projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3402aac7 | 1 | #------------------------------------------------------------------------------\r |
| d39eb83c | 2 | #\r |
| 3 | # CopyMem() worker for ARM\r | |
| 4 | #\r | |
| 5 | # This file started out as C code that did 64 bit moves if the buffer was\r | |
| 6 | # 32-bit aligned, else it does a byte copy. It also does a byte copy for\r | |
| 7 | # any trailing bytes. Update using VSTM/SLDM to do 128 byte copies.\r | |
| 8 | #\r | |
| d6ebcab7 HT |
9 | # Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r |
| 10 | # This program and the accompanying materials\r | |
| d39eb83c | 11 | # are licensed and made available under the terms and conditions of the BSD License\r |
| 12 | # which accompanies this distribution. The full text of the license may be found at\r | |
| 13 | # http://opensource.org/licenses/bsd-license.php\r | |
| 14 | #\r | |
| 15 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 16 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 17 | #\r | |
| 18 | #------------------------------------------------------------------------------\r | |
| 19 | \r | |
| 7589d9db AB |
20 | #include <AsmMacroIoLib.h>\r |
| 21 | \r | |
| d39eb83c | 22 | /**\r |
| 23 | Copy Length bytes from Source to Destination. Overlap is OK.\r | |
| 24 | \r | |
| 3402aac7 | 25 | This implementation\r |
| d39eb83c | 26 | \r |
| 27 | @param Destination Target of copy\r | |
| 28 | @param Source Place to copy from\r | |
| 29 | @param Length Number of bytes to copy\r | |
| 30 | \r | |
| 31 | @return Destination\r | |
| 32 | \r | |
| 33 | \r | |
| 34 | VOID *\r | |
| 35 | EFIAPI\r | |
| 36 | InternalMemCopyMem (\r | |
| 37 | OUT VOID *DestinationBuffer,\r | |
| 38 | IN CONST VOID *SourceBuffer,\r | |
| 39 | IN UINTN Length\r | |
| 40 | )\r | |
| 41 | **/\r | |
| 7589d9db | 42 | ASM_FUNC(InternalMemCopyMem)\r |
| 2ac288f9 | 43 | stmfd sp!, {r4, r9, lr}\r |
| 44 | tst r0, #3\r | |
| 45 | mov r4, r0\r | |
| 46 | mov r9, r0\r | |
| 47 | mov ip, r2\r | |
| 48 | mov lr, r1\r | |
| 49 | movne r0, #0\r | |
| 50 | bne L4\r | |
| 51 | tst r1, #3\r | |
| 52 | movne r3, #0\r | |
| 53 | moveq r3, #1\r | |
| 54 | cmp r2, #127\r | |
| 55 | movls r0, #0\r | |
| 56 | andhi r0, r3, #1\r | |
| d39eb83c | 57 | L4:\r |
| 2ac288f9 | 58 | cmp r4, r1\r |
| 59 | bcc L26\r | |
| 60 | bls L7\r | |
| 61 | rsb r3, r1, r4\r | |
| 62 | cmp ip, r3\r | |
| 63 | bcc L26\r | |
| 64 | cmp ip, #0\r | |
| 65 | beq L7\r | |
| 66 | add r9, r4, ip\r | |
| 67 | add lr, ip, r1\r | |
| 68 | b L16\r | |
| d39eb83c | 69 | L29:\r |
| 2ac288f9 | 70 | sub ip, ip, #8\r |
| 71 | cmp ip, #7\r | |
| 72 | ldrd r2, [lr, #-8]!\r | |
| 73 | movls r0, #0\r | |
| 74 | cmp ip, #0\r | |
| 75 | strd r2, [r9, #-8]!\r | |
| 76 | beq L7\r | |
| d39eb83c | 77 | L16:\r |
| 2ac288f9 | 78 | cmp r0, #0\r |
| 79 | bne L29\r | |
| 80 | sub r3, lr, #1\r | |
| 81 | sub ip, ip, #1\r | |
| 3402aac7 | 82 | ldrb r3, [r3, #0]\r |
| 2ac288f9 | 83 | sub r2, r9, #1\r |
| 84 | cmp ip, #0\r | |
| 85 | sub r9, r9, #1\r | |
| 86 | sub lr, lr, #1\r | |
| 87 | strb r3, [r2, #0]\r | |
| 88 | bne L16\r | |
| 89 | b L7\r | |
| d39eb83c | 90 | L11:\r |
| 3402aac7 | 91 | ldrb r3, [lr], #1\r |
| 2ac288f9 | 92 | sub ip, ip, #1\r |
| 93 | strb r3, [r9], #1\r | |
| d39eb83c | 94 | L26:\r |
| 2ac288f9 | 95 | cmp ip, #0\r |
| 96 | beq L7\r | |
| d39eb83c | 97 | L30:\r |
| 2ac288f9 | 98 | cmp r0, #0\r |
| 99 | beq L11\r | |
| 100 | sub ip, ip, #128 // 32\r | |
| 101 | cmp ip, #127 // 31\r | |
| 102 | vldm lr!, {d0-d15}\r | |
| 103 | movls r0, #0\r | |
| 104 | cmp ip, #0\r | |
| 105 | vstm r9!, {d0-d15}\r | |
| 106 | bne L30\r | |
| d39eb83c | 107 | L7:\r |
| 108 | dsb\r | |
| 2ac288f9 | 109 | mov r0, r4\r |
| 110 | ldmfd sp!, {r4, r9, pc}\r | |
| d39eb83c | 111 | \r |
| 3402aac7 | 112 | \r |