diff options
| author | David Milosevic <David.Milosevic@9elements.com> | 2023-04-27 02:12:31 +0200 |
|---|---|---|
| committer | Werner Zeh <werner.zeh@siemens.com> | 2024-04-22 07:35:36 +0000 |
| commit | 41ba11229a80eb19d97c8052aff1861478ee2486 (patch) | |
| tree | 9b6f1803e5854e577a68959e679187e8e4c88c3c /src/arch/arm64/boot.c | |
| parent | 93cbbbfc7f32f62b1d20027541122c17e575ced6 (diff) | |
arch/arm64: Add EL1/EL2/EL3 support for arm64
Currently, arch/arm64 requires coreboot to run on EL3 due
to EL3 register access. This might be an issue when, for example,
one boots into TF-A first and drops into EL2 for coreboot afterwards.
This patch aims at making arch/arm64 more versatile by removing the
current EL3 constraint and allowing arm64 coreboot to run on EL1,
EL2 and EL3.
The strategy here, is to add a Kconfig option (ARM64_CURRENT_EL) which
lets us specify coreboot's EL upon entry. Based on that, we access the
appropriate ELx registers. So, for example, when running coreboot on
EL1, we would not access vbar_el3 or vbar_el2 but instead vbar_el1.
This way, we don't generate faults when accessing higher-EL registers.
Currently only tested on the qemu-aarch64 target. Exceptions were
tested by enabling FATAL_ASSERTS.
Signed-off-by: David Milosevic <David.Milosevic@9elements.com>
Change-Id: Iae1c57f0846c8d0585384f7e54102a837e701e7e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74798
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: ron minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Diffstat (limited to 'src/arch/arm64/boot.c')
| -rw-r--r-- | src/arch/arm64/boot.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/arch/arm64/boot.c b/src/arch/arm64/boot.c index 89668e85b9..7a8060fa49 100644 --- a/src/arch/arm64/boot.c +++ b/src/arch/arm64/boot.c @@ -18,8 +18,10 @@ static void run_payload(struct prog *prog) if (CONFIG(ARM64_USE_ARM_TRUSTED_FIRMWARE)) run_bl31((u64)doit, (u64)arg, payload_spsr); - else + else if (CONFIG_ARM64_CURRENT_EL == EL3) transition_to_el2(doit, arg, payload_spsr); + else + doit(arg); } void arch_prog_run(struct prog *prog) |