tree 982455637cecea28d2330b282c22030053cf1feb
parent ca88b5f0aca3b1dce29baa1c57e02d3202dea29c
author Krystian Hebel <krystian.hebel@3mdeb.com> 1715595877 +0200
committer Felix Held <felix-coreboot@felixheld.de> 1716813830 +0000

security/memory_clear: fix wrong size of reserved memory range

The code used to reserve MEMSET_PAE_PGTL_SIZE (20 KiB) for page used
for clearing the memory above 4 GiB that was assumed to be 2 MiB page.
memset_pae() checks only the alignment and not the size of this region,
so no error was reported by it.

In most cases this reserved memory in 2-4 MiB range, and because this
range isn't usually used by coreboot (architectural stuff is located in
lower 1 MiB, coreboot tables and ramstage are close to TOLUM and payload
isn't yet loaded when the broken code is executed), it never caused any
problems.

Change MEMSET_PAE_PGTL_SIZE to MEMSET_PAE_VMEM_SIZE and fix wrong macro
definition to reserve properly sized region.

Change-Id: I0df15b0d1767196fe70be14d94428ccdf8dbd5d3
Signed-off-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82397
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>