[edk2-devel] [PATCH V2] UefiCpuPkg/CpuDxe: Fix boot error
Lendacky, Thomas
thomas.lendacky at amd.com
Thu Jan 7 15:01:30 UTC 2021
On 1/6/21 9:10 PM, Guo Dong via groups.io wrote:
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3084
>
> When DXE drivers are dispatched above 4GB memory in 64bit
> mode, the address setCodeSelectorLongJump in stack will
> be override by parameter. Jump to Qword is not supported
> by some processors. So use "o64 retf" instead.
>
> Signed-off-by: Guo Dong <guo.dong at intel.com>
With one little comment below, I verified this method allows my system to
boot.
Tested-by: Tom Lendacky <thomas.lendacky at amd.com>
> ---
> UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm b/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm
> index c3489bcc3e..a8216cd56f 100644
> --- a/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm
> +++ b/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm
> @@ -20,13 +20,11 @@
> ;------------------------------------------------------------------------------
> global ASM_PFX(SetCodeSelector)
> ASM_PFX(SetCodeSelector):
> - sub rsp, 0x10
> + push rcx,
Extraneous comma after rcx.
Thanks,
Tom
> lea rax, [setCodeSelectorLongJump]
> - mov [rsp], rax
> - mov [rsp+4], cx
> - jmp dword far [rsp]
> + push rax
> + o64 retf
> setCodeSelectorLongJump:
> - add rsp, 0x10
> ret
>
> ;------------------------------------------------------------------------------
>
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