tree 991906677d9d0dda6586e6e4df0fa140ac9a31fc
parent 1c6ac5e25eda9c2743c042c8eb7a576b686f25b2
author Mark Rutland <mark.rutland@arm.com> 1627560230 +0100
committer Mark Rutland <mark.rutland@arm.com> 1643300083 +0000

Rework bootmethod initialization

We currently initialize the bootmethod late, in assembly code. This
requires us to maintain the el3/no_el3 distintion late into the boot
process, and means we cannot produce any helpful diagnostic when booted
at an unexpected exception level.

Rework things so that we initialize the bootmethod early, with a warning
when things are wrong. The el3/no_el3 distinction is now irrelevant to
the bootmethod code, and can be removed in subsequent patches.

When a boot-wrapper configured for PSCI is entered at EL2, a warning is
looged to the serial console as:

| Boot-wrapper v0.2
| Entered at EL2
| Memory layout:
| [0000000080000000..0000000080001f90] => boot-wrapper
| [000000008000fff8..0000000080010000] => mbox
| [0000000080200000..00000000822af200] => kernel
| [0000000088000000..0000000088002857] => dtb
|
| WARNING: PSCI could not be initialized. Boot may fail

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>