diff options
Diffstat (limited to 'ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.S')
| -rw-r--r-- | ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.S | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.S b/ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.S deleted file mode 100644 index f90589c225..0000000000 --- a/ArmPkg/Library/BaseMemoryLibStm/Arm/CopyMem.S +++ /dev/null @@ -1,169 +0,0 @@ -#------------------------------------------------------------------------------
-#
-# CopyMem() worker for ARM
-#
-# This file started out as C code that did 64 bit moves if the buffer was
-# 32-bit aligned, else it does a byte copy. It also does a byte copy for
-# any trailing bytes. It was updated to do 32-byte copies using stm/ldm.
-#
-# Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
-# This program and the accompanying materials
-# are licensed and made available under the terms and conditions of the BSD License
-# which accompanies this distribution. The full text of the license may be found at
-# http://opensource.org/licenses/bsd-license.php
-#
-# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-#
-#------------------------------------------------------------------------------
-
-#include <AsmMacroIoLib.h>
-
-/**
- Copy Length bytes from Source to Destination. Overlap is OK.
-
- This implementation
-
- @param Destination Target of copy
- @param Source Place to copy from
- @param Length Number of bytes to copy
-
- @return Destination
-
-
-VOID *
-EFIAPI
-InternalMemCopyMem (
- OUT VOID *DestinationBuffer,
- IN CONST VOID *SourceBuffer,
- IN UINTN Length
- )
-**/
-ASM_FUNC(InternalMemCopyMem)
- stmfd sp!, {r4-r11, lr}
- // Save the input parameters in extra registers (r11 = destination, r14 = source, r12 = length)
- mov r11, r0
- mov r10, r0
- mov r12, r2
- mov r14, r1
-
-memcopy_check_overlapped:
- cmp r11, r1
- // If (dest < source)
- bcc memcopy_check_optim_default
- // If (dest <= source). But with the previous condition -> If (dest == source)
- bls memcopy_end
-
- // If (source + length < dest)
- rsb r3, r1, r11
- cmp r12, r3
- bcc memcopy_check_optim_default
-
- // If (length == 0)
- cmp r12, #0
- beq memcopy_end
-
- b memcopy_check_optim_overlap
-
-memcopy_check_optim_default:
- // Check if we can use an optimized path ((length >= 32) && destination word-aligned && source word-aligned) for the memcopy (optimized path if r0 == 1)
- tst r0, #0xF
- movne r0, #0
- bne memcopy_default
- tst r1, #0xF
- movne r3, #0
- moveq r3, #1
- cmp r2, #31
- movls r0, #0
- andhi r0, r3, #1
- b memcopy_default
-
-memcopy_check_optim_overlap:
- // r10 = dest_end, r14 = source_end
- add r10, r11, r12
- add r14, r12, r1
-
- // Are we in the optimized case ((length >= 32) && dest_end word-aligned && source_end word-aligned)
- cmp r2, #31
- movls r0, #0
- movhi r0, #1
- tst r10, #0xF
- movne r0, #0
- tst r14, #0xF
- movne r0, #0
- b memcopy_overlapped
-
-memcopy_overlapped_non_optim:
- // We read 1 byte from the end of the source buffer
- sub r3, r14, #1
- sub r12, r12, #1
- ldrb r3, [r3, #0]
- sub r2, r10, #1
- cmp r12, #0
- // We write 1 byte at the end of the dest buffer
- sub r10, r10, #1
- sub r14, r14, #1
- strb r3, [r2, #0]
- bne memcopy_overlapped_non_optim
- b memcopy_end
-
-// r10 = dest_end, r14 = source_end
-memcopy_overlapped:
- // Are we in the optimized case ?
- cmp r0, #0
- beq memcopy_overlapped_non_optim
-
- // Optimized Overlapped - Read 32 bytes
- sub r14, r14, #32
- sub r12, r12, #32
- cmp r12, #31
- ldmia r14, {r2-r9}
-
- // If length is less than 32 then disable optim
- movls r0, #0
-
- cmp r12, #0
-
- // Optimized Overlapped - Write 32 bytes
- sub r10, r10, #32
- stmia r10, {r2-r9}
-
- // while (length != 0)
- bne memcopy_overlapped
- b memcopy_end
-
-memcopy_default_non_optim:
- // Byte copy
- ldrb r3, [r14], #1
- sub r12, r12, #1
- strb r3, [r10], #1
-
-memcopy_default:
- cmp r12, #0
- beq memcopy_end
-
-// r10 = dest, r14 = source
-memcopy_default_loop:
- cmp r0, #0
- beq memcopy_default_non_optim
-
- // Optimized memcopy - Read 32 Bytes
- sub r12, r12, #32
- cmp r12, #31
- ldmia r14!, {r2-r9}
-
- // If length is less than 32 then disable optim
- movls r0, #0
-
- cmp r12, #0
-
- // Optimized memcopy - Write 32 Bytes
- stmia r10!, {r2-r9}
-
- // while (length != 0)
- bne memcopy_default_loop
-
-memcopy_end:
- mov r0, r11
- ldmfd sp!, {r4-r11, pc}
-
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