2021-10-16 21:11:32 +00:00
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// Copyright (c) 2015 Klaus Post, released under MIT License. See LICENSE file.
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2022-03-31 22:23:19 +00:00
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//go:build arm64 && !gccgo && !noasm && !appengine
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// +build arm64,!gccgo,!noasm,!appengine
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2021-10-16 21:11:32 +00:00
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package cpuid
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import "runtime"
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func getMidr() (midr uint64)
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func getProcFeatures() (procFeatures uint64)
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func getInstAttributes() (instAttrReg0, instAttrReg1 uint64)
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func initCPU() {
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cpuid = func(uint32) (a, b, c, d uint32) { return 0, 0, 0, 0 }
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cpuidex = func(x, y uint32) (a, b, c, d uint32) { return 0, 0, 0, 0 }
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xgetbv = func(uint32) (a, b uint32) { return 0, 0 }
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rdtscpAsm = func() (a, b, c, d uint32) { return 0, 0, 0, 0 }
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}
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func addInfo(c *CPUInfo, safe bool) {
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// Seems to be safe to assume on ARM64
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c.CacheLine = 64
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detectOS(c)
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// ARM64 disabled since it may crash if interrupt is not intercepted by OS.
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if safe && !c.Supports(ARMCPUID) && runtime.GOOS != "freebsd" {
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return
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}
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midr := getMidr()
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// MIDR_EL1 - Main ID Register
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// https://developer.arm.com/docs/ddi0595/h/aarch64-system-registers/midr_el1
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// x--------------------------------------------------x
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// | Name | bits | visible |
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// |--------------------------------------------------|
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// | Implementer | [31-24] | y |
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// |--------------------------------------------------|
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// | Variant | [23-20] | y |
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// |--------------------------------------------------|
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// | Architecture | [19-16] | y |
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// |--------------------------------------------------|
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// | PartNum | [15-4] | y |
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// |--------------------------------------------------|
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// | Revision | [3-0] | y |
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// x--------------------------------------------------x
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switch (midr >> 24) & 0xff {
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case 0xC0:
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c.VendorString = "Ampere Computing"
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c.VendorID = Ampere
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case 0x41:
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c.VendorString = "Arm Limited"
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c.VendorID = ARM
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case 0x42:
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c.VendorString = "Broadcom Corporation"
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c.VendorID = Broadcom
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case 0x43:
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c.VendorString = "Cavium Inc"
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c.VendorID = Cavium
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case 0x44:
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c.VendorString = "Digital Equipment Corporation"
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c.VendorID = DEC
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case 0x46:
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c.VendorString = "Fujitsu Ltd"
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c.VendorID = Fujitsu
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case 0x49:
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c.VendorString = "Infineon Technologies AG"
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c.VendorID = Infineon
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case 0x4D:
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c.VendorString = "Motorola or Freescale Semiconductor Inc"
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c.VendorID = Motorola
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case 0x4E:
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c.VendorString = "NVIDIA Corporation"
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c.VendorID = NVIDIA
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case 0x50:
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c.VendorString = "Applied Micro Circuits Corporation"
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c.VendorID = AMCC
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case 0x51:
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c.VendorString = "Qualcomm Inc"
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c.VendorID = Qualcomm
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case 0x56:
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c.VendorString = "Marvell International Ltd"
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c.VendorID = Marvell
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case 0x69:
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c.VendorString = "Intel Corporation"
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c.VendorID = Intel
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}
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// Lower 4 bits: Architecture
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// Architecture Meaning
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// 0b0001 Armv4.
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// 0b0010 Armv4T.
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// 0b0011 Armv5 (obsolete).
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// 0b0100 Armv5T.
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// 0b0101 Armv5TE.
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// 0b0110 Armv5TEJ.
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// 0b0111 Armv6.
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// 0b1111 Architectural features are individually identified in the ID_* registers, see 'ID registers'.
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// Upper 4 bit: Variant
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// An IMPLEMENTATION DEFINED variant number.
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// Typically, this field is used to distinguish between different product variants, or major revisions of a product.
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c.Family = int(midr>>16) & 0xff
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// PartNum, bits [15:4]
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// An IMPLEMENTATION DEFINED primary part number for the device.
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// On processors implemented by Arm, if the top four bits of the primary
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// part number are 0x0 or 0x7, the variant and architecture are encoded differently.
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// Revision, bits [3:0]
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// An IMPLEMENTATION DEFINED revision number for the device.
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c.Model = int(midr) & 0xffff
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procFeatures := getProcFeatures()
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// ID_AA64PFR0_EL1 - Processor Feature Register 0
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// x--------------------------------------------------x
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// | Name | bits | visible |
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// |--------------------------------------------------|
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// | DIT | [51-48] | y |
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// |--------------------------------------------------|
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// | SVE | [35-32] | y |
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// |--------------------------------------------------|
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// | GIC | [27-24] | n |
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// |--------------------------------------------------|
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// | AdvSIMD | [23-20] | y |
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// |--------------------------------------------------|
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// | FP | [19-16] | y |
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// |--------------------------------------------------|
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// | EL3 | [15-12] | n |
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// |--------------------------------------------------|
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// | EL2 | [11-8] | n |
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// |--------------------------------------------------|
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// | EL1 | [7-4] | n |
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// |--------------------------------------------------|
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// | EL0 | [3-0] | n |
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// x--------------------------------------------------x
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var f flagSet
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// if procFeatures&(0xf<<48) != 0 {
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// fmt.Println("DIT")
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// }
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f.setIf(procFeatures&(0xf<<32) != 0, SVE)
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if procFeatures&(0xf<<20) != 15<<20 {
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f.set(ASIMD)
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// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64pfr0_el1
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// 0b0001 --> As for 0b0000, and also includes support for half-precision floating-point arithmetic.
