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Module arm64

Module arm64 

Source

Structs§

ArchitecturalFeatureTrapRegisterNoVhe
The layout of [CPTR_EL2] and [CPTR_EL3] when HCR_EL2.E2H == 0.
ArchitecturalFeatureTrapRegisterVhe
The layout of [CPTR_EL2] and [CPTR_EL3] when HCR_EL2.E2H == 1 (FEAT_VHE).
BreakpointControlRegister
The layout of DBGBCR<n>_EL1.
CacheLevelIdRegister
The layout of CLIDR_EL1.
CacheSizeIdRegister
The layout of CCSIDR_EL1.
CacheSizeIdRegisterCcidx
The layout of CCSIDR_EL1_CCIDX.
CacheSizeSelectionRegister
The layout of CSSELR_EL1.
CacheTypeRegister
The layout of CTR_EL0.
CounterTimerHypervisorControlRegisterNoVhe
The layout of [CNTHCTL_EL2] when HCR_EL2.E2H == 0.
CounterTimerHypervisorControlRegisterVhe
The layout of [CNTHCTL_EL2] when HCR_EL2.E2H == 1 (FEAT_VHE).
CurrentEl
The layout of CURRENT_EL.
Daif
The layout of DAIF.
DataCacheZeroIdRegister
The layout of DCZID_EL0.
ExceptionLinkRegister
The layout of ELR_EL1, ELR_EL2, and ELR_EL3.
ExceptionSyndromeRegister
The layout of ESR_EL1, ESR_EL2, and ESR_EL3.
ExtendedHypervisorConfigurationRegister
The layout of HCRX_EL2.
ExtendedTranslationControlRegister
The layout of TCR2_EL1.
HypervisorConfigurationRegister
The layout of HCR_EL2.
InstructionSetAttributeRegister0
The layout of ID_AA64ISAR0_EL1.
InstructionSetAttributeRegister1
The layout of ID_AA64ISAR1_EL1.
InstructionSetAttributeRegister2
The layout of ID_AA64ISAR2_EL1.
InterruptControllerSystemRegisterEnableRegister
The layout of ICC_SRE_EL1, ICC_SRE_EL2, and ICC_SRE_EL3.
MemoryAttrIndirectionRegister
The layout of MAIR_EL1 and MAIR_EL2.
MemoryModelFeatureRegister0
The layout of ID_AA64MMFR0_EL1.
MemoryModelFeatureRegister1
The layout of ID_AA64MMFR1_EL1.
MemoryModelFeatureRegister2
The layout of ID_AA64MMFR2_EL1.
MemoryModelFeatureRegister3
The layout of ID_AA64MMFR3_EL1.
MemoryModelFeatureRegister4
The layout of ID_AA64MMFR4_EL1.
MultiprocessorAffinityRegister
The layout of MPIDR_EL1 and VMPIDR_EL2.
Nzcv
The layout of NZCV.
ProcessorFeatureRegister0
The layout of ID_AA64PFR0_EL1.
ProcessorFeatureRegister1
The layout of ID_AA64PFR1_EL1.
SavedProgramStatusRegister
The layout of SPSR_EL1, SPSR_EL2, and SPSR_EL3.
SecureConfigurationRegister
The layout of SCR_EL3.
StackPointerRegister
The layout of SP_EL1, SP_EL2, and [SP_EL3].
SystemControlRegister2El1
The layout of SCTLR2_EL1.
SystemControlRegister2El2
The layout of SCTLR2_EL2.
SystemControlRegister2El3
The layout of SCTLR2_EL3.
SystemControlRegisterEl1
The layout of SCTLR_EL1.
SystemControlRegisterEl2
The layout of SCTLR_EL2.
SystemControlRegisterEl3
The layout of SCTLR_EL3.
TranslationControlRegisterEl1
The layout of TCR_EL1.
TranslationControlRegisterEl2
The layout of TCR_EL2.
TranslationTableBaseRegister
The layout of TTBR0_EL1, TTBR0_EL2, TTBR0_EL3, TTBR1_EL1, TTBR1_EL2, [TTBR1_EL3], and VTTBR_EL2.
VectorBaseAddressRegister
The layout of VBAR_EL1, VBAR_EL2, and VBAR_EL3.
VirtualizationTranslationControlRegister
The layout of VTCR_EL2.
WatchpointControlRegister
The layout of DBGWCR<n>_EL1.

