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Kernel/aarch64: Use relative addressing in boot.S

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As the kernel is now linked at high address in virtual memory, we cannot
use absolute addresses as they refer to high addresses in virtual
memory. At this point in the boot process we are still running with the
MMU off, so we have to make sure the accesses are using physical memory
addresses.
This commit is contained in:
Timon Kruiper 2023-01-06 14:50:05 +01:00 committed by Linus Groh
parent a581cae4d4
commit 91d0451999
1 changed files with 4 additions and 2 deletions
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6
Kernel/Arch/aarch64/boot.S
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@ -19,11 +19,13 @@ start:
// 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
ldr x14, =start
adrp x14, start
add x14, x14, :lo12:start
mov sp, x14
// Clear BSS.
ldr x14, =start_of_bss
adrp x14, start_of_bss
add x14, x14, :lo12:start_of_bss
ldr x15, =size_of_bss_divided_by_8
Lbss_clear_loop:
str xzr, [x14], #8