[S] Change in coreboot[master]: arm64: mmu: Spot check security state for TTB mapping

[Elyes Haouas (Code Review)]

Attention is currently required from: Julius Werner.

Elyes Haouas has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/28017 )

Change subject: arm64: mmu: Spot check security state for TTB mapping
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Patch Set 2:

(1 comment)

File src/arch/arm64/armv8/mmu.c:

https://review.coreboot.org/c/coreboot/+/28017/comment/4d48a54f_0a09f033 
PS2, Line 324: assert_correct_ttb_mapping(_ettb - 1);
that gives me using gcc-12.2:

CC         romstage/arch/arm64/armv8/mmu.o
src/arch/arm64/armv8/mmu.c: In function 'mmu_enable':
src/arch/arm64/armv8/mmu.c:296:9: error: array subscript -1 is outside array bounds of 'u8[]' {aka 'unsigned char[]'} [-Werror=array-bounds]
  296 |         assert_correct_ttb_mapping(_ettb - 1);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from src/arch/arm64/armv8/mmu.c:6:
src/include/symbols.h:14:19: note: at offset -1 into object '_ettb' of size [0, 9223372036854775807]
   14 |         extern u8 _e##name[];   \
      |                   ^~
src/include/symbols.h:70:1: note: in expansion of macro 'DECLARE_REGION'
   70 | DECLARE_REGION(ttb)
      | ^~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [Makefile:392 : build/romstage/arch/arm64/armv8/mmu.o] Erreur 1