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In x86_64 code every function call consumes 32byte of stack with no stack local variables being used. That limits the function call depth in SMM to 32 or less. Double the stack size to prevent overwriting the stack canary as seen on HP8200 and x86_64 enabled. Change-Id: Iee202ba2ae609a474d0eb3b06f49690f33f4eda8 Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/55449 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>