1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (C) 2023 Rivos Inc. */ 3 4 #include <linux/linkage.h> 5 #include <asm/asm.h> 6 7 .text 8 9 /* void __riscv_copy_words_unaligned(void *, const void *, size_t) */ 10 /* Performs a memcpy without aligning buffers, using word loads and stores. */ 11 /* Note: The size is truncated to a multiple of 8 * SZREG */ 12 ENTRY(__riscv_copy_words_unaligned) 13 andi a4, a2, ~((8*SZREG)-1) 14 beqz a4, 2f 15 add a3, a1, a4 16 1: 17 REG_L a4, 0(a1) 18 REG_L a5, SZREG(a1) 19 REG_L a6, 2*SZREG(a1) 20 REG_L a7, 3*SZREG(a1) 21 REG_L t0, 4*SZREG(a1) 22 REG_L t1, 5*SZREG(a1) 23 REG_L t2, 6*SZREG(a1) 24 REG_L t3, 7*SZREG(a1) 25 REG_S a4, 0(a0) 26 REG_S a5, SZREG(a0) 27 REG_S a6, 2*SZREG(a0) 28 REG_S a7, 3*SZREG(a0) 29 REG_S t0, 4*SZREG(a0) 30 REG_S t1, 5*SZREG(a0) 31 REG_S t2, 6*SZREG(a0) 32 REG_S t3, 7*SZREG(a0) 33 addi a0, a0, 8*SZREG 34 addi a1, a1, 8*SZREG 35 bltu a1, a3, 1b 36 37 2: 38 ret 39 END(__riscv_copy_words_unaligned) 40 41 /* void __riscv_copy_bytes_unaligned(void *, const void *, size_t) */ 42 /* Performs a memcpy without aligning buffers, using only byte accesses. */ 43 /* Note: The size is truncated to a multiple of 8 */ 44 ENTRY(__riscv_copy_bytes_unaligned) 45 andi a4, a2, ~(8-1) 46 beqz a4, 2f 47 add a3, a1, a4 48 1: 49 lb a4, 0(a1) 50 lb a5, 1(a1) 51 lb a6, 2(a1) 52 lb a7, 3(a1) 53 lb t0, 4(a1) 54 lb t1, 5(a1) 55 lb t2, 6(a1) 56 lb t3, 7(a1) 57 sb a4, 0(a0) 58 sb a5, 1(a0) 59 sb a6, 2(a0) 60 sb a7, 3(a0) 61 sb t0, 4(a0) 62 sb t1, 5(a0) 63 sb t2, 6(a0) 64 sb t3, 7(a0) 65 addi a0, a0, 8 66 addi a1, a1, 8 67 bltu a1, a3, 1b 68 69 2: 70 ret 71 END(__riscv_copy_bytes_unaligned) 72