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HFGRTR_EL2, Hypervisor Fine-Grained Read Trap Register

The HFGRTR_EL2 characteristics are:

Purpose

Provides controls for traps of MRS and MRC reads of System registers.

Configuration

This register is present only when FEAT_FGT is implemented. Otherwise, direct accesses to HFGRTR_EL2 are UNDEFINED.

Attributes

HFGRTR_EL2 is a 64-bit register.

Field descriptions

The HFGRTR_EL2 bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0nCSR_EL1nCSR_EL0nCSRIDR_EL0nACCDATA_EL1ERXADDR_EL1ERXPFGCDN_EL1ERXPFGCTL_EL1ERXPFGF_EL1ERXMISCn_EL1ERXSTATUS_EL1ERXCTLR_EL1ERXFR_EL1ERRSELR_EL1ERRIDR_EL1ICC_IGRPENn_EL1VBAR_EL1TTBR1_EL1TTBR0_EL1TPIDR_EL0TPIDRRO_EL0TPIDR_EL1TCR_EL1
SCXTNUM_EL0SCXTNUM_EL1SCTLR_EL1REVIDR_EL1PAR_EL1MPIDR_EL1MIDR_EL1MAIR_EL1LORSA_EL1LORN_EL1LORID_EL1LOREA_EL1LORC_EL1ISR_EL1FAR_EL1ESR_EL1DCZID_EL0CTR_EL0CSSELR_EL1CPACR_EL1CONTEXTIDR_EL1CLIDR_EL1CCSIDR_EL1APIBKeyAPIAKeyAPGAKeyAPDBKeyAPDAKeyAMAIR_EL1AIDR_EL1AFSR1_EL1AFSR0_EL1
313029282726252423222120191817161514131211109876543210

Bits [63:54]

Reserved, RES0.

nCSR_EL1, bit [53]

When FEAT_CSRE is implemented:

Trap MRS reads of multiple System registers. Enables a trap on MRS reads at EL1 using AArch64 of any of the following AArch64 System registers to EL2:

nCSR_EL1Meaning
0b0

If EL2 is implemented and enabled in the current Security state then MRS reads at EL1 using AArch64 of any of the System registers listed above are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

0b1

MRS reads of the System registers listed above are not affected by this bit.

This bit is ignored by the PE and treated as zero when EL3 is implemented and SCR_EL3.FGTEn == 0b0.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

nCSR_EL0, bit [52]

When FEAT_CSRE is implemented:

Trap MRS reads of multiple System registers. Enables a trap on MRS reads at EL1 and EL0 using AArch64 of any of the following AArch64 System registers to EL2:

nCSR_EL0Meaning
0b0

If EL2 is implemented and enabled in the current Security state, and HCR_EL2.{E2H,TGE} != {1,1}, then MRS reads at EL1 and EL0 using AArch64 of any of the System registers listed above are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

0b1

MRS reads of the System registers listed above are not affected by this bit.

This bit is ignored by the PE and treated as zero when EL3 is implemented and SCR_EL3.FGTEn == 0b0.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

nCSRIDR_EL0, bit [51]

When FEAT_CSRE is implemented:

Trap MRS reads of CSRIDR_EL0 at EL1 and EL0 using AArch64 to EL2.

nCSRIDR_EL0Meaning
0b0

If EL2 is implemented and enabled in the current Security state, and HCR_EL2.{E2H,TGE} != {1,1}, then MRS reads of CSRIDR_EL0 at EL1 and EL0 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

0b1

MRS reads of CSRIDR_EL0 are not affected by this bit.

This bit is ignored by the PE and treated as zero when EL3 is implemented and SCR_EL3.FGTEn == 0b0.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

nACCDATA_EL1, bit [50]

When FEAT_LS64 is implemented:

Trap MRS reads of ACCDATA_EL1 at EL1 using AArch64 to EL2.

nACCDATA_EL1Meaning
0b0

If EL2 is implemented and enabled in the current Security state then MRS reads of ACCDATA_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

0b1

MRS reads of ACCDATA_EL1 are not affected by this bit.

