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| author | Haibo Xu <haibo.xu@arm.com> | 2019-09-17 08:27:01 +0000 |
|---|---|---|
| committer | Haibo Xu <haibo.xu@arm.com> | 2019-09-18 23:51:42 +0000 |
| commit | cabe10e603f36d610b7d3858c0911fc2dde26411 (patch) | |
| tree | 69c13cd1ea3fb1dad02244b95ba9e269cba58972 /pkg/sentry/hostcpu/getcpu_arm64.s | |
| parent | 191297ecbe3ae57bbf51b889d33d78e6700eee5b (diff) | |
Enable pkg/sentry/hostcpu support on arm64.
Signed-off-by: Haibo Xu haibo.xu@arm.com
Change-Id: I333872da9bdf56ddfa8ab2f034dfc1f36a7d3132
Diffstat (limited to 'pkg/sentry/hostcpu/getcpu_arm64.s')
| -rw-r--r-- | pkg/sentry/hostcpu/getcpu_arm64.s | 28 |
1 files changed, 28 insertions, 0 deletions
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 |