B2.87 LORSA_EL1, LORegion Start Address Register, EL1

The LORSA_EL1 register indicates whether the current LORegion descriptor selected by LORC_EL1.DS is is enabled, and holds the physical address of the start of the LORegion.

Bit field descriptions

LORSA_EL1 is a 64-bit register and is part of the Virtual memory control registers functional group.

Figure B2-74 LORSA_EL1 bit assignments
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RES0, [63:48]
Reserved, RES0.
SA, [47:16]
Start physical address bits.
RES0, [15:1]
Reserved, RES0.
Valid, [0]

Valid. Indicates whether the LORegion Descriptor is enabled. The possible values are:

0Not valid. This is the reset value.
1Valid.
Configurations

The LORSA_EL1 register is only applicable to the AArch64 state and is not accessible at any exception level in AArch32.

If no LORegion descriptors are supported by the core, then this register is res0.

If LORC_EL1.DS points to a LORegion that is not supported by the core, then this register is res0.

RW fields in this register reset to architecturally unknown values.

Bit fields and details not provided in this description are architecturally defined. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile.

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