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cpuid_arm64.s (855B)

      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
      8 TEXT ·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
     14 TEXT ·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
     20 TEXT ·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