[boot-wrapper v3 0/4] Add Armv8-R AArch64 support

[Luca Fancellu <luca.fancellu@arm.com>]

Currently, we cannot boot Linux with boot-wrapper on Armv8-R AArch64:
1. The Armv8-R AArch64 profile does not support the EL3.
2. The Armv8-R AArch64 EL2 only supports a PMSA, which Linux does not
support. So it's necessary to drop into EL1 before entering the kernel.
3. There is no EL2 booting code for Armv8-R AArch64 and no
configuration for dropping to EL1 in boot-wrapper.

These patches enable boot-wrapper booting Linux with Armv8-R AArch64.

This work took inspiration from a serie already present upstream [1].

[1] https://patchwork.kernel.org/project/linux-arm-kernel/cover/20210525062509.201464-1-jaxson.han@arm.com/

Changes from v2:
 - Now this work is based on this serie:
   https://patchwork.kernel.org/project/linux-arm-kernel/cover/20240729161501.1806271-1-mark.rutland@arm.com/
   Given the major rework, dropped every R-by.
Changes from v1:
 - Dropped patch 4 regarding GIC changes, it's not needed anymore.

Luca Fancellu (4):
  Introduce --with-bw-arch for boot-wrapper compile arch
  aarch64: Enable Armv8-R EL2 boot
  aarch64: Implement PSCI for Armv8-R
  aarch64: Start Xen on Armv8-R at EL2

 Makefile.am                    |  7 +++-
 arch/aarch64/boot.S            |  5 +++
 arch/aarch64/include/asm/cpu.h | 24 ++++++++++++
 arch/aarch64/init.c            | 69 ++++++++++++++++++++++++++++++++--
 configure.ac                   | 20 ++++++++--
 5 files changed, 118 insertions(+), 7 deletions(-)

-- 
2.34.1