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Kernel/aarch64: Execute kernel with SP_EL1 instead of SP_EL0

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Until now the kernel was always executing with SP_EL0, as this made the
initial dropping to EL1 a bit easier. This commit changes this behaviour
to use the corresponding SP_ELx for each exception level.

To make sure that the execution of the C++ code can continue, the
current stack pointer is copied into the corresponding SP_ELx just
before dropping an exception level.
This commit is contained in:
Timon Kruiper 2023-01-08 14:01:31 +01:00 • committed by Andreas Kling
parent 05659debd1
commit 247109cee6
5 changed files with 23 additions and 20 deletions
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1
Kernel/Arch/aarch64/boot.S
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@ -18,7 +18,6 @@ start:
// Let stack start before .text for now.
// 512 kiB (0x80000) of stack are probably not sufficient, especially once we give the other cores some stack too,
// but for now it's ok.
msr SPSel, #0 //Use the same SP as we descend into EL1
adrp x14, start
add x14, x14, :lo12:start
mov sp, x14