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libpayload/arch/arm64/mmu: Add CB_MEM_TAG to usedmem_ranges

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CB_MEM_TAG is considered as an reserved memory. But we want to mange
this region in the payload and release this region when MTE is inactive.
Add CB_MEM_TAG memory range to usedmem_ranges to get a page table
mapping and mark it as used.

BUG=b:438666196,b:474306129
TEST=Check the tag region is wiped out in DEV mode.

Change-Id: I498407cbd44b1cc70ef769a63b8e40665ea67b28
Signed-off-by: Yidi Lin <yidilin@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90702
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Yidi Lin 2026-01-08 22:23:24 +08:00
commit e705c39009
1 changed files with 1 additions and 0 deletions
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payloads/libpayload/arch/arm64/mmu.c
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@ -611,6 +611,7 @@ static void mmu_extract_ranges(struct memrange *cb_ranges,
switch (cb_ranges[i].type) {
case CB_MEM_TABLE:
case CB_MEM_TAG:
/* Mark this memrange as used memory */
if (mmu_add_memrange(&usedmem_ranges, base, size,
TYPE_NORMAL_MEM) == NULL)