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;------------------------------------------------------------------------------
;*
;* Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
;* SPDX-License-Identifier: BSD-2-Clause-Patent
;*
;* CpuAsm.asm
;*
;* Abstract:
;*
;------------------------------------------------------------------------------
#include <Base.h>
DEFAULT REL
SECTION .text
extern ASM_PFX(SecCoreStartupWithStack)
%macro tdcall 0
db 0x66, 0x0f, 0x01, 0xcc
%endmacro
;
; SecCore Entry Point
;
; Processor is in flat protected mode
;
; @param[in] RAX Initial value of the EAX register (BIST: Built-in Self Test)
; @param[in] DI 'BP': boot-strap processor, or 'AP': application processor
; @param[in] RBP Pointer to the start of the Boot Firmware Volume
; @param[in] DS Selector allowing flat access to all addresses
; @param[in] ES Selector allowing flat access to all addresses
; @param[in] FS Selector allowing flat access to all addresses
; @param[in] GS Selector allowing flat access to all addresses
; @param[in] SS Selector allowing flat access to all addresses
;
; @return None This routine does not return
;
global ASM_PFX(_ModuleEntryPoint)
ASM_PFX(_ModuleEntryPoint):
;
; Guest type is stored in OVMF_WORK_AREA
;
%define OVMF_WORK_AREA FixedPcdGet32 (PcdOvmfWorkAreaBase)
%define VM_GUEST_TYPE_TDX 2
mov eax, OVMF_WORK_AREA
cmp byte[eax], VM_GUEST_TYPE_TDX
jne InitStack
%define TDCALL_TDINFO 1
mov rax, TDCALL_TDINFO
tdcall
;
; R8 [31:0] NUM_VCPUS
; [63:32] MAX_VCPUS
; R9 [31:0] VCPU_INDEX
; Td Guest set the VCPU0 as the BSP, others are the APs
; APs jump to spinloop and get released by DXE's MpInitLib
;
mov rax, r9
and rax, 0xffff
test rax, rax
jz InitStack
mov rsp, FixedPcdGet32 (PcdOvmfSecGhcbBackupBase)
jmp ParkAp
InitStack:
;
; Fill the temporary RAM with the initial stack value.
; The loop below will seed the heap as well, but that's harmless.
;
mov rax, (FixedPcdGet32 (PcdInitValueInTempStack) << 32) | FixedPcdGet32 (PcdInitValueInTempStack)
; qword to store
mov rdi, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) ; base address,
; relative to
; ES
mov rcx, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize) / 8 ; qword count
cld ; store from base
; up
rep stosq
;
; Load temporary RAM stack based on PCDs
;
%define SEC_TOP_OF_STACK (FixedPcdGet32 (PcdOvmfSecPeiTempRamBase) + \
FixedPcdGet32 (PcdOvmfSecPeiTempRamSize))
mov rsp, SEC_TOP_OF_STACK
nop
;
; Setup parameters and call SecCoreStartupWithStack
; rcx: BootFirmwareVolumePtr
; rdx: TopOfCurrentStack
;
mov rcx, rbp
mov rdx, rsp
sub rsp, 0x20
call ASM_PFX(SecCoreStartupWithStack)
%include "IntelTdxAPs.nasm"
|
