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| author | Laszlo Ersek <lersek@redhat.com> | 2020-12-17 09:50:55 +0100 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-12-18 11:20:55 +0000 |
| commit | 089285b42c69b3e105070a3deb349eaf1c50d35b (patch) | |
| tree | e1660162ab03831e550a3c7bc51b1983fd535762 /UefiCpuPkg | |
| parent | 96201ae7bf97c3a2c0ef386110bb93d25e9af1ba (diff) | |
| download | edk2-089285b42c69b3e105070a3deb349eaf1c50d35b.tar.gz edk2-089285b42c69b3e105070a3deb349eaf1c50d35b.tar.bz2 edk2-089285b42c69b3e105070a3deb349eaf1c50d35b.zip | |
Revert "UefiCpuPkg/CpuDxe: Fix boot error"
This reverts commit cee5b0441af39dd6f76cc4e0447a1c7f788cbb00.
Commit cee5b0441af3 ("UefiCpuPkg/CpuDxe: Fix boot error", 2020-12-08)
breaks CpuDxe (and with it, OVMF boot) on AMD processors. AMD processors
cannot do far jumps to 64-bit targets, as documented in the AMD64
Architecture Programmer's Manual.
Revert the patch until a RETFQ-based substitute is posted.
Cc: Eric Dong <eric.dong@intel.com>
Cc: Guo Dong <guo.dong@intel.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Thomas Lendacky <thomas.lendacky@amd.com>
Ref: https://edk2.groups.io/g/devel/message/68597
Ref: https://www.redhat.com/archives/edk2-devel-archive/2020-December/msg00493.html
Reported-by: Thomas Lendacky <thomas.lendacky@amd.com>
Ref: https://edk2.groups.io/g/devel/message/68832
Ref: https://www.redhat.com/archives/edk2-devel-archive/2020-December/msg00737.html
Reported-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201217085055.15131-1-lersek@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3121
[lersek@redhat.com: add BZ link]
Diffstat (limited to 'UefiCpuPkg')
| -rw-r--r-- | UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm b/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm index 6ad32b49f4..c3489bcc3e 100644 --- a/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm +++ b/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm @@ -23,8 +23,8 @@ ASM_PFX(SetCodeSelector): sub rsp, 0x10
lea rax, [setCodeSelectorLongJump]
mov [rsp], rax
- mov [rsp+8], cx
- jmp qword far [rsp]
+ mov [rsp+4], cx
+ jmp dword far [rsp]
setCodeSelectorLongJump:
add rsp, 0x10
ret
|