mirror of https://github.com/acidanthera/audk.git
95 lines
2.1 KiB
NASM
95 lines
2.1 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (C) 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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; Module Name:
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;
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; VmgExitSvsm.Asm
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;
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; Abstract:
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;
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; AsmVmgExitSvsm function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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DEFAULT REL
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SECTION .text
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;------------------------------------------------------------------------------
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; typedef struct {
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; VOID *Caa;
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; UINT64 RaxIn;
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; UINT64 RcxIn;
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; UINT64 RdxIn;
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; UINT64 R8In;
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; UINT64 R9In;
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; UINT64 RaxOut;
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; UINT64 RcxOut;
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; UINT64 RdxOut;
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; UINT64 R8Out;
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; UINT64 R9Out;
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; UINT8 *CallPending;
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; } SVSM_CALL_DATA;
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;
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; UINT32
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; EFIAPI
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; AsmVmgExitSvsm (
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; SVSM_CALL_DATA *SvsmCallData
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(AsmVmgExitSvsm)
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ASM_PFX(AsmVmgExitSvsm):
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push r10
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push r11
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push r12
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;
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; Calling convention has SvsmCallData in RCX. Move RCX to R12 in order to
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; properly populate the SVSM register state.
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;
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mov r12, rcx
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mov rax, [r12 + 8]
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mov rcx, [r12 + 16]
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mov rdx, [r12 + 24]
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mov r8, [r12 + 32]
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mov r9, [r12 + 40]
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;
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; Set CA call pending
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;
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mov r10, [r12]
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mov byte [r10], 1
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rep vmmcall
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mov [r12 + 48], rax
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mov [r12 + 56], rcx
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mov [r12 + 64], rdx
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mov [r12 + 72], r8
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mov [r12 + 80], r9
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;
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; Perform the atomic exchange and return the CA call pending value.
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; The call pending value is a one-byte field at offset 0 into the CA,
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; which is currently the value in R10.
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;
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mov r11, [r12 + 88] ; Get CallPending address
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mov cl, byte [r11]
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xchg byte [r10], cl
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mov byte [r11], cl ; Return the exchanged value
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pop r12
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pop r11
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pop r10
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;
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; RAX has the value to be returned from the SVSM
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;
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ret
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