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arm64: head: Clear BSS and the kernel page tables in one go

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We will move the CPU feature overrides into BSS in a subsequent patch,
and this requires that BSS is zeroed before the feature override
detection code runs. So let's map BSS read-write in the ID map, and zero
it via this mapping.

Since the kernel page tables are right next to it, and also zeroed via
the ID map, let's drop the separate clear_page_tables() function, and
just zero everything in one go.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240214122845.2033971-51-ardb+git@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ard Biesheuvel
2024-02-14 13:28:52 +01:00
committed by Catalin Marinas
parent 9c4cd2a7d1
commit aa99aad798
2 changed files with 14 additions and 22 deletions
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3
arch/arm64/kernel/vmlinux.lds.S
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@@ -311,12 +311,15 @@ SECTIONS
__pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin);
_edata = .;
/* start of zero-init region */
BSS_SECTION(SBSS_ALIGN, 0, 0)
. = ALIGN(PAGE_SIZE);
init_pg_dir = .;
. += INIT_DIR_SIZE;
init_pg_end = .;
/* end of zero-init region */
#ifdef CONFIG_RELOCATABLE
. += SZ_4K; /* stack for the early relocation code */
early_init_stack = .;