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detect_arm64.go
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detect_arm64.go
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// Copyright (c) 2015 Klaus Post, released under MIT License. See LICENSE file.
//+build arm64,!gccgo,!noasm,!appengine
package cpuid
func getMidr() (midr uint64)
func getProcFeatures() (procFeatures uint64)
func getInstAttributes() (instAttrReg0, instAttrReg1 uint64)
func initCPU() {
cpuid = func(uint32) (a, b, c, d uint32) { return 0, 0, 0, 0 }
cpuidex = func(x, y uint32) (a, b, c, d uint32) { return 0, 0, 0, 0 }
xgetbv = func(uint32) (a, b uint32) { return 0, 0 }
rdtscpAsm = func() (a, b, c, d uint32) { return 0, 0, 0, 0 }
}
func addInfo(c *CPUInfo) {
// midr := getMidr()
// MIDR_EL1 - Main ID Register
// x--------------------------------------------------x
// | Name | bits | visible |
// |--------------------------------------------------|
// | Implementer | [31-24] | y |
// |--------------------------------------------------|
// | Variant | [23-20] | y |
// |--------------------------------------------------|
// | Architecture | [19-16] | y |
// |--------------------------------------------------|
// | PartNum | [15-4] | y |
// |--------------------------------------------------|
// | Revision | [3-0] | y |
// x--------------------------------------------------x
// fmt.Printf(" implementer: 0x%02x\n", (midr>>24)&0xff)
// fmt.Printf(" variant: 0x%01x\n", (midr>>20)&0xf)
// fmt.Printf("architecture: 0x%01x\n", (midr>>16)&0xf)
// fmt.Printf(" part num: 0x%03x\n", (midr>>4)&0xfff)
// fmt.Printf(" revision: 0x%01x\n", (midr>>0)&0xf)
procFeatures := getProcFeatures()
// ID_AA64PFR0_EL1 - Processor Feature Register 0
// x--------------------------------------------------x
// | Name | bits | visible |
// |--------------------------------------------------|
// | DIT | [51-48] | y |
// |--------------------------------------------------|
// | SVE | [35-32] | y |
// |--------------------------------------------------|
// | GIC | [27-24] | n |
// |--------------------------------------------------|
// | AdvSIMD | [23-20] | y |
// |--------------------------------------------------|
// | FP | [19-16] | y |
// |--------------------------------------------------|
// | EL3 | [15-12] | n |
// |--------------------------------------------------|
// | EL2 | [11-8] | n |
// |--------------------------------------------------|
// | EL1 | [7-4] | n |
// |--------------------------------------------------|
// | EL0 | [3-0] | n |
// x--------------------------------------------------x
var f ArmFlags
// if procFeatures&(0xf<<48) != 0 {
// fmt.Println("DIT")
// }
if procFeatures&(0xf<<32) != 0 {
f |= SVE
}
if procFeatures&(0xf<<20) != 15<<20 {
f |= ASIMD
if procFeatures&(0xf<<20) == 1<<20 {
// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64pfr0_el1
// 0b0001 --> As for 0b0000, and also includes support for half-precision floating-point arithmetic.
f |= FPHP
f |= ASIMDHP
}
}
if procFeatures&(0xf<<16) != 0 {
f |= FP
}
instAttrReg0, instAttrReg1 := getInstAttributes()
// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64isar0_el1
//
// ID_AA64ISAR0_EL1 - Instruction Set Attribute Register 0
// x--------------------------------------------------x
// | Name | bits | visible |
// |--------------------------------------------------|
// | TS | [55-52] | y |
// |--------------------------------------------------|
// | FHM | [51-48] | y |
// |--------------------------------------------------|
// | DP | [47-44] | y |
// |--------------------------------------------------|
// | SM4 | [43-40] | y |
// |--------------------------------------------------|
// | SM3 | [39-36] | y |
// |--------------------------------------------------|
// | SHA3 | [35-32] | y |
// |--------------------------------------------------|
// | RDM | [31-28] | y |
// |--------------------------------------------------|
// | ATOMICS | [23-20] | y |
// |--------------------------------------------------|
// | CRC32 | [19-16] | y |
// |--------------------------------------------------|
// | SHA2 | [15-12] | y |
// |--------------------------------------------------|
// | SHA1 | [11-8] | y |
// |--------------------------------------------------|
// | AES | [7-4] | y |
// x--------------------------------------------------x
// if instAttrReg0&(0xf<<52) != 0 {
// fmt.Println("TS")
// }
// if instAttrReg0&(0xf<<48) != 0 {
// fmt.Println("FHM")
// }
if instAttrReg0&(0xf<<44) != 0 {
f |= ASIMDDP
}
if instAttrReg0&(0xf<<40) != 0 {
f |= SM4
}
if instAttrReg0&(0xf<<36) != 0 {
f |= SM3
}
if instAttrReg0&(0xf<<32) != 0 {
f |= SHA3
}
if instAttrReg0&(0xf<<28) != 0 {
f |= ASIMDRDM
}
if instAttrReg0&(0xf<<20) != 0 {
f |= ATOMICS
}
if instAttrReg0&(0xf<<16) != 0 {
f |= CRC32
}
if instAttrReg0&(0xf<<12) != 0 {
f |= SHA2
}
if instAttrReg0&(0xf<<12) == 2<<12 {
// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64isar0_el1
// 0b0010 --> As 0b0001, plus SHA512H, SHA512H2, SHA512SU0, and SHA512SU1 instructions implemented.
f |= SHA512
}
if instAttrReg0&(0xf<<8) != 0 {
f |= SHA1
}
if instAttrReg0&(0xf<<4) != 0 {
f |= AES
}
if instAttrReg0&(0xf<<4) == 2<<4 {
// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64isar0_el1
// 0b0010 --> As for 0b0001, plus PMULL/PMULL2 instructions operating on 64-bit data quantities.
f |= PMULL
}
// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64isar1_el1
//
// ID_AA64ISAR1_EL1 - Instruction set attribute register 1
// x--------------------------------------------------x
// | Name | bits | visible |
// |--------------------------------------------------|
// | GPI | [31-28] | y |
// |--------------------------------------------------|
// | GPA | [27-24] | y |
// |--------------------------------------------------|
// | LRCPC | [23-20] | y |
// |--------------------------------------------------|
// | FCMA | [19-16] | y |
// |--------------------------------------------------|
// | JSCVT | [15-12] | y |
// |--------------------------------------------------|
// | API | [11-8] | y |
// |--------------------------------------------------|
// | APA | [7-4] | y |
// |--------------------------------------------------|
// | DPB | [3-0] | y |
// x--------------------------------------------------x
// if instAttrReg1&(0xf<<28) != 0 {
// fmt.Println("GPI")
// }
if instAttrReg1&(0xf<<28) != 24 {
f |= GPA
}
if instAttrReg1&(0xf<<20) != 0 {
f |= LRCPC
}
if instAttrReg1&(0xf<<16) != 0 {
f |= FCMA
}
if instAttrReg1&(0xf<<12) != 0 {
f |= JSCVT
}
// if instAttrReg1&(0xf<<8) != 0 {
// fmt.Println("API")
// }
// if instAttrReg1&(0xf<<4) != 0 {
// fmt.Println("APA")
// }
if instAttrReg1&(0xf<<0) != 0 {
f |= DCPOP
}
c.Arm = f
}