arch/arm/include/asm/xor.h

   1 /*
   2  *  arch/arm/include/asm/xor.h
   3  *
   4  *  Copyright (C) 2001 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <asm-generic/xor.h>
  11
  12 #define __XOR(a1, a2) a1 ^= a2
  13
  14 #define GET_BLOCK_2(dst) \
  15         __asm__("ldmia  %0, {%1, %2}" \
  16                 : "=r" (dst), "=r" (a1), "=r" (a2) \
  17                 : "0" (dst))
  18
  19 #define GET_BLOCK_4(dst) \
  20         __asm__("ldmia  %0, {%1, %2, %3, %4}" \
  21                 : "=r" (dst), "=r" (a1), "=r" (a2), "=r" (a3), "=r" (a4) \
  22                 : "0" (dst))
  23
  24 #define XOR_BLOCK_2(src) \
  25         __asm__("ldmia  %0!, {%1, %2}" \
  26                 : "=r" (src), "=r" (b1), "=r" (b2) \
  27                 : "0" (src)); \
  28         __XOR(a1, b1); __XOR(a2, b2);
  29
  30 #define XOR_BLOCK_4(src) \
  31         __asm__("ldmia  %0!, {%1, %2, %3, %4}" \
  32                 : "=r" (src), "=r" (b1), "=r" (b2), "=r" (b3), "=r" (b4) \
  33                 : "0" (src)); \
  34         __XOR(a1, b1); __XOR(a2, b2); __XOR(a3, b3); __XOR(a4, b4)
  35
  36 #define PUT_BLOCK_2(dst) \
  37         __asm__ __volatile__("stmia     %0!, {%2, %3}" \
  38                 : "=r" (dst) \
  39                 : "0" (dst), "r" (a1), "r" (a2))
  40
  41 #define PUT_BLOCK_4(dst) \
  42         __asm__ __volatile__("stmia     %0!, {%2, %3, %4, %5}" \
  43                 : "=r" (dst) \
  44                 : "0" (dst), "r" (a1), "r" (a2), "r" (a3), "r" (a4))
  45
  46 static void
  47 xor_arm4regs_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
  48 {
  49         unsigned int lines = bytes / sizeof(unsigned long) / 4;
  50         register unsigned int a1 __asm__("r4");
  51         register unsigned int a2 __asm__("r5");
  52         register unsigned int a3 __asm__("r6");
  53         register unsigned int a4 __asm__("r7");
  54         register unsigned int b1 __asm__("r8");
  55         register unsigned int b2 __asm__("r9");
  56         register unsigned int b3 __asm__("ip");
  57         register unsigned int b4 __asm__("lr");
  58
  59         do {
  60                 GET_BLOCK_4(p1);
  61                 XOR_BLOCK_4(p2);
  62                 PUT_BLOCK_4(p1);
  63         } while (--lines);
  64 }
  65
  66 static void
  67 xor_arm4regs_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
  68                 unsigned long *p3)
  69 {
  70         unsigned int lines = bytes / sizeof(unsigned long) / 4;
  71         register unsigned int a1 __asm__("r4");
  72         register unsigned int a2 __asm__("r5");
  73         register unsigned int a3 __asm__("r6");
  74         register unsigned int a4 __asm__("r7");
  75         register unsigned int b1 __asm__("r8");
  76         register unsigned int b2 __asm__("r9");
  77         register unsigned int b3 __asm__("ip");
  78         register unsigned int b4 __asm__("lr");
  79
  80         do {
  81                 GET_BLOCK_4(p1);
  82                 XOR_BLOCK_4(p2);
  83                 XOR_BLOCK_4(p3);
  84                 PUT_BLOCK_4(p1);
  85         } while (--lines);
  86 }
  87
  88 static void
  89 xor_arm4regs_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
  90                 unsigned long *p3, unsigned long *p4)
  91 {
  92         unsigned int lines = bytes / sizeof(unsigned long) / 2;
  93         register unsigned int a1 __asm__("r8");
  94         register unsigned int a2 __asm__("r9");
  95         register unsigned int b1 __asm__("ip");
  96         register unsigned int b2 __asm__("lr");
  97
  98         do {
  99                 GET_BLOCK_2(p1);
 100                 XOR_BLOCK_2(p2);
 101                 XOR_BLOCK_2(p3);
 102                 XOR_BLOCK_2(p4);
 103                 PUT_BLOCK_2(p1);
 104         } while (--lines);
 105 }
 106
 107 static void
 108 xor_arm4regs_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
 109                 unsigned long *p3, unsigned long *p4, unsigned long *p5)
 110 {
 111         unsigned int lines = bytes / sizeof(unsigned long) / 2;
 112         register unsigned int a1 __asm__("r8");
 113         register unsigned int a2 __asm__("r9");
 114         register unsigned int b1 __asm__("ip");
 115         register unsigned int b2 __asm__("lr");
 116
 117         do {
 118                 GET_BLOCK_2(p1);
 119                 XOR_BLOCK_2(p2);
 120                 XOR_BLOCK_2(p3);
 121                 XOR_BLOCK_2(p4);
 122                 XOR_BLOCK_2(p5);
 123                 PUT_BLOCK_2(p1);
 124         } while (--lines);
 125 }
 126
 127 static struct xor_block_template xor_block_arm4regs = {
 128         .name   = "arm4regs",
 129         .do_2   = xor_arm4regs_2,
 130         .do_3   = xor_arm4regs_3,
 131         .do_4   = xor_arm4regs_4,
 132         .do_5   = xor_arm4regs_5,
 133 };
 134
 135 #undef XOR_TRY_TEMPLATES
 136 #define XOR_TRY_TEMPLATES                       \
 137         do {                                    \
 138                 xor_speed(&xor_block_arm4regs); \
 139                 xor_speed(&xor_block_8regs);    \
 140                 xor_speed(&xor_block_32regs);   \
 141         } while (0)