gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/cpuid/native_amd64.s (about)

     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