Enums§

AsidSize
ASID size.
CacheType
The type of cache implemented at a given level, per the ctype<n> fields of CacheLevelIdRegister.
CacheabilityAttribute
The cacheability attribute of a normal memory regions, as defined by the TCR_ELx.IRGNn and TCR_ELx.ORGNn fields.
ExceptionClass
Some values are only possible in ESR_EL2 and/or ESR_EL3.
IdAa64IsaR0Aes
IdAa64IsaR0Atomic
IdAa64IsaR0Crc32
IdAa64IsaR0DotProd
IdAa64IsaR0Fhm
IdAa64IsaR0Rdm
IdAa64IsaR0Rndr
IdAa64IsaR0Sha1
IdAa64IsaR0Sha2
IdAa64IsaR0Sha3
IdAa64IsaR0Sm3
IdAa64IsaR0Sm4
IdAa64IsaR0Tlb
IdAa64IsaR0Ts
IdAa64IsaR1Bf16
IdAa64IsaR1Dgh
IdAa64IsaR1Dpb
IdAa64IsaR1Fcma
IdAa64IsaR1Frintts
IdAa64IsaR1Gpa
IdAa64IsaR1Gpi
IdAa64IsaR1I8mm
IdAa64IsaR1Jscvt
IdAa64IsaR1Lrcpc
IdAa64IsaR1Ls64
IdAa64IsaR1Pauth
IdAa64IsaR1Sb
IdAa64IsaR1Specres
IdAa64IsaR1Xs
IdAa64IsaR2Apa3
IdAa64IsaR2Ats1a
IdAa64IsaR2Bc
IdAa64IsaR2Clrbhb
IdAa64IsaR2Cssc
IdAa64IsaR2Gpa3
IdAa64IsaR2Lut
IdAa64IsaR2Mops
IdAa64IsaR2PacFrac
IdAa64IsaR2Prfmslc
IdAa64IsaR2Rpres
IdAa64IsaR2Rprfm
IdAa64IsaR2Sysinstr128
IdAa64IsaR2Sysreg128
IdAa64IsaR2Wfxt
IdAa64Pfr0Amu
IdAa64Pfr0Csv2
IdAa64Pfr0Csv3
IdAa64Pfr0Dit
IdAa64Pfr0El
IdAa64Pfr0Fp
IdAa64Pfr0Gic
IdAa64Pfr0Mpam
IdAa64Pfr0Ras
IdAa64Pfr0Sel2
IdAa64Pfr0Sve
IdAa64Pfr1El1Bt
IdAa64Pfr1El1Csv2Frac
IdAa64Pfr1El1Df2
IdAa64Pfr1El1Gcs
IdAa64Pfr1El1Mte
IdAa64Pfr1El1MteFrac
IdAa64Pfr1El1Mtex
IdAa64Pfr1El1Nmi
IdAa64Pfr1El1Pfar
IdAa64Pfr1El1RndrTrap
IdAa64Pfr1El1Sme
IdAa64Pfr1El1Ssbs
IdAa64Pfr1El1The
L1ICachePolicy
L1 instruction cache policy.
PhysicalAddressSize
Physical address size.
ShareabilityAttribute
The cache shareability attribute for memory regions, as defined by the TCR_ELx.SHn fields.
SpsrExceptionLevel
TagCacheType
The type of allocation tag cache implemented at a given level, per the ttype<n> fields of CacheLevelIdRegister (FEAT_MTE2).
TagCheckFault
TcrTg0Value
Granule size values for the TCR_EL1 and TCR_EL2 fields.
TcrTg1Value
Granule size values for the TCR_EL1.TG1 field.

