diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32 | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32')
12 files changed, 703 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/CompareMem.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/CompareMem.nasm new file mode 100644 index 000000000..6d56d48f6 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/CompareMem.nasm @@ -0,0 +1,51 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; CompareMem.Asm
+;
+; Abstract:
+;
+; CompareMem function
+;
+; Notes:
+;
+; The following BaseMemoryLib instances contain the same copy of this file:
+;
+; BaseMemoryLibRepStr
+; BaseMemoryLibMmx
+; BaseMemoryLibSse2
+; BaseMemoryLibOptDxe
+; BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; INTN
+; EFIAPI
+; InternalMemCompareMem (
+; IN CONST VOID *DestinationBuffer,
+; IN CONST VOID *SourceBuffer,
+; IN UINTN Length
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemCompareMem)
+ASM_PFX(InternalMemCompareMem):
+ push esi
+ push edi
+ mov esi, [esp + 12]
+ mov edi, [esp + 16]
+ mov ecx, [esp + 20]
+ repe cmpsb
+ movzx eax, byte [esi - 1]
+ movzx edx, byte [edi - 1]
+ sub eax, edx
+ pop edi
+ pop esi
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.nasm new file mode 100644 index 000000000..0aa371a47 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.nasm @@ -0,0 +1,78 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; CopyMem.nasm
+;
+; Abstract:
+;
+; CopyMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; InternalMemCopyMem (
+; IN VOID *Destination,
+; IN VOID *Source,
+; IN UINTN Count
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemCopyMem)
+ASM_PFX(InternalMemCopyMem):
+ push esi
+ push edi
+ mov esi, [esp + 16] ; esi <- Source
+ mov edi, [esp + 12] ; edi <- Destination
+ mov edx, [esp + 20] ; edx <- Count
+ lea eax, [esi + edx - 1] ; eax <- End of Source
+ cmp esi, edi
+ jae .0
+ cmp eax, edi ; Overlapped?
+ jae @CopyBackward ; Copy backward if overlapped
+.0:
+ xor ecx, ecx
+ sub ecx, edi
+ and ecx, 15 ; ecx + edi aligns on 16-byte boundary
+ jz .1
+ cmp ecx, edx
+ cmova ecx, edx
+ sub edx, ecx ; edx <- remaining bytes to copy
+ rep movsb
+.1:
+ mov ecx, edx
+ and edx, 15
+ shr ecx, 4 ; ecx <- # of DQwords to copy
+ jz @CopyBytes
+ add esp, -16
+ movdqu [esp], xmm0 ; save xmm0
+.2:
+ movdqu xmm0, [esi] ; esi may not be 16-bytes aligned
+ movntdq [edi], xmm0 ; edi should be 16-bytes aligned
+ add esi, 16
+ add edi, 16
+ loop .2
+ mfence
+ movdqu xmm0, [esp] ; restore xmm0
+ add esp, 16 ; stack cleanup
+ jmp @CopyBytes
+@CopyBackward:
+ mov esi, eax ; esi <- Last byte in Source
+ lea edi, [edi + edx - 1] ; edi <- Last byte in Destination
+ std
+@CopyBytes:
+ mov ecx, edx
+ rep movsb
+ cld
+ mov eax, [esp + 12] ; eax <- Destination as return value
+ pop edi
+ pop esi
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/IsZeroBuffer.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/IsZeroBuffer.nasm new file mode 100644 index 000000000..c3bfb7110 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/IsZeroBuffer.nasm @@ -0,0 +1,68 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; IsZeroBuffer.nasm
+;
+; Abstract:
+;
+; IsZeroBuffer function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; BOOLEAN
+; EFIAPI
+; InternalMemIsZeroBuffer (
+; IN CONST VOID *Buffer,
+; IN UINTN Length
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemIsZeroBuffer)
