Re: [edk2-devel] [edk2-devel202105 PATCH v2 1/1] ArmPkg/ArmGic: Fix maximum number of interrupts in GICv3

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 5/24/21 3:01 PM, Sami Mujawar wrote:
> From: Andreas Sandberg <andreas.sandberg@arm.com>
> 
> Bugzilla: 3415 (https://bugzilla.tianocore.org/show_bug.cgi?id=3415)
> 
> The GICv3 architecture supports up to 1020 ordinary interrupt
> lines. The actual number of interrupts supported is described by the
> ITLinesNumber field in the GICD_TYPER register. The total number of
> implemented registers is normally calculated as
> 32*(ITLinesNumber+1). However, maximum value (0x1f) is a special case
> since that would indicate that 1024 interrupts are implemented.
> 
> Add handling for this special case in ArmGicGetMaxNumInterrupts.
> 
> Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
> Signed-off-by: Joey Gouly <joey.gouly@arm.com>
> Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
> ---
> The changes can be seen at:
> https://github.com/samimujawar/edk2/tree/1396_gic_max_num_intr_v2
> 
> Notes:
>     v2:
>       - Fix comment style.                                   [Laszlo]
>       - Updated comment style.                               [Sami]
> 
>  ArmPkg/Drivers/ArmGic/ArmGicLib.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)

Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>