1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * ARCv2 memcpy implementation optimized for unaligned memory access using. 4 * 5 * Copyright (C) 2019 Synopsys 6 * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> 7 */ 8 9 #include <linux/linkage.h> 10 11 #ifdef CONFIG_ARC_HAS_LL64 12 # define LOADX(DST,RX) ldd.ab DST, [RX, 8] 13 # define STOREX(SRC,RX) std.ab SRC, [RX, 8] 14 # define ZOLSHFT 5 15 # define ZOLAND 0x1F 16 #else 17 # define LOADX(DST,RX) ld.ab DST, [RX, 4] 18 # define STOREX(SRC,RX) st.ab SRC, [RX, 4] 19 # define ZOLSHFT 4 20 # define ZOLAND 0xF 21 #endif 22 23 ENTRY_CFI(memcpy) 24 mov r3, r0 ; don;t clobber ret val 25 26 lsr.f lp_count, r2, ZOLSHFT 27 lpnz @.Lcopy32_64bytes 28 ;; LOOP START 29 LOADX (r6, r1) 30 LOADX (r8, r1) 31 LOADX (r10, r1) 32 LOADX (r4, r1) 33 STOREX (r6, r3) 34 STOREX (r8, r3) 35 STOREX (r10, r3) 36 STOREX (r4, r3) 37 .Lcopy32_64bytes: 38 39 and.f lp_count, r2, ZOLAND ;Last remaining 31 bytes 40 lpnz @.Lcopyremainingbytes 41 ;; LOOP START 42 ldb.ab r5, [r1, 1] 43 stb.ab r5, [r3, 1] 44 .Lcopyremainingbytes: 45 46 j [blink] 47 END_CFI(memcpy) 48