1// Copyright (c) 2015 Klaus Post, released under MIT License. See LICENSE file.
2
3//+build arm64,!gccgo,!noasm,!appengine
4
5// See https://www.kernel.org/doc/Documentation/arm64/cpu-feature-registers.txt
6
7// func getMidr
8TEXT ·getMidr(SB), 7, $0
9 WORD $0xd5380000 // mrs x0, midr_el1 /* Main ID Register */
10 MOVD R0, midr+0(FP)
11 RET
12
13// func getProcFeatures
14TEXT ·getProcFeatures(SB), 7, $0
15 WORD $0xd5380400 // mrs x0, id_aa64pfr0_el1 /* Processor Feature Register 0 */
16 MOVD R0, procFeatures+0(FP)
17 RET
18
19// func getInstAttributes
20TEXT ·getInstAttributes(SB), 7, $0
21 WORD $0xd5380600 // mrs x0, id_aa64isar0_el1 /* Instruction Set Attribute Register 0 */
22 WORD $0xd5380621 // mrs x1, id_aa64isar1_el1 /* Instruction Set Attribute Register 1 */
23 MOVD R0, instAttrReg0+0(FP)
24 MOVD R1, instAttrReg1+8(FP)
25 RET
26
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