x86/boot: Move early kernel mapping code into startup/

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The startup code that constructs the kernel virtual mapping runs from
the 1:1 mapping of memory itself, and therefore, cannot use absolute
symbol references. Before making changes in subsequent patches, move
this code into a separate source file under arch/x86/boot/startup/ where
all such code will be kept from now on.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Dionna Amalie Glaze <dionnaglaze@google.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Loughlin <kevinloughlin@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: linux-efi@vger.kernel.org
Link: https://lore.kernel.org/r/20250410134117.3713574-16-ardb+git@google.com

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Ard Biesheuvel 2025-04-10 15:41:21 +02:00 • committed by Ingo Molnar

parent 4cecebf200

commit dbe0ad775c

3 changed files with 226 additions and 211 deletions

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2

arch/x86/boot/startup/Makefile

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224

arch/x86/boot/startup/map_kernel.c

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211

arch/x86/kernel/head64.c

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