Constants§

CCSIDR_EL1
[arm/sysreg]/ccsidr_el1: CCSIDR_EL1, Current Cache Size ID Register
CCSIDR_EL1_CCIDX
[arm/sysreg]/ccsidr_el1: CCSIDR_EL1, Current Cache Size ID Register
CLIDR_EL1
[arm/sysreg]/clidr_el1: CLIDR_EL1, Cache Level ID Register
CNTHCTL_EL2_NO_VHE
[arm/sysreg]/cnthctl_el2: Counter-timer Hypervisor Control register (EL2) when HCR_EL2.E2H == 0
CNTHCTL_EL2_VHE
[arm/sysreg]/cnthctl_el2: Counter-timer Hypervisor Control register (EL2) when HCR_EL2.E2H == 1 (FEAT_VHE)
CPTR_EL2_NO_VHE
[arm/sysreg]/cptr_el2: Architectural Feature Trap Register (EL2) when HCR_EL2.E2H == 0
CPTR_EL2_VHE
[arm/sysreg]/cptr_el2: Architectural Feature Trap Register (EL2) when HCR_EL2.E2H == 1 (FEAT_VHE)
CPTR_EL3_NO_VHE
[arm/sysreg]/cptr_el3: Architectural Feature Trap Register (EL3) when HCR_EL2.E2H == 0
CPTR_EL3_VHE
[arm/sysreg]/cptr_el3: Architectural Feature Trap Register (EL3) when HCR_EL2.E2H == 1 (FEAT_VHE)
CSSELR_EL1
[arm/sysreg]/csselr_el1: CSSELR_EL1, Cache Size Selection Register
CTR_EL0
[arm/v8]: D13.2.33 CTR_EL0, Cache Type Register.
CURRENT_EL
[arm/sysreg]/currentel: CurrentEL, Current Exception Level
DAIF
[arm/sysreg]/currentel: DAIF, Interrupt Mask Bits
DBGBCR0_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR1_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR2_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR3_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR4_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR5_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR6_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR7_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR8_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR9_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR10_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR11_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR12_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR13_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR14_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBCR15_EL1
[arm/sysreg]/dbgbcrn_el1: DBGBCR_EL1, Debug Breakpoint Control Registers
DBGBVR0_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR1_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR2_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR3_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR4_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR5_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR6_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR7_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR8_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR9_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR10_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR11_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR12_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR13_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR14_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGBVR15_EL1
[arm/sysreg]/dbgbvrn_el1: DBGBVR_EL1, Debug Breakpoint Value Registers
DBGWCR0_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR1_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR2_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR3_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR4_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR5_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR6_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR7_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR8_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR9_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR10_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR11_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR12_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR13_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR14_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWCR15_EL1
[arm/sysreg]/dbgwcrn_el1: DBGWCR_EL1, Debug Watchpoint Control Registers
DBGWVR0_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR1_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR2_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR3_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR4_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR5_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR6_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR7_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR8_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR9_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR10_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR11_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR12_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR13_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR14_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DBGWVR15_EL1