This bit is ignored by the PE and treated as zero when EL3 is implemented and SCR_EL3.FGTEn == 0b0.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERXADDR_EL1, bit [49]

When FEAT_RAS is implemented:

Trap MRS reads of ERXADDR_EL1 at EL1 using AArch64 to EL2.

ERXADDR_EL1Meaning
0b0

MRS reads of ERXADDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERXADDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERXPFGCDN_EL1, bit [48]

When FEAT_RASv1p1 is implemented:

Trap MRS reads of ERXPFGCDN_EL1 at EL1 using AArch64 to EL2.

ERXPFGCDN_EL1Meaning
0b0

MRS reads of ERXPFGCDN_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERXPFGCDN_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERXPFGCTL_EL1, bit [47]

When FEAT_RASv1p1 is implemented:

Trap MRS reads of ERXPFGCTL_EL1 at EL1 using AArch64 to EL2.

ERXPFGCTL_EL1Meaning
0b0

MRS reads of ERXPFGCTL_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERXPFGCTL_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERXPFGF_EL1, bit [46]

When FEAT_RAS is implemented:

Trap MRS reads of ERXPFGF_EL1 at EL1 using AArch64 to EL2.

ERXPFGF_EL1Meaning
0b0

MRS reads of ERXPFGF_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERXPFGF_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERXMISCn_EL1, bit [45]

When FEAT_RAS is implemented:

Trap MRS reads of ERXMISC<n>_EL1 at EL1 using AArch64 to EL2.

ERXMISCn_EL1Meaning
0b0

MRS reads of ERXMISC<n>_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERXMISC<n>_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERXSTATUS_EL1, bit [44]

When FEAT_RAS is implemented:

Trap MRS reads of ERXSTATUS_EL1 at EL1 using AArch64 to EL2.

ERXSTATUS_EL1Meaning
0b0

MRS reads of ERXSTATUS_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERXSTATUS_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERXCTLR_EL1, bit [43]

When FEAT_RAS is implemented:

Trap MRS reads of ERXCTLR_EL1 at EL1 using AArch64 to EL2.

ERXCTLR_EL1Meaning
0b0

MRS reads of ERXCTLR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERXCTLR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERXFR_EL1, bit [42]

When FEAT_RAS is implemented:

Trap MRS reads of ERXFR_EL1 at EL1 using AArch64 to EL2.

ERXFR_EL1Meaning
0b0

MRS reads of ERXFR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERXFR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERRSELR_EL1, bit [41]

When FEAT_RAS is implemented:

Trap MRS reads of ERRSELR_EL1 at EL1 using AArch64 to EL2.

ERRSELR_EL1Meaning
0b0

MRS reads of ERRSELR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERRSELR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ERRIDR_EL1, bit [40]

When FEAT_RAS is implemented:

Trap MRS reads of ERRIDR_EL1 at EL1 using AArch64 to EL2.

ERRIDR_EL1Meaning
0b0

MRS reads of ERRIDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ERRIDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ICC_IGRPENn_EL1, bit [39]

When FEAT_GICv3 is implemented:

Trap MRS reads of ICC_IGRPEN<n>_EL1 at EL1 using AArch64 to EL2.

ICC_IGRPENn_EL1Meaning
0b0

MRS reads of ICC_IGRPEN<n>_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ICC_IGRPEN<n>_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

VBAR_EL1, bit [38]

Trap MRS reads of VBAR_EL1 at EL1 using AArch64 to EL2.

VBAR_EL1Meaning
0b0

MRS reads of VBAR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of VBAR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

TTBR1_EL1, bit [37]

Trap MRS reads of TTBR1_EL1 at EL1 using AArch64 to EL2.

TTBR1_EL1Meaning
0b0

MRS reads of TTBR1_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of TTBR1_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

TTBR0_EL1, bit [36]

Trap MRS reads of TTBR0_EL1 at EL1 using AArch64 to EL2.

TTBR0_EL1Meaning
0b0

MRS reads of TTBR0_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of TTBR0_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

TPIDR_EL0, bit [35]

Trap MRS reads of TPIDR_EL0 at EL1 and EL0 using AArch64 and MRC reads of TPIDRURW at EL0 using AArch32 when EL1 is using AArch64 to EL2.

