1*6f52b16cSGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 296433f6eSDavid Howells #ifndef _ALPHA_SWAB_H 396433f6eSDavid Howells #define _ALPHA_SWAB_H 496433f6eSDavid Howells 596433f6eSDavid Howells #include <linux/types.h> 696433f6eSDavid Howells #include <linux/compiler.h> 796433f6eSDavid Howells #include <asm/compiler.h> 896433f6eSDavid Howells 996433f6eSDavid Howells #ifdef __GNUC__ 1096433f6eSDavid Howells 1196433f6eSDavid Howells static inline __attribute_const__ __u32 __arch_swab32(__u32 x) 1296433f6eSDavid Howells { 1396433f6eSDavid Howells /* 1496433f6eSDavid Howells * Unfortunately, we can't use the 6 instruction sequence 1596433f6eSDavid Howells * on ev6 since the latency of the UNPKBW is 3, which is 1696433f6eSDavid Howells * pretty hard to hide. Just in case a future implementation 1796433f6eSDavid Howells * has a lower latency, here's the sequence (also by Mike Burrows) 1896433f6eSDavid Howells * 1996433f6eSDavid Howells * UNPKBW a0, v0 v0: 00AA00BB00CC00DD 2096433f6eSDavid Howells * SLL v0, 24, a0 a0: BB00CC00DD000000 2196433f6eSDavid Howells * BIS v0, a0, a0 a0: BBAACCBBDDCC00DD 2296433f6eSDavid Howells * EXTWL a0, 6, v0 v0: 000000000000BBAA 2396433f6eSDavid Howells * ZAP a0, 0xf3, a0 a0: 00000000DDCC0000 2496433f6eSDavid Howells * ADDL a0, v0, v0 v0: ssssssssDDCCBBAA 2596433f6eSDavid Howells */ 2696433f6eSDavid Howells 2796433f6eSDavid Howells __u64 t0, t1, t2, t3; 2896433f6eSDavid Howells 2996433f6eSDavid Howells t0 = __kernel_inslh(x, 7); /* t0 : 0000000000AABBCC */ 3096433f6eSDavid Howells t1 = __kernel_inswl(x, 3); /* t1 : 000000CCDD000000 */ 3196433f6eSDavid Howells t1 |= t0; /* t1 : 000000CCDDAABBCC */ 3296433f6eSDavid Howells t2 = t1 >> 16; /* t2 : 0000000000CCDDAA */ 3396433f6eSDavid Howells t0 = t1 & 0xFF00FF00; /* t0 : 00000000DD00BB00 */ 3496433f6eSDavid Howells t3 = t2 & 0x00FF00FF; /* t3 : 0000000000CC00AA */ 3596433f6eSDavid Howells t1 = t0 + t3; /* t1 : ssssssssDDCCBBAA */ 3696433f6eSDavid Howells 3796433f6eSDavid Howells return t1; 3896433f6eSDavid Howells } 3996433f6eSDavid Howells #define __arch_swab32 __arch_swab32 4096433f6eSDavid Howells 4196433f6eSDavid Howells #endif /* __GNUC__ */ 4296433f6eSDavid Howells 4396433f6eSDavid Howells #endif /* _ALPHA_SWAB_H */ 44