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arm64: head: Move early kernel mapping routines into C code

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The asm version of the kernel mapping code works fine for creating a
coarse grained identity map, but for mapping the kernel down to its
exact boundaries with the right attributes, it is not suitable. This is
why we create a preliminary RWX kernel mapping first, and then rebuild
it from scratch later on.

So let's reimplement this in C, in a way that will make it unnecessary
to create the kernel page tables yet another time in paging_init().

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-63-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ard Biesheuvel
2024-02-14 13:29:04 +01:00
committed by Catalin Marinas
parent 82ca151da7
commit 97a6f43bb0
15 changed files with 315 additions and 121 deletions
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4
arch/arm64/kernel/vmlinux.lds.S
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@@ -126,9 +126,9 @@ jiffies = jiffies_64;
#ifdef CONFIG_UNWIND_TABLES
#define UNWIND_DATA_SECTIONS \
.eh_frame : { \
__eh_frame_start = .; \
__pi___eh_frame_start = .; \
*(.eh_frame) \
__eh_frame_end = .; \
__pi___eh_frame_end = .; \
}
#else
#define UNWIND_DATA_SECTIONS