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GICV_RPR, Virtual Machine Running Priority Register

The GICV_RPR characteristics are:

Purpose

This register indicates the running priority of the virtual CPU interface.

This register corresponds to the physical CPU interface register GICC_RPR.

Configuration

This register is available when the GIC implementation supports interrupt virtualization.

Attributes

GICV_RPR is a 32-bit register.

Field descriptions

The GICV_RPR bit assignments are:

313029282726252423222120191817161514131211109876543210
RES0Priority

Bits [31:8]

Reserved, RES0.

Priority, bits [7:0]

The current running priority on the virtual CPU interface. This is the group priority of the current active interrupt.

If there are no active interrupts on the CPU interface, or all active interrupts have undergone a priority drop, the value returned is the Idle priority.

The priority returned is the group priority as if the BPR was set to the minimum value.

Accessing the GICV_RPR

This register is used only when System register access is not enabled. When System register access is enabled:

  • For AArch32 implementations, ICC_RPR provides equivalent functionality.
  • For AArch64 implementations, ICC_RPR_EL1 provides equivalent functionality.

Depending on the implementation, if no bits are set to 1 in GICH_APR<n>, indicating no active virtual interrupts in the virtual CPU interface, the priority reads as 0xFF or 0xF8 to reflect the number of supported interrupt priority bits defined by GICH_VTR.PRIbits.

GICV_RPR can be accessed through the memory-mapped interfaces:

ComponentOffsetInstance
GIC Virtual CPU interface0x0014GICV_RPR

This interface is accessible as follows:

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


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