+ASM_PFX(InternalMemIsZeroBuffer):
+ push edi
+ mov edi, [esp + 8] ; edi <- Buffer
+ mov edx, [esp + 12] ; edx <- Length
+ xor ecx, ecx ; ecx <- 0
+ sub ecx, edi
+ and ecx, 15 ; ecx + edi aligns on 16-byte boundary
+ jz @Is16BytesZero
+ cmp ecx, edx
+ cmova ecx, edx ; bytes before the 16-byte boundary
+ sub edx, ecx
+ xor eax, eax ; eax <- 0, also set ZF
+ repe scasb
+ jnz @ReturnFalse ; ZF=0 means non-zero element found
+@Is16BytesZero:
+ mov ecx, edx
+ and edx, 15
+ shr ecx, 4
+ jz @IsBytesZero
+.0:
+ pxor xmm0, xmm0 ; xmm0 <- 0
+ pcmpeqb xmm0, [edi] ; check zero for 16 bytes
+ pmovmskb eax, xmm0 ; eax <- compare results
+ cmp eax, 0xffff
+ jnz @ReturnFalse
+ add edi, 16
+ loop .0
+@IsBytesZero:
+ mov ecx, edx
+ xor eax, eax ; eax <- 0, also set ZF
+ repe scasb
+ jnz @ReturnFalse ; ZF=0 means non-zero element found
+ pop edi
+ mov eax, 1 ; return TRUE
+ ret
+@ReturnFalse:
+ pop edi
+ xor eax, eax
+ ret ; return FALSE
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem16.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem16.nasm new file mode 100644 index 000000000..7a3332b53 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem16.nasm @@ -0,0 +1,48 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; ScanMem16.Asm
+;
+; Abstract:
+;
+; ScanMem16 function
+;
+; Notes:
+;
+; The following BaseMemoryLib instances contain the same copy of this file:
+;
+; BaseMemoryLibRepStr
+; BaseMemoryLibMmx
+; BaseMemoryLibSse2
+; BaseMemoryLibOptDxe
+; BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; CONST VOID *
+; EFIAPI
+; InternalMemScanMem16 (
+; IN CONST VOID *Buffer,
+; IN UINTN Length,
+; IN UINT16 Value
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemScanMem16)
+ASM_PFX(InternalMemScanMem16):
+ push edi
+ mov ecx, [esp + 12]
+ mov edi, [esp + 8]
+ mov eax, [esp + 16]
+ repne scasw
+ lea eax, [edi - 2]
+ cmovnz eax, ecx
+ pop edi
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem32.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem32.nasm new file mode 100644 index 000000000..9d602f0f4 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem32.nasm @@ -0,0 +1,48 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; ScanMem32.Asm
+;
+; Abstract:
+;
+; ScanMem32 function
+;
+; Notes:
+;
+; The following BaseMemoryLib instances contain the same copy of this file:
+;
+; BaseMemoryLibRepStr
+; BaseMemoryLibMmx
+; BaseMemoryLibSse2
+; BaseMemoryLibOptDxe
+; BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; CONST VOID *
+; EFIAPI
+; InternalMemScanMem32 (
+; IN CONST VOID *Buffer,
+; IN UINTN Length,
+; IN UINT32 Value
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemScanMem32)
+ASM_PFX(InternalMemScanMem32):
+ push edi
+ mov ecx, [esp + 12]
+ mov edi, [esp + 8]
+ mov eax, [esp + 16]
+ repne scasd
+ lea eax, [edi - 4]
+ cmovnz eax, ecx
+ pop edi
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem64.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem64.nasm new file mode 100644 index 000000000..674bcf03e --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem64.nasm @@ -0,0 +1,57 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; ScanMem64.Asm
+;
+; Abstract:
+;
+; ScanMem64 function
+;
+; Notes:
+;
+; The following BaseMemoryLib instances contain the same copy of this file:
+;
+; BaseMemoryLibRepStr
+; BaseMemoryLibMmx
+; BaseMemoryLibSse2
+; BaseMemoryLibOptDxe
+; BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; CONST VOID *
+; EFIAPI
+; InternalMemScanMem64 (
+; IN CONST VOID *Buffer,
+; IN UINTN Length,
+; IN UINT64 Value
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemScanMem64)
+ASM_PFX(InternalMemScanMem64):
+ push edi
+ mov ecx, [esp + 12]
+ mov eax, [esp + 16]
+ mov edx, [esp + 20]
+ mov edi, [esp + 8]
+.0:
+ cmp eax, [edi]
+ lea edi, [edi + 8]
+ loopne .0
+ jne .1
+ cmp edx, [edi - 4]
+ jecxz .1
+ jne .0
+.1:
+ lea eax, [edi - 8]
+ cmovne eax, ecx
+ pop edi
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem8.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem8.nasm new file mode 100644 index 000000000..9244e559b --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ScanMem8.nasm @@ -0,0 +1,48 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; ScanMem8.Asm
+;
+; Abstract:
+;
+; ScanMem8 function
+;
+; Notes:
+;
+; The following BaseMemoryLib instances contain the same copy of this file:
+;
+; BaseMemoryLibRepStr
+; BaseMemoryLibMmx
+; BaseMemoryLibSse2
+; BaseMemoryLibOptDxe
+; BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; CONST VOID *
+; EFIAPI
+; InternalMemScanMem8 (
+; IN CONST VOID *Buffer,
+; IN UINTN Length,
+; IN UINT8 Value
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemScanMem8)
+ASM_PFX(InternalMemScanMem8):
+ push edi
+ mov ecx, [esp + 12]
+ mov edi, [esp + 8]
+ mov al, [esp + 16]
+ repne scasb
+ lea eax, [edi - 1]
+ cmovnz eax, ecx
+ pop edi
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem.nasm new file mode 100644 index 000000000..24313cb4b --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem.nasm @@ -0,0 +1,67 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; SetMem.nasm
+;
+; Abstract:
+;
+; SetMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemSetMem (
+; IN VOID *Buffer,
+; IN UINTN Count,
+; IN UINT8 Value
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemSetMem)
+ASM_PFX(InternalMemSetMem):
+ push edi
+ mov edx, [esp + 12] ; edx <- Count
+ mov edi, [esp + 8] ; edi <- Buffer
+ mov al, [esp + 16] ; al <- Value
+ xor ecx, ecx
+ sub ecx, edi
+ and ecx, 15 ; ecx + edi aligns on 16-byte boundary
+ jz .0
+ cmp ecx, edx
+ cmova ecx, edx
+ sub edx, ecx
+ rep stosb
+.0:
+ mov ecx, edx
+ and edx, 15
+ shr ecx, 4 ; ecx <- # of DQwords to set
+ jz @SetBytes
+ mov ah, al ; ax <- Value | (Value << 8)
+ add esp, -16
+ movdqu [esp], xmm0 ; save xmm0
+ movd xmm0, eax
+ pshuflw xmm0, xmm0, 0 ; xmm0[0..63] <- Value repeats 8 times
+ movlhps xmm0, xmm0 ; xmm0 <- Value repeats 16 times
+.1:
+ movntdq [edi], xmm0 ; edi should be 16-byte aligned
+ add edi, 16
+ loop .1
+ mfence
+ movdqu xmm0, [esp] ; restore xmm0
+ add esp, 16 ; stack cleanup
+@SetBytes:
+ mov ecx, edx
+ rep stosb
+ mov eax, [esp + 8] ; eax <- Buffer as return value
+ pop edi
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem16.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem16.nasm new file mode 100644 index 000000000..6e308b559 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem16.nasm @@ -0,0 +1,63 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; SetMem16.nasm
+;
+; Abstract:
+;
+; SetMem16 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemSetMem16 (
+; IN VOID *Buffer,
+; IN UINTN Count,
+; IN UINT16 Value
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemSetMem16)
+ASM_PFX(InternalMemSetMem16):
+ push edi
+ mov edx, [esp + 12]
+ mov edi, [esp + 8]
