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GICR_PROPBASER, Redistributor Properties Base Address Register

The GICR_PROPBASER characteristics are:

Purpose

Specifies the base address of the LPI Configuration table, and the Shareability and Cacheability of accesses to the LPI Configuration table.

Configuration

RW fields in this register reset to architecturally UNKNOWN values.

A copy of this register is provided for each Redistributor.

An implementation might make this register RO, for example to correspond to an LPI Configuration table in read-only memory.

Attributes

GICR_PROPBASER is a 64-bit register.

Field descriptions

The GICR_PROPBASER bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
RES0OuterCacheRES0Physical_Address
Physical_AddressShareabilityInnerCacheRES0IDbits
313029282726252423222120191817161514131211109876543210

Bits [63:59]

Reserved, RES0.

OuterCache, bits [58:56]

Indicates the Outer Cacheability attributes of accesses to the LPI Configuration table. The possible values of this field are:

OuterCacheMeaning
0b000

Memory type defined in InnerCache field. For Normal memory, Outer Cacheability is the same as Inner Cacheability.

0b001

Normal Outer Non-cacheable.

0b010

Normal Outer Cacheable Read-allocate, Write-through.

0b011

Normal Outer Cacheable Read-allocate, Write-back.

0b100

Normal Outer Cacheable Write-allocate, Write-through.

0b101

Normal Outer Cacheable Write-allocate, Write-back.

0b110

Normal Outer Cacheable Read-allocate, Write-allocate, Write-through.

0b111

Normal Outer Cacheable Read-allocate, Write-allocate, Write-back.

It is IMPLEMENTATION DEFINED whether this field has a fixed value or can be programmed by software. Implementing this field with a fixed value is deprecated.

This field resets to an architecturally UNKNOWN value.

Bits [55:52]

Reserved, RES0.

Physical_Address, bits [51:12]

Bits [51:12] of the physical address containing the LPI Configuration table.

In implementations supporting fewer than 52 bits of physical address, unimplemented upper bits are RES0.

This field resets to an architecturally UNKNOWN value.

Shareability, bits [11:10]

Indicates the Shareability attributes of accesses to the LPI Configuration table. The possible values of this field are:

ShareabilityMeaning
0b00

Non-shareable.

0b01

Inner Shareable.

0b10

Outer Shareable.

0b11

Reserved. Treated as 0b00.

It is IMPLEMENTATION DEFINED whether this field has a fixed value or can be programmed by software. Implementing this field with a fixed value is deprecated.

This field resets to an architecturally UNKNOWN value.

InnerCache, bits [9:7]

Indicates the Inner Cacheability attributes of accesses to the LPI Configuration table. The possible values of this field are:

InnerCacheMeaning
0b000

Device-nGnRnE.

0b001

Normal Inner Non-cacheable.

0b010

Normal Inner Cacheable Read-allocate, Write-through.

0b011

Normal Inner Cacheable Read-allocate, Write-back.

0b100

Normal Inner Cacheable Write-allocate, Write-through.

0b101

Normal Inner Cacheable Write-allocate, Write-back.

0b110

Normal Inner Cacheable Read-allocate, Write-allocate, Write-through.

0b111

Normal Inner Cacheable Read-allocate, Write-allocate, Write-back.

This field resets to an architecturally UNKNOWN value.

Bits [6:5]

Reserved, RES0.

IDbits, bits [4:0]

The number of bits of LPI INTID supported, minus one, by the LPI Configuration table starting at Physical_Address.

If the value of this field is larger than the value of GICD_TYPER.IDbits, the GICD_TYPER.IDbits value applies.

If the value of this field is less than 0b1101, indicating that the largest INTID is less than 8192 (the smallest LPI interrupt ID), the GIC will behave as if all physical LPIs are out of range.

This field resets to an architecturally UNKNOWN value.

Accessing the GICR_PROPBASER

It is IMPLEMENTATION DEFINED whether GICR_PROPBASER can be set to different values on different Redistributors. GICR_TYPER.CommonLPIAff identifies the Redistributors that must have GICR_PROPBASER set to the same values whenever GICR_CTLR.EnableLPIs == 1.

Setting different values in different copies of GICR_PROPBASER on Redistributors that are required to use a common LPI Configuration table when GICR_CTLR.EnableLPIs == 1 leads to UNPREDICTABLE behavior.

Other restrictions apply when a Redistributor caches information from GICR_PROPBASER. See LPI Configuration tables for more information.

GICR_PROPBASER can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
GIC RedistributorRD_base0x0070GICR_PROPBASER

This interface is accessible as follows:

  • When GICD_CTLR.DS == 0b0 accesses to this register are RW.
  • When IsAccessSecure() accesses to this register are RW.
  • When !IsAccessSecure() accesses to this register are RW.


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