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authorPatrick Rudolph <patrick.rudolph@9elements.com>2019-12-01 07:04:04 +0100
committerPatrick Georgi <pgeorgi@google.com>2020-08-18 08:49:57 +0000
commit24bb8036c90feb8c2f45f59cce15eec7792a6393 (patch)
tree9938a69ddb8c1e6bf9f9185a69bae69977d55f0b /src/ec/compal/ene932
parent5eeead2d73d2daa2361d0272db41e85e1de79a6c (diff)
cpu/x86/smm/smm_stub: Add x86_64 support
Enable long mode in SMM handler. x86_32 isn't affected by this change. * Enter long mode * Add 64bit entry to GDT * Use x86_64 SysV ABI calling conventions for C code entry * Change smm_module_params' cpu to size_t as 'push' is native integer * Drop to protected mode after c handler NOTE: This commit does NOT introduce a new security model. It uses the same page tables as the remaining firmware does. This can be a security risk if someone is able to manipulate the page tables stored in ROM at runtime. USE FOR TESTING ONLY! Tested on Lenovo T410 with additional x86_64 patches. Change-Id: I26300492e4be62ddd5d80525022c758a019d63a1 Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37392 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-by: Eugene Myers <cedarhouse1@comcast.net>
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