diff options
Diffstat (limited to 'arch/arc/include/asm/swab.h')
-rw-r--r-- | arch/arc/include/asm/swab.h | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/arch/arc/include/asm/swab.h b/arch/arc/include/asm/swab.h deleted file mode 100644 index 095599a73195..000000000000 --- a/arch/arc/include/asm/swab.h +++ /dev/null @@ -1,98 +0,0 @@ -/* - * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * vineetg: May 2011 - * -Support single cycle endian-swap insn in ARC700 4.10 - * - * vineetg: June 2009 - * -Better htonl implementation (5 instead of 9 ALU instructions) - * -Hardware assisted single cycle bswap (Use Case of ARC custom instrn) - */ - -#ifndef __ASM_ARC_SWAB_H -#define __ASM_ARC_SWAB_H - -#include <linux/types.h> - -/* Native single cycle endian swap insn */ -#ifdef CONFIG_ARC_HAS_SWAPE - -#define __arch_swab32(x) \ -({ \ - unsigned int tmp = x; \ - __asm__( \ - " swape %0, %1 \n" \ - : "=r" (tmp) \ - : "r" (tmp)); \ - tmp; \ -}) - -#else - -/* Several ways of Endian-Swap Emulation for ARC - * 0: kernel generic - * 1: ARC optimised "C" - * 2: ARC Custom instruction - */ -#define ARC_BSWAP_TYPE 1 - -#if (ARC_BSWAP_TYPE == 1) /******* Software only ********/ - -/* The kernel default implementation of htonl is - * return x<<24 | x>>24 | - * (x & (__u32)0x0000ff00UL)<<8 | (x & (__u32)0x00ff0000UL)>>8; - * - * This generates 9 instructions on ARC (excluding the ld/st) - * - * 8051fd8c: ld r3,[r7,20] ; Mem op : Get the value to be swapped - * 8051fd98: asl r5,r3,24 ; get 3rd Byte - * 8051fd9c: lsr r2,r3,24 ; get 0th Byte - * 8051fda0: and r4,r3,0xff00 - * 8051fda8: asl r4,r4,8 ; get 1st Byte - * 8051fdac: and r3,r3,0x00ff0000 - * 8051fdb4: or r2,r2,r5 ; combine 0th and 3rd Bytes - * 8051fdb8: lsr r3,r3,8 ; 2nd Byte at correct place in Dst Reg - * 8051fdbc: or r2,r2,r4 ; combine 0,3 Bytes with 1st Byte - * 8051fdc0: or r2,r2,r3 ; combine 0,3,1 Bytes with 2nd Byte - * 8051fdc4: st r2,[r1,20] ; Mem op : save result back to mem - * - * Joern suggested a better "C" algorithm which is great since - * (1) It is portable to any architecure - * (2) At the same time it takes advantage of ARC ISA (rotate intrns) - */ - -#define __arch_swab32(x) \ -({ unsigned long __in = (x), __tmp; \ - __tmp = __in << 8 | __in >> 24; /* ror tmp,in,24 */ \ - __in = __in << 24 | __in >> 8; /* ror in,in,8 */ \ - __tmp ^= __in; \ - __tmp &= 0xff00ff; \ - __tmp ^ __in; \ -}) - -#elif (ARC_BSWAP_TYPE == 2) /* Custom single cycle bwap instruction */ - -#define __arch_swab32(x) \ -({ \ - unsigned int tmp = x; \ - __asm__( \ - " .extInstruction bswap, 7, 0x00, SUFFIX_NONE, SYNTAX_2OP \n"\ - " bswap %0, %1 \n"\ - : "=r" (tmp) \ - : "r" (tmp)); \ - tmp; \ -}) - -#endif /* ARC_BSWAP_TYPE=zzz */ - -#endif /* CONFIG_ARC_HAS_SWAPE */ - -#if !defined(__STRICT_ANSI__) || defined(__KERNEL__) -#define __SWAB_64_THRU_32__ -#endif - -#endif |