Merge branch 'master' into svm

arch/x86/include/asm/string.h

@@ -35,6 +35,59 @@ void copy_page_physical(void* dest, const void * src);
 
 #ifdef HAVE_ARCH_MEMCPY
 
+#ifdef CONFIG_ROCKCREEK
+/** @brief Fast procedure to get a byte range from RAM into on-die memory.
+ *
+ * A write access, which cache line is not present, doesn't perform (on the
+ * current SCC architecture) a cache line fill. Therefore, the core writes 
+ * in this case directly to the memory. 
+ *
+ * The following function copies by prefetching its destintation. Therefore, 
+ * the  function avoids the bad behavior of a "write miss".
+ *
+ * @param dest Destination address
+ * @param src Source address
+ * @param count Range size in bytes
+ */ 
+inline static void *memcpy(void *dest, const void *src, size_t count)
+{
+	int32_t h, i, j, k, l, m;
+
+	asm volatile   ("cld;\n\t"
+			"1: cmpl $0, %%eax ; je 3f\n\t"
+			"movl (%%esi), %%ecx\n\t"
+			"movl (%%edi), %%edx\n\t"
+			"cmpl $1, %%eax ; je 2f\n\t"
+			"movl 32(%%esi), %%ecx\n\t"
+			"movl 32(%%edi), %%edx\n\t"
+			"2: movl 0(%%esi), %%ecx\n\t"
+			"movl 4(%%esi), %%edx\n\t"
+			"movl %%ecx, 0(%%edi)\n\t"
+			"movl %%edx, 4(%%edi)\n\t"
+			"movl 8(%%esi), %%ecx\n\t"
+			"movl 12(%%esi), %%edx\n\t"
+			"movl %%ecx, 8(%%edi)\n\t"
+			"movl %%edx, 12(%%edi)\n\t"
+			"movl 16(%%esi), %%ecx\n\t"
+			"movl 20(%%esi), %%edx\n\t"
+			"movl %%ecx, 16(%%edi)\n\t"
+			"movl %%edx, 20(%%edi)\n\t"
+			"movl 24(%%esi), %%ecx\n\t"
+			"movl 28(%%esi), %%edx\n\t"
+			"movl %%ecx, 24(%%edi)\n\t"
+			"movl %%edx, 28(%%edi)\n\t"
+			"addl $32, %%esi\n\t"
+			"addl $32, %%edi\n\t"
+			"dec %%eax ; jmp 1b\n\t"
+			"3: movl %%ebx, %%ecx\n\t"
+			"movl (%%edi), %%edx\n\t"
+			"andl $31, %%ecx\n\t"
+			"rep ; movsb\n\t":"=&a" (h), "=&D"(i), "=&S"(j), "=&b"(k), "=&c"(l), "=&d"(m)
+			: "0"(count / 32), "1"(dest), "2"(src), "3"(count) : "memory");
+
+        return dest;
+}
+#else
 /** @brief Copy a byte range from source to dest
  *
  * @param dest Destination address
@@ -60,6 +113,8 @@ inline static void *memcpy(void* dest, const void *src, size_t count)
 }
 #endif
 
+#endif
+
 #ifdef HAVE_ARCH_MEMSET
 
 /** @brief Repeated write of a value to a whole range of bytes

arch/x86/scc/scc_memcpy.h

@@ -85,7 +85,13 @@ inline static void *memcpy_get(void *dest, const void *src, size_t count)
 	return dest;
 }
 
-
+#if 1
+/* 
+ * In our kernel, we didn't want to use FPU registers.
+ * Therefore, we use standard memcpy routine
+ */
+#define memcpy_put 	memcpy
+#else
 /** @brief Fast procedure to get a byte range from on-die memory into RAM.
  *
  * If the destination is located on on-die memory (MPB), classical prefetching 
@@ -166,6 +172,7 @@ inline static void *memcpy_put(void *dest, const void *src, size_t count)
 
 	return dest;
 }
+#endif
 
 #endif