feat(arm_fpga): determine GICR base by probing
When an Arm Ltd GIC (Arm GIC-00) is instantiated with one or more
ITSes, the ITS MMIO frames appear between the distributor and
redistributor addresses. This makes the beginning of the redistributor
region dependent on the existence and number of ITSes.
To support various FPGA images, with and without ITSes, probe the
addresses in question, to learn whether they accommodate an ITS or a
redistributor. This can be safely done by looking at the PIDR
registers, which contain an ID code for each region, documented in the
Arm GIC TRMs.
We try to find all ITSes instantiated, and skip either two or four 64K
frames, depending on GICv4.1 support. At some point we will find the
first redistributor; this address we then update in the DTB.
Signed-off-by: Andre Przywara <firstname.lastname@example.org>
4 files changed