arch/x86,cpu/x86: Fix 64-bit CPU_INFO_V2 build errors

There are two possible code sections where the cpu_info macros can be
included: .code32 and .code64

Doing a `push %eax` while in a .code64 section will result in a compiler
error. This macro manually pushes the 32-bit register onto the stack so
we can share the code between 32 and 64 bit builds.

We also can't implicitly dereference per_cpu_segment_selector because
it's a 32-bit address. Trying to do this results in the following:
  E: Invalid reloc type: 11
  E: Illegal use of 32bit sign extended addressing at offset 0x1b2

If we load the address first, then dereference it, we can work around
the limitation.

With these fixes, 64-bit builds can now use CPU_INFO_V2.

BUG=b:179699789
TEST=Boot qemu 64 bit build with CPU_INFO_V2 and 4 CPUs. See AP init
work as expected.

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I4e72a808c9583bb2d0f697cbbd9cb9c0aa0ea2dc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58232
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

0 files changed, 0 insertions, 0 deletions