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