SPMDEVARCH_EL1 System Performance Monitors Device Architecture Register when FEAT_SPMU is implemented and FEAT_AA64 is implemented Provides discovery information for System PMU <s>. Unknown SPMDEVARCH_EL1 is a 64-bit register. 63 32 63:32 Reserved, RES0. ARCHITECT 31 21 31:21 Architect. Defines the architect of the component. Bits [31:28] are the JEP106 continuation code (JEP106 bank ID, minus 1) and bits [27:21] are the JEP106 ID code. This field has an IMPLEMENTATION DEFINED value. RO PRESENT 20 20 20 DEVARCH present. Defines that SPMDEVARCH_EL1 register is present. If SPMDEVARCH_EL1 is not present, the register is RES0. 0b0 Device Architecture information not present. 0b1 Device Architecture information present. REVISION 19 16 19:16 Revision. Defines the architecture revision of the component. This field has an IMPLEMENTATION DEFINED value. RO ARCHVER 15 12 15:12 Architecture Version. Defines the architecture version of the component. SPMDEVARCH_EL1.ARCHVER and SPMDEVARCH_EL1.ARCHPART are also defined as a single field, SPMDEVARCH_EL1.ARCHID, so that SPMDEVARCH_EL1.ARCHVER is SPMDEVARCH_EL1.ARCHID[15:12]. This field has an IMPLEMENTATION DEFINED value. RO ARCHPART 11 0 11:0 Architecture Part. Defines the architecture of the component. SPMDEVARCH_EL1.ARCHVER and SPMDEVARCH_EL1.ARCHPART are also defined as a single field, SPMDEVARCH_EL1.ARCHID, so that SPMDEVARCH_EL1.ARCHPART is SPMDEVARCH_EL1.ARCHID[11:0]. This field has an IMPLEMENTATION DEFINED value. RO To access SPMDEVARCH_EL1 for System PMU <s>, set SPMSELR_EL0.SYSPMUSEL to s. SPMDEVARCH_EL1 reads-as-zero if any of the following are true: System PMU <s> is not implemented. System PMU <s> does not implement SPMDEVARCH_EL1. MRS <Xt>, SPMDEVARCH_EL1 if !(IsFeatureImplemented(FEAT_SPMU) && IsFeatureImplemented(FEAT_AA64)) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().EnPM2 == '0' then Undefined(); elsif HaveEL(EL3) && EL3SDDUndefPriority() && SPMACCESSR_EL3()[UInt(SPMSELR_EL0().SYSPMUSEL) * 2+:2] == '00' then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT2) && ((HaveEL(EL3) && SCR_EL3().FGTEn2 == '0') || HDFGRTR2_EL2().nSPMID == '0') then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2().EnSPM == '0' then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && SPMACCESSR_EL2()[UInt(SPMSELR_EL0().SYSPMUSEL) * 2+:2] == '00' then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3().EnPM2 == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; elsif HaveEL(EL3) && SPMACCESSR_EL3()[UInt(SPMSELR_EL0().SYSPMUSEL) * 2+:2] == '00' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = SPMDEVARCH_EL1(UInt(SPMSELR_EL0().SYSPMUSEL)); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().EnPM2 == '0' then Undefined(); elsif HaveEL(EL3) && EL3SDDUndefPriority() && SPMACCESSR_EL3()[UInt(SPMSELR_EL0().SYSPMUSEL) * 2+:2] == '00' then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().EnPM2 == '0' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; elsif HaveEL(EL3) && SPMACCESSR_EL3()[UInt(SPMSELR_EL0().SYSPMUSEL) * 2+:2] == '00' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = SPMDEVARCH_EL1(UInt(SPMSELR_EL0().SYSPMUSEL)); end; elsif PSTATE.EL == EL3 then X{64}(t) = SPMDEVARCH_EL1(UInt(SPMSELR_EL0().SYSPMUSEL)); end; 2026-03-26 20:27:25 2026-03_rel