1 files changed, 141 insertions, 0 deletions

diff --git a/include/asm-arm/xor.h b/include/asm-arm/xor.h
new file mode 100644
index 000000000000..e7c4cf58bed1
--- /dev/null
+++ b/include/asm-arm/xor.h
@@ -0,0 +1,141 @@
+/*
+ *  linux/include/asm-arm/xor.h
+ *
+ *  Copyright (C) 2001 Russell King
+ *
+ * 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.
+ */
+#include <asm-generic/xor.h>
+
+#define __XOR(a1, a2) a1 ^= a2
+
+#define GET_BLOCK_2(dst) \
+        __asm__("ldmia  %0, {%1, %2}" \
+                : "=r" (dst), "=r" (a1), "=r" (a2) \
+                : "0" (dst))
+
+#define GET_BLOCK_4(dst) \
+        __asm__("ldmia  %0, {%1, %2, %3, %4}" \
+                : "=r" (dst), "=r" (a1), "=r" (a2), "=r" (a3), "=r" (a4) \
+                : "0" (dst))
+
+#define XOR_BLOCK_2(src) \
+        __asm__("ldmia  %0!, {%1, %2}" \
+                : "=r" (src), "=r" (b1), "=r" (b2) \
+                : "0" (src)); \
+        __XOR(a1, b1); __XOR(a2, b2);
+
+#define XOR_BLOCK_4(src) \
+        __asm__("ldmia  %0!, {%1, %2, %3, %4}" \
+                : "=r" (src), "=r" (b1), "=r" (b2), "=r" (b3), "=r" (b4) \
+                : "0" (src)); \
+        __XOR(a1, b1); __XOR(a2, b2); __XOR(a3, b3); __XOR(a4, b4)
+
+#define PUT_BLOCK_2(dst) \
+        __asm__ __volatile__("stmia     %0!, {%2, %3}" \
+                : "=r" (dst) \
+                : "0" (dst), "r" (a1), "r" (a2))
+
+#define PUT_BLOCK_4(dst) \
+        __asm__ __volatile__("stmia     %0!, {%2, %3, %4, %5}" \
+                : "=r" (dst) \
+                : "0" (dst), "r" (a1), "r" (a2), "r" (a3), "r" (a4))
+
+static void
+xor_arm4regs_2(unsigned long bytes, unsigned long *p1, unsigned long *p2)
+{
+        unsigned int lines = bytes / sizeof(unsigned long) / 4;
+        register unsigned int a1 __asm__("r4");
+        register unsigned int a2 __asm__("r5");
+        register unsigned int a3 __asm__("r6");
+        register unsigned int a4 __asm__("r7");
+        register unsigned int b1 __asm__("r8");
+        register unsigned int b2 __asm__("r9");
+        register unsigned int b3 __asm__("ip");
+        register unsigned int b4 __asm__("lr");
+
+        do {
+                GET_BLOCK_4(p1);
+                XOR_BLOCK_4(p2);
+                PUT_BLOCK_4(p1);
+        } while (--lines);
+}
+
+static void
+xor_arm4regs_3(unsigned long bytes, unsigned long *p1, unsigned long *p2,
+                unsigned long *p3)
+{
+        unsigned int lines = bytes / sizeof(unsigned long) / 4;
+        register unsigned int a1 __asm__("r4");
+        register unsigned int a2 __asm__("r5");
+        register unsigned int a3 __asm__("r6");
+        register unsigned int a4 __asm__("r7");
+        register unsigned int b1 __asm__("r8");
+        register unsigned int b2 __asm__("r9");
+        register unsigned int b3 __asm__("ip");
+        register unsigned int b4 __asm__("lr");
+
+        do {
+                GET_BLOCK_4(p1);
+                XOR_BLOCK_4(p2);
+                XOR_BLOCK_4(p3);
+                PUT_BLOCK_4(p1);
+        } while (--lines);
+}
+
+static void
+xor_arm4regs_4(unsigned long bytes, unsigned long *p1, unsigned long *p2,
+                unsigned long *p3, unsigned long *p4)
+{
+        unsigned int lines = bytes / sizeof(unsigned long) / 2;
+        register unsigned int a1 __asm__("r8");
+        register unsigned int a2 __asm__("r9");
+        register unsigned int b1 __asm__("ip");
+        register unsigned int b2 __asm__("lr");
+
+        do {
+                GET_BLOCK_2(p1);
+                XOR_BLOCK_2(p2);
+                XOR_BLOCK_2(p3);
+                XOR_BLOCK_2(p4);
+                PUT_BLOCK_2(p1);
+        } while (--lines);
+}
+
+static void
+xor_arm4regs_5(unsigned long bytes, unsigned long *p1, unsigned long *p2,
+                unsigned long *p3, unsigned long *p4, unsigned long *p5)
+{
+        unsigned int lines = bytes / sizeof(unsigned long) / 2;
+        register unsigned int a1 __asm__("r8");
+        register unsigned int a2 __asm__("r9");
+        register unsigned int b1 __asm__("ip");
+        register unsigned int b2 __asm__("lr");
+
+        do {
+                GET_BLOCK_2(p1);
+                XOR_BLOCK_2(p2);
+                XOR_BLOCK_2(p3);
+                XOR_BLOCK_2(p4);
+                XOR_BLOCK_2(p5);
+                PUT_BLOCK_2(p1);
+        } while (--lines);
+}
+
+static struct xor_block_template xor_block_arm4regs = {
+        .name   = "arm4regs",
+        .do_2   = xor_arm4regs_2,
+        .do_3   = xor_arm4regs_3,
+        .do_4   = xor_arm4regs_4,
+        .do_5   = xor_arm4regs_5,
+};
+
+#undef XOR_TRY_TEMPLATES
+#define XOR_TRY_TEMPLATES                       \
+        do {                                    \
+                xor_speed(&xor_block_arm4regs); \
+                xor_speed(&xor_block_8regs);    \
+                xor_speed(&xor_block_32regs);   \
+        } while (0)