TPIDR_EL0Meaning
0b0

MRS reads of TPIDR_EL0 at EL1 and EL0 using AArch64 and MRC reads of TPIDRURW at EL0 using AArch32 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state, HCR_EL2.{E2H,TGE} != {1,1}, EL1 is using AArch64, and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then, unless the read generates a higher priority exception:

  • MRS reads of TPIDR_EL0 at EL1 and EL0 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18.
  • MRC reads of TPIDRURW at EL0 using AArch32 are trapped to EL2 and reported with EC syndrome value 0x03.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

TPIDRRO_EL0, bit [34]

Trap MRS reads of TPIDRRO_EL0 at EL1 and EL0 using AArch64 and MRC reads of TPIDRURO at EL0 using AArch32 when EL1 is using AArch64 to EL2.

TPIDRRO_EL0Meaning
0b0

MRS reads of TPIDRRO_EL0 at EL1 and EL0 using AArch64 and MRC reads of TPIDRURO at EL0 using AArch32 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state, HCR_EL2.{E2H,TGE} != {1,1}, EL1 is using AArch64, and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then, unless the read generates a higher priority exception:

  • MRS reads of TPIDRRO_EL0 at EL1 and EL0 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18.
  • MRC reads of TPIDRURO at EL0 using AArch32 are trapped to EL2 and reported with EC syndrome value 0x03.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

TPIDR_EL1, bit [33]

Trap MRS reads of TPIDR_EL1 at EL1 using AArch64 to EL2.

TPIDR_EL1Meaning
0b0

MRS reads of TPIDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of TPIDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

TCR_EL1, bit [32]

Trap MRS reads of TCR_EL1 at EL1 using AArch64 to EL2.

TCR_EL1Meaning
0b0

MRS reads of TCR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of TCR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

SCXTNUM_EL0, bit [31]

When FEAT_CSV2 is implemented:

Trap MRS reads of SCXTNUM_EL0 at EL1 and EL0 using AArch64 to EL2.

SCXTNUM_EL0Meaning
0b0

MRS reads of SCXTNUM_EL0 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state, HCR_EL2.{E2H,TGE} != {1,1}, and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of SCXTNUM_EL0 at EL1 and EL0 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

SCXTNUM_EL1, bit [30]

When FEAT_CSV2 is implemented:

Trap MRS reads of SCXTNUM_EL1 at EL1 using AArch64 to EL2.

SCXTNUM_EL1Meaning
0b0

MRS reads of SCXTNUM_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of SCXTNUM_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

SCTLR_EL1, bit [29]

Trap MRS reads of SCTLR_EL1 at EL1 using AArch64 to EL2.

SCTLR_EL1Meaning
0b0

MRS reads of SCTLR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of SCTLR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

REVIDR_EL1, bit [28]

Trap MRS reads of REVIDR_EL1 at EL1 using AArch64 to EL2.

REVIDR_EL1Meaning
0b0

MRS reads of REVIDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of REVIDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

PAR_EL1, bit [27]

Trap MRS reads of PAR_EL1 at EL1 using AArch64 to EL2.

PAR_EL1Meaning
0b0

MRS reads of PAR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of PAR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

MPIDR_EL1, bit [26]

Trap MRS reads of MPIDR_EL1 at EL1 using AArch64 to EL2.

MPIDR_EL1Meaning
0b0

MRS reads of MPIDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of MPIDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

MIDR_EL1, bit [25]

Trap MRS reads of MIDR_EL1 at EL1 using AArch64 to EL2.

MIDR_EL1Meaning
0b0

MRS reads of MIDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of MIDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

MAIR_EL1, bit [24]

Trap MRS reads of MAIR_EL1 at EL1 using AArch64 to EL2.

MAIR_EL1Meaning
0b0

MRS reads of MAIR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of MAIR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

LORSA_EL1, bit [23]

When FEAT_LOR is implemented:

Trap MRS reads of LORSA_EL1 at EL1 using AArch64 to EL2.

