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GICR_ICFGR0, Interrupt Configuration Register 0

The GICR_ICFGR0 characteristics are:

Purpose

Determines whether the corresponding SGI is edge-triggered or level-sensitive.

Configuration

RW fields in this register reset to architecturally UNKNOWN values.

A copy of this register is provided for each Redistributor.

Attributes

GICR_ICFGR0 is a 32-bit register.

Field descriptions

The GICR_ICFGR0 bit assignments are:

313029282726252423222120191817161514131211109876543210
Int_config<x>, bits [2x+1:2x], for x = 0 to 15

Int_config<x>, bits [2x+1:2x], for x = 0 to 15

Indicates whether the interrupt with ID 16n + x is level-sensitive or edge-triggered.

Int_config[0] (bit [2x]) is RES0.

Possible values of Int_config[1] (bit [2x+1]) are:

Int_config<x>Meaning
0b00

Corresponding interrupt is level-sensitive.

0b01

Corresponding interrupt is edge-triggered.

For SGIs, Int_config[1] is RAO/WI.

A read of this bit always returns the correct value to indicate the interrupt triggering method.

This field resets to an architecturally UNKNOWN value.

Accessing the GICR_ICFGR0

This register is used when affinity routing is enabled.

When affinity routing is disabled for the Security state of an interrupt, the field for that interrupt is RES0 and an implementation is permitted to make the field RAZ/WI in this case. Equivalent functionality is provided by GICD_ICFGR<n> with n=0.

When GICD_CTLR.DS==0, a register bit that corresponds to a Group 0 or Secure Group 1 interrupt is RAZ/WI to Non-secure accesses.

GICR_ICFGR0 can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
GIC RedistributorSGI_base0x0C00GICR_ICFGR0

This interface is accessible as follows:

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


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