (cpu uint32) +TEXT ·GetCPU(SB), NOSPLIT, $0-4 + MOVW ZR, cpu+0(FP) + MOVD $cpu+0(FP), R0 + MOVD $0x0, R1 // unused + MOVD $0x0, R2 // unused + MOVD $0xA8, R8 // SYS_GETCPU + SVC + RET |