1 // Copyright 2018 The gVisor Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 15 #include "textflag.h"
16 17 TEXT ·native(SB),NOSPLIT|NOFRAME,$0-24
18 MOVL arg_Eax+0(FP), AX
19 MOVL arg_Ecx+4(FP), CX
20 CPUID
21 MOVL AX, ret_Eax+8(FP)
22 MOVL BX, ret_Ebx+12(FP)
23 MOVL CX, ret_Ecx+16(FP)
24 MOVL DX, ret_Edx+20(FP)
25 RET
26 27 // xgetbv reads an extended control register.
28 //
29 // The code corresponds to:
30 //
31 // xgetbv
32 //
33 TEXT ·xgetbv(SB),NOSPLIT|NOFRAME,$0-16
34 MOVQ reg+0(FP), CX
35 BYTE $0x0f; BYTE $0x01; BYTE $0xd0;
36 MOVL AX, ret+8(FP)
37 MOVL DX, ret+12(FP)
38 RET
39