GICD_ISPENDR<n>, Interrupt Set-Pending Registers, n = 0 - 31
The GICD_ISPENDR<n> characteristics are:
Adds the pending state to the corresponding interrupt.
These registers are available in all GIC configurations. If GICD_CTLR.DS==0, these registers are Common.
GICD_ISPENDR0 is Banked for each connected PE with GICR_TYPER.Processor_Number < 8.
Accessing GICD_ISPENDR0 from a PE with GICR_TYPER.Processor_Number > 7 is CONSTRAINED UNPREDICTABLE:
- Register is RAZ/WI.
- An UNKNOWN banked copy of the register is accessed.
GICD_ISPENDR<n> is a 32-bit register.
The GICD_ISPENDR<n> bit assignments are:
|Set_pending_bit<x>, bit [x], for x = 0 to 31|
Set_pending_bit<x>, bit [x], for x = 0 to 31
For SPIs and PPIs, adds the pending state to interrupt number 32n + x. Reads and writes have the following behavior:
If read, indicates that the corresponding interrupt is not pending on any PE.
If written, has no effect.
If read, indicates that the corresponding interrupt is pending, or active and pending:
If written, changes the state of the corresponding interrupt from inactive to pending, or from active to active and pending. This has no effect in the following cases:
This field resets to 0.
Accessing the GICD_ISPENDR<n>
Set-pending bits for SGIs are read-only and ignore writes. The Set-pending bits for SGIs are provided as GICD_SPENDSGIR<n>.
When affinity routing is enabled for the Security state of an interrupt:
- Bits corresponding to SGIs and PPIs are RAZ/WI, and equivalent functionality for SGIs and PPIs is provided by GICR_ISPENDR0.
- Bits corresponding to Group 0 and Group 1 Secure interrupts can only be set by Secure accesses.
Bits corresponding to unimplemented interrupts are RAZ/WI.
If GICD_CTLR.DS==0, unless the GICD_NSACR<n> registers permit Non-secure software to control Group 0 and Secure Group 1 interrupts, any bits that correspond to Group 0 or Secure Group 1 interrupts are accessible only by Secure accesses and are RAZ/WI to Non-secure accesses.
GICD_ISPENDR<n> can be accessed through the memory-mapped interfaces:
|GIC Distributor||0x0200 + (4 * n)||GICD_ISPENDR<n>|
This interface is accessible as follows:
- When GICD_CTLR.DS == 0 accesses to this register are RW.
- When an access is Secure accesses to this register are RW.
- When an access is Non-secure accesses to this register are RW.