diff options
Diffstat (limited to 'OvmfPkg/IntelTdx/Sec/X64/IntelTdxAPs.nasm')
-rw-r--r-- | OvmfPkg/IntelTdx/Sec/X64/IntelTdxAPs.nasm | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/OvmfPkg/IntelTdx/Sec/X64/IntelTdxAPs.nasm b/OvmfPkg/IntelTdx/Sec/X64/IntelTdxAPs.nasm new file mode 100644 index 0000000000..034ac0ee94 --- /dev/null +++ b/OvmfPkg/IntelTdx/Sec/X64/IntelTdxAPs.nasm @@ -0,0 +1,58 @@ +;------------------------------------------------------------------------------
+; @file
+; Intel TDX APs
+;
+; Copyright (c) 2021 - 2022, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+;------------------------------------------------------------------------------
+
+%include "TdxCommondefs.inc"
+
+ ;
+ ; Note: BSP never gets here. APs will be unblocked by DXE
+ ;
+ ; R8 [31:0] NUM_VCPUS
+ ; [63:32] MAX_VCPUS
+ ; R9 [31:0] VCPU_INDEX
+ ;
+ParkAp:
+
+do_wait_loop:
+ ;
+ ; register itself in [rsp + CpuArrivalOffset]
+ ;
+ mov rax, 1
+ lock xadd dword [rsp + CpuArrivalOffset], eax
+ inc eax
+
+.check_arrival_cnt:
+ cmp eax, r8d
+ je .check_command
+ mov eax, dword[rsp + CpuArrivalOffset]
+ jmp .check_arrival_cnt
+
+.check_command:
+ mov eax, dword[rsp + CommandOffset]
+ cmp eax, MpProtectedModeWakeupCommandNoop
+ je .check_command
+
+ cmp eax, MpProtectedModeWakeupCommandWakeup
+ je .do_wakeup
+
+ ; Don't support this command, so ignore
+ jmp .check_command
+
+.do_wakeup:
+ ;
+ ; BSP sets these variables before unblocking APs
+ ; RAX: WakeupVectorOffset
+ ; RBX: Relocated mailbox address
+ ; RBP: vCpuId
+ ;
+ mov rax, 0
+ mov eax, dword[rsp + WakeupVectorOffset]
+ mov rbx, [rsp + WakeupArgsRelocatedMailBox]
+ nop
+ jmp rax
+ jmp $
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