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-rw-r--r--arch/arm/include/asm/xor.h141
1 files changed, 141 insertions, 0 deletions
diff --git a/arch/arm/include/asm/xor.h b/arch/arm/include/asm/xor.h
new file mode 100644
index 00000000000..7604673dc42
--- /dev/null
+++ b/arch/arm/include/asm/xor.h
@@ -0,0 +1,141 @@
+/*
+ * arch/arm/include/asm/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)