LORSA_EL1Meaning
0b0

MRS reads of LORSA_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of LORSA_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

LORN_EL1, bit [22]

When FEAT_LOR is implemented:

Trap MRS reads of LORN_EL1 at EL1 using AArch64 to EL2.

LORN_EL1Meaning
0b0

MRS reads of LORN_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of LORN_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

LORID_EL1, bit [21]

When FEAT_LOR is implemented:

Trap MRS reads of LORID_EL1 at EL1 using AArch64 to EL2.

LORID_EL1Meaning
0b0

MRS reads of LORID_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of LORID_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

LOREA_EL1, bit [20]

When FEAT_LOR is implemented:

Trap MRS reads of LOREA_EL1 at EL1 using AArch64 to EL2.

LOREA_EL1Meaning
0b0

MRS reads of LOREA_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of LOREA_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

LORC_EL1, bit [19]

When FEAT_LOR is implemented:

Trap MRS reads of LORC_EL1 at EL1 using AArch64 to EL2.

LORC_EL1Meaning
0b0

MRS reads of LORC_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of LORC_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

ISR_EL1, bit [18]

Trap MRS reads of ISR_EL1 at EL1 using AArch64 to EL2.

ISR_EL1Meaning
0b0

MRS reads of ISR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ISR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

FAR_EL1, bit [17]

Trap MRS reads of FAR_EL1 at EL1 using AArch64 to EL2.

FAR_EL1Meaning
0b0

MRS reads of FAR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of FAR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

ESR_EL1, bit [16]

Trap MRS reads of ESR_EL1 at EL1 using AArch64 to EL2.

ESR_EL1Meaning
0b0

MRS reads of ESR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of ESR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

DCZID_EL0, bit [15]

Trap MRS reads of DCZID_EL0 at EL1 and EL0 using AArch64 to EL2.

DCZID_EL0Meaning
0b0

MRS reads of DCZID_EL0 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state, HCR_EL2.{E2H,TGE} != {1,1}, and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of DCZID_EL0 at EL1 and EL0 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

CTR_EL0, bit [14]

Trap MRS reads of CTR_EL0 at EL1 and EL0 using AArch64 to EL2.

CTR_EL0Meaning
0b0

MRS reads of CTR_EL0 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state, HCR_EL2.{E2H,TGE} != {1,1}, and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of CTR_EL0 at EL1 and EL0 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

CSSELR_EL1, bit [13]

Trap MRS reads of CSSELR_EL1 at EL1 using AArch64 to EL2.

CSSELR_EL1Meaning
0b0

MRS reads of CSSELR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of CSSELR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

CPACR_EL1, bit [12]

Trap MRS reads of CPACR_EL1 at EL1 using AArch64 to EL2.

CPACR_EL1Meaning
0b0

MRS reads of CPACR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of CPACR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

CONTEXTIDR_EL1, bit [11]

Trap MRS reads of CONTEXTIDR_EL1 at EL1 using AArch64 to EL2.

CONTEXTIDR_EL1Meaning
0b0

MRS reads of CONTEXTIDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of CONTEXTIDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

CLIDR_EL1, bit [10]

Trap MRS reads of CLIDR_EL1 at EL1 using AArch64 to EL2.

CLIDR_EL1Meaning
0b0

MRS reads of CLIDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of CLIDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

CCSIDR_EL1, bit [9]

Trap MRS reads of CCSIDR_EL1 at EL1 using AArch64 to EL2.

CCSIDR_EL1Meaning
0b0

MRS reads of CCSIDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of CCSIDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

APIBKey, bit [8]

When FEAT_PAuth is implemented:

Trap MRS reads of multiple System registers. Enables a trap on MRS reads at EL1 using AArch64 of any of the following AArch64 System registers to EL2:

APIBKeyMeaning
0b0

MRS reads of the System registers listed above are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads at EL1 using AArch64 of any of the System registers listed above are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

APIAKey, bit [7]

When FEAT_PAuth is implemented:

Trap MRS reads of multiple System registers. Enables a trap on MRS reads at EL1 using AArch64 of any of the following AArch64 System registers to EL2:

