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https://github.com/CloverHackyColor/CloverBootloader.git
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69 lines
2.1 KiB
NASM
69 lines
2.1 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, 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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; Module Name:
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;
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; CopyMem.nasm
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;
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; Abstract:
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;
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; CopyMem 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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; VOID *
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; EFIAPI
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; InternalMemCopyMem (
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; OUT VOID *DestinationBuffer,
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; IN CONST VOID *SourceBuffer,
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; IN UINTN Length
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalMemCopyMem)
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ASM_PFX(InternalMemCopyMem):
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push rsi
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push rdi
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mov rsi, rdx ; rsi <- Source
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mov rdi, rcx ; rdi <- Destination
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lea r9, [rsi + r8 - 1] ; r9 <- End of Source
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cmp rsi, rdi
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mov rax, rdi ; rax <- Destination as return value
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jae .0
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cmp r9, rdi
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jae @CopyBackward ; Copy backward if overlapped
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.0:
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mov rcx, r8
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and r8, 7
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shr rcx, 3 ; rcx <- # of Qwords to copy
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jz @CopyBytes
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DB 0x49, 0xf, 0x7e, 0xc2 ; movd r10, mm0 (Save mm0 in r10)
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.1:
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DB 0xf, 0x6f, 0x6 ; movd mm0, [rsi]
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DB 0xf, 0xe7, 0x7 ; movntq [rdi], mm0
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add rsi, 8
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add rdi, 8
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loop .1
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mfence
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DB 0x49, 0xf, 0x6e, 0xc2 ; movd mm0, r10 (Restore mm0)
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jmp @CopyBytes
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@CopyBackward:
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mov rsi, r9 ; rsi <- End of Source
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lea rdi, [rdi + r8 - 1] ; rdi <- End of Destination
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std ; set direction flag
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@CopyBytes:
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mov rcx, r8
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rep movsb ; Copy bytes backward
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cld
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pop rdi
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pop rsi
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ret
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