+ xor ecx, ecx
+ sub ecx, edi
+ and ecx, 15 ; ecx + edi aligns on 16-byte boundary
+ mov eax, [esp + 16]
+ jz .0
+ shr ecx, 1
+ cmp ecx, edx
+ cmova ecx, edx
+ sub edx, ecx
+ rep stosw
+.0:
+ mov ecx, edx
+ and edx, 7
+ shr ecx, 3
+ jz @SetWords
+ movd xmm0, eax
+ pshuflw xmm0, xmm0, 0
+ movlhps xmm0, xmm0
+.1:
+ movntdq [edi], xmm0 ; edi should be 16-byte aligned
+ add edi, 16
+ loop .1
+ mfence
+@SetWords:
+ mov ecx, edx
+ rep stosw
+ mov eax, [esp + 8]
+ pop edi
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem32.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem32.nasm new file mode 100644 index 000000000..2cfc8cb0d --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem32.nasm @@ -0,0 +1,62 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; SetMem32.nasm
+;
+; Abstract:
+;
+; SetMem32 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemSetMem32 (
+; IN VOID *Buffer,
+; IN UINTN Count,
+; IN UINT32 Value
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemSetMem32)
+ASM_PFX(InternalMemSetMem32):
+ push edi
+ mov edx, [esp + 12]
+ mov edi, [esp + 8]
+ xor ecx, ecx
+ sub ecx, edi
+ and ecx, 15 ; ecx + edi aligns on 16-byte boundary
+ mov eax, [esp + 16]
+ jz .0
+ shr ecx, 2
+ cmp ecx, edx
+ cmova ecx, edx
+ sub edx, ecx
+ rep stosd
+.0:
+ mov ecx, edx
+ and edx, 3
+ shr ecx, 2
+ jz @SetDwords
+ movd xmm0, eax
+ pshufd xmm0, xmm0, 0
+.1:
+ movntdq [edi], xmm0
+ add edi, 16
+ loop .1
+ mfence
+@SetDwords:
+ mov ecx, edx
+ rep stosd
+ mov eax, [esp + 8]
+ pop edi
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem64.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem64.nasm new file mode 100644 index 000000000..e153495a6 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem64.nasm @@ -0,0 +1,54 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; SetMem64.nasm
+;
+; Abstract:
+;
+; SetMem64 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemSetMem64 (
+; IN VOID *Buffer,
+; IN UINTN Count,
+; IN UINT64 Value
+; )
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemSetMem64)
+ASM_PFX(InternalMemSetMem64):
+ mov eax, [esp + 4] ; eax <- Buffer
+ mov ecx, [esp + 8] ; ecx <- Count
+ test al, 8
+ mov edx, eax
+ movq xmm0, qword [esp + 12]
+ jz .0
+ movq qword [edx], xmm0
+ add edx, 8
+ dec ecx
+.0:
+ shr ecx, 1
+ jz @SetQwords
+ movlhps xmm0, xmm0
+.1:
+ movntdq [edx], xmm0
+ lea edx, [edx + 16]
+ loop .1
+ mfence
+@SetQwords:
+ jnc .2
+ movq qword [edx], xmm0
+.2:
+ ret
+
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.nasm new file mode 100644 index 000000000..cd34006f5 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibSse2/Ia32/ZeroMem.nasm @@ -0,0 +1,59 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; ZeroMem.nasm
+;
+; Abstract:
+;
+; ZeroMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemZeroMem (
+; IN VOID *Buffer,
+; IN UINTN Count
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemZeroMem)
+ASM_PFX(InternalMemZeroMem):
+ push edi
+ mov edi, [esp + 8]
+ mov edx, [esp + 12]
+ xor ecx, ecx
+ sub ecx, edi
+ xor eax, eax
+ and ecx, 15
+ jz .0
+ cmp ecx, edx
+ cmova ecx, edx
+ sub edx, ecx
+ rep stosb
+.0:
+ mov ecx, edx
+ and edx, 15
+ shr ecx, 4
+ jz @ZeroBytes
+ pxor xmm0, xmm0
+.1:
+ movntdq [edi], xmm0
+ add edi, 16
+ loop .1
+ mfence
+@ZeroBytes:
+ mov ecx, edx
+ rep stosb
+ mov eax, [esp + 8]
+ pop edi
+ ret
+
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