| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| 2 | /* |
| 3 | * This file is subject to the terms and conditions of the GNU General Public |
| 4 | * License. See the file "COPYING" in the main directory of this archive |
| 5 | * for more details. |
| 6 | * |
| 7 | * Copyright (C) 1996, 99, 2003 by Ralf Baechle |
| 8 | */ |
| 9 | #ifndef _ASM_SWAB_H |
| 10 | #define _ASM_SWAB_H |
| 11 | |
| 12 | #include <linux/compiler.h> |
| 13 | #include <linux/types.h> |
| 14 | |
| 15 | #define __SWAB_64_THRU_32__ |
| 16 | |
| 17 | #if !defined(__mips16) && \ |
| 18 | ((defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) || \ |
| 19 | defined(_MIPS_ARCH_LOONGSON3A)) |
| 20 | |
| 21 | static inline __attribute_const__ __u16 __arch_swab16(__u16 x) |
| 22 | { |
| 23 | __asm__( |
| 24 | " .set push \n" |
| 25 | " .set arch=mips32r2 \n" |
| 26 | " wsbh %0, %1 \n" |
| 27 | " .set pop \n" |
| 28 | : "=r" (x) |
| 29 | : "r" (x)); |
| 30 | |
| 31 | return x; |
| 32 | } |
| 33 | #define __arch_swab16 __arch_swab16 |
| 34 | |
| 35 | static inline __attribute_const__ __u32 __arch_swab32(__u32 x) |
| 36 | { |
| 37 | __asm__( |
| 38 | " .set push \n" |
| 39 | " .set arch=mips32r2 \n" |
| 40 | " wsbh %0, %1 \n" |
| 41 | " rotr %0, %0, 16 \n" |
| 42 | " .set pop \n" |
| 43 | : "=r" (x) |
| 44 | : "r" (x)); |
| 45 | |
| 46 | return x; |
| 47 | } |
| 48 | #define __arch_swab32 __arch_swab32 |
| 49 | |
| 50 | /* |
| 51 | * Having already checked for MIPS R2, enable the optimized version for |
| 52 | * 64-bit kernel on r2 CPUs. |
| 53 | */ |
| 54 | #ifdef __mips64 |
| 55 | static inline __attribute_const__ __u64 __arch_swab64(__u64 x) |
| 56 | { |
| 57 | __asm__( |
| 58 | " .set push \n" |
| 59 | " .set arch=mips64r2 \n" |
| 60 | " dsbh %0, %1 \n" |
| 61 | " dshd %0, %0 \n" |
| 62 | " .set pop \n" |
| 63 | : "=r" (x) |
| 64 | : "r" (x)); |
| 65 | |
| 66 | return x; |
| 67 | } |
| 68 | #define __arch_swab64 __arch_swab64 |
| 69 | #endif /* __mips64 */ |
| 70 | #endif /* (not __mips16) and (MIPS R2 or newer or Loongson 3A) */ |
| 71 | #endif /* _ASM_SWAB_H */ |