Patrick Rudolph uploaded patch set #5 to the change originally created by Patrick Rudolph.

View Change

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>
---
M src/cpu/x86/smm/smm_stub.S
M src/include/cpu/x86/smm.h
2 files changed, 46 insertions(+), 5 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/92/37392/5

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