[arm/sysreg]/dbgwvrn_el1: DBGWVR_EL1, Debug Watchpoint Value Registers
DCZID_EL0
[arm/v8]: D13.2.36 DCZID_EL0, Data Cache Zero ID register
DEBUG_BANK_SIZE
The number of registers in each of the DBGB{C,V}R<n>_EL1 and DBGW{C,V}R<n>_EL1 banks; the count actually implemented is reported by ID_AA64DFR0_EL1.
ELR_EL1
[arm/sysreg]/elr_el1: Exception Link Register (EL1)
ELR_EL2
[arm/sysreg]/elr_el2: Exception Link Register (EL2)
ELR_EL3
[arm/sysreg]/elr_el3: Exception Link Register (EL3)
ESR_EL1
[arm/sysreg]/esr_el1: Exception Syndrome Register (El1)
ESR_EL2
[arm/sysreg]/esr_el2: Exception Syndrome Register (El2)
ESR_EL3
[arm/sysreg]/esr_el3: Exception Syndrome Register (El3)
HCRX_EL2
[arm/sysreg]/hcrx_el2: Extended Hypervisor Configuration register (EL2)
HCR_EL2
[arm/sysreg]/hcr_el2: Hypervisor Configuration register (EL2)
ICC_SRE_EL1
[arm/sysreg]/icc_sre_el1: Interrupt Controller System Register Enable Register (EL1)
ICC_SRE_EL2
[arm/sysreg]/icc_sre_el2: Interrupt Controller System Register Enable Register (EL2)
ICC_SRE_EL3
[arm/sysreg]/icc_sre_el3: Interrupt Controller System Register Enable Register (EL3)
ID_AA64ISAR0_EL1
[arm/sysreg]/ID_AA64ISAR0_EL1: AArch64 Instruction Set Attribute Register 0
ID_AA64ISAR1_EL1
[arm/sysreg]/ID_AA64ISAR1_EL1: AArch64 Instruction Set Attribute Register 1
ID_AA64ISAR2_EL1
[arm/sysreg]/ID_AA64ISAR2_EL1: AArch64 Instruction Set Attribute Register 2
ID_AA64MMFR0_EL1
[arm/v9]: D24.2.82 ID_AA64MMFR0_EL1, AArch64 Memory Model Feature Register 0
ID_AA64MMFR1_EL1
[arm/v9]: D24.2.83 ID_AA64MMFR1_EL1, AArch64 Memory Model Feature Register 1
ID_AA64MMFR2_EL1
[arm/v9]: D24.2.84 ID_AA64MMFR2_EL1, AArch64 Memory Model Feature Register 2
ID_AA64MMFR3_EL1
[arm/v9]: D24.2.85 ID_AA64MMFR3_EL1, AArch64 Memory Model Feature Register 3
ID_AA64MMFR4_EL1
[arm/v9]: D24.2.86 ID_AA64MMFR4_EL1, AArch64 Memory Model Feature Register 4
ID_AA64PFR0_EL1
[arm/sysreg]/ID_AA64PFR0_EL1: AArch64 Processor Feature Register 0
ID_AA64PFR1_EL1
[arm/sysreg]/ID_AA64PFR1_EL1: AArch64 Processor Feature Register 1
MAIR_EL1
[arm/v8]: D13.2.95 MAIR_EL1, Memory Attribute Indirection Register, EL1
MAIR_EL2
[arm/v8]: D13.2.96 MAIR_EL2, Memory Attribute Indirection Register, EL2
MPIDR_EL1
[arm/sysreg]/mpidr_el1: Multiprocessor Affinity Register (EL1)
NZCV
[arm/sysreg]/nzcv: Condition Flags
SCR_EL3
[arm/sysreg]/scr_el3: Secure Configuration Register
SCTLR2_EL1
[arm/sysreg]/sctlr2_el1: System Control Register 2 (EL1)
SCTLR2_EL2
[arm/sysreg]/sctlr2_el2: System Control Register 2 (EL2)
SCTLR2_EL3
[arm/sysreg]/sctlr2_el3: System Control Register 2 (EL3)
SCTLR_EL1
[arm/sysreg]/sctlr_el1: System Control Register (EL1)
SCTLR_EL2
[arm/sysreg]/sctlr_el2: System Control Register (EL2)
SCTLR_EL3
[arm/sysreg]/sctlr_el3: System Control Register (EL3)
SPSR_EL1
[arm/sysreg]/spsr_el1: Saved Program Status Register (El1)
SPSR_EL2
[arm/sysreg]/spsr_el2: Saved Program Status Register (El2)
SPSR_EL3
[arm/sysreg]/spsr_el3: Saved Program Status Register (El3)
SP_EL0
[arm/sysreg]/sp_el0: Stack Pointer (EL0)
SP_EL1
[arm/sysreg]/sp_el1: Stack Pointer (EL1)
SP_EL2
[arm/sysreg]/sp_el2: Stack Pointer (EL2)
TCR2_EL1
[arm/v9]: D23.2.172 TCR2_EL1, Translation Control Register (EL1)
TCR_EL1
[arm/v8]: D13.2.120 TCR_EL1, Translation Control Register (EL1)
TCR_EL2
[arm/v8]: D13.2.121 TCR_EL2, Translation Control Register (EL2)
TTBR0_EL1
[arm/v8]: D13.2.132 TTBR0_EL1, Translation Table Base Register 0 (EL1)
TTBR0_EL2
[arm/v8]: D13.2.133 TTBR0_EL2, Translation Table Base Register 0 (EL2)
TTBR0_EL3
[arm/v8]: D13.2.134 TTBR0_EL3, Translation Table Base Register 0 (EL3)
TTBR1_EL1
[arm/v8]: D13.2.135 TTBR1_EL1, Translation Table Base Register 1 (EL1)
TTBR1_EL2
[arm/v8]: D13.2.136 TTBR1_EL2, Translation Table Base Register 1 (EL2)
VBAR_EL1
[arm/sysreg]/vbar_el1: Vector Base Address Register (EL1)
VBAR_EL2
[arm/sysreg]/vbar_el2: Vector Base Address Register (EL2)
VBAR_EL3
[arm/sysreg]/vbar_el3: Vector Base Address Register (EL3)
VTCR_EL2
[arm/v8]: VTCR_EL2, Virtualization Translation Control Register
VTTBR_EL2
[arm/v8]: VTTBR_EL2, Virtualization Translation Table Base Register (EL2)