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Enable pkg/sentry/hostcpu support on arm64. 

Signed-off-by: Haibo Xu haibo.xu@arm.com
Change-Id: I333872da9bdf56ddfa8ab2f034dfc1f36a7d3132
This commit is contained in:
Haibo Xu 2019-09-17 08:27:01 +00:00
parent 191297ecbe
commit cabe10e603
2 changed files with 29 additions and 0 deletions
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1
pkg/sentry/hostcpu/BUILD
View File

@ -7,6 +7,7 @@ go_library(
name = "hostcpu", name = "hostcpu",
srcs = [ srcs = [
"getcpu_amd64.s", "getcpu_amd64.s",
"getcpu_arm64.s",
"hostcpu.go", "hostcpu.go",
], ],
importpath = "gvisor.dev/gvisor/pkg/sentry/hostcpu", importpath = "gvisor.dev/gvisor/pkg/sentry/hostcpu",

28
pkg/sentry/hostcpu/getcpu_arm64.s Normal file
View File

@ -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