| // Copyright (c) 2015 Klaus Post, released under MIT License. See LICENSE file. |
| |
| //+build amd64,!gccgo,!noasm,!appengine |
| |
| // func asmCpuid(op uint32) (eax, ebx, ecx, edx uint32) |
| TEXT ·asmCpuid(SB), 7, $0 |
| XORQ CX, CX |
| MOVL op+0(FP), AX |
| CPUID |
| MOVL AX, eax+8(FP) |
| MOVL BX, ebx+12(FP) |
| MOVL CX, ecx+16(FP) |
| MOVL DX, edx+20(FP) |
| RET |
| |
| // func asmCpuidex(op, op2 uint32) (eax, ebx, ecx, edx uint32) |
| TEXT ·asmCpuidex(SB), 7, $0 |
| MOVL op+0(FP), AX |
| MOVL op2+4(FP), CX |
| CPUID |
| MOVL AX, eax+8(FP) |
| MOVL BX, ebx+12(FP) |
| MOVL CX, ecx+16(FP) |
| MOVL DX, edx+20(FP) |
| RET |
| |
| // func asmXgetbv(index uint32) (eax, edx uint32) |
| TEXT ·asmXgetbv(SB), 7, $0 |
| MOVL index+0(FP), CX |
| BYTE $0x0f; BYTE $0x01; BYTE $0xd0 // XGETBV |
| MOVL AX, eax+8(FP) |
| MOVL DX, edx+12(FP) |
| RET |
| |
| // func asmRdtscpAsm() (eax, ebx, ecx, edx uint32) |
| TEXT ·asmRdtscpAsm(SB), 7, $0 |
| BYTE $0x0F; BYTE $0x01; BYTE $0xF9 // RDTSCP |
| MOVL AX, eax+0(FP) |
| MOVL BX, ebx+4(FP) |
| MOVL CX, ecx+8(FP) |
| MOVL DX, edx+12(FP) |
| RET |
| |
| // From https://go-review.googlesource.com/c/sys/+/285572/ |
| // func asmDarwinHasAVX512() bool |
| TEXT ·asmDarwinHasAVX512(SB), 7, $0-1 |
| MOVB $0, ret+0(FP) // default to false |
| |
| #ifdef GOOS_darwin // return if not darwin |
| #ifdef GOARCH_amd64 // return if not amd64 |
| // These values from: |
| // https://github.com/apple/darwin-xnu/blob/xnu-4570.1.46/osfmk/i386/cpu_capabilities.h |
| #define commpage64_base_address 0x00007fffffe00000 |
| #define commpage64_cpu_capabilities64 (commpage64_base_address+0x010) |
| #define commpage64_version (commpage64_base_address+0x01E) |
| #define hasAVX512F 0x0000004000000000 |
| MOVQ $commpage64_version, BX |
| MOVW (BX), AX |
| CMPW AX, $13 // versions < 13 do not support AVX512 |
| JL no_avx512 |
| MOVQ $commpage64_cpu_capabilities64, BX |
| MOVQ (BX), AX |
| MOVQ $hasAVX512F, CX |
| ANDQ CX, AX |
| JZ no_avx512 |
| MOVB $1, ret+0(FP) |
| |
| no_avx512: |
| #endif |
| #endif |
| RET |
| |