UefiCpuPkg PiSmmCpuDxeSmm: Update X64/MpFuncs.nasm

Use 16bit and 32bit assembly code to replace hard code db.

In V2: add 0x67 prefixes to far jumps

Without the a32 modifier under FLAT32_JUMP, and the a16 modifier under
LONG_JUMP, nasm doesn't generate the 0x67 prefixes, and the far jumps
don't work. (For the former, KVM returns an emulation failure. For the
latter, KVM performs a triple fault (guest reboot).) By forcing the 0x67
prefixes we end up with the same machine code as the one open-coded in
"MpFuncs.asm".

This bug breaks S3 resume in the Ia32X64 + SMM_REQUIRE build of OVMF.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

0 files changed, 0 insertions, 0 deletions