[boot-wrapper,v2,0/8] Add Armv8-R AArch64 support

Message

Jaxson Han May 21, 2021, 10:47 a.m. UTC

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:
Patch 1 allows boot-wrapper to boot on more platforms.
Patch 2 renames some labels as preparations for booting from lower EL.
Patch 3 remove the redundant setup_stack.
Patch 4-5 does some preparations for lower EL booting.
Patch 6 prepares for GICv3 initialization with EL2.
Patch 7 adds necessary EL2 registers.
Patch 8 adds auto-detection for Armv8-R AArch64 to drop into EL1
before entering the kernel.

Refs: Arm Architecture Reference Manual Supplement - Armv8, for
Armv8-R AArch64 architecture profile.
[https://developer.arm.com/documentation/ddi0600/latest/]

---------
v1 -> v2:
1. Split Patch 2 to Patch 2,3,4.
2. Slightly refine some comments.
3. More checks on Armv8-R AArch64.
4. Force setting HCR_EL2 instead of modifying.

Jaxson Han (8):
  Decouple V2M_SYS config by auto-detect dtb node
  aarch64: Rename labels and prepare for lower EL booting
  aarch64: Remove the redundant setup_stack
  aarch64: Prepare for EL1 booting
  aarch64: Prepare for lower EL booting
  gic-v3: Prepare for gicv3 with EL2
  aarch64: Prepare for booting with EL2
  aarch64: Introduce EL2 boot code for Armv8-R AArch64

 Makefile.am                       |   4 +-
 arch/aarch32/include/asm/gic-v3.h |   7 ++
 arch/aarch64/boot.S               | 146 +++++++++++++++++++++++++++---
 arch/aarch64/include/asm/cpu.h    |   3 +
 arch/aarch64/include/asm/gic-v3.h |  38 +++++++-
 arch/aarch64/psci.S               |  13 +--
 arch/aarch64/spin.S               |   8 +-
 arch/aarch64/utils.S              |  10 +-
 gic-v3.c                          |   2 +-
 platform.c                        |   4 +
 10 files changed, 203 insertions(+), 32 deletions(-)