APIAKeyMeaning
0b0

MRS reads of the System registers listed above are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads at EL1 using AArch64 of any of the System registers listed above are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

APGAKey, bit [6]

When FEAT_PAuth is implemented:

Trap MRS reads of multiple System registers. Enables a trap on MRS reads at EL1 using AArch64 of any of the following AArch64 System registers to EL2:

APGAKeyMeaning
0b0

MRS reads of the System registers listed above are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads at EL1 using AArch64 of any of the System registers listed above are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

APDBKey, bit [5]

When FEAT_PAuth is implemented:

Trap MRS reads of multiple System registers. Enables a trap on MRS reads at EL1 using AArch64 of any of the following AArch64 System registers to EL2:

APDBKeyMeaning
0b0

MRS reads of the System registers listed above are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads at EL1 using AArch64 of any of the System registers listed above are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

APDAKey, bit [4]

When FEAT_PAuth is implemented:

Trap MRS reads of multiple System registers. Enables a trap on MRS reads at EL1 using AArch64 of any of the following AArch64 System registers to EL2:

APDAKeyMeaning
0b0

MRS reads of the System registers listed above are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads at EL1 using AArch64 of any of the System registers listed above are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.


Otherwise:

Reserved, RES0.

AMAIR_EL1, bit [3]

Trap MRS reads of AMAIR_EL1 at EL1 using AArch64 to EL2.

AMAIR_EL1Meaning
0b0

MRS reads of AMAIR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of AMAIR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

AIDR_EL1, bit [2]

Trap MRS reads of AIDR_EL1 at EL1 using AArch64 to EL2.

AIDR_EL1Meaning
0b0

MRS reads of AIDR_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of AIDR_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

AFSR1_EL1, bit [1]

Trap MRS reads of AFSR1_EL1 at EL1 using AArch64 to EL2.

AFSR1_EL1Meaning
0b0

MRS reads of AFSR1_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of AFSR1_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

AFSR0_EL1, bit [0]

Trap MRS reads of AFSR0_EL1 at EL1 using AArch64 to EL2.

AFSR0_EL1Meaning
0b0

MRS reads of AFSR0_EL1 are not affected by this bit.

0b1

If EL2 is implemented and enabled in the current Security state and either EL3 is not implemented or SCR_EL3.FGTEn == 0b1, then MRS reads of AFSR0_EL1 at EL1 using AArch64 are trapped to EL2 and reported with EC syndrome value 0x18, unless the read generates a higher priority exception.

On a Warm reset, in a system where the PE resets into EL2, this field resets to 0.

Accessing the HFGRTR_EL2

Accesses to this register use the following encodings:

MRS <Xt>, HFGRTR_EL2

op0op1CRnCRmop2
0b110b1000b00010b00010b100
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.<NV2,NV> == '11' then
        return NVMem[0x1B8];
    elsif EL2Enabled() && HCR_EL2.NV == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && SCR_EL3.FGTEn == '0' then
        UNDEFINED;
    elsif HaveEL(EL3) && SCR_EL3.FGTEn == '0' then
        if Halted() && EDSCR.SDD == '1' then
            UNDEFINED;
        else
            AArch64.SystemAccessTrap(EL3, 0x18);
    else
        return HFGRTR_EL2;
elsif PSTATE.EL == EL3 then
    return HFGRTR_EL2;

MSR HFGRTR_EL2, <Xt>

op0op1CRnCRmop2
0b110b1000b00010b00010b100
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.<NV2,NV> == '11' then
        NVMem[0x1B8] = X[t];
    elsif EL2Enabled() && HCR_EL2.NV == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && SCR_EL3.FGTEn == '0' then
        UNDEFINED;
    elsif HaveEL(EL3) && SCR_EL3.FGTEn == '0' then
        if Halted() && EDSCR.SDD == '1' then
            UNDEFINED;
        else
            AArch64.SystemAccessTrap(EL3, 0x18);
    else
        HFGRTR_EL2 = X[t];
elsif PSTATE.EL == EL3 then
    HFGRTR_EL2 = X[t];


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