tree 02e024f7f95da9b256d73d384a98942e14c07707
parent be53d5e824d61c65dcdb0ff99645a4031ec894aa
author Bin Meng <bmeng.cn@gmail.com> 1627721126 +0800
committer Bin Meng <bmeng.cn@gmail.com> 1627888301 +0800

x86: mtrr: Abort if requested size is not power of 2

The size parameter of mtrr_add_request() and mtrr_set_next_var()
shall be power of 2, otherwise the logic creates a mask that does
not meet the requirement of IA32_MTRR_PHYSMASK register.

Programming such a mask value to IA32_MTRR_PHYSMASK generates #GP.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested on chromebook_coral, chromebook_samus, chromebook_link, minnowmax
Tested-by: Simon Glass <sjg@chromium.org>