GICR_ISACTIVER0, Interrupt Set-Active Register 0
The GICR_ISACTIVER0 characteristics are:
Purpose
Activates the corresponding SGI or PPI. These registers are used when saving and restoring GIC state.
Configuration
A copy of this register is provided for each Redistributor.
Attributes
GICR_ISACTIVER0 is a 32-bit register.
Field descriptions
The GICR_ISACTIVER0 bit assignments are:
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Set_active_bit<x>, bit [x], for x = 0 to 31 | |||||||||||||||||||||||||||||||
Set_active_bit<x>, bit [x], for x = 0 to 31
Adds the active state to interrupt number x. Reads and writes have the following behavior:
| Set_active_bit<x> | Meaning |
|---|---|
| 0b0 |
If read, indicates that the corresponding interrupt is not active, and is not active and pending. If written, has no effect. |
| 0b1 |
If read, indicates that the corresponding interrupt is active, or is active and pending. If written, activates the corresponding interrupt, if the interrupt is not already active. If the interrupt is already active, the write has no effect. After a write of 1 to this bit, a subsequent read of this bit returns 1. |
This field resets to an architecturally UNKNOWN value.
Accessing the GICR_ISACTIVER0
When affinity routing is not enabled for the Security state of an interrupt in GICR_ISACTIVER0, the corresponding bit is RAZ/WI and equivalent functionality is provided by GICD_ISACTIVER<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_ISACTIVER<n>.
When GICD_CTLR.DS == 0, bits corresponding to Secure SGIs and PPIs are RAZ/WI to Non-secure accesses.
GICR_ISACTIVER0 can be accessed through the memory-mapped interfaces:
| Component | Frame | Offset | Instance |
|---|---|---|---|
| GIC Redistributor | SGI_base | 0x0300 | GICR_ISACTIVER0 |
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.