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f.setIf(procFeatures&(0xf<<20) == 1<<20, FPHP, ASIMDHP)
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}
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f.setIf(procFeatures&(0xf<<16) != 0, FP)
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instAttrReg0, instAttrReg1 := getInstAttributes()
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// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64isar0_el1
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//
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// ID_AA64ISAR0_EL1 - Instruction Set Attribute Register 0
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// x--------------------------------------------------x
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// | Name | bits | visible |
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// |--------------------------------------------------|
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// | TS | [55-52] | y |
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// |--------------------------------------------------|
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// | FHM | [51-48] | y |
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// |--------------------------------------------------|
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// | DP | [47-44] | y |
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// |--------------------------------------------------|
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// | SM4 | [43-40] | y |
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// |--------------------------------------------------|
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// | SM3 | [39-36] | y |
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// |--------------------------------------------------|
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// | SHA3 | [35-32] | y |
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// |--------------------------------------------------|
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// | RDM | [31-28] | y |
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// |--------------------------------------------------|
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// | ATOMICS | [23-20] | y |
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// |--------------------------------------------------|
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// | CRC32 | [19-16] | y |
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// |--------------------------------------------------|
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// | SHA2 | [15-12] | y |
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// |--------------------------------------------------|
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// | SHA1 | [11-8] | y |
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// |--------------------------------------------------|
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// | AES | [7-4] | y |
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// x--------------------------------------------------x
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// if instAttrReg0&(0xf<<52) != 0 {
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// fmt.Println("TS")
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// }
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// if instAttrReg0&(0xf<<48) != 0 {
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// fmt.Println("FHM")
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// }
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f.setIf(instAttrReg0&(0xf<<44) != 0, ASIMDDP)
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f.setIf(instAttrReg0&(0xf<<40) != 0, SM4)
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f.setIf(instAttrReg0&(0xf<<36) != 0, SM3)
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f.setIf(instAttrReg0&(0xf<<32) != 0, SHA3)
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f.setIf(instAttrReg0&(0xf<<28) != 0, ASIMDRDM)
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f.setIf(instAttrReg0&(0xf<<20) != 0, ATOMICS)
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f.setIf(instAttrReg0&(0xf<<16) != 0, CRC32)
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f.setIf(instAttrReg0&(0xf<<12) != 0, SHA2)
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// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64isar0_el1
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// 0b0010 --> As 0b0001, plus SHA512H, SHA512H2, SHA512SU0, and SHA512SU1 instructions implemented.
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f.setIf(instAttrReg0&(0xf<<12) == 2<<12, SHA512)
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f.setIf(instAttrReg0&(0xf<<8) != 0, SHA1)
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f.setIf(instAttrReg0&(0xf<<4) != 0, AESARM)
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// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64isar0_el1
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// 0b0010 --> As for 0b0001, plus PMULL/PMULL2 instructions operating on 64-bit data quantities.
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f.setIf(instAttrReg0&(0xf<<4) == 2<<4, PMULL)
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// https://developer.arm.com/docs/ddi0595/b/aarch64-system-registers/id_aa64isar1_el1
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//
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// ID_AA64ISAR1_EL1 - Instruction set attribute register 1
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// x--------------------------------------------------x
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// | Name | bits | visible |
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// |--------------------------------------------------|
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// | GPI | [31-28] | y |
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// |--------------------------------------------------|
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// | GPA | [27-24] | y |
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// |--------------------------------------------------|
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// | LRCPC | [23-20] | y |
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// |--------------------------------------------------|
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// | FCMA | [19-16] | y |
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// |--------------------------------------------------|
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// | JSCVT | [15-12] | y |
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// |--------------------------------------------------|
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// | API | [11-8] | y |
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// |--------------------------------------------------|
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// | APA | [7-4] | y |
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// |--------------------------------------------------|
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// | DPB | [3-0] | y |
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// x--------------------------------------------------x
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// if instAttrReg1&(0xf<<28) != 0 {
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// fmt.Println("GPI")
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// }
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f.setIf(instAttrReg1&(0xf<<28) != 24, GPA)
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f.setIf(instAttrReg1&(0xf<<20) != 0, LRCPC)
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f.setIf(instAttrReg1&(0xf<<16) != 0, FCMA)
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f.setIf(instAttrReg1&(0xf<<12) != 0, JSCVT)
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// if instAttrReg1&(0xf<<8) != 0 {
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// fmt.Println("API")
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// }
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// if instAttrReg1&(0xf<<4) != 0 {
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// fmt.Println("APA")
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// }
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f.setIf(instAttrReg1&(0xf<<0) != 0, DCPOP)
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// Store
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c.featureSet.or(f)
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}
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