GICR_ISENABLER0, Interrupt Set-Enable Register 0

The GICR_ISENABLER0 characteristics are:

Purpose

Enables forwarding of the corresponding SGI or PPI to the CPU interfaces.

This register is part of the GIC Redistributor registers functional group.

Usage constraints

This register is accessible as follows:

Security disabledSecureNon-secure
RWRWRW

When affinity routing is not enabled for the Security state of an interrupt in GICR_ISENABLER0, the corresponding bit is RAZ/WI and equivalent functionality is provided by GICD_ISENABLER<n> with n=0.

This register only applies to SGIs (bits [15:0]) and PPIs (bits [31:16]). For SPIs, this functionality is provided by GICD_ISENABLER<n>.

When GICD_CTLR.DS == 0, bits corresponding to Secure SGIs and PPIs are RAZ/WI to Non-secure accesses.

Configuration

Some or all RW fields of this register have defined reset values.

A copy of this register is provided for each Redistributor.

Attributes

GICR_ISENABLER0 is a 32-bit register.

Field descriptions

The GICR_ISENABLER0 bit assignments are:

313029282726252423222120191817161514131211109876543210
Set_enable_bit<x>, bit [x], for x = 0 to 31

Set_enable_bit<x>, bit [x], for x = 0 to 31

For PPIs and SGIs, controls the forwarding of interrupt number x to the CPU interface. Reads and writes have the following behavior:

Set_enable_bit<x>Meaning
0

If read, indicates that forwarding of the corresponding interrupt is disabled.

If written, has no effect.

1

If read, indicates that forwarding of the corresponding interrupt is enabled.

If written, enables forwarding of the corresponding interrupt.

After a write of 1 to this bit, a subsequent read of this bit returns 1.

When this register has an architecturally-defined reset value, this field resets to 0.

Accessing the GICR_ISENABLER0

GICR_ISENABLER0 can be accessed through its memory-mapped interface:

ComponentFrameOffset
GIC RedistributorSGI_base 0x0100



28/09